[RFC PATCH 2/7] arch: use asm-generic mmu context for no-op implementations

From: Nicholas Piggin
Date: Thu Jul 09 2020 - 21:57:22 EST

This patch bunches all architectures together. If the general idea is
accepted I will split them individually. Some architectures can go
further e.g., with consolidating switch_mm and activate_mm but I
only did the more obvious ones.
---
arch/alpha/include/asm/mmu_context.h | 12 ++---
arch/arc/include/asm/mmu_context.h | 16 +++----
arch/arm/include/asm/mmu_context.h | 26 ++---------
arch/arm64/include/asm/mmu_context.h | 7 ++-
arch/csky/include/asm/mmu_context.h | 8 ++--
arch/hexagon/include/asm/mmu_context.h | 33 +++-----------
arch/ia64/include/asm/mmu_context.h | 17 ++-----
arch/m68k/include/asm/mmu_context.h | 47 ++++----------------
arch/microblaze/include/asm/mmu_context_mm.h | 8 ++--
arch/microblaze/include/asm/processor.h | 3 --
arch/mips/include/asm/mmu_context.h | 11 ++---
arch/nds32/include/asm/mmu_context.h | 10 +----
arch/nios2/include/asm/mmu_context.h | 21 ++-------
arch/nios2/mm/mmu_context.c | 1 +
arch/openrisc/include/asm/mmu_context.h | 8 ++--
arch/openrisc/mm/tlb.c | 2 +
arch/parisc/include/asm/mmu_context.h | 12 ++---
arch/powerpc/include/asm/mmu_context.h | 22 +++------
arch/riscv/include/asm/mmu_context.h | 22 +--------
arch/s390/include/asm/mmu_context.h | 9 ++--
arch/sh/include/asm/mmu_context.h | 5 +--
arch/sh/include/asm/mmu_context_32.h | 9 ----
arch/sparc/include/asm/mmu_context_32.h | 10 ++---
arch/sparc/include/asm/mmu_context_64.h | 10 ++---
arch/um/include/asm/mmu_context.h | 12 +++--
arch/unicore32/include/asm/mmu_context.h | 24 ++--------
arch/x86/include/asm/mmu_context.h | 6 +++
arch/xtensa/include/asm/mmu_context.h | 11 ++---
arch/xtensa/include/asm/nommu_context.h | 26 +----------
29 files changed, 106 insertions(+), 302 deletions(-)

diff --git a/arch/alpha/include/asm/mmu_context.h b/arch/alpha/include/asm/mmu_context.h
index 6d7d9bc1b4b8..4eea7c616992 100644
--- a/arch/alpha/include/asm/mmu_context.h
+++ b/arch/alpha/include/asm/mmu_context.h
@@ -214,8 +214,6 @@ ev4_activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
tbiap();
}

-#define deactivate_mm(tsk,mm) do { } while (0)
-
#ifdef CONFIG_ALPHA_GENERIC
# define switch_mm(a,b,c) alpha_mv.mv_switch_mm((a),(b),(c))
# define activate_mm(x,y) alpha_mv.mv_activate_mm((x),(y))
@@ -229,6 +227,7 @@ ev4_activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
# endif
#endif

+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -242,12 +241,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}

-extern inline void
-destroy_context(struct mm_struct *mm)
-{
- /* Nothing to do. */
-}
-
+#define enter_lazy_tlb enter_lazy_tlb
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
@@ -255,6 +249,8 @@ enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
= ((unsigned long)mm->pgd - IDENT_ADDR) >> PAGE_SHIFT;
}

+#include <asm-generic/mmu_context.h>
+
#ifdef __MMU_EXTERN_INLINE
#undef __EXTERN_INLINE
#undef __MMU_EXTERN_INLINE
diff --git a/arch/arc/include/asm/mmu_context.h b/arch/arc/include/asm/mmu_context.h
index 3a5e6a5b9ed6..586d31902a99 100644
--- a/arch/arc/include/asm/mmu_context.h
+++ b/arch/arc/include/asm/mmu_context.h
@@ -102,6 +102,7 @@ static inline void get_new_mmu_context(struct mm_struct *mm)
* Initialize the context related info for a new mm_struct
* instance.
*/
+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -113,6 +114,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}

+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
unsigned long flags;
@@ -153,13 +155,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}

