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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>
This commit is contained in:
Christophe Leroy 2018-01-23 14:22:50 +01:00 committed by Michael Ellerman
parent fc5f622163
commit 5c8136fa1a
1 changed files with 4 additions and 1 deletions
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5
arch/powerpc/mm/tlb_nohash.c
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@ -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);