parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm

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commit febe42964f upstream.

We have four routines in pacache.S that use temporary alias pages:
copy_user_page_asm(), clear_user_page_asm(), flush_dcache_page_asm() and
flush_icache_page_asm().  copy_user_page_asm() and clear_user_page_asm()
don't purge the TLB entry used for the operation.
flush_dcache_page_asm() and flush_icache_page_asm do purge the entry.

Presumably, this was thought to optimize TLB use.  However, the
operation is quite heavy weight on PA 1.X processors as we need to take
the TLB lock and a TLB broadcast is sent to all processors.

This patch removes the purges from flush_dcache_page_asm() and
flush_icache_page_asm.

Signed-off-by: John David Anglin  <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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John David Anglin 2016-12-06 22:02:01 -05:00 • committed by Ben Hutchings

parent 76d794a5ac

commit 2cc1ff50c4

1 changed files with 1 additions and 21 deletions

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arch/parisc/kernel/pacache.S

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