[PATCH V1 09/10] arch/kmap: Define kmap_atomic_prot() for all arch's

From: ira . weiny
Date: Thu Apr 30 2020 - 16:39:08 EST

From: Ira Weiny <ira.weiny@xxxxxxxxx>

To support kmap_atomic_prot(), all architectures need to support
protections passed to their kmap_atomic_high() function. Pass
protections into kmap_atomic_high() and change the name to
kmap_atomic_high_prot() to match.

Then define kmap_atomic_prot() as a core function which calls
kmap_atomic_high_prot() when needed.

Finally, redefine kmap_atomic() as a wrapper of kmap_atomic_prot() with
the default kmap_prot exported by the architectures.

Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
arch/arc/include/asm/highmem.h | 2 +-
arch/arc/mm/highmem.c | 6 +++---
arch/arm/include/asm/highmem.h | 2 +-
arch/arm/mm/highmem.c | 6 +++---
arch/csky/include/asm/highmem.h | 2 +-
arch/csky/mm/highmem.c | 6 +++---
arch/microblaze/include/asm/highmem.h | 7 +------
arch/microblaze/mm/highmem.c | 4 ++--
arch/mips/include/asm/highmem.h | 2 +-
arch/mips/mm/highmem.c | 6 +++---
arch/nds32/include/asm/highmem.h | 2 +-
arch/nds32/mm/highmem.c | 6 +++---
arch/powerpc/include/asm/highmem.h | 8 +-------
arch/powerpc/mm/highmem.c | 4 ++--
arch/sparc/include/asm/highmem.h | 2 +-
arch/sparc/mm/highmem.c | 6 +++---
arch/x86/include/asm/highmem.h | 6 +-----
arch/x86/mm/highmem_32.c | 4 ++--
arch/xtensa/include/asm/highmem.h | 2 +-
arch/xtensa/mm/highmem.c | 6 +++---
include/linux/highmem.h | 5 +++--
21 files changed, 40 insertions(+), 54 deletions(-)

diff --git a/arch/arc/include/asm/highmem.h b/arch/arc/include/asm/highmem.h
index e16531495620..09f86bde6809 100644
--- a/arch/arc/include/asm/highmem.h
+++ b/arch/arc/include/asm/highmem.h
@@ -30,7 +30,7 @@

#include <asm/cacheflush.h>

-extern void *kmap_atomic_high(struct page *page);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);

extern void kmap_init(void);
diff --git a/arch/arc/mm/highmem.c b/arch/arc/mm/highmem.c
index 5d3eab4ac0b0..479b0d72d3cf 100644
--- a/arch/arc/mm/highmem.c
+++ b/arch/arc/mm/highmem.c
@@ -49,7 +49,7 @@
extern pte_t * pkmap_page_table;
static pte_t * fixmap_page_table;

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
int idx, cpu_idx;
unsigned long vaddr;
@@ -59,11 +59,11 @@ void *kmap_atomic_high(struct page *page)
vaddr = FIXMAP_ADDR(idx);

set_pte_at(&init_mm, vaddr, fixmap_page_table + idx,
- mk_pte(page, kmap_prot));
+ mk_pte(page, prot));

return (void *)vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kv)
{
diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h
index a9d5e9bce1cc..e35f2f73f6aa 100644
--- a/arch/arm/include/asm/highmem.h
+++ b/arch/arm/include/asm/highmem.h
@@ -60,7 +60,7 @@ static inline void *kmap_high_get(struct page *page)
* when CONFIG_HIGHMEM is not set.
*/
#ifdef CONFIG_HIGHMEM
-extern void *kmap_atomic_high(struct page *page);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);
extern void *kmap_atomic_pfn(unsigned long pfn);
#endif
diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c
index ac8394655a6e..e013f6b81328 100644
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -31,7 +31,7 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr)
return *ptep;
}

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned int idx;
unsigned long vaddr;
@@ -67,11 +67,11 @@ void *kmap_atomic_high(struct page *page)
* in place, so the contained TLB flush ensures the TLB is updated
* with the new mapping.
*/
- set_fixmap_pte(idx, mk_pte(page, kmap_prot));
+ set_fixmap_pte(idx, mk_pte(page, prot));

return (void *)vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h
index 5bbbe59e60a9..59854c7ccf78 100644
--- a/arch/csky/include/asm/highmem.h
+++ b/arch/csky/include/asm/highmem.h
@@ -32,7 +32,7 @@ extern pte_t *pkmap_page_table;

