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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-07-24 06:28:02 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-23 14:28:38 +0200 |
| commit | a619e59c075c66e530a88e57b45bb0417e2f4fff (patch) | |
| tree | 5f725ed75bdccc3bbd715ae8fb400ae0e55062b2 /arch/powerpc/mm | |
| parent | powerpc/mm: Use mm_is_thread_local() instread of open-coding (diff) | |
| download | linux-a619e59c075c66e530a88e57b45bb0417e2f4fff.tar.xz linux-a619e59c075c66e530a88e57b45bb0417e2f4fff.zip | |
powerpc/mm: Optimize detection of thread local mm's
Instead of comparing the whole CPU mask every time, let's
keep a counter of how many bits are set in the mask. Thus
testing for a local mm only requires testing if that counter
is 1 and the current CPU bit is set in the mask.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_book3s64.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c index 60188f4b3ecd..05e15386d4cb 100644 --- a/arch/powerpc/mm/mmu_context_book3s64.c +++ b/arch/powerpc/mm/mmu_context_book3s64.c @@ -170,6 +170,8 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm) #ifdef CONFIG_SPAPR_TCE_IOMMU mm_iommu_init(mm); #endif + atomic_set(&mm->context.active_cpus, 0); + return 0; } |