linux-kernel - Re: [PATCH] gcov: clang: fix clang-11+ build

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Date:   Mon, 12 Apr 2021 15:41:21 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Berg <johannes.berg@...el.com>
Subject: Re: [PATCH] gcov: clang: fix clang-11+ build

On Mon, Apr 12, 2021 at 12:42 PM Johannes Berg
<johannes@...solutions.net> wrote:
>
> From: Johannes Berg <johannes.berg@...el.com>
>
> 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.
>
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> ---
> This fixes a clang-11 build issue reported against current
> linux-next since the clang-11+ support landed in v5.12-rc5

Thanks for the patch, and noticing the breakage so quickly.  I
recently added GCOV to our CI, but I've been fighting enough fires
this morning that I haven't had time to check this particular build!

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

> and my kvmalloc() conversion patch is in akpm/linux-next.
> I guess this should be folded into
>
>   gcov: use kvmalloc()
>
> If desired, I can send a combined patch instead.
> ---
>  kernel/gcov/clang.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/gcov/clang.c b/kernel/gcov/clang.c
> index 04a65443005d..d43ffd0c5ddb 100644
> --- a/kernel/gcov/clang.c
> +++ b/kernel/gcov/clang.c
> @@ -368,7 +368,7 @@ static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
>         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;
> --
> 2.30.2
>


-- 
Thanks,
~Nick Desaulniers