linux-kernel - BUG: perf error on syscalls for powerpc64.

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Date:	Thu, 16 Jul 2015 13:57:17 +0800
From:	Zumeng Chen <zumeng.chen@...il.com>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	linux-kernel@...r.kernel.org, romeo.cane.ext@...iant.com,
	imunsie@....ibm.com, mpe@...erman.id.au, paulus@...ba.org,
	benh@...nel.crashing.org
Subject: BUG: perf error on syscalls for powerpc64.

Hi All,

1028ccf5 did a change for sys_call_table from a pointer to an array of
unsigned long, I think it's not proper, here is my reason:

sys_call_table defined as a label in assembler should be pointer array
rather than an array as described in 1028ccf5. If we defined it as an
array, then arch_syscall_addr will return the address of sys_call_table[],
actually the content of sys_call_table[] is demanded by arch_syscall_addr.
so 'perf list' will ignore all syscalls since find_syscall_meta will
return null
in init_ftrace_syscalls because of the wrong arch_syscall_addr.

Did I miss something, or Gcc compiler has done something newer ?

Cheers,
Zumeng
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