linux-kernel - Re: 2.6.35 regression

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Message-ID: <1278620074.1537.123.camel@gandalf.stny.rr.com>
Date:	Thu, 08 Jul 2010 16:14:34 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Zeev Tarantov <zeev.tarantov@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: 2.6.35 regression

On Thu, 2010-07-08 at 21:53 +0300, Zeev Tarantov wrote:

> I've just uploaded the disassembly to bugzilla:
> https://bugzilla.kernel.org/show_bug.cgi?id=16353

Thanks I'll take a look.

> 
> With gcc 4.4.4 it boots and objdump's output starts with:
> Disassembly of section .data:
> 
> ffffffff81736898 <__start_syscalls_metadata>:
> ffffffff81736898:       a3 55 5f 81 ff ff ff    mov    %eax,0xffffffff815f55
> ffffffff8173689f:       ff 00
> ffffffff817368a1:       00 00                   add    %al,(%rax)
> ffffffff817368a3:       00 06                   add    %al,(%rsi)
> ffffffff817368a5:       00 00                   add    %al,(%rax)
> 
> With gcc 4.5.1 rev. 161655 objdump shows:
> Disassembly of section .data:
> 
> ffffffff8173c438 <__start_syscalls_metadata>:
>         ...
> 
> ffffffff8173c440 <__syscall_meta__mmap>:
> ffffffff8173c440:       2b ab 5f 81 ff ff       sub    -0x7ea1(%rbx),%ebp
> ffffffff8173c446:       ff                      (bad)
> ffffffff8173c447:       ff 00                   incl   (%rax)
> ffffffff8173c449:       00 00                   add    %al,(%rax)
> ffffffff8173c44b:       00 06                   add    %al,(%rsi)
> ffffffff8173c44d:       00 00                   add    %al,(%rax)
> 
> I don't know why -D, but that's the output.
> Hope it helps.

Without -D it wont disassemble data sections.

-- Steve


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