linux-kernel - Re: [PATCH] powerpc: ps3: mark ps3_notification

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Date: Thu, 21 Mar 2024 09:03:29 +0900
From: Geoff Levand <geoff@...radead.org>
To: Arnd Bergmann <arnd@...nel.org>, Michael Ellerman <mpe@...erman.id.au>,
 Nathan Chancellor <nathan@...nel.org>, Paul Mackerras <paulus@...abs.org>,
 Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc: Arnd Bergmann <arnd@...db.de>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
 "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Kevin Hao <haokexin@...il.com>, linuxppc-dev@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] powerpc: ps3: mark ps3_notification_device static for
 stack usage

On 3/21/24 03:03, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The device is way too large to be on the stack, causing a warning for
> an allmodconfig build with clang:
> 
> arch/powerpc/platforms/ps3/device-init.c:771:12: error: stack frame size (2064) exceeds limit (2048) in 'ps3_probe_thread' [-Werror,-Wframe-larger-than]
>   771 | static int ps3_probe_thread(void *data)
> 
> There is only a single thread that ever accesses this, so it's fine to
> make it static, which avoids the warning.
> 
> Fixes: b4cb2941f855 ("[POWERPC] PS3: Use the HVs storage device notification mechanism properly")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/powerpc/platforms/ps3/device-init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/ps3/device-init.c b/arch/powerpc/platforms/ps3/device-init.c
> index 878bc160246e..ce99f06698a9 100644
> --- a/arch/powerpc/platforms/ps3/device-init.c
> +++ b/arch/powerpc/platforms/ps3/device-init.c
> @@ -770,7 +770,7 @@ static struct task_struct *probe_task;
>  
>  static int ps3_probe_thread(void *data)
>  {
> -	struct ps3_notification_device dev;
> +	static struct ps3_notification_device dev;
>  	int res;
>  	unsigned int irq;
>  	u64 lpar;

Seems fine.

Acked-by: Geoff Levand <geoff@...radead.org>