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Date: Thu, 03 Dec 2015 17:15:04 -0800 From: Dave Hansen <dave@...1.net> To: linux-kernel@...r.kernel.org Cc: linux-mm@...ck.org, x86@...nel.org, Dave Hansen <dave@...1.net>, dave.hansen@...ux.intel.com Subject: [PATCH 29/34] x86: separate out LDT init from context init From: Dave Hansen <dave.hansen@...ux.intel.com> The arch-specific mm_context_t is a great place to put protection-key allocation state. But, we need to initialize the allocation state because pkey 0 is always "allocated". All of the runtime initialization of mm_context_t is done in *_ldt() manipulation functions. This renames the existing LDT functions like this: init_new_context() -> init_new_context_ldt() destroy_context() -> destroy_context_ldt() and makes init_new_context() and destroy_context() available for generic use. Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> --- b/arch/x86/include/asm/mmu_context.h | 21 ++++++++++++++++----- b/arch/x86/kernel/ldt.c | 4 ++-- 2 files changed, 18 insertions(+), 7 deletions(-) diff -puN arch/x86/include/asm/mmu_context.h~init-ldt-extricate arch/x86/include/asm/mmu_context.h --- a/arch/x86/include/asm/mmu_context.h~init-ldt-extricate 2015-12-03 16:21:31.585941570 -0800 +++ b/arch/x86/include/asm/mmu_context.h 2015-12-03 16:21:31.590941797 -0800 @@ -53,15 +53,15 @@ struct ldt_struct { /* * Used for LDT copy/destruction. */ -int init_new_context(struct task_struct *tsk, struct mm_struct *mm); -void destroy_context(struct mm_struct *mm); +int init_new_context_ldt(struct task_struct *tsk, struct mm_struct *mm); +void destroy_context_ldt(struct mm_struct *mm); #else /* CONFIG_MODIFY_LDT_SYSCALL */ -static inline int init_new_context(struct task_struct *tsk, - struct mm_struct *mm) +static inline int init_new_context_ldt(struct task_struct *tsk, + struct mm_struct *mm) { return 0; } -static inline void destroy_context(struct mm_struct *mm) {} +static inline void destroy_context_ldt(struct mm_struct *mm) {} #endif static inline void load_mm_ldt(struct mm_struct *mm) @@ -105,6 +105,17 @@ static inline void enter_lazy_tlb(struct #endif } +static inline int init_new_context(struct task_struct *tsk, + struct mm_struct *mm) +{ + init_new_context_ldt(tsk, mm); + return 0; +} +static inline void destroy_context(struct mm_struct *mm) +{ + destroy_context_ldt(mm); +} + static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { diff -puN arch/x86/kernel/ldt.c~init-ldt-extricate arch/x86/kernel/ldt.c --- a/arch/x86/kernel/ldt.c~init-ldt-extricate 2015-12-03 16:21:31.587941660 -0800 +++ b/arch/x86/kernel/ldt.c 2015-12-03 16:21:31.590941797 -0800 @@ -103,7 +103,7 @@ static void free_ldt_struct(struct ldt_s * we do not have to muck with descriptors here, that is * done in switch_mm() as needed. */ -int init_new_context(struct task_struct *tsk, struct mm_struct *mm) +int init_new_context_ldt(struct task_struct *tsk, struct mm_struct *mm) { struct ldt_struct *new_ldt; struct mm_struct *old_mm; @@ -144,7 +144,7 @@ out_unlock: * * 64bit: Don't touch the LDT register - we're already in the next thread. */ -void destroy_context(struct mm_struct *mm) +void destroy_context_ldt(struct mm_struct *mm) { free_ldt_struct(mm->context.ldt); mm->context.ldt = NULL; _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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