linux-kernel - Re: [PATCH] fs/fuse/dev.c: use zero_user

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Message-ID: <91b13c310707200312j17ec110bm20c100e5861b1758@mail.gmail.com>
Date:	Fri, 20 Jul 2007 18:12:53 +0800
From:	"rae l" <crquan@...il.com>
To:	"Dave Young" <hidave.darkstar@...il.com>
Cc:	"Miklos Szeredi" <miklos@...redi.hu>,
	fuse-devel@...ts.sourceforge.net, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs/fuse/dev.c: use zero_user_page instead

On 7/20/07, Dave Young <hidave.darkstar@...il.com> wrote:
> > -       if (page && zeroing && count < PAGE_SIZE) {
> > -               void *mapaddr = kmap_atomic(page, KM_USER1);
> > -               memset(mapaddr, 0, PAGE_SIZE);
> > -               kunmap_atomic(mapaddr, KM_USER1);
> > -       }
> > +       if (page && zeroing && count < PAGE_SIZE)
> > +               zero_user_page(page, 0, PAGE_SIZE, KM_USER1);
> Why clear all page? IMHO,only count bytes need to be cleared.
The original one is memset(mapaddr, 0, PAGE_SIZE), namely clear the whole page.

-- 
Denis Cheng
Linux Application Developer

"One of my most productive days was throwing away 1000 lines of code."
 - Ken Thompson.
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