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powerpc/ptrace: Fix enforcement of DAWR constraints
Back when we first introduced the DAWR, in commit4ae7ebe952
("powerpc: Change hardware breakpoint to allow longer ranges"), we screwed up the constraint making it a 1024 byte boundary rather than a 512. This makes the check overly permissive. Fortunately GDB is the only real user and it always did they right thing, so we never noticed. This fixes the constraint to 512 bytes. Fixes:4ae7ebe952
("powerpc: Change hardware breakpoint to allow longer ranges") Cc: stable@vger.kernel.org # v3.9+ Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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1 changed files with 2 additions and 2 deletions
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@ -178,8 +178,8 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
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if (cpu_has_feature(CPU_FTR_DAWR)) {
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length_max = 512 ; /* 64 doublewords */
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/* DAWR region can't cross 512 boundary */
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if ((bp->attr.bp_addr >> 10) !=
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((bp->attr.bp_addr + bp->attr.bp_len - 1) >> 10))
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if ((bp->attr.bp_addr >> 9) !=
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((bp->attr.bp_addr + bp->attr.bp_len - 1) >> 9))
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return -EINVAL;
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}
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if (info->len >
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