Re: [PATCH v1] perf loongarch: Fix discarded const qualifier in _get_field()

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

On Wed, Sep 23, 2026 at 10:23:27PM -0700, Namhyung Kim wrote:
> On Thu, Sep 24, 2026 at 10:17:56AM +0800, Tiezhu Yang wrote:
> > When building perf on LoongArch, the following compilation errors occur:
> > 
> >   CC      arch/loongarch/util/header.o
> > arch/loongarch/util/header.c: In function '_get_field':
> > arch/loongarch/util/header.c:31:15: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> >    31 |         line2 = strrchr(line, ' ');
> >       |               ^
> > arch/loongarch/util/header.c:36:12: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> >    36 |         nl = strrchr(line, '\n');
> >       |            ^
> > cc1: all warnings being treated as errors
> > 
> > Declare 'line2' and 'nl' as const char * to ensure type safety. In modern
> > glibc versions, strrchr() returns a 'const char *' if the input string is
> > const.
> > 
> > This is similar to commit 7378b6656aa4 ("perf riscv: Fix discarded const
> > qualifier in _get_field()").
> > 
> > Fixes: 492ac37fa38f ("perf kvm: Add kvm-stat for loongarch64")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> 
> Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks, applied to perf-tools-next, for v7.4.

- Arnaldo