/*
- * Called at the time of execve() to get a new ASID
- * Note the subtlety here: get_new_mmu_context() behaves differently here
- * vs. in switch_mm(). Here it always returns a new ASID, because mm has
- * an unallocated "initial" value, while in latter, it moves to a new ASID,
- * only if it was unallocated
+ * activate_mm defaults to switch_mm and is called at the time of execve() to
+ * get a new ASID Note the subtlety here: get_new_mmu_context() behaves
+ * differently here vs. in switch_mm(). Here it always returns a new ASID,
+ * because mm has an unallocated "initial" value, while in latter, it moves to
+ * a new ASID, only if it was unallocated
*/
-#define activate_mm(prev, next) switch_mm(prev, next, NULL)

/* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping
* for retiring-mm. However destroy_context( ) still needs to do that because
@@ -168,8 +169,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* there is a good chance that task gets sched-out/in, making it's ASID valid
* again (this teased me for a whole day).
*/
-#define deactivate_mm(tsk, mm) do { } while (0)

-#define enter_lazy_tlb(mm, tsk)
+#include <asm-generic/mmu_context.h>

#endif /* __ASM_ARC_MMU_CONTEXT_H */
diff --git a/arch/arm/include/asm/mmu_context.h b/arch/arm/include/asm/mmu_context.h
index f99ed524fe41..84e58956fcab 100644
--- a/arch/arm/include/asm/mmu_context.h
+++ b/arch/arm/include/asm/mmu_context.h
@@ -26,6 +26,8 @@ void __check_vmalloc_seq(struct mm_struct *mm);
#ifdef CONFIG_CPU_HAS_ASID

void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk);
+
+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -92,32 +94,10 @@ static inline void finish_arch_post_lock_switch(void)

#endif /* CONFIG_MMU */

-static inline int
-init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
- return 0;
-}
-
-
#endif /* CONFIG_CPU_HAS_ASID */

-#define destroy_context(mm) do { } while(0)
#define activate_mm(prev,next) switch_mm(prev, next, NULL)

-/*
- * This is called when "tsk" is about to enter lazy TLB mode.
- *
- * mm: describes the currently active mm context
- * tsk: task which is entering lazy tlb
- * cpu: cpu number which is entering lazy tlb
- *
- * tsk->mm will be NULL
- */
-static inline void
-enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
/*
* This is the actual mm switch as far as the scheduler
* is concerned. No registers are touched. We avoid
@@ -149,6 +129,6 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
#endif
}

-#define deactivate_mm(tsk,mm) do { } while (0)
+#include <asm-generic/mmu_context.h>

#endif
diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index b0bd9b55594c..0f5e351f586a 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -174,7 +174,6 @@ static inline void cpu_replace_ttbr1(pgd_t *pgdp)
* Setting a reserved TTBR0 or EPD0 would work, but it all gets ugly when you
* take CPU migration into account.
*/
-#define destroy_context(mm) do { } while(0)
void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);

#define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.id, 0); 0; })
@@ -202,6 +201,7 @@ static inline void update_saved_ttbr0(struct task_struct *tsk,
}
#endif

+#define enter_lazy_tlb enter_lazy_tlb
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
@@ -244,12 +244,11 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
update_saved_ttbr0(tsk, next);
}

-#define deactivate_mm(tsk,mm) do { } while (0)
-#define activate_mm(prev,next) switch_mm(prev, next, current)
-
void verify_cpu_asid_bits(void);
void post_ttbr_update_workaround(void);

+#include <asm-generic/mmu_context.h>
+
#endif /* !__ASSEMBLY__ */

#endif /* !__ASM_MMU_CONTEXT_H */
diff --git a/arch/csky/include/asm/mmu_context.h b/arch/csky/include/asm/mmu_context.h
index abdf1f1cb6ec..b227d29393a8 100644
--- a/arch/csky/include/asm/mmu_context.h
+++ b/arch/csky/include/asm/mmu_context.h
@@ -24,11 +24,6 @@
#define cpu_asid(mm) (atomic64_read(&mm->context.asid) & ASID_MASK)

#define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.asid, 0); 0; })
-#define activate_mm(prev,next) switch_mm(prev, next, current)
-
-#define destroy_context(mm) do {} while (0)
-#define enter_lazy_tlb(mm, tsk) do {} while (0)
-#define deactivate_mm(tsk, mm) do {} while (0)

void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);

