From: Andrew Morton <akpm@linux-foundation.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andrea Arcangeli <aarcange@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
Simon Jeons <simon.jeons@gmail.com>,
Wanpeng Li <liwanp@linux.vnet.ibm.com>,
Hugh Dickins <hughd@google.com>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/6] mm: numa: Handle side-effects in count_vm_numa_events() for !CONFIG_NUMA_BALANCING
Date: Tue, 22 Jan 2013 14:40:24 -0800 [thread overview]
Message-ID: <20130122144024.8ded0f53.akpm@linux-foundation.org> (raw)
In-Reply-To: <1358874762-19717-4-git-send-email-mgorman@suse.de>
On Tue, 22 Jan 2013 17:12:39 +0000
Mel Gorman <mgorman@suse.de> wrote:
> The current definitions for count_vm_numa_events() is wrong for
> !CONFIG_NUMA_BALANCING as the following would miss the side-effect.
>
> count_vm_numa_events(NUMA_FOO, bar++);
Stupid macros.
> There are no such users of count_vm_numa_events() but it is a potential
> pitfall. This patch fixes it and converts count_vm_numa_event() so that
> the definitions look similar.
Confused. The patch doesn't alter count_vm_numa_event(). No matter.
> --- a/include/linux/vmstat.h
> +++ b/include/linux/vmstat.h
> @@ -85,7 +85,7 @@ static inline void vm_events_fold_cpu(int cpu)
> #define count_vm_numa_events(x, y) count_vm_events(x, y)
> #else
> #define count_vm_numa_event(x) do {} while (0)
> -#define count_vm_numa_events(x, y) do {} while (0)
> +#define count_vm_numa_events(x, y) do { (void)(y); } while (0)
> #endif /* CONFIG_NUMA_BALANCING */
>
> #define __count_zone_vm_events(item, zone, delta) \
--
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next prev parent reply other threads:[~2013-01-22 22:40 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 17:12 [PATCH 0/6] Follow up work on NUMA Balancing Mel Gorman
2013-01-22 17:12 ` [PATCH 1/6] mm: numa: Fix minor typo in numa_next_scan Mel Gorman
2013-01-22 17:12 ` [PATCH 2/6] mm: numa: Take THP into account when migrating pages for NUMA balancing Mel Gorman
2013-01-22 17:12 ` [PATCH 3/6] mm: numa: Handle side-effects in count_vm_numa_events() for !CONFIG_NUMA_BALANCING Mel Gorman
2013-01-22 22:40 ` Andrew Morton [this message]
2013-01-23 9:27 ` Mel Gorman
2013-01-22 17:12 ` [PATCH 4/6] mm: Move page flags layout to separate header Mel Gorman
2013-01-22 17:12 ` [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible Mel Gorman
2013-01-22 22:46 ` Andrew Morton
2013-01-23 13:17 ` Mel Gorman
2013-01-23 21:45 ` KOSAKI Motohiro
2013-01-23 13:18 ` [PATCH] mm: init: Report on last-nid information stored in page->flags Mel Gorman
2013-01-23 14:25 ` [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible Mel Gorman
2013-01-23 21:56 ` Andrew Morton
2013-01-24 10:55 ` [PATCH] mm: Rename page struct field helpers Mel Gorman
2013-01-29 4:39 ` Hugh Dickins
2013-01-30 11:58 ` Mel Gorman
2013-01-30 20:32 ` Hugh Dickins
2013-01-23 15:23 ` [PATCH] mm: uninline page_xchg_last_nid() Mel Gorman
2013-01-22 17:12 ` [PATCH 6/6] mm: numa: Cleanup flow of transhuge page migration Mel Gorman
2013-01-27 21:20 ` Hugh Dickins
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