linux-kernel - Re: [PATCH] power: vexpress: fix -Wvoid-pointer-to-enum-cast warning

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Date:   Fri, 18 Aug 2023 10:44:53 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Liviu Dudau <liviu.dudau@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] power: vexpress: fix -Wvoid-pointer-to-enum-cast warning

On Mon, Aug 14, 2023 at 10:21:51PM +0000, Justin Stitt wrote:
> When building with clang 18 I see the following warning:
> |       drivers/power/reset/vexpress-poweroff.c:124:10: warning: cast to smaller integer type 'enum vexpress_reset_func' from 'const void *' [-Wvoid-pointer-to-enum-cast]
> |         124 |         switch ((enum vexpress_reset_func)match->data) {
> 
> This is due to the fact that `match->data` is a void* while `enum vexpress_reset_func`
> has the size of an int. This leads to truncation and possible data loss.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/1910
> Reported-by: Nathan Chancellor <nathan@...nel.org>

Hi Sebastian,

I am assuming you will pick this up.

Acked-by: Sudeep Holla <sudeep.holla@....com>

-- 
Regards,
Sudeep