Re: [PATCH v1 09/12] perf cs-etm: Fall back to the recorded instruction size on a failed read

[Arnaldo Carvalho de Melo <acme@kernel.org>]

On Fri, Nov 13, 2026 at 03:15:49PM +0000, Leo Yan wrote:
> Hi Arnaldo,
> 
> On Fri, Nov 13, 2026 at 12:05:50PM -0300, Arnaldo Carvalho de Melo wrote:
> > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> > 
> > cs_etm__t32_instr_size() reads the instruction bytes from the traced
> > program's memory to tell a 16-bit from a 32-bit T32 instruction, but it
> > ignores cs_etm__frontend_mem_access() failing, which happens when the
> > DSO or its debug data is missing, and then reads the uninitialized
> > buffer.  GCC 16 warns about it and build-test fails with -Werror.
> > 
> > Use the instruction size recorded by the decoder, as the A32/A64 path
> > already does, when the read doesn't return the full two bytes.
> 
> This patch is duplicate with:
> 
> https://lore.kernel.org/linux-perf-users/20261113-perf_fix_gcc15_failure-v1-0-eae592c5ff64@arm.com/T/#m5f610e381705bc587a9ce3d31be4e1e0ed595506
> 
> I prefer that one, it handle cs_etm__frontend_mem_access() failure
> throughly.

Ok, I'll replace it with yours,

- Arnaldo