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Merge "arm64: SW PAN: Update saved ttbr0 value on enter_lazy_tlb"

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Linux Build Service Account 2017-12-30 20:50:17 -08:00 • committed by Gerrit - the friendly Code Review server
commit a0befb254e
1 changed files with 10 additions and 14 deletions
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24
arch/arm64/include/asm/mmu_context.h
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@ -165,20 +165,6 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
#define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.id, 0); 0; }) #define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.id, 0); 0; })
/*
* This is called when "tsk" is about to enter lazy TLB mode.
*
* mm: describes the currently active mm context
* tsk: task which is entering lazy tlb
* cpu: cpu number which is entering lazy tlb
*
* tsk->mm will be NULL
*/
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
#ifdef CONFIG_ARM64_SW_TTBR0_PAN #ifdef CONFIG_ARM64_SW_TTBR0_PAN
static inline void update_saved_ttbr0(struct task_struct *tsk, static inline void update_saved_ttbr0(struct task_struct *tsk,
struct mm_struct *mm) struct mm_struct *mm)
@ -202,6 +188,16 @@ static inline void update_saved_ttbr0(struct task_struct *tsk,
} }
#endif #endif
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
/*
* We don't actually care about the ttbr0 mapping, so point it at the
* zero page.
*/
update_saved_ttbr0(tsk, &init_mm);
}
static inline void __switch_mm(struct mm_struct *next) static inline void __switch_mm(struct mm_struct *next)
{ {
unsigned int cpu = smp_processor_id(); unsigned int cpu = smp_processor_id();