@@ -46,4 +41,7 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,

flush_icache_deferred(next);
}
+
+#include <asm-generic/mmu_context.h>
+
#endif /* __ASM_CSKY_MMU_CONTEXT_H */
diff --git a/arch/hexagon/include/asm/mmu_context.h b/arch/hexagon/include/asm/mmu_context.h
index cdc4adc0300a..81947764c47d 100644
--- a/arch/hexagon/include/asm/mmu_context.h
+++ b/arch/hexagon/include/asm/mmu_context.h
@@ -15,39 +15,13 @@
#include <asm/pgalloc.h>
#include <asm/mem-layout.h>

-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
/*
* VM port hides all TLB management, so "lazy TLB" isn't very
* meaningful. Even for ports to architectures with visble TLBs,
* this is almost invariably a null function.
+ *
+ * mm->context is set up by pgd_alloc, so no init_new_context required.
*/
-static inline void enter_lazy_tlb(struct mm_struct *mm,
- struct task_struct *tsk)
-{
-}
-
-/*
- * Architecture-specific actions, if any, for memory map deactivation.
- */
-static inline void deactivate_mm(struct task_struct *tsk,
- struct mm_struct *mm)
-{
-}
-
-/**
- * init_new_context - initialize context related info for new mm_struct instance
- * @tsk: pointer to a task struct
- * @mm: pointer to a new mm struct
- */
-static inline int init_new_context(struct task_struct *tsk,
- struct mm_struct *mm)
-{
- /* mm->context is set up by pgd_alloc */
- return 0;
-}

/*
* Switch active mm context
@@ -74,6 +48,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
/*
* Activate new memory map for task
*/
+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
unsigned long flags;
@@ -86,4 +61,6 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
/* Generic hooks for arch_dup_mmap and arch_exit_mmap */
#include <asm-generic/mm_hooks.h>

+#include <asm-generic/mmu_context.h>
+
#endif
diff --git a/arch/ia64/include/asm/mmu_context.h b/arch/ia64/include/asm/mmu_context.h
index 2da0e2eb036b..87a0d5bc11ef 100644
--- a/arch/ia64/include/asm/mmu_context.h
+++ b/arch/ia64/include/asm/mmu_context.h
@@ -49,11 +49,6 @@ DECLARE_PER_CPU(u8, ia64_need_tlb_flush);
extern void mmu_context_init (void);
extern void wrap_mmu_context (struct mm_struct *mm);

-static inline void
-enter_lazy_tlb (struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
/*
* When the context counter wraps around all TLBs need to be flushed because
* an old context number might have been reused. This is signalled by the
@@ -116,6 +111,7 @@ get_mmu_context (struct mm_struct *mm)
* Initialize context number to some sane value. MM is guaranteed to be a
* brand-new address-space, so no TLB flushing is needed, ever.
*/
+#define init_new_context init_new_context
static inline int
init_new_context (struct task_struct *p, struct mm_struct *mm)
{
@@ -123,12 +119,6 @@ init_new_context (struct task_struct *p, struct mm_struct *mm)
return 0;
}

-static inline void
-destroy_context (struct mm_struct *mm)
-{
- /* Nothing to do. */
-}
-
static inline void
reload_context (nv_mm_context_t context)
{
@@ -178,11 +168,10 @@ activate_context (struct mm_struct *mm)
} while (unlikely(context != mm->context));
}

-#define deactivate_mm(tsk,mm) do { } while (0)
-
/*
* Switch from address space PREV to address space NEXT.
*/
+#define activate_mm activate_mm
static inline void
activate_mm (struct mm_struct *prev, struct mm_struct *next)
{
@@ -196,5 +185,7 @@ activate_mm (struct mm_struct *prev, struct mm_struct *next)

#define switch_mm(prev_mm,next_mm,next_task) activate_mm(prev_mm, next_mm)

+#include <asm-generic/mmu_context.h>
+
# endif /* ! __ASSEMBLY__ */
#endif /* _ASM_IA64_MMU_CONTEXT_H */
diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
index cac9f289d1f6..56ae27322178 100644
--- a/arch/m68k/include/asm/mmu_context.h
+++ b/arch/m68k/include/asm/mmu_context.h
@@ -5,10 +5,6 @@
#include <asm-generic/mm_hooks.h>
#include <linux/mm_types.h>

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
#ifdef CONFIG_MMU

#if defined(CONFIG_COLDFIRE)
@@ -58,6 +54,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
/*
* We're finished using the context for an address space.
*/
+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
if (mm->context != NO_CONTEXT) {
@@ -79,19 +76,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
set_context(tsk->mm->context, next->pgd);
}

