Commit 5c8136fa authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman

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: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent fc5f6221
...@@ -388,6 +388,9 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, ...@@ -388,6 +388,9 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end) unsigned long end)
{ {
if (end - start == PAGE_SIZE && !(start & ~PAGE_MASK))
flush_tlb_page(vma, start);
else
flush_tlb_mm(vma->vm_mm); flush_tlb_mm(vma->vm_mm);
} }
EXPORT_SYMBOL(flush_tlb_range); EXPORT_SYMBOL(flush_tlb_range);
......
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