[PATCH v1 1/5] uaccess: add pagefault_count to thread_info

From: David Hildenbrand
Date: Fri Dec 05 2014 - 06:19:35 EST

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This patch adds the pagefault_count to the thread_info of all
architectures. It will be used to count the pagefault_disable() levels
on a per-thread basis.

We are not reusing the preempt_count as this is per cpu on x86 and we want to
demangle pagefault_disable() from preemption in the future.

Signed-off-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
---
arch/alpha/include/asm/thread_info.h | 1 +
arch/arc/include/asm/thread_info.h | 1 +
arch/arm/include/asm/thread_info.h | 1 +
arch/arm64/include/asm/thread_info.h | 1 +
arch/avr32/include/asm/thread_info.h | 1 +
arch/blackfin/include/asm/thread_info.h | 1 +
arch/c6x/include/asm/thread_info.h | 1 +
arch/cris/include/asm/thread_info.h | 1 +
arch/frv/include/asm/thread_info.h | 1 +
arch/hexagon/include/asm/thread_info.h | 1 +
arch/ia64/include/asm/thread_info.h | 1 +
arch/m32r/include/asm/thread_info.h | 5 +++--
arch/m68k/include/asm/thread_info.h | 1 +
arch/metag/include/asm/thread_info.h | 1 +
arch/microblaze/include/asm/thread_info.h | 1 +
arch/mips/include/asm/thread_info.h | 1 +
arch/mn10300/include/asm/thread_info.h | 1 +
arch/openrisc/include/asm/thread_info.h | 1 +
arch/parisc/include/asm/thread_info.h | 1 +
arch/powerpc/include/asm/thread_info.h | 1 +
arch/s390/include/asm/thread_info.h | 1 +
arch/score/include/asm/thread_info.h | 1 +
arch/sh/include/asm/thread_info.h | 1 +
arch/sparc/include/asm/thread_info_32.h | 20 +++++++++++---------
arch/sparc/include/asm/thread_info_64.h | 17 +++++++++--------
arch/tile/include/asm/thread_info.h | 1 +
arch/um/include/asm/thread_info.h | 1 +
arch/unicore32/include/asm/thread_info.h | 1 +
arch/x86/include/asm/thread_info.h | 1 +
arch/xtensa/include/asm/thread_info.h | 5 +++--
30 files changed, 52 insertions(+), 21 deletions(-)

diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 48bbea6..1830671 100644
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -22,6 +22,7 @@ struct thread_info {
mm_segment_t addr_limit; /* thread address space */
unsigned cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
unsigned int status; /* thread-synchronous flags */

int bpt_nsaved;
diff --git a/arch/arc/include/asm/thread_info.h b/arch/arc/include/asm/thread_info.h
index 02bc5ec..2fde704 100644
--- a/arch/arc/include/asm/thread_info.h
+++ b/arch/arc/include/asm/thread_info.h
@@ -41,6 +41,7 @@
struct thread_info {
unsigned long flags; /* low level flags */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count; /* pagefault_disable() levels */
struct task_struct *task; /* main task structure */
mm_segment_t addr_limit; /* thread address space */
struct exec_domain *exec_domain;/* execution domain */
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index ce73ab6..bf47d2d 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -51,6 +51,7 @@ struct cpu_context_save {
struct thread_info {
unsigned long flags; /* low level flags */
int preempt_count; /* 0 => preemptable, <0 => bug */
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit; /* address limit */
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 459bf8e..2469f15 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -50,6 +50,7 @@ struct thread_info {
struct exec_domain *exec_domain; /* execution domain */
struct restart_block restart_block;
int preempt_count; /* 0 => preemptable, <0 => bug */
+ int pagefault_count;/* pagefault_disable() levels */
int cpu; /* cpu */
};

