Commit 030e3474 authored Feb 01, 2020 by Christophe Leroy Committed by Michael Ellerman Feb 19, 2020

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



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

parent d8e73458

arch/powerpc/mm/book3s32/tlb.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -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) {
		if (end - start <= PAGE_SIZE)
		_tlbie(start);
		else
		_tlbia();
		return;
		}
		start &= PAGE_MASK;
		if (start >= end)
		return;
		end = (end - 1) \| ~PAGE_MASK;

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