-/*
- * After we have set current->mm to a new value, this activates
- * the context for the new mm so we see the new mappings.
- */
-static inline void activate_mm(struct mm_struct *active_mm,
- struct mm_struct *mm)
-{
- get_mmu_context(mm);
- set_context(mm->context, mm->pgd);
-}
-
-#define deactivate_mm(tsk, mm) do { } while (0)
-
#define prepare_arch_switch(next) load_ksp_mmu(next)

static inline void load_ksp_mmu(struct task_struct *task)
@@ -176,6 +160,7 @@ extern unsigned long get_free_context(struct mm_struct *mm);
extern void clear_context(unsigned long context);

/* set the context for a new task to unmapped */
+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -210,8 +195,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
activate_context(tsk->mm);
}

-#define deactivate_mm(tsk, mm) do { } while (0)
-
+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
@@ -224,6 +208,7 @@ static inline void activate_mm(struct mm_struct *prev_mm,
#include <asm/page.h>
#include <asm/pgalloc.h>

+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -231,8 +216,6 @@ static inline int init_new_context(struct task_struct *tsk,
return 0;
}

-#define destroy_context(mm) do { } while(0)
-
static inline void switch_mm_0230(struct mm_struct *mm)
{
unsigned long crp[2] = {
@@ -300,8 +283,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, str
}
}

-#define deactivate_mm(tsk,mm) do { } while (0)
-
+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
@@ -315,24 +297,11 @@ static inline void activate_mm(struct mm_struct *prev_mm,

#endif

-#else /* !CONFIG_MMU */
+#include <asm-generic/mmu_context.h>

-static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
-{
- return 0;
-}
-
-
-static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
-{
-}
-
-#define destroy_context(mm) do { } while (0)
-#define deactivate_mm(tsk,mm) do { } while (0)
+#else /* !CONFIG_MMU */

-static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
-{
-}
+#include <asm-generic/nommu_context.h>

#endif /* CONFIG_MMU */
#endif /* __M68K_MMU_CONTEXT_H */
diff --git a/arch/microblaze/include/asm/mmu_context_mm.h b/arch/microblaze/include/asm/mmu_context_mm.h
index a1c7dd48454c..c2c77f708455 100644
--- a/arch/microblaze/include/asm/mmu_context_mm.h
+++ b/arch/microblaze/include/asm/mmu_context_mm.h
@@ -33,10 +33,6 @@
to represent all kernel pages as shared among all contexts.
*/

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
# define NO_CONTEXT 256
# define LAST_CONTEXT 255
# define FIRST_CONTEXT 1
@@ -105,6 +101,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
/*
* We're finished using the context for an address space.
*/
+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
if (mm->context != NO_CONTEXT) {
@@ -126,6 +123,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *active_mm,
struct mm_struct *mm)
{
@@ -136,5 +134,7 @@ static inline void activate_mm(struct mm_struct *active_mm,

extern void mmu_context_init(void);

+#include <asm-generic/mmu_context.h>
+
# endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 1ff5a82b76b6..616211871a6e 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -122,9 +122,6 @@ unsigned long get_wchan(struct task_struct *p);
# define KSTK_EIP(task) (task_pc(task))
# define KSTK_ESP(task) (task_sp(task))

-/* FIXME */
-# define deactivate_mm(tsk, mm) do { } while (0)
-
# define STACK_TOP TASK_SIZE
# define STACK_TOP_MAX STACK_TOP

diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mmu_context.h
index cddead91acd4..ed9f2d748f63 100644
--- a/arch/mips/include/asm/mmu_context.h
+++ b/arch/mips/include/asm/mmu_context.h
@@ -124,10 +124,6 @@ static inline void set_cpu_context(unsigned int cpu,
#define cpu_asid(cpu, mm) \
(cpu_context((cpu), (mm)) & cpu_asid_mask(&cpu_data[cpu]))

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
extern void get_new_mmu_context(struct mm_struct *mm);
extern void check_mmu_context(struct mm_struct *mm);
extern void check_switch_mmu_context(struct mm_struct *mm);
@@ -136,6 +132,7 @@ extern void check_switch_mmu_context(struct mm_struct *mm);
* Initialize the context related info for a new mm_struct
* instance.
*/
+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -180,14 +177,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* Destroy context related info for an mm_struct that is about
* to be put to rest.
*/
+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
dsemul_mm_cleanup(mm);
}