diff --git a/arch/avr32/include/asm/thread_info.h b/arch/avr32/include/asm/thread_info.h
index a978f3f..0c1d6f7 100644
--- a/arch/avr32/include/asm/thread_info.h
+++ b/arch/avr32/include/asm/thread_info.h
@@ -25,6 +25,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
__u32 cpu;
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
+ __s32 pagefault_count;/* pagefault_disable() levels */
__u32 rar_saved; /* return address... */
__u32 rsr_saved; /* ...and status register
saved by debug handler
diff --git a/arch/blackfin/include/asm/thread_info.h b/arch/blackfin/include/asm/thread_info.h
index 55f473b..3ba26aa 100644
--- a/arch/blackfin/include/asm/thread_info.h
+++ b/arch/blackfin/include/asm/thread_info.h
@@ -41,6 +41,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
int cpu; /* cpu we're on */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count; /* pagefault_disable() levels */
mm_segment_t addr_limit; /* address limit */
struct restart_block restart_block;
#ifndef CONFIG_SMP
diff --git a/arch/c6x/include/asm/thread_info.h b/arch/c6x/include/asm/thread_info.h
index d4e9ef8..6b2dcac 100644
--- a/arch/c6x/include/asm/thread_info.h
+++ b/arch/c6x/include/asm/thread_info.h
@@ -44,6 +44,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
int cpu; /* cpu we're on */
int preempt_count; /* 0 = preemptable, <0 = BUG */
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit; /* thread address space */
struct restart_block restart_block;
};
diff --git a/arch/cris/include/asm/thread_info.h b/arch/cris/include/asm/thread_info.h
index 55dede1..3356902 100644
--- a/arch/cris/include/asm/thread_info.h
+++ b/arch/cris/include/asm/thread_info.h
@@ -32,6 +32,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
__u32 tls; /* TLS for this thread */

mm_segment_t addr_limit; /* thread address space:
diff --git a/arch/frv/include/asm/thread_info.h b/arch/frv/include/asm/thread_info.h
index af29e17..79a97ee 100644
--- a/arch/frv/include/asm/thread_info.h
+++ b/arch/frv/include/asm/thread_info.h
@@ -36,6 +36,7 @@ struct thread_info {
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space:
* 0-0xBFFFFFFF for user-thead
diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h
index a59dad3..d54042e 100644
--- a/arch/hexagon/include/asm/thread_info.h
+++ b/arch/hexagon/include/asm/thread_info.h
@@ -51,6 +51,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
__u32 cpu; /* current cpu */
int preempt_count; /* 0=>preemptible,<0=>BUG */
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit; /* segmentation sux */
/*
* used for syscalls somehow;
diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
index 5b17418..14f128c 100644
--- a/arch/ia64/include/asm/thread_info.h
+++ b/arch/ia64/include/asm/thread_info.h
@@ -27,6 +27,7 @@ struct thread_info {
__u32 status; /* Thread synchronous flags */
mm_segment_t addr_limit; /* user-level address space limit */
int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
+ int pagefault_count; /* pagefault_disable() levels */
struct restart_block restart_block;
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
__u64 ac_stamp;
diff --git a/arch/m32r/include/asm/thread_info.h b/arch/m32r/include/asm/thread_info.h
index 0017170..a1ec910 100644
--- a/arch/m32r/include/asm/thread_info.h
+++ b/arch/m32r/include/asm/thread_info.h
@@ -29,6 +29,7 @@ struct thread_info {
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space:
0-0xBFFFFFFF for user-thread
@@ -48,8 +49,8 @@ struct thread_info {
#define TI_STATUS 0x0000000C
#define TI_CPU 0x00000010
#define TI_PRE_COUNT 0x00000014
-#define TI_ADDR_LIMIT 0x00000018
-#define TI_RESTART_BLOCK 0x000001C
+#define TI_ADDR_LIMIT 0x0000001C
+#define TI_RESTART_BLOCK 0x0000020

#endif

diff --git a/arch/m68k/include/asm/thread_info.h b/arch/m68k/include/asm/thread_info.h
index 21a4784..5a6a203 100644
--- a/arch/m68k/include/asm/thread_info.h
+++ b/arch/m68k/include/asm/thread_info.h
@@ -29,6 +29,7 @@ struct thread_info {
struct exec_domain *exec_domain; /* execution domain */
mm_segment_t addr_limit; /* thread address space */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
__u32 cpu; /* should always be 0 on m68k */
unsigned long tp_value; /* thread pointer */
struct restart_block restart_block;
diff --git a/arch/metag/include/asm/thread_info.h b/arch/metag/include/asm/thread_info.h
index 4771133..91729f5 100644
--- a/arch/metag/include/asm/thread_info.h
+++ b/arch/metag/include/asm/thread_info.h
@@ -33,6 +33,7 @@ struct thread_info {
unsigned long status; /* thread-synchronous flags */
u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count; /* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space */
struct restart_block restart_block;
diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
index 8c9d365..f905b02 100644
--- a/arch/microblaze/include/asm/thread_info.h
+++ b/arch/microblaze/include/asm/thread_info.h
@@ -70,6 +70,7 @@ struct thread_info {
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
+ __s32 pagefault_count; /* pagefault_disable() levels */
mm_segment_t addr_limit; /* thread address space */
struct restart_block restart_block;

diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index 7de8658..f9f27ac 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -28,6 +28,7 @@ struct thread_info {
unsigned long tp_value; /* thread pointer */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /*
* thread address space limit:
diff --git a/arch/mn10300/include/asm/thread_info.h b/arch/mn10300/include/asm/thread_info.h
index bf280ea..f6c03a5 100644
--- a/arch/mn10300/include/asm/thread_info.h
+++ b/arch/mn10300/include/asm/thread_info.h
@@ -45,6 +45,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
+ __s32 pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space:
0-0xBFFFFFFF for user-thead
diff --git a/arch/openrisc/include/asm/thread_info.h b/arch/openrisc/include/asm/thread_info.h
index d797acc..bdabd6e 100644
--- a/arch/openrisc/include/asm/thread_info.h
+++ b/arch/openrisc/include/asm/thread_info.h
@@ -52,6 +52,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
+ __s32 pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space:
0-0x7FFFFFFF for user-thead
diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index a846118..e37b76b 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -14,6 +14,7 @@ struct thread_info {
mm_segment_t addr_limit; /* user-level address space limit */
__u32 cpu; /* current CPU */
int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
+ int pagefault_count; /* pagefault_disable() levels */
struct restart_block restart_block;
};

diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index b034ecd..e8585fd 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -43,6 +43,7 @@ struct thread_info {
int cpu; /* cpu we're on */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
+ int pagefault_count; /* pagefault_disable() levels */
struct restart_block restart_block;
unsigned long local_flags; /* private flags for thread */

diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index 4d62fd5..bbf0513f 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -39,6 +39,7 @@ struct thread_info {
unsigned long sys_call_table; /* System call table address */
unsigned int cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
struct restart_block restart_block;
unsigned int system_call;
__u64 user_timer;
diff --git a/arch/score/include/asm/thread_info.h b/arch/score/include/asm/thread_info.h
index 656b7ad..d7f748d 100644
--- a/arch/score/include/asm/thread_info.h
+++ b/arch/score/include/asm/thread_info.h
@@ -35,6 +35,7 @@ struct thread_info {

/* 0 => preemptable, < 0 => BUG */
int preempt_count;
+ int pagefault_count;/* pagefault_disable() levels */

/*
* thread address space:
diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h
index ad27ffa..682a466 100644
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@ -32,6 +32,7 @@ struct thread_info {
__u32 status; /* thread synchronous flags */
__u32 cpu;
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit; /* thread address space */
struct restart_block restart_block;
unsigned long previous_sp; /* sp of previous stack in case
diff --git a/arch/sparc/include/asm/thread_info_32.h b/arch/sparc/include/asm/thread_info_32.h
index 025c984..3dc0054 100644
--- a/arch/sparc/include/asm/thread_info_32.h
+++ b/arch/sparc/include/asm/thread_info_32.h
@@ -32,6 +32,7 @@ struct thread_info {
int cpu; /* cpu we're on */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
int softirq_count;
int hardirq_count;

@@ -94,15 +95,16 @@ register struct thread_info *current_thread_info_reg asm("g6");
#define TI_FLAGS 0x0c
#define TI_CPU 0x10
#define TI_PREEMPT 0x14 /* preempt_count */
-#define TI_SOFTIRQ 0x18 /* softirq_count */
-#define TI_HARDIRQ 0x1c /* hardirq_count */
-#define TI_KSP 0x20 /* ksp */
-#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
-#define TI_KPSR 0x28 /* kpsr */
-#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
-#define TI_REG_WINDOW 0x30
-#define TI_RWIN_SPTRS 0x230
-#define TI_W_SAVED 0x250
+/* #define TI_PAGEFAULT 0x18 */ /* pagefault_count */
+#define TI_SOFTIRQ 0x1c /* softirq_count */
+#define TI_HARDIRQ 0x20 /* hardirq_count */
+#define TI_KSP 0x24 /* ksp */
+#define TI_KPC 0x28 /* kpc (ldd'ed with kpc) */
+#define TI_KPSR 0x2c /* kpsr */
+#define TI_KWIM 0x30 /* kwim (ldd'ed with kpsr) */
+#define TI_REG_WINDOW 0x34
+#define TI_RWIN_SPTRS 0x234
+#define TI_W_SAVED 0x254
/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */

