From: Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 2 Aug 2005 04:11:47 +0000 (-0700)
Subject: [PATCH] Module per-cpu alignment cannot always be met
X-Git-Tag: v2.6.13-rc5~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=842bbaaa7394820c8f1fe0629cd15478653caf86;p=pandora-kernel.git

[PATCH] Module per-cpu alignment cannot always be met

The module code assumes noone will ever ask for a per-cpu area more than
SMP_CACHE_BYTES aligned.  However, as these cases show, gcc asks sometimes
asks for 32-byte alignment for the per-cpu section on a module, and if
CONFIG_X86_L1_CACHE_SHIFT is 4, we hit that BUG_ON().  This is obviously an
unusual combination, as there have been few reports, but better to warn
than die.

See:
	http://www.ussg.iu.edu/hypermail/linux/kernel/0409.0/0768.html

And more recently:
	http://bugs.gentoo.org/show_bug.cgi?id=97006

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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