-#define activate_mm(prev, next) switch_mm(prev, next, current)
-#define deactivate_mm(tsk, mm) do { } while (0)
-
static inline void
drop_mmu_context(struct mm_struct *mm)
{
@@ -237,4 +232,6 @@ drop_mmu_context(struct mm_struct *mm)
local_irq_restore(flags);
}

+#include <asm-generic/mmu_context.h>
+
#endif /* _ASM_MMU_CONTEXT_H */
diff --git a/arch/nds32/include/asm/mmu_context.h b/arch/nds32/include/asm/mmu_context.h
index b8fd3d189fdc..c651bc8cacdc 100644
--- a/arch/nds32/include/asm/mmu_context.h
+++ b/arch/nds32/include/asm/mmu_context.h
@@ -9,6 +9,7 @@
#include <asm/proc-fns.h>
#include <asm-generic/mm_hooks.h>

+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -16,8 +17,6 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}

-#define destroy_context(mm) do { } while(0)
-
#define CID_BITS 9
extern spinlock_t cid_lock;
extern unsigned int cpu_last_cid;
@@ -47,10 +46,6 @@ static inline void check_context(struct mm_struct *mm)
__new_context(mm);
}

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
@@ -62,7 +57,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
}

-#define deactivate_mm(tsk,mm) do { } while (0)
-#define activate_mm(prev,next) switch_mm(prev, next, NULL)
+#include <asm-generic/mmu_context.h>

#endif
diff --git a/arch/nios2/include/asm/mmu_context.h b/arch/nios2/include/asm/mmu_context.h
index 78ab3dacf579..4f99ed09b5a7 100644
--- a/arch/nios2/include/asm/mmu_context.h
+++ b/arch/nios2/include/asm/mmu_context.h
@@ -26,16 +26,13 @@ extern unsigned long get_pid_from_context(mm_context_t *ctx);
*/
extern pgd_t *pgd_current;

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
/*
* Initialize the context related info for a new mm_struct instance.
*
* Set all new contexts to 0, that way the generation will never match
* the currently running generation when this context is switched in.
*/
+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -43,26 +40,16 @@ static inline int init_new_context(struct task_struct *tsk,
return 0;
}

-/*
- * Destroy context related info for an mm_struct that is about
- * to be put to rest.
- */
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk);

-static inline void deactivate_mm(struct task_struct *tsk,
- struct mm_struct *mm)
-{
-}
-
/*
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
+#define activate_mm activate_mm
void activate_mm(struct mm_struct *prev, struct mm_struct *next);

+#include <asm-generic/mmu_context.h>
+
#endif /* _ASM_NIOS2_MMU_CONTEXT_H */
diff --git a/arch/nios2/mm/mmu_context.c b/arch/nios2/mm/mmu_context.c
index 45d6b9c58d67..d77aa542deb2 100644
--- a/arch/nios2/mm/mmu_context.c
+++ b/arch/nios2/mm/mmu_context.c
@@ -103,6 +103,7 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
+#define activate_mm activate_mm
void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
next->context = get_new_context();
diff --git a/arch/openrisc/include/asm/mmu_context.h b/arch/openrisc/include/asm/mmu_context.h
index ced577542e29..a6702384c77d 100644
--- a/arch/openrisc/include/asm/mmu_context.h
+++ b/arch/openrisc/include/asm/mmu_context.h
@@ -17,13 +17,13 @@

#include <asm-generic/mm_hooks.h>

+#define init_new_context init_new_context
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);
extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk);

-#define deactivate_mm(tsk, mm) do { } while (0)
-
#define activate_mm(prev, next) switch_mm((prev), (next), NULL)

/* current active pgd - this is similar to other processors pgd
@@ -32,8 +32,6 @@ extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,

extern volatile pgd_t *current_pgd[]; /* defined in arch/openrisc/mm/fault.c */

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
+#include <asm-generic/mmu_context.h>

#endif
diff --git a/arch/openrisc/mm/tlb.c b/arch/openrisc/mm/tlb.c
index 4b680aed8f5f..821aab4cf3be 100644
--- a/arch/openrisc/mm/tlb.c
+++ b/arch/openrisc/mm/tlb.c
@@ -159,6 +159,7 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* instance.
*/

+#define init_new_context init_new_context
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
mm->context = NO_CONTEXT;
@@ -170,6 +171,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
* drops it.
*/

