lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 19 Jun 2014 09:29:52 -0500 (CDT) From: Christoph Lameter <cl@...two.org> To: Tejun Heo <tj@...nel.org> cc: Rasmus Villemoes <linux@...musvillemoes.dk>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] mm: percpu: micro-optimize round-to-even On Thu, 19 Jun 2014, Tejun Heo wrote: > On Thu, Jun 19, 2014 at 12:02:29PM +0200, Rasmus Villemoes wrote: > > This change shaves a few bytes off the generated code. > > > > Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk> > > --- > > mm/percpu.c | 3 +-- > > 1 file changed, 1 insertion(+), 2 deletions(-) > > > > diff --git a/mm/percpu.c b/mm/percpu.c > > index 2ddf9a9..978097f 100644 > > --- a/mm/percpu.c > > +++ b/mm/percpu.c > > @@ -720,8 +720,7 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved) > > if (unlikely(align < 2)) > > align = 2; > > > > - if (unlikely(size & 1)) > > - size++; > > + size += size & 1; > > I'm not gonna apply this. This isn't that hot a path. It's not > worthwhile to micro optimize code like this. Dont we have an ALIGN() macro for this? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists