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Date: Mon, 08 Dec 2014 14:12:50 +0100
From: Christian Borntraeger <borntraeger@...ibm.com>
To: David Hildenbrand <dahi@...ux.vnet.ibm.com>,
linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
CC: benh@...nel.crashing.org, paulus@...ba.org,
akpm@...ux-foundation.org, heiko.carstens@...ibm.com,
schwidefsky@...ibm.com, mst@...hat.com, tglx@...utronix.de,
David.Laight@...LAB.COM, peterz@...radead.org, hughd@...gle.com,
hocko@...e.cz
Subject: Re: [PATCH v1 1/5] uaccess: add pagefault_count to thread_info
Am 05.12.2014 um 12:18 schrieb David Hildenbrand:
> 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@...ux.vnet.ibm.com>
> ---
> 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 +++++++++--------
Maybe its easier to put the pagefault count at the end of the thread_info struct to make the patch smaller and easier to review for thoses architectures that have hand-maintained asm offsets?
> 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
>
--
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