powerpc/mm: Pre-filter SRR1 bits before do_page_fault()

Browse source

By filtering the relevant SRR1 bits in the assembly rather than
in do_page_fault() itself, we avoid a conditional branch (since we
already come from different path for data and instruction faults).

This will allow more simplifications later

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

This commit is contained in:

Benjamin Herrenschmidt 2017-07-19 14:49:24 +10:00 • committed by Michael Ellerman

parent 7afad422ac

commit c433ec0455

3 changed files with 5 additions and 15 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/powerpc/kernel/head_32.S

View file

4

arch/powerpc/kernel/head_8xx.S

View file

14

arch/powerpc/mm/fault.c

View file