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author | David S. Miller <davem@davemloft.net> | 2013-08-03 21:36:46 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2013-08-03 21:36:46 -0700 |
commit | 0e76a3a587fc7abda2badf249053b427baad255e (patch) | |
tree | 646a1da67dc25654552028225ca4b7a0a8043cc9 /arch/arm/include/asm/mmu_context.h | |
parent | fib_rules: reorder struct fib_rules fields (diff) | |
parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
download | linux-dev-0e76a3a587fc7abda2badf249053b427baad255e.tar.xz linux-dev-0e76a3a587fc7abda2badf249053b427baad255e.zip |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Merge net into net-next to setup some infrastructure Eric
Dumazet needs for usbnet changes.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/arm/include/asm/mmu_context.h')
-rw-r--r-- | arch/arm/include/asm/mmu_context.h | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/arm/include/asm/mmu_context.h b/arch/arm/include/asm/mmu_context.h index b5792b7fd8d3..9b32f76bb0dd 100644 --- a/arch/arm/include/asm/mmu_context.h +++ b/arch/arm/include/asm/mmu_context.h @@ -56,7 +56,7 @@ static inline void check_and_switch_context(struct mm_struct *mm, * on non-ASID CPUs, the old mm will remain valid until the * finish_arch_post_lock_switch() call. */ - set_ti_thread_flag(task_thread_info(tsk), TIF_SWITCH_MM); + mm->context.switch_pending = 1; else cpu_switch_mm(mm->pgd, mm); } @@ -65,9 +65,21 @@ static inline void check_and_switch_context(struct mm_struct *mm, finish_arch_post_lock_switch static inline void finish_arch_post_lock_switch(void) { - if (test_and_clear_thread_flag(TIF_SWITCH_MM)) { - struct mm_struct *mm = current->mm; - cpu_switch_mm(mm->pgd, mm); + struct mm_struct *mm = current->mm; + + if (mm && mm->context.switch_pending) { + /* + * Preemption must be disabled during cpu_switch_mm() as we + * have some stateful cache flush implementations. Check + * switch_pending again in case we were preempted and the + * switch to this mm was already done. + */ + preempt_disable(); + if (mm->context.switch_pending) { + mm->context.switch_pending = 0; + cpu_switch_mm(mm->pgd, mm); + } + preempt_enable_no_resched(); } } |