+#define destroy_context destroy_context
void destroy_context(struct mm_struct *mm)
{
flush_tlb_mm(mm);
diff --git a/arch/parisc/include/asm/mmu_context.h b/arch/parisc/include/asm/mmu_context.h
index 07b89c74abeb..71f8a3679b83 100644
--- a/arch/parisc/include/asm/mmu_context.h
+++ b/arch/parisc/include/asm/mmu_context.h
@@ -8,16 +8,13 @@
#include <asm/pgalloc.h>
#include <asm-generic/mm_hooks.h>

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
/* on PA-RISC, we actually have enough contexts to justify an allocator
* for them. prumpf */

extern unsigned long alloc_sid(void);
extern void free_sid(unsigned long);

+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -27,6 +24,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}

+#define destroy_context destroy_context
static inline void
destroy_context(struct mm_struct *mm)
{
@@ -72,8 +70,7 @@ static inline void switch_mm(struct mm_struct *prev,
}
#define switch_mm_irqs_off switch_mm_irqs_off

-#define deactivate_mm(tsk,mm) do { } while (0)
-
+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
/*
@@ -91,4 +88,7 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)

switch_mm(prev,next,current);
}
+
+#include <asm-generic/mmu_context.h>
+
#endif
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 1a474f6b1992..242bd987247b 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -14,7 +14,9 @@
/*
* Most if the context management is out of line
*/
+#define init_new_context init_new_context
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
struct mm_iommu_table_group_mem_t;
@@ -237,27 +239,15 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
#define switch_mm_irqs_off switch_mm_irqs_off

-
-#define deactivate_mm(tsk,mm) do { } while (0)
-
-/*
- * After we have set current->mm to a new value, this activates
- * the context for the new mm so we see the new mappings.
- */
-static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
- switch_mm(prev, next, current);
-}
-
-/* We don't currently use enter_lazy_tlb() for anything */
+#ifdef CONFIG_PPC_BOOK3E_64
+#define enter_lazy_tlb enter_lazy_tlb
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
/* 64-bit Book3E keeps track of current PGD in the PACA */
-#ifdef CONFIG_PPC_BOOK3E_64
get_paca()->pgd = NULL;
-#endif
}
+#endif

extern void arch_exit_mmap(struct mm_struct *mm);

@@ -300,5 +290,7 @@ static inline int arch_dup_mmap(struct mm_struct *oldmm,
return 0;
}

+#include <asm-generic/mmu_context.h>
+
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
diff --git a/arch/riscv/include/asm/mmu_context.h b/arch/riscv/include/asm/mmu_context.h
index 67c463812e2d..250defa06f3a 100644
--- a/arch/riscv/include/asm/mmu_context.h
+++ b/arch/riscv/include/asm/mmu_context.h
@@ -13,34 +13,16 @@
#include <linux/mm.h>
#include <linux/sched.h>

-static inline void enter_lazy_tlb(struct mm_struct *mm,
- struct task_struct *task)
-{
-}
-
-/* Initialize context-related info for a new mm_struct */
-static inline int init_new_context(struct task_struct *task,
- struct mm_struct *mm)
-{
- return 0;
-}
-
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *task);

+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev,
struct mm_struct *next)
{
switch_mm(prev, next, NULL);
}

-static inline void deactivate_mm(struct task_struct *task,
- struct mm_struct *mm)
-{
-}
+#include <asm-generic/mmu_context.h>

#endif /* _ASM_RISCV_MMU_CONTEXT_H */
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index c9f3d8a52756..66f9cf0a07e3 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -15,6 +15,7 @@
#include <asm/ctl_reg.h>
#include <asm-generic/mm_hooks.h>

+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -69,8 +70,6 @@ static inline int init_new_context(struct task_struct *tsk,
return 0;
}

-#define destroy_context(mm) do { } while (0)
-
static inline void set_user_asce(struct mm_struct *mm)
{
S390_lowcore.user_asce = mm->context.asce;
@@ -125,9 +124,7 @@ static inline void finish_arch_post_lock_switch(void)
set_fs(current->thread.mm_segment);
}

-#define enter_lazy_tlb(mm,tsk) do { } while (0)
-#define deactivate_mm(tsk,mm) do { } while (0)
-
+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev,
struct mm_struct *next)
{
@@ -136,4 +133,6 @@ static inline void activate_mm(struct mm_struct *prev,
set_user_asce(next);
}