/*
diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h
index 798f027..4b54608 100644
--- a/arch/sparc/include/asm/thread_info_64.h
+++ b/arch/sparc/include/asm/thread_info_64.h
@@ -50,6 +50,7 @@ struct thread_info {
__u8 current_ds;
__u16 cpu;

+ int pagefault_count;/* pagefault_disable() levels */
unsigned long *utraps;

struct reg_window reg_window[NSWINS];
@@ -87,14 +88,14 @@ struct thread_info {
#define TI_NEW_CHILD 0x0000003c
#define TI_CURRENT_DS 0x0000003d
#define TI_CPU 0x0000003e
-#define TI_UTRAPS 0x00000040
-#define TI_REG_WINDOW 0x00000048
-#define TI_RWIN_SPTRS 0x000003c8
-#define TI_GSR 0x00000400
-#define TI_XFSR 0x00000438
-#define TI_RESTART_BLOCK 0x00000470
-#define TI_KUNA_REGS 0x000004a0
-#define TI_KUNA_INSN 0x000004a8
+#define TI_UTRAPS 0x00000048
+#define TI_REG_WINDOW 0x00000050
+#define TI_RWIN_SPTRS 0x000003d0
+#define TI_GSR 0x00000408
+#define TI_XFSR 0x00000440
+#define TI_RESTART_BLOCK 0x00000478
+#define TI_KUNA_REGS 0x000004a8
+#define TI_KUNA_INSN 0x000004b0
#define TI_FPREGS 0x000004c0

/* We embed this in the uppermost byte of thread_info->flags */
diff --git a/arch/tile/include/asm/thread_info.h b/arch/tile/include/asm/thread_info.h
index 48e4fd0..57032b6 100644
--- a/arch/tile/include/asm/thread_info.h
+++ b/arch/tile/include/asm/thread_info.h
@@ -33,6 +33,7 @@ struct thread_info {
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space
(KERNEL_DS or USER_DS) */
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
index 1c5b2a8..90b193c 100644
--- a/arch/um/include/asm/thread_info.h
+++ b/arch/um/include/asm/thread_info.h
@@ -19,6 +19,7 @@ struct thread_info {
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable,
<0 => BUG */
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit; /* thread address space:
0-0xBFFFFFFF for user
0-0xFFFFFFFF for kernel */
diff --git a/arch/unicore32/include/asm/thread_info.h b/arch/unicore32/include/asm/thread_info.h
index af36d8e..1d50fb3 100644
--- a/arch/unicore32/include/asm/thread_info.h
+++ b/arch/unicore32/include/asm/thread_info.h
@@ -69,6 +69,7 @@ struct thread_info {
unsigned long flags; /* low level flags */
int preempt_count; /* 0 => preemptable */
/* <0 => bug */
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit; /* address limit */
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 547e344..fa075ab 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -30,6 +30,7 @@ struct thread_info {
__u32 status; /* thread synchronous flags */
__u32 cpu; /* current CPU */
int saved_preempt_count;
+ int pagefault_count;/* pagefault_disable() levels */
mm_segment_t addr_limit;
struct restart_block restart_block;
void __user *sysenter_return;
diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h
index 470153e..079e175 100644
--- a/arch/xtensa/include/asm/thread_info.h
+++ b/arch/xtensa/include/asm/thread_info.h
@@ -49,6 +49,7 @@ struct thread_info {
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
+ __s32 pagefault_count;/* pagefault_disable() levels */

mm_segment_t addr_limit; /* thread address space */
struct restart_block restart_block;
@@ -71,8 +72,8 @@ struct thread_info {
#define TI_STATUS 0x0000000C
#define TI_CPU 0x00000010
#define TI_PRE_COUNT 0x00000014
-#define TI_ADDR_LIMIT 0x00000018
-#define TI_RESTART_BLOCK 0x000001C
+#define TI_ADDR_LIMIT 0x0000001c
+#define TI_RESTART_BLOCK 0x00000020

#endif

--
1.8.5.5

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Next message: Sanjay Singh Rawat: "[PATCH] usb: gadget: f_mass_storage: restore address range on exit"
Previous message: David Hildenbrand: "[PATCH v1 2/5] uaccess: count pagefault_disable() levels in pagefault_count"
In reply to: David Hildenbrand: "[PATCH v1 2/5] uaccess: count pagefault_disable() levels in pagefault_count"
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