Re: [patch 11/12] gcov: clang: fix clang-11+ build

Nathan Chancellor
2021-04-19T21:37:06Z

On Fri, Apr 16, 2021 at 03:46:23PM -0700, Andrew Morton wrote:
> From: Johannes Berg <johannes.berg@intel.com>
> Subject: gcov: clang: fix clang-11+ build
>
> With clang-11+, the code is broken due to my kvmalloc() conversion (which
> predated the clang-11 support code) leaving one vmalloc() in place. Fix
> that.
>
> Link: https://lkml.kernel.org/r/20210412214210.6e1ecca9cdc5.I24459763acf0591d5e6b31c7e3a59890d802f79c@changeid
> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> Tested-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>
> kernel/gcov/clang.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/kernel/gcov/clang.c~gcov-clang-fix-clang-11-build
> +++ a/kernel/gcov/clang.c
> @@ -369,7 +369,7 @@ static struct gcov_fn_info *gcov_fn_info
> INIT_LIST_HEAD(&fn_dup->head);
>
> cv_size = fn->num_counters * sizeof(fn->counters[0]);
> - fn_dup->counters = vmalloc(cv_size);
> + fn_dup->counters = kvmalloc(cv_size, GFP_KERNEL);
> if (!fn_dup->counters) {
> kfree(fn_dup);
> return NULL;
> _

This should not have been merged into mainline by itself. It was a fix
for "gcov: use kvmalloc()", which is still in -mm/-next. Merging it
alone has now broken the build:

https://github.com/ClangBuiltLinux/continuous-integration2/runs/2384465683?check_suite_focus=true

Could it please be reverted in mainline then added as a fix patch for
the patch that is still in -mm:

https://www.ozlabs.org/~akpm/mmotm/broken-out/gcov-use-kvmalloc.patch

Cheers,
Nathan