linux-kernel - Re: [PATCH] dma: ste_dma40: fix unneeded variable warning

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Date:   Fri, 12 Jul 2019 10:39:12 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] dma: ste_dma40: fix unneeded variable warning

On Fri, Jul 12, 2019 at 11:13:30AM +0200, Arnd Bergmann wrote:
> clang-9 points out that there are two variables that depending on the
> configuration may only be used in an ARRAY_SIZE() expression but not
> referenced:
> 
> drivers/dma/ste_dma40.c:145:12: error: variable 'd40_backup_regs' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
> static u32 d40_backup_regs[] = {
>            ^
> drivers/dma/ste_dma40.c:214:12: error: variable 'd40_backup_regs_chan' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
> static u32 d40_backup_regs_chan[] = {
> 
> Mark these __maybe_unused to shut up the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Might be worth mentioning that this warning will only appear when
CONFIG_PM is unset (they are both used in d40_save_restore_registers).

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>