+#include <asm-generic/mmu_context.h>
+
#endif /* __S390_MMU_CONTEXT_H */
diff --git a/arch/sh/include/asm/mmu_context.h b/arch/sh/include/asm/mmu_context.h
index 9470d17c71c2..ce40147d4a7d 100644
--- a/arch/sh/include/asm/mmu_context.h
+++ b/arch/sh/include/asm/mmu_context.h
@@ -85,6 +85,7 @@ static inline void get_mmu_context(struct mm_struct *mm, unsigned int cpu)
* Initialize the context related info for a new mm_struct
* instance.
*/
+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -121,9 +122,7 @@ static inline void switch_mm(struct mm_struct *prev,
activate_context(next, cpu);
}

-#define activate_mm(prev, next) switch_mm((prev),(next),NULL)
-#define deactivate_mm(tsk,mm) do { } while (0)
-#define enter_lazy_tlb(mm,tsk) do { } while (0)
+#include <asm-generic/mmu_context.h>

#else

diff --git a/arch/sh/include/asm/mmu_context_32.h b/arch/sh/include/asm/mmu_context_32.h
index 71bf12ef1f65..bc5034fa6249 100644
--- a/arch/sh/include/asm/mmu_context_32.h
+++ b/arch/sh/include/asm/mmu_context_32.h
@@ -2,15 +2,6 @@
#ifndef __ASM_SH_MMU_CONTEXT_32_H
#define __ASM_SH_MMU_CONTEXT_32_H

-/*
- * Destroy context related info for an mm_struct that is about
- * to be put to rest.
- */
-static inline void destroy_context(struct mm_struct *mm)
-{
- /* Do nothing */
-}
-
#ifdef CONFIG_CPU_HAS_PTEAEX
static inline void set_asid(unsigned long asid)
{
diff --git a/arch/sparc/include/asm/mmu_context_32.h b/arch/sparc/include/asm/mmu_context_32.h
index 7ddcb8badf70..509043f81560 100644
--- a/arch/sparc/include/asm/mmu_context_32.h
+++ b/arch/sparc/include/asm/mmu_context_32.h
@@ -6,13 +6,10 @@

#include <asm-generic/mm_hooks.h>

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
/* Initialize a new mmu context. This is invoked when a new
* address space instance (unique or shared) is instantiated.
*/
+#define init_new_context init_new_context
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);

/* Destroy a dead context. This occurs when mmput drops the
@@ -20,17 +17,18 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
* all the page tables have been flushed. Our job is to destroy
* any remaining processor-specific state.
*/
+#define destroy_context destroy_context
void destroy_context(struct mm_struct *mm);

/* Switch the current MM context. */
void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm,
struct task_struct *tsk);

-#define deactivate_mm(tsk,mm) do { } while (0)
-
/* Activate a new MM instance for the current task. */
#define activate_mm(active_mm, mm) switch_mm((active_mm), (mm), NULL)

+#include <asm-generic/mmu_context.h>
+
#endif /* !(__ASSEMBLY__) */

#endif /* !(__SPARC_MMU_CONTEXT_H) */
diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h
index 312fcee8df2b..7a8380c63aab 100644
--- a/arch/sparc/include/asm/mmu_context_64.h
+++ b/arch/sparc/include/asm/mmu_context_64.h
@@ -16,17 +16,16 @@
#include <asm-generic/mm_hooks.h>
#include <asm/percpu.h>

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
extern spinlock_t ctx_alloc_lock;
extern unsigned long tlb_context_cache;
extern unsigned long mmu_context_bmap[];

DECLARE_PER_CPU(struct mm_struct *, per_cpu_secondary_mm);
void get_new_mmu_context(struct mm_struct *mm);
+
+#define init_new_context init_new_context
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+#define destroy_context destroy_context
void destroy_context(struct mm_struct *mm);

void __tsb_context_switch(unsigned long pgd_pa,
@@ -136,7 +135,6 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str
spin_unlock_irqrestore(&mm->context.lock, flags);
}

-#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm(active_mm, mm) switch_mm(active_mm, mm, NULL)

#define __HAVE_ARCH_START_CONTEXT_SWITCH
@@ -187,6 +185,8 @@ static inline void finish_arch_post_lock_switch(void)
}
}

+#include <asm-generic/mmu_context.h>
+
#endif /* !(__ASSEMBLY__) */

#endif /* !(__SPARC64_MMU_CONTEXT_H) */
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 17ddd4edf875..f8a100770691 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -37,10 +37,9 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
* end asm-generic/mm_hooks.h functions
*/

-#define deactivate_mm(tsk,mm) do { } while (0)
-
extern void force_flush_all(void);

