linux-kernel - Re: [PATCH] rmap: fixup page_referenced() for nommu systems

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Date:	Fri, 19 Jun 2009 11:58:32 +0100
From:	David Howells <dhowells@...hat.com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] rmap: fixup page_referenced() for nommu systems

Mike Frysinger <vapier@...too.org> wrote:

> After the recent changes that went into mm/vmscan.c to overhaul stuff, we
> ended up with these warnings on no-mmu systems:
> mm/vmscan.c: In function 'shrink_page_list':
> mm/vmscan.c:580: warning: unused variable 'vm_flags'
> mm/vmscan.c: In function 'shrink_active_list':
> mm/vmscan.c:1294: warning: 'vm_flags' may be used uninitialized in this function
> mm/vmscan.c:1242: note: 'vm_flags' was declared here
> 
> This is because the no-mmu function defines page_referenced() to work on
> the first argument only (the page).  It does not clear the vm_flags given
> to it because for no-mmu systems, they never actually get utilized.  Since
> that is no longer strictly true, we need to set vm_flags to 0 like everyone
> else so gcc can do proper dead code elimination without annoying us with
> unused warnings.
> 
> Signed-off-by: Mike Frysinger <vapier@...too.org>

Acked-by: David Howells <dhowells@...hat.com>
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