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Message-Id: <FA3D9AE9-9D1E-4232-87DE-42F21B408B24@gmail.com>
Date: Fri, 31 Jul 2015 17:32:02 +0800
From: yalin wang <yalin.wang2010@...il.com>
To: "Kirill A. Shutemov" <kirill@...temov.name>
Cc: Viresh Kumar <viresh.kumar@...aro.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linaro-kernel@...ts.linaro.org,
open list <linux-kernel@...r.kernel.org>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
David Rientjes <rientjes@...gle.com>,
Ebru Akagunduz <ebru.akagunduz@...il.com>,
Johannes Weiner <hannes@...xchg.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
"open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>,
Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 14/15] mm: Drop unlikely before IS_ERR(_OR_NULL)
> On Jul 31, 2015, at 16:56, Kirill A. Shutemov <kirill@...temov.name> wrote:
>
> On Fri, Jul 31, 2015 at 02:08:34PM +0530, Viresh Kumar wrote:
>> IS_ERR(_OR_NULL) already contain an 'unlikely' compiler flag and there
>> is no need to do that again from its callers. Drop it.
>>
>> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>
> --
> Kirill A. Shutemov
> --
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search in code, there are lots of using like this , does need add this check into checkpatch ?
# grep -r 'likely.*IS_ERR' .
./include/linux/blk-cgroup.h: if (unlikely(IS_ERR(blkg)))
./fs/nfs/objlayout/objio_osd.c: if (unlikely(IS_ERR(od))) {
./fs/cifs/readdir.c: if (unlikely(IS_ERR(dentry)))
./fs/ext4/extents.c: if (unlikely(IS_ERR(bh))) {
./fs/ext4/extents.c: if (unlikely(IS_ERR(path1))) {
./fs/ext4/extents.c: if (unlikely(IS_ERR(path2))) {
./fs/ext4/namei.c: if (unlikely(IS_ERR(bh))) {
./fs/ntfs/lcnalloc.c: if (likely(page && !IS_ERR(page))) {
./fs/ntfs/runlist.c: if (likely(!IS_ERR(old_rl)))
./fs/ntfs/mft.c: if (likely(!IS_ERR(page))) {
./fs/ntfs/mft.c: if (likely(!IS_ERR(m)))
./fs/ntfs/mft.c: if (likely(!IS_ERR(m))) {
./fs/ntfs/mft.c: if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) {
./fs/ntfs/mft.c: if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) {
./fs/ntfs/mft.c: if (likely(!IS_ERR(rl2)))
./fs/ntfs/inode.c: if (unlikely(err || IS_ERR(m))) {
./fs/ntfs/namei.c: if (likely(!IS_ERR(dent_inode))) {
./fs/ntfs/super.c: if (unlikely(IS_ERR(tmp_ino) || is_bad_inode(tmp_ino))) {
./fs/namei.c: if (unlikely(IS_ERR(s)))
./fs/namei.c: if (unlikely(IS_ERR(filename)))
./fs/gfs2/dir.c: if (unlikely(dent == NULL || IS_ERR(dent))) {
./fs/ecryptfs/inode.c: if (unlikely(IS_ERR(ecryptfs_inode))) {
./fs/ncpfs/dir.c: if (unlikely(IS_ERR(newdent)))
./fs/proc/proc_sysctl.c: if (unlikely(IS_ERR(subdir))) {
Binary file ./.git/objects/pack/pack-4a5df920db8b8d9df9a91893c9567b4b2f15b782.pack matches
./drivers/target/tcm_fc/tfc_cmd.c: if (unlikely(IS_ERR(fp))) {
./drivers/thermal/intel_powerclamp.c: if (likely(!IS_ERR(thread))) {
./drivers/thermal/intel_powerclamp.c: if (likely(!IS_ERR(thread))) {
./drivers/gpu/drm/vmwgfx/vmwgfx_drv.c: if (unlikely(IS_ERR(vmaster))) {
