linux-kernel - Re: SyS symbol munging.

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Date:	Fri, 10 May 2013 12:35:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: SyS symbol munging.

On Fri, 10 May 2013 15:24:17 -0400 Dave Jones <davej@...hat.com> wrote:

> On Fri, May 10, 2013 at 12:14:54PM -0700, Andrew Morton wrote:
> 
>  > [  163.953629] Call Trace:
>  > [  163.957706]  [<ffffffff812be322>] ipcget+0x182/0x380
>  > [  163.962123]  [<ffffffff810b99a5>] ?trace_hardirqs_on_caller+0x115/0x1e0
>  > [  163.966752]  [<ffffffff812c559a>] SyS_shmget+0x5a/0x60
>  > [  163.971163]  [<ffffffff812c47e0>] ? shm_close+0x140/0x140
>  > [  163.975590]  [<ffffffff812c3e60>] ? shm_release+0x50/0x50
>  > [  163.979991]  [<ffffffff812c3df0>] ? shm_get_unmapped_area+0x20/0x20
>  > [  163.984499]  [<ffffffff816caa14>] tracesys+0xdd/0xe2
>  
> This has been bugging me for a while.
> What's changing sys_shmget to SyS_shmget in that trace ? And why ?
> 

nm vmlinux | grep SyS

That's the actual name of the function definition which the C compiler
sees.  It's emitted by SYSCALL_DEFINE, cooked up by all the macro goop
in include/linux/syscalls.h.

I forget who did this initially and peeling back those layers with git
is tiresome.
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