diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0005-x86-mm-Give-each-mm-TLB-flush-generation-a-unique-ID.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0005-x86-mm-Give-each-mm-TLB-flush-generation-a-unique-ID.patch | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0005-x86-mm-Give-each-mm-TLB-flush-generation-a-unique-ID.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0005-x86-mm-Give-each-mm-TLB-flush-generation-a-unique-ID.patch deleted file mode 100644 index b21b0f41..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0005-x86-mm-Give-each-mm-TLB-flush-generation-a-unique-ID.patch +++ /dev/null @@ -1,117 +0,0 @@ -From 9c30656e4da86d6c69ad832ed9cb3e549b939566 Mon Sep 17 00:00:00 2001 -From: Andy Lutomirski <luto@kernel.org> -Date: Thu, 29 Jun 2017 08:53:15 -0700 -Subject: [PATCH 05/14] x86/mm: Give each mm TLB flush generation a unique ID - -commit f39681ed0f48498b80455095376f11535feea332 upstream. - -This adds two new variables to mmu_context_t: ctx_id and tlb_gen. -ctx_id uniquely identifies the mm_struct and will never be reused. -For a given mm_struct (and hence ctx_id), tlb_gen is a monotonic -count of the number of times that a TLB flush has been requested. -The pair (ctx_id, tlb_gen) can be used as an identifier for TLB -flush actions and will be used in subsequent patches to reliably -determine whether all needed TLB flushes have occurred on a given -CPU. - -This patch is split out for ease of review. By itself, it has no -real effect other than creating and updating the new variables. - -Signed-off-by: Andy Lutomirski <luto@kernel.org> -Reviewed-by: Nadav Amit <nadav.amit@gmail.com> -Reviewed-by: Thomas Gleixner <tglx@linutronix.de> -Cc: Andrew Morton <akpm@linux-foundation.org> -Cc: Arjan van de Ven <arjan@linux.intel.com> -Cc: Borislav Petkov <bp@alien8.de> -Cc: Dave Hansen <dave.hansen@intel.com> -Cc: Linus Torvalds <torvalds@linux-foundation.org> -Cc: Mel Gorman <mgorman@suse.de> -Cc: Peter Zijlstra <peterz@infradead.org> -Cc: Rik van Riel <riel@redhat.com> -Cc: linux-mm@kvack.org -Link: http://lkml.kernel.org/r/413a91c24dab3ed0caa5f4e4d017d87b0857f920.1498751203.git.luto@kernel.org -Signed-off-by: Ingo Molnar <mingo@kernel.org> -Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/include/asm/mmu.h | 15 +++++++++++++-- - arch/x86/include/asm/mmu_context.h | 5 +++++ - arch/x86/mm/tlb.c | 2 ++ - 3 files changed, 20 insertions(+), 2 deletions(-) - -diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h -index 8b272a0..e2e0934 100644 ---- a/arch/x86/include/asm/mmu.h -+++ b/arch/x86/include/asm/mmu.h -@@ -3,12 +3,18 @@ - - #include <linux/spinlock.h> - #include <linux/mutex.h> -+#include <linux/atomic.h> - - /* -- * The x86 doesn't have a mmu context, but -- * we put the segment information here. -+ * x86 has arch-specific MMU state beyond what lives in mm_struct. - */ - typedef struct { -+ /* -+ * ctx_id uniquely identifies this mm_struct. A ctx_id will never -+ * be reused, and zero is not a valid ctx_id. -+ */ -+ u64 ctx_id; -+ - #ifdef CONFIG_MODIFY_LDT_SYSCALL - struct ldt_struct *ldt; - #endif -@@ -33,6 +39,11 @@ typedef struct { - #endif - } mm_context_t; - -+#define INIT_MM_CONTEXT(mm) \ -+ .context = { \ -+ .ctx_id = 1, \ -+ } -+ - void leave_mm(int cpu); - - #endif /* _ASM_X86_MMU_H */ -diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h -index 762d6c6..1ed17c92 100644 ---- a/arch/x86/include/asm/mmu_context.h -+++ b/arch/x86/include/asm/mmu_context.h -@@ -12,6 +12,9 @@ - #include <asm/tlbflush.h> - #include <asm/paravirt.h> - #include <asm/mpx.h> -+ -+extern atomic64_t last_mm_ctx_id; -+ - #ifndef CONFIG_PARAVIRT - static inline void paravirt_activate_mm(struct mm_struct *prev, - struct mm_struct *next) -@@ -106,6 +109,8 @@ 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) - { -+ mm->context.ctx_id = atomic64_inc_return(&last_mm_ctx_id); -+ - #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS - if (cpu_feature_enabled(X86_FEATURE_OSPKE)) { - /* pkey 0 is the default and always allocated */ -diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c -index 613d07e..146e842 100644 ---- a/arch/x86/mm/tlb.c -+++ b/arch/x86/mm/tlb.c -@@ -29,6 +29,8 @@ - * Implement flush IPI by CALL_FUNCTION_VECTOR, Alex Shi - */ - -+atomic64_t last_mm_ctx_id = ATOMIC64_INIT(1); -+ - struct flush_tlb_info { - struct mm_struct *flush_mm; - unsigned long flush_start; --- -2.7.4 - |