linux-kernel - Re: [PATCH][GIT PULL][for 2.6.35] tracing: Add alignment to syscall metadata declarations

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Date:	Fri, 09 Jul 2010 17:05:50 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Zeev Tarantov <zeev.tarantov@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maciej@...ispam.struernethosting.dk
Subject: Re: [PATCH][GIT PULL][for 2.6.35] tracing: Add alignment to
 syscall metadata declarations

On Fri, 2010-07-09 at 22:53 +0200, Sam Ravnborg wrote:

> But in this case we have no control of the value of "." (current address)
> when we have processed (_ftrace_events) so it may even be at a 2 byte boundary.
> The linker will add padding as needed to satisfy the alignmnet of
> __syscalls_metadata - but that padding will be inbetween "." and the first
> member in __syscalls_metadata.

Fine, but this is a separate issue. I doubt the "ALIGN(8);" would have
helped us anyway. Remember what the issue we had:

ffffffff8173c438 <__start_syscalls_metadata>:
        ...

ffffffff8173c440 <__syscall_meta__mmap>:


__start_syscalls_metadata was already aligned to 8, but for some strange
reason, gcc decided to align the first member to 16.

-- Steve


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