linux-kernel - Re: [PATCH 0/9] oprofile: port to the new ring buffer

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Date:	Tue, 16 Dec 2008 15:49:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Robert Richter <robert.richter@....com>
Cc:	linux-kernel@...r.kernel.org, oprofile-list@...ts.sourceforge.net,
	mingo@...e.hu, rostedt@...dmis.org
Subject: Re: [PATCH 0/9] oprofile: port to the new ring buffer

On Thu, 11 Dec 2008 17:41:54 +0100
Robert Richter <robert.richter@....com> wrote:

> This patch set ports cpu buffers in oprofile to the new ring buffer
> provided by the tracing framework.

alpha allmodconfig:

arch/alpha/oprofile/../../../drivers/oprofile/buffer_sync.c: In function 'sync_buffer':
arch/alpha/oprofile/../../../drivers/oprofile/buffer_sync.c:398: warning: 'offset' may be used uninitialized in this function
make[1]: *** [arch/alpha/oprofile/../../../drivers/oprofile/buffer_sync.o] Error 1                                                    

because stupid gcc thinks that

	lookup_dcookie(mm, s->eip, &offset);

didn't initialise `offset', and arch/alpha is compiled with -Werror.

I'm not sure what to do about that, apart from finding (or building) a
new alpha cross-compiler.

What a PITA.   I do so wish that someone would maintain a suite of
cross-compilers for kernel developers.
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