On Wed, Aug 20, 2025 at 04:15:47PM -0500, Lucas De Marchi wrote:
> On Wed, Aug 20, 2025 at 08:16:11PM +0000, Carlos Llamas wrote:
> > Commit b0a2ee5567ab ("drm/xe: prepare xe_gen_wa_oob to be multi-use")
> > introduced a call to basename(). The GNU version of this function is not
> > portable and fails to build with alternative libc implementations like
> > musl or bionic. This causes the following build error:
> >
> > drivers/gpu/drm/xe/xe_gen_wa_oob.c:130:12: error: assignment to ‘const
> > char *’ from ‘int’ makes pointer from integer without a cast
> > [-Wint-conversion]
> > 130 | fn = basename(fn);
> > | ^
> >
> > While a POSIX version of basename() could be used, it would require a
> > separate header plus the behavior differs from GNU version in that it
> > might modify its argument. Not great.
> >
> > Instead replace basename() with a strrchr() based implementation which
> > provides the same functionality and avoid portability issues.
> >
> > Fixes: b0a2ee5567ab ("drm/xe: prepare xe_gen_wa_oob to be multi-use")
> > Signed-off-by: Carlos Llamas <cmlla...@google.com>
> > ---
> > drivers/gpu/drm/xe/xe_gen_wa_oob.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/xe/xe_gen_wa_oob.c
> > b/drivers/gpu/drm/xe/xe_gen_wa_oob.c
> > index 6581cb0f0e59..0a94a045bcea 100644
> > --- a/drivers/gpu/drm/xe/xe_gen_wa_oob.c
> > +++ b/drivers/gpu/drm/xe/xe_gen_wa_oob.c
> > @@ -125,9 +125,11 @@ static int parse(FILE *input, FILE *csource, FILE
> > *cheader, char *prefix)
> >
> > static int fn_to_prefix(const char *fn, char *prefix, size_t size)
> > {
> > + const char *base;
> > size_t len;
> >
> > - fn = basename(fn);
> > + base = strrchr(fn, '/');
> > + fn = base ? base + 1 : fn;
>
> I think just a xbasename() helper like we've added in kmod would be
> preferred:
> https://github.com/kmod-project/kmod/commit/11eb9bc67c319900ab00523997323a97d2d08ad2
>
> Alternativelly add it somewhere that can be shared across the userspace
> tools in the kernel tree to fix the mess that we have here:
>
> git grep basename -- tools/**.c
>
This sounds like a nice idea. However, there is no "centralized" shared
includes/ across the userspace tools that I'm aware of?
> Some dup the arg simply to be able to use the libgen.h version, some use
> one or the other on purpose, etc etc.
>
Yeah, and I can force the POSIX version if you prefer. I just personally
think the strrchr() alternative ends up being simpler.
--
Carlos Llamas