+#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
{
/*
@@ -66,13 +65,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
}

-static inline void enter_lazy_tlb(struct mm_struct *mm,
- struct task_struct *tsk)
-{
-}
-
+#define init_new_context init_new_context
extern int init_new_context(struct task_struct *task, struct mm_struct *mm);

+#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);

+#include <asm-generic/mmu_context.h>
+
#endif
diff --git a/arch/unicore32/include/asm/mmu_context.h b/arch/unicore32/include/asm/mmu_context.h
index 388c0c811c68..e1751cb5439c 100644
--- a/arch/unicore32/include/asm/mmu_context.h
+++ b/arch/unicore32/include/asm/mmu_context.h
@@ -18,24 +18,6 @@
#include <asm/cacheflush.h>
#include <asm/cpu-single.h>

-#define init_new_context(tsk, mm) 0
-
-#define destroy_context(mm) do { } while (0)
-
-/*
- * This is called when "tsk" is about to enter lazy TLB mode.
- *
- * mm: describes the currently active mm context
- * tsk: task which is entering lazy tlb
- * cpu: cpu number which is entering lazy tlb
- *
- * tsk->mm will be NULL
- */
-static inline void
-enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
/*
* This is the actual mm switch as far as the scheduler
* is concerned. No registers are touched. We avoid
@@ -52,9 +34,6 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
cpu_switch_mm(next->pgd, next);
}

-#define deactivate_mm(tsk, mm) do { } while (0)
-#define activate_mm(prev, next) switch_mm(prev, next, NULL)
-
/*
* We are inserting a "fake" vma for the user-accessible vector page so
* gdb and friends can get to it through ptrace and /proc/<pid>/mem.
@@ -95,4 +74,7 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
/* by default, allow everything */
return true;
}
+
+#include <asm-generic/mmu_context.h>
+
#endif
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index 47562147e70b..255750548433 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -92,12 +92,14 @@ static inline void switch_ldt(struct mm_struct *prev, struct mm_struct *next)
}
#endif

+#define enter_lazy_tlb enter_lazy_tlb
extern void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);

/*
* Init a new mm. Used on mm copies, like at fork()
* and on mm's that are brand-new, like at execve().
*/
+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -117,6 +119,8 @@ static inline int init_new_context(struct task_struct *tsk,
init_new_context_ldt(mm);
return 0;
}
+
+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
destroy_context_ldt(mm);
@@ -215,4 +219,6 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,

unsigned long __get_current_cr3_fast(void);

+#include <asm-generic/mmu_context.h>
+
#endif /* _ASM_X86_MMU_CONTEXT_H */
diff --git a/arch/xtensa/include/asm/mmu_context.h b/arch/xtensa/include/asm/mmu_context.h
index 74923ef3b228..e337ba9686e9 100644
--- a/arch/xtensa/include/asm/mmu_context.h
+++ b/arch/xtensa/include/asm/mmu_context.h
@@ -111,6 +111,7 @@ static inline void activate_context(struct mm_struct *mm, unsigned int cpu)
* to -1 says the process has never run on any core.
*/

+#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@@ -136,24 +137,18 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
activate_context(next, cpu);
}

-#define activate_mm(prev, next) switch_mm((prev), (next), NULL)
-#define deactivate_mm(tsk, mm) do { } while (0)
-
/*
* Destroy context related info for an mm_struct that is about
* to be put to rest.
*/
+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
invalidate_page_directory();
}


-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
- /* Nothing to do. */
-
-}
+#include <asm-generic/mmu_context.h>

#endif /* CONFIG_MMU */
#endif /* _XTENSA_MMU_CONTEXT_H */
diff --git a/arch/xtensa/include/asm/nommu_context.h b/arch/xtensa/include/asm/nommu_context.h
index 37251b2ef871..7c9d1918dc41 100644
--- a/arch/xtensa/include/asm/nommu_context.h
+++ b/arch/xtensa/include/asm/nommu_context.h
@@ -7,28 +7,4 @@ static inline void init_kio(void)
{
}

-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
-static inline int init_new_context(struct task_struct *tsk,struct mm_struct *mm)
-{
- return 0;
-}
-
-static inline void destroy_context(struct mm_struct *mm)
-{
-}
-
-static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
-}
-
-static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
- struct task_struct *tsk)
-{
-}
-
-static inline void deactivate_mm(struct task_struct *tsk, struct mm_struct *mm)
-{
-}
+#include <asm-generic/nommu_context.h>
--
2.23.0