linux-kernel - Re: [PATCH v3] staging: lustre: fix sparse warning on LPROC_SEQ

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Message-ID: <20141224135346.GA6304@lenderer>
Date:	Wed, 24 Dec 2014 14:53:47 +0100
From:	Tristan Lelong <tristan@...ong.xyz>
To:	oleg.drokin@...el.com, andreas.dilger@...el.com,
	gregkh@...uxfoundation.org, askb23@...il.com,
	john.hammond@...el.com, gdonald@...il.com, anhlq2110@...il.com,
	fabio.falzoi84@...il.com, oort10@...il.com, agimenez@...valve.es,
	rupran@...server.de, surya.seetharaman9@...il.com,
	Julia.Lawall@...6.fr, joe@...ches.com, a.terekhov@...il.com,
	liang.zhen@...el.com, vthakkar1994@...il.com, amk@...y.com,
	srikrishanmalik@...il.com, rd@...ekdostal.com, bergwolf@...il.com,
	dan.carpenter@...cle.com, paul.gortmaker@...driver.com,
	tapaswenipathak@...il.com, email@...istophjaeger.info,
	uja.ornl@...il.com, brilliantov@...ox.ru, dmitry.eremin@...el.com
Cc:	HPDD-discuss@...ts.01.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: lustre: fix sparse warning on LPROC_SEQ_FOPS
 macros

On Sat, Dec 06, 2014 at 04:03:22PM -0800, Tristan Lelong wrote:
> This patch fix a sparse warning in lustre sources
> 
> warning: incorrect type in argument 1 (different address spaces)
>     expected void [noderef] <asn:1>*to
>     got char *<noident>
> 
> This is done by adding the missing __user attribute on userland pointers inside the LPROC_SEQ_FOPS like macros:
> - LPROC_SEQ_FOPS
> - LPROC_SEQ_FOPS_RW_TYPE
> - LPROC_SEQ_FOPS_WR_ONLY
> - LDLM_POOL_PROC_WRITER
> 
> The patch also updates all the functions that are used by this macro:
> - lprocfs_wr_*
> - *_seq_write
> 
> as well as some helpers used by the previously modified functions (otherwise fixing the sparse warning add some new ones):
> - lprocfs_write_frac_helper
> - lprocfs_write_helper
> - lprocfs_write_u64_helper
> 
> The patch also fixes one __user pointer direct dereference by strncmp in function fld_proc_hash_seq_write.
> 
> Signed-off-by: Tristan Lelong <tristan@...ong.xyz>
> ---
> Changes in v2:
>         Use dynamic allocation for 'name' variable instead of having it on the stack, per Greg K-H suggestion.
> 
> Changes in v3:
> 	Rename added variable from 'name' to 'fh_name'.
> 	Revert to a stack declaration of 'fh_name' since it is not 80 bytes but only 8, per Andreas Dilger comment.

Hi,

I just wanted to follow up on that patch to see if anybody had any comment.

Thanks

Regards
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