On Thu, Mar 15, 2018 at 12:03:46PM +0300, Dan Carpenter wrote:
> Hello Andi Kleen,
>
> The patch 294fe0f52a44: "perf/x86/intel: Add INST_RETIRED.ALL
> workarounds" from Feb 17, 2015, leads to the following static checker
> warning:
>
> arch/x86/events/intel/core.c:3213 bdw_limit_period()
> warn: was expecting a 64 bit value instead of '63'
>
> arch/x86/events/intel/core.c
> 3207 static u64 bdw_limit_period(struct perf_event *event, u64 left)
> ^^^^^^^^
> 3208 {
> 3209 if ((event->hw.config & INTEL_ARCH_EVENT_MASK) ==
> 3210 X86_CONFIG(.event=0xc0, .umask=0x01)) {
> 3211 if (left < 128)
> 3212 left = 128;
> 3213 left &= ~0x3fu;
> ^^^^^^^^^^^^^^
> You're clearing the high 32 bits as well as the low 6. It should be
> ~0x3full.
Thanks. Looks good.
Please submit the patch. I don't think it will make much difference
in practice though because periods are rarely >32bit.
-Andi
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