linux-kernel - Re: [RFCv3 10/21] tcm: Add SPC-4 compliant Persistent Reservations (PR)

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Date:	Mon, 08 Nov 2010 13:27:13 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv3 10/21] tcm: Add SPC-4 compliant Persistent Reservations
	(PR)

On Mon, 2010-11-08 at 09:50 -0500, Christoph Hellwig wrote:
> Gcc on 32-bit x86 doesn't seem too happy about the stack usage here:
> 
> drivers/target/target_core_pr.c: In function '__core_scsi3_update_aptpl_buf':
> drivers/target/target_core_pr.c:1955: warning: the frame size of 1116 bytes is larger than 1024 bytes
> 

Hmmm, strange.  I am not seeing this on any of my 32-bit builds..  

Anyways, since __core_scsi3_update_aptpl_buf() is internally holding the
T10_RES(su_dev)->registration_lock while walking
T10_RES(su_dev)->registration_list to build the passed APTPL *buf, this
local scope tmp[1024] can be safetly converted to a
T10_RES(su_dev)->tmp_buf[] and drop the extra stack usage.

Thanks,

--nab

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