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powerpc/32s: Don't flush all TLBs when flushing one page

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When flushing any memory range, the flushing function
flushes all TLBs.

When (start) and (end - 1) are in the same memory page,
flush that page instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b30b2eae6960502eaf0d9e36c60820b839693c33.1580542939.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2020-02-01 08:04:31 +00:00 committed by Michael Ellerman
parent d8e73458f3
commit 030e347430
1 changed files with 5 additions and 2 deletions
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7
arch/powerpc/mm/book3s32/tlb.c
View file

@ -79,11 +79,14 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
int count;
unsigned int ctx = mm->context.id;
start &= PAGE_MASK;
if (!Hash) {
_tlbia();
if (end - start <= PAGE_SIZE)
_tlbie(start);
else
_tlbia();
return;
}
start &= PAGE_MASK;
if (start >= end)
return;
end = (end - 1) | ~PAGE_MASK;