Re: [PATCH 4.19 092/229] once: add DO_ONCE_SLOW() for sleepable contexts

[Yongqin Liu]

Hi, Greg

On Tue, 1 Nov 2022 at 14:26, Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Tue, Nov 01, 2022 at 02:07:35PM +0800, Yongqin Liu wrote:
> > Hello,
> >
> > As mentioned in the thread for the 5.4 version here[1], it causes a
> > crash for the 4.19 kernel too.
> > Just paste the log here for reference:
>
> Can you try this patch please:
>
>
> diff --git a/include/linux/once.h b/include/linux/once.h
> index bb58e1c3aa03..3a6671d961b9 100644
> --- a/include/linux/once.h
> +++ b/include/linux/once.h
> @@ -64,7 +64,7 @@ void __do_once_slow_done(bool *done, struct static_key_true *once_key,
>  #define DO_ONCE_SLOW(func, ...)                                                     \
>         ({                                                                   \
>                 bool ___ret = false;                                         \
> -               static bool __section(".data.once") ___done = false;         \
> +               static bool __section(.data.once) ___done = false;           \
>                 static DEFINE_STATIC_KEY_TRUE(___once_key);                  \
>                 if (static_branch_unlikely(&___once_key)) {                  \
>                         ___ret = __do_once_slow_start(&___done);             \


This change works, it does not cause kernel panic again after this
change is applied.

-- 
Best Regards,
Yongqin Liu
---------------------------------------------------------------
#mailing list
linaro-android@xxxxxxxxxxxxxxxx
http://lists.linaro.org/mailman/listinfo/linaro-android