linux-kernel - Re: [PATCH v2 0/3] perf: Fixes for callchain ip handling on powerpc

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Date:   Wed, 18 Apr 2018 14:53:43 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>
Cc:     jolsa@...hat.com, linux-kernel@...r.kernel.org,
        naveen.n.rao@...ux.vnet.ibm.com, sukadev@...ux.vnet.ibm.com,
        maynard@...ibm.com
Subject: Re: [PATCH v2 0/3] perf: Fixes for callchain ip handling on powerpc

Em Wed, Apr 18, 2018 at 04:28:57PM +0530, Sandipan Das escreveu:
> The first patch fixes the callchain ip filtering mechanism for powerpc
> from skipping entries in case the LR value is still valid and yet to
> be written to the stack frame. This was previously posted as an RFC
> here: https://lkml.org/lkml/2018/4/4/633
> 
> The second patch fixes a crash caused by attempting to access an empty
> callchain.
> 
> The third patch fixes a shell test which used to fail on powerpc as
> the back trace from perf output did not match the expected pattern.
> Also, because of the issue described in the first patch, some entries
> from the callchain were incorrectly skipped. So, this has also been
> readjusted to work with the fix in the first patch.
 
> v2:
>  - Consider case when return address is in R0 as pointed out by Ravi.
>  - Add another patch to fix crash when callchain is empty.

Ravi, can you please take a look at these? The other two patches too,
please?

- Arnaldo