./drivers/gpu/drm/vmwgfx/vmwgfx_context.c: if (unlikely(IS_ERR(uctx->man))) {
./drivers/gpu/drm/ttm/ttm_tt.c: if (unlikely(IS_ERR(swap_storage))) {
./drivers/gpu/drm/ttm/ttm_tt.c: if (unlikely(IS_ERR(to_page))) {
./drivers/scsi/bnx2fc/bnx2fc_fcoe.c: if (likely(!IS_ERR(thread))) {
./drivers/scsi/bnx2i/bnx2i_init.c: if (likely(!IS_ERR(thread))) {
./drivers/scsi/fcoe/fcoe.c: if (likely(!IS_ERR(thread))) {
./drivers/base/power/opp.c: if (unlikely(IS_ERR_OR_NULL(dev))) {
./drivers/base/power/opp.c: if (unlikely(IS_ERR_OR_NULL(tmp_opp)) || !tmp_opp->available)
./drivers/base/power/opp.c: if (unlikely(IS_ERR_OR_NULL(tmp_opp)) || !tmp_opp->available)
./drivers/tty/serial/serial_core.c: if (likely(!IS_ERR(tty_dev))) {
./drivers/rtc/rtc-bfin.c: if (unlikely(IS_ERR(rtc->rtc_dev)))
./drivers/rtc/rtc-gemini.c: if (likely(IS_ERR(rtc->rtc_dev)))
./drivers/rtc/interface.c: if (unlikely(IS_ERR_OR_NULL(rtc)))
./drivers/md/dm-snap-persistent.c: if (unlikely(IS_ERR(area))) {
./drivers/md/dm-verity.c: if (unlikely(IS_ERR(data)))
./drivers/md/persistent-data/dm-block-manager.c: if (unlikely(IS_ERR(p)))
./drivers/md/persistent-data/dm-block-manager.c: if (unlikely(IS_ERR(p)))
./drivers/md/persistent-data/dm-block-manager.c: if (unlikely(IS_ERR(p)))
./drivers/md/persistent-data/dm-block-manager.c: if (unlikely(IS_ERR(p)))
./drivers/staging/lustre/include/linux/libcfs/libcfs.h: if (unlikely(IS_ERR(ptr) || ptr == NULL))
./drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c: if (likely(!IS_ERR(pfmr))) {
./drivers/staging/lustre/lustre/obdclass/lu_object.c: if (unlikely(IS_ERR(o)))
./drivers/staging/lustre/lustre/obdclass/lu_object.c: if (unlikely(IS_ERR(o)))
./drivers/staging/lustre/lustre/obdclass/lu_object.c: if (likely(IS_ERR(shadow) && PTR_ERR(shadow) == -ENOENT)) {
./drivers/staging/lustre/lustre/obdclass/lu_object.c: if (unlikely(IS_ERR(value)))
./drivers/staging/android/ashmem.c: if (unlikely(IS_ERR(vmfile))) {
./drivers/input/mouse/alps.c: } else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
./drivers/net/ethernet/marvell/sky2.c: if (unlikely(status & Y2_IS_ERROR))
./drivers/net/ethernet/ti/netcp_core.c: if (unlikely(IS_ERR_OR_NULL(desc))) {
./drivers/net/ethernet/ti/netcp_core.c: if (unlikely(IS_ERR_OR_NULL(ndesc))) {
./drivers/devfreq/devfreq.c: if (unlikely(IS_ERR_OR_NULL(dev))) {
./drivers/devfreq/devfreq.c: if (unlikely(IS_ERR_OR_NULL(name))) {
./drivers/misc/c2port/core.c: if (unlikely(IS_ERR(c2dev->dev))) {
./net/socket.c: if (unlikely(IS_ERR(file))) {
./net/socket.c: if (likely(!IS_ERR(newfile))) {
./net/socket.c: if (unlikely(IS_ERR(newfile1))) {
./net/socket.c: if (unlikely(IS_ERR(newfile))) {
./net/openvswitch/datapath.c: if (unlikely(IS_ERR(reply))) {
./net/openvswitch/datapath.c: if (likely(!IS_ERR(reply))) {
./net/sctp/socket.c: if (unlikely(IS_ERR(newfile))) {
./mm/huge_memory.c: if (unlikely(IS_ERR(khugepaged_thread))) {
Thanks
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