powerpc: Mark [h]ssr_valid accesses in check_return_regs_valid

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Checks to see if the [H]SRR registers have been clobbered by (soft)
NMI interrupts imply the possibility for a data race on the
[h]srr_valid entries in the PACA. Annotate accesses to these fields with
READ_ONCE, removing the need for the barrier.

The diagnostic can use plain-access reads and writes, but annotate with
data_race.

Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230510033117.1395895-5-rmclure@linux.ibm.com

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Rohan McLure 2023-05-10 13:31:10 +10:00 • committed by Michael Ellerman

parent 6f3136326e

commit be286b8637

2 changed files with 8 additions and 10 deletions

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4

arch/powerpc/include/asm/ptrace.h

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14

arch/powerpc/kernel/interrupt.c

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