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

From: David Howells
Date: Fri Jun 19 2009 - 06:59:41 EST

Mike Frysinger <vapier@xxxxxxxxxx> 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@xxxxxxxxxx>

Acked-by: David Howells <dhowells@xxxxxxxxxx>
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