powerpc/32s: Don't use SPRN_SPRG_PGDIR in hash_page

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SPRN_SPRG_PGDIR is there mainly to speedup SW TLB miss handlers
for powerpc 603.

We need to free SPRN_SPRG2 to reduce the mess with CONFIG_VMAP_STACK.

In hash_page(), reading PGDIR from thread_struct will be in the noise
performance wise.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4adca19b7120cdf619956768ed09e74fc6a558f3.1606285014.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2020-11-25 07:10:49 +00:00 • committed by Michael Ellerman

parent 7b107a71e7

commit 03d701c2d9

1 changed files with 5 additions and 4 deletions

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arch/powerpc/mm/book3s32/hash_low.S

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