Re: [PATCH v2 1/2] nfit: Fix the abuse of COMPLETION_INITIALIZER_ONSTACK()

[Dan Williams]

On Thu, Aug 24, 2017 at 7:22 AM, Boqun Feng <boqun.feng@xxxxxxxxx> wrote:
> COMPLETION_INITIALIZER_ONSTACK() is supposed to used as an initializer,
> in other words, it should only be used in assignment expressions or
> compound literals. So the usage in drivers/acpi/nfit/core.c:
>
>         COMPLETION_INITIALIZER_ONSTACK(flush.cmp);
>
> , is inappropriate.
>
> Besides, this usage could also break compilations for another fix to
> reduce stack sizes caused by COMPLETION_INITIALIZER_ONSTACK(), because
> that fix changes COMPLETION_INITIALIZER_ONSTACK() from rvalue to lvalue,
> and usage as above will report error:
>
>         drivers/acpi/nfit/core.c: In function 'acpi_nfit_flush_probe':
>         include/linux/completion.h:77:3: error: value computed is not used [-Werror=unused-value]
>           (*({ init_completion(&work); &work; }))
>
> This patch fixes this by replacing COMPLETION_INITIALIZER_ONSTACK() with
> init_completion() in acpi_nfit_flush_probe(), which does the same
> initialization without any other problem.
>
> Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>

Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx>