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| author |   Paul Burton <paul.burton@mips.com> | 2019-02-02 01:43:18 +0000 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2019-02-04 10:56:16 -0800 |
| commit | 67741ba3ba006558ac3541488c1db9dff9507e73 (patch) | |
| tree | 3d87bc5f940917954b8a1777222beba16b0ce860 /arch/mips/include | |
| parent | MIPS: mm: Remove redundant get_new_mmu_context() cpu argument (diff) | |
| download | linux-dev-67741ba3ba006558ac3541488c1db9dff9507e73.tar.xz linux-dev-67741ba3ba006558ac3541488c1db9dff9507e73.zip | |
MIPS: mm: Avoid HTW stop/start when dropping an inactive mm
If drop_mmu_context() is called with an mm that is not currently active
on the local CPU then there's no need for us to stop & start a hardware
page table walker because it can't be fetching entries for the ASID
corresponding to the mm we're operating on.
Move the htw_stop() & htw_start() calls into the block which we run only
if the mm is currently active, in order to avoid the redundant work.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/mmu_context.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mmu_context.h index 0d050d781737..5d0a73a5cf40 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -184,17 +184,18 @@ drop_mmu_context(struct mm_struct *mm) unsigned int cpu; local_irq_save(flags); - htw_stop(); cpu = smp_processor_id(); if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { + htw_stop(); get_new_mmu_context(mm); write_c0_entryhi(cpu_asid(cpu, mm)); + htw_start(); } else { /* will get a new context next time */ cpu_context(cpu, mm) = 0; } - htw_start(); + local_irq_restore(flags); } |