#define ARCH_HAS_KMAP_FLUSH_TLB
extern void kmap_flush_tlb(unsigned long addr);
-extern void *kmap_atomic_high(struct page *page);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);
extern void *kmap_atomic_pfn(unsigned long pfn);
extern struct page *kmap_atomic_to_page(void *ptr);
diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c
index f4311669b5bb..3ae5c8cd7619 100644
--- a/arch/csky/mm/highmem.c
+++ b/arch/csky/mm/highmem.c
@@ -21,7 +21,7 @@ EXPORT_SYMBOL(kmap_flush_tlb);

EXPORT_SYMBOL(kmap);

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;
@@ -32,12 +32,12 @@ void *kmap_atomic_high(struct page *page)
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte - idx)));
#endif
- set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+ set_pte(kmap_pte-idx, mk_pte(page, prot));
flush_tlb_one((unsigned long)vaddr);

return (void *)vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h
index 66521fdc3a47..eb0a2cb883bd 100644
--- a/arch/microblaze/include/asm/highmem.h
+++ b/arch/microblaze/include/asm/highmem.h
@@ -51,14 +51,9 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))

-extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);

-static inline void *kmap_atomic_high(struct page *page)
-{
- return kmap_atomic_prot(page, kmap_prot);
-}
-
#define flush_cache_kmaps() { flush_icache(); flush_dcache(); }

#endif /* __KERNEL__ */
diff --git a/arch/microblaze/mm/highmem.c b/arch/microblaze/mm/highmem.c
index 1026aeffe11a..ee8a422b2b76 100644
--- a/arch/microblaze/mm/highmem.c
+++ b/arch/microblaze/mm/highmem.c
@@ -32,7 +32,7 @@
*/
#include <asm/tlbflush.h>

-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{

unsigned long vaddr;
@@ -49,7 +49,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return (void *) vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_prot);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h
index d9f774bd4938..c9f46b450a68 100644
--- a/arch/mips/include/asm/highmem.h
+++ b/arch/mips/include/asm/highmem.h
@@ -48,7 +48,7 @@ extern pte_t *pkmap_page_table;

#define ARCH_HAS_KMAP_FLUSH_TLB
extern void kmap_flush_tlb(unsigned long addr);
-extern void *kmap_atomic_high(struct page *page);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);
extern void *kmap_atomic_pfn(unsigned long pfn);

diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index 87023bd1a33c..37e244cdb14e 100644
--- a/arch/mips/mm/highmem.c
+++ b/arch/mips/mm/highmem.c
@@ -18,7 +18,7 @@ void kmap_flush_tlb(unsigned long addr)
}
EXPORT_SYMBOL(kmap_flush_tlb);

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;
@@ -29,12 +29,12 @@ void *kmap_atomic_high(struct page *page)
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte - idx)));
#endif
- set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+ set_pte(kmap_pte-idx, mk_pte(page, prot));
local_flush_tlb_one((unsigned long)vaddr);

return (void*) vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h
index 97648b678108..1f9fc74d112d 100644
--- a/arch/nds32/include/asm/highmem.h
+++ b/arch/nds32/include/asm/highmem.h
@@ -51,7 +51,7 @@ extern void kmap_init(void);
* when CONFIG_HIGHMEM is not set.
*/
#ifdef CONFIG_HIGHMEM
-extern void *kmap_atomic_high(struct page *page);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);
extern void *kmap_atomic_pfn(unsigned long pfn);
extern struct page *kmap_atomic_to_page(void *ptr);
diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c
index 809f8c830f06..63ded527c1e8 100644
--- a/arch/nds32/mm/highmem.c
+++ b/arch/nds32/mm/highmem.c
@@ -10,7 +10,7 @@
#include <asm/fixmap.h>
#include <asm/tlbflush.h>

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned int idx;
unsigned long vaddr, pte;
@@ -21,7 +21,7 @@ void *kmap_atomic_high(struct page *page)

idx = type + KM_TYPE_NR * smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
- pte = (page_to_pfn(page) << PAGE_SHIFT) | (kmap_prot);
+ pte = (page_to_pfn(page) << PAGE_SHIFT) | prot;
ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
set_pte(ptep, pte);

@@ -32,7 +32,7 @@ void *kmap_atomic_high(struct page *page)
return (void *)vaddr;
}

-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index d264aebcaa9b..edd01bbe5a44 100644
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -59,15 +59,9 @@ extern pte_t *pkmap_page_table;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))

-extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
extern void kunmap_atomic_high(void *kvaddr);

-static inline void *kmap_atomic_high(struct page *page)
-{
- return kmap_atomic_prot(page, kmap_prot);
-}
-
-
#define flush_cache_kmaps() flush_cache_all()

#endif /* __KERNEL__ */
diff --git a/arch/powerpc/mm/highmem.c b/arch/powerpc/mm/highmem.c
index 162958321e28..35071c2913f1 100644
--- a/arch/powerpc/mm/highmem.c
+++ b/arch/powerpc/mm/highmem.c
@@ -24,7 +24,7 @@
#include <linux/highmem.h>
#include <linux/module.h>

-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;
@@ -38,7 +38,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return (void*) vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_prot);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h
index 94dd6e4c5fa4..d5c5700672de 100644
--- a/arch/sparc/include/asm/highmem.h
+++ b/arch/sparc/include/asm/highmem.h
@@ -50,7 +50,7 @@ void kmap_init(void) __init;

#define PKMAP_END (PKMAP_ADDR(LAST_PKMAP))

-void *kmap_atomic_high(struct page *page);
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
void kunmap_atomic_high(void *kvaddr);

#define flush_cache_kmaps() flush_cache_all()
diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c
index 9f06d75e88e1..414f578d1e57 100644
--- a/arch/sparc/mm/highmem.c
+++ b/arch/sparc/mm/highmem.c
@@ -54,7 +54,7 @@ void __init kmap_init(void)
kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
}

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
long idx, type;
@@ -73,7 +73,7 @@ void *kmap_atomic_high(struct page *page)
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte-idx)));
#endif
- set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+ set_pte(kmap_pte-idx, mk_pte(page, prot));
/* XXX Fix - Anton */
#if 0
__flush_tlb_one(vaddr);
@@ -83,7 +83,7 @@ void *kmap_atomic_high(struct page *page)

return (void*) vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h
index ff87aba96eee..009b8e22e906 100644
--- a/arch/x86/include/asm/highmem.h
+++ b/arch/x86/include/asm/highmem.h
@@ -58,11 +58,7 @@ extern unsigned long highstart_pfn, highend_pfn;
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))

-extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
-void *kmap_atomic_high(struct page *page)
-{
- return kmap_atomic_prot(page, kmap_prot);
-}
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
void kunmap_atomic_high(void *kvaddr);
void *kmap_atomic_pfn(unsigned long pfn);
void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index af07a6842743..075fe51317b0 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -4,7 +4,7 @@
#include <linux/swap.h> /* for totalram_pages */
#include <linux/memblock.h>

-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;
@@ -18,7 +18,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return (void *)vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_prot);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

/*
* This is the same as kmap_atomic() but can map memory that doesn't
diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h
index a60a02dc68f6..7152aeb1e3a4 100644
--- a/arch/xtensa/include/asm/highmem.h
+++ b/arch/xtensa/include/asm/highmem.h
@@ -68,7 +68,7 @@ static inline void flush_cache_kmaps(void)
flush_cache_all();
}

-void *kmap_atomic_high(struct page *page);
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
void kunmap_atomic_high(void *kvaddr);

void kmap_init(void);
diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c
index 8c58c4c37033..fe56644d7b23 100644
--- a/arch/xtensa/mm/highmem.c
+++ b/arch/xtensa/mm/highmem.c
@@ -37,7 +37,7 @@ static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
color;
}

-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
enum fixed_addresses idx;
unsigned long vaddr;
@@ -48,11 +48,11 @@ void *kmap_atomic_high(struct page *page)
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte + idx)));
#endif
- set_pte(kmap_pte + idx, mk_pte(page, kmap_prot));
+ set_pte(kmap_pte + idx, mk_pte(page, prot));

return (void *)vaddr;
}
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);

void kunmap_atomic_high(void *kvaddr)
{
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 601df07607a4..b10e8a39ae60 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -74,14 +74,15 @@ static inline void kunmap(struct page *page)
* be used in IRQ contexts, so in some (very limited) cases we need
* it.
*/
-static inline void *kmap_atomic(struct page *page)
+static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
{
preempt_disable();
pagefault_disable();
if (!PageHighMem(page))
return page_address(page);
- return kmap_atomic_high(page);
+ return kmap_atomic_high_prot(page, prot);
}
+#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot)

/* declarations for linux/mm/highmem.c */
unsigned int nr_free_highpages(void);
--
2.25.1