linux-kernel - Re: [PATCH v2 6/9] rcu: use __this_cpu_read helper instead of per_cpu_ptr(p, raw_smp_processor

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Message-ID: <0000013ad10bc571-9f707c9b-14e3-4382-a472-2a1aaa3fb384-000000@email.amazonses.com>
Date:	Mon, 5 Nov 2012 14:49:00 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Shan Wei <shanwei88@...il.com>
cc:	paulmck@...ux.vnet.ibm.com, dipankar@...ibm.com,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] rcu: use __this_cpu_read helper instead of
 per_cpu_ptr(p, raw_smp_processor_id())

On Sun, 4 Nov 2012, Shan Wei wrote:

>  __this_cpu_read<-----------------2
> 0000000000000000 <init_module>:
>    0:   55                      push   %rbp
>    1:   31 c0                   xor    %eax,%eax
>    3:   48 89 e5                mov    %rsp,%rbp
>    6:   48 83 ec 10             sub    $0x10,%rsp
>    a:   c9                      leaveq
>    b:   c3                      retq

?? There should be an operation using gs: here. This does not look
like code that includes a __this_cpu_read().

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