linux-kernel - Re: [PATCH] proc: fix kflags to uflags copying in /proc/kpageflags

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Date:	Wed, 11 Mar 2009 09:23:58 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"stable@...nel.org" <stable@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matt Mackall <mpm@...enic.com>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] proc: fix kflags to uflags copying in /proc/kpageflags

On Wed, Mar 11, 2009 at 03:17:58AM +0200, KOSAKI Motohiro wrote:
> > Fix kpf_copy_bit(src,dst) to be kpf_copy_bit(dst,src) to match the
> > actual call patterns, e.g. kpf_copy_bit(kflags, KPF_LOCKED, PG_locked).
> > 
> > This misplacement of src/dst only affected reporting of PG_writeback,
> > PG_reclaim and PG_buddy. For others kflags==uflags so not affected.
> > 
> > Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> > ---
> > 
> > This is a tested and trivial no-side-effect fix.
> > I'd suggest it for 2.6.29-rc7 and 2.6.28.X kernels.
> > 
> > diff --git a/fs/proc/page.c b/fs/proc/page.c
> > index 2d13451..e998383 100644
> > --- a/fs/proc/page.c
> > +++ b/fs/proc/page.c
> > @@ -80,7 +80,7 @@ static const struct file_operations proc_kpagecount_operations = {
> >  #define KPF_RECLAIM    9
> >  #define KPF_BUDDY     10
> >  
> > -#define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
> > +#define kpf_copy_bit(flags, dstpos, srcpos) (((flags >> srcpos) & 1) << dstpos)
> 
> Good catch! :)
> 	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

Thank you :)

> 
> but don't worry. the number of this interface user is very few.

Yeah, so few users that I have to write the tools by myself ;-)

Thanks,
Fengguang

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