powerpc/32: Clarify interrupt restores with REST_GPR macro in entry_32.S

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Restoring the register state of the interrupted thread involves issuing
a large number of predictable loads to the kernel stack frame. Issue the
REST_GPR{,S} macros to clearly signal when this is happening, and bunch
together restores at the end of the interrupt handler where the saved
value is not consumed earlier in the handler code.

Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220921065605.1051927-6-rmclure@linux.ibm.com

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Rohan McLure 2022-09-21 16:55:45 +10:00 • committed by Michael Ellerman

parent 2b1dac4b5f

commit 15ba74502c

1 changed files with 13 additions and 20 deletions

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arch/powerpc/kernel/entry_32.S

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