Messages in this thread |  | | | Date | Wed, 15 Aug 2007 13:02:23 -0400 | | From | Chris Snook <> | | Subject | Re: [patch 1/2] i386: use asm() like the other atomic operations already do. |
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Herbert Xu wrote: > Andi Kleen <ak@suse.de> wrote: >>> My config with march=pentium-m and gcc (GCC) 4.1.2 (Gentoo 4.1.2): >>> text data bss dec hex filename >>> 3434150 249176 176128 3859454 3ae3fe atomic_normal/vmlinux >>> 3435308 249176 176128 3860612 3ae884 atomic_inlineasm/vmlinux >> What is the difference between atomic_normal and atomic_inlineasm? > > The inline asm stops certain optimisations from occuring. > > I'm still unconvinced why we need this because nobody has > brought up any examples of kernel code that legitimately > need this.
There's plenty of kernel code that *wants* this though. If we can reduce the need for register-clobbering barriers, shrink our binaries, shrink our code, improve performance, and avoid heisenbugs, I think it's a win, whether or not we *need* it.
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