From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: md:Add break if find. Date: Wed, 14 Mar 2012 13:06:15 +1100 Message-ID: <20120314130615.7e5dbd42@notabene.brown> References: <201203131328071710700@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/tFS6pWk/rMfn3h95lsJ.uKc"; protocol="application/pgp-signature" Return-path: In-Reply-To: <201203131328071710700@gmail.com> Sender: linux-raid-owner@vger.kernel.org To: majianpeng Cc: linux-raid List-Id: linux-raid.ids --Sig_/tFS6pWk/rMfn3h95lsJ.uKc Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 13 Mar 2012 13:28:12 +0800 "majianpeng" wrot= e: > >From 6e04c2374db7fc34ccbf9f37f85e735a349c816c Mon Sep 17 00:00:00 2001 > From: majianpeng > Date: Tue, 13 Mar 2012 13:26:25 +0800 > Subject: [PATCH] md:Add break if find. >=20 >=20 > Signed-off-by: majianpeng > --- > drivers/md/raid5.c | 4 +++- > 1 files changed, 3 insertions(+), 1 deletions(-) >=20 > diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c > index 360f2b9..e05d9e5 100644 > --- a/drivers/md/raid5.c > +++ b/drivers/md/raid5.c > @@ -4369,8 +4369,10 @@ static inline sector_t sync_request(struct mddev *= mddev, sector_t sector_nr, int > * recovery aborts. > */ > for (i =3D 0; i < conf->raid_disks; i++) > - if (conf->disks[i].rdev =3D=3D NULL) > + if (conf->disks[i].rdev =3D=3D NULL) { > still_degraded =3D 1; > + break; > + } > =20 > bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degrade= d); > =20 Thanks - however I don't think I'll apply this one. It is a micro optimisation which only improve an uncommon case a little, but it makes the source code long and the generated machine code longer (by 32 bytes on x86_64). So I don't really think it is a win. Thanks, NeilBrown --Sig_/tFS6pWk/rMfn3h95lsJ.uKc Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBT1/9Fznsnt1WYoG5AQInDQ//adFAxCbEFcu4W6fmKVgPrs6qkZsRALMG IoAEhRcz7f2J/S93w8FuzrdnoNfR0OeFb/+0vLAyGg9cEzJWkp5DwNZADZayaZ9+ kdlB5q05adrZxyht2EkDVXHZ3C8dxIxoTmi6SzHcCa95aZgY1FYVIliSApGMUKsr AipAND2DdEmBOB/xJq3iYSHBkofPXwGKCz9qllghoYD4u3mRsUmfVzasSDpQ1zg6 bXxg7Iu9khrcGnGLGBIu/x8qZiIeBK0uY4iSFg6R73x1vrIucKMhs6Dl1QOsGnt0 lLQI87SwSzp1uk9QgqOpxYddyRpiSI8ffQtcCTK1XXL17xCEBa4OP1ZOxrsrAISr vdOnNxm3k3Uvgdc9cDkPnLcwOKQdRW5ALoOT7aMBws5uTiAPX9n1nW4YFGVWoYp7 UOwG/ukjIDeUePjZv/qxcyt8N8mlyJL8SYzAxYhAGwswK3WrKTET0jj4Ml9cngoW izJcJ/NUkV/1JMhZyWnmVP9esCU1j9tYJJ+KySyIuqpGSTgWnNDefiWF+VrbKOEy X2vSzD05gQHbg4TjzXx/yqQM6P7Bs4BLlY257Rd6mTlGAF1Max6O9Gm7tJoDKfYk Rg8bycpHt544+oBXUV3wXrYjWhBWXxhkN8Fk1Cnmm/OWuddm2VN/jMz7+oZ0z2vz sFo1VqT1qHQ= =CBaE -----END PGP SIGNATURE----- --Sig_/tFS6pWk/rMfn3h95lsJ.uKc--