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: Sun, 05 Sep 2010 11:20:45 +0200 From: Tejun Heo <tj@...nel.org> To: Brian Gerst <brgerst@...il.com> CC: x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] x86, percpu: Optimize this_cpu_ptr Hello, On 09/04/2010 07:21 PM, Brian Gerst wrote: > diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h > index cd28f9a..d854438 100644 > --- a/arch/x86/include/asm/percpu.h > +++ b/arch/x86/include/asm/percpu.h > @@ -47,6 +47,15 @@ > #ifdef CONFIG_SMP > #define __percpu_arg(x) "%%"__stringify(__percpu_seg)":%P" #x > #define __my_cpu_offset percpu_read(this_cpu_off) > +#define __this_cpu_ptr(ptr) \ > +({ \ > + typeof(ptr) __ptr = (ptr); \ > + __verify_pcpu_ptr(ptr); \ > + asm volatile("add " __percpu_arg(1) ", %0" \ > + : "+r" (__ptr) \ > + : "m" (this_cpu_off)); \ > + __ptr; \ > +}) Great, thanks for doing this, but can you please comment on what __this_cpu_ptr() optimizes above? Something similar to the patch description but shorter. Thanks. -- tejun -- 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