linux-kernel - Re: [PATCH v10 1/3] scsi: sd: Fix build warning in sd_revalidate

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Message-ID: <6fa29979-7432-4587-814f-ac639868c216@kernel.org>
Date: Tue, 26 Aug 2025 14:10:52 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Abinash Singh <abinashsinghlalotra@...il.com>, bvanassche@....org
Cc: James.Bottomley@...senPartnership.com, linux-kernel@...r.kernel.org,
 linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
 stable@...r.kernel.org
Subject: Re: [PATCH v10 1/3] scsi: sd: Fix build warning in
 sd_revalidate_disk()

On 8/26/25 03:39, Abinash Singh wrote:
> A build warning was triggered due to excessive stack usage in
> sd_revalidate_disk():
> 
> drivers/scsi/sd.c: In function ‘sd_revalidate_disk.isra’:
> drivers/scsi/sd.c:3824:1: warning: the frame size of 1160 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> This is caused by a large local struct queue_limits (~400B) allocated
> on the stack. Replacing it with a heap allocation using kmalloc()
> significantly reduces frame usage. Kernel stack is limited (~8 KB),
> and allocating large structs on the stack is discouraged.
> As the function already performs heap allocations (e.g. for buffer),
> this change fits well.
> 
> Fixes: 804e498e0496 ("sd: convert to the atomic queue limits API")
> Cc: stable@...r.kernel.org
> Reviewed-by: Bart Van Assche <bvanassche@....org>
> Signed-off-by: Abinash Singh <abinashsinghlalotra@...il.com>

Reviewed-by: Damien Le Moal <dlemoal@...nel.org>


-- 
Damien Le Moal
Western Digital Research