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authorChristophe Leroy <christophe.leroy@c-s.fr>2018-01-23 14:22:50 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2018-01-27 20:24:44 +1100
commit5c8136fa1af7c0e9b4aec89cf2832f6e5197ce32 (patch)
treea8aadf6699651688193f374df647081770fbccc7 /arch/powerpc
parentfc5f622163637308a3d520a315527481cff023f5 (diff)
powerpc/mm/nohash: do not flush the entire mm when range is a single page
Most of the time, flush_tlb_range() is called on single pages. At the time being, flush_tlb_range() inconditionnaly calls flush_tlb_mm() which flushes at least the entire PID pages and on older CPUs like 4xx or 8xx it flushes the entire TLB table. This patch calls flush_tlb_page() instead of flush_tlb_mm() when the range is a single page. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/mm/tlb_nohash.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index bfc4a0869609..15fe5f0c8665 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -388,7 +388,10 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
- flush_tlb_mm(vma->vm_mm);
+ if (end - start == PAGE_SIZE && !(start & ~PAGE_MASK))
+ flush_tlb_page(vma, start);
+ else
+ flush_tlb_mm(vma->vm_mm);
}
EXPORT_SYMBOL(flush_tlb_range);