Jeff Mahoney 8faa545b70 tracing: Fix ftrace_event_call alignment for use with gcc 4.5 ... commit 86c38a31aa upstream. GCC 4.5 introduces behavior that forces the alignment of structures to use the largest possible value. The default value is 32 bytes, so if some structures are defined with a 4-byte alignment and others aren't declared with an alignment constraint at all - it will align at 32-bytes. For things like the ftrace events, this results in a non-standard array. When initializing the ftrace subsystem, we traverse the _ftrace_events section and call the initialization callback for each event. When the structures are misaligned, we could be treating another part of the structure (or the zeroed out space between them) as a function pointer. This patch forces the alignment for all the ftrace_event_call structures to 4 bytes. Without this patch, the kernel fails to boot very early when built with gcc 4.5. It's trivial to check the alignment of the members of the array, so it might be worthwhile to add something to the build system to do that automatically. Unfortunately, that only covers this case. I've asked one of the gcc developers about adding a warning when this condition is seen. Cc: stable@kernel.org Signed-off-by: Jeff Mahoney <jeffm@suse.com> LKML-Reference: <4B85770B.6010901@suse.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Cc: Andreas Radke <a.radke@arcor.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2010-05-12 14:57:14 -07:00
..
acpi	ACPI: don't cond_resched if irq is disabled	2010-01-28 15:00:26 -08:00
asm-generic	fcntl: rename F_OWNER_GID to F_OWNER_PGRP	2009-11-17 17:40:33 -08:00
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2009-09-11 09:38:37 -07:00
drm	drm/radeon/kms: add FireMV 2400 PCI ID.	2010-04-26 07:41:26 -07:00
keys	RxRPC: Use uX/sX rather than uintX_t/intX_t types	2009-09-16 00:01:13 -07:00
linux	tracing: Fix ftrace_event_call alignment for use with gcc 4.5	2010-05-12 14:57:14 -07:00
math-emu
media	V4L/DVB (13019): video: initial support for ADV7180	2009-09-19 00:53:39 -03:00
mtd
net	mac80211: Retry null data frame for power save	2010-04-01 15:58:52 -07:00
pcmcia	PM / yenta: Split resume into early and late parts (rev. 4)	2009-11-03 10:54:58 +01:00
rdma	trivial: fix typo "to to" in multiple files	2009-09-21 15:14:55 +02:00
rxrpc
scsi	SCSI: fc-transport: Use packed modifier for fc_bsg_request structure.	2010-04-26 07:41:30 -07:00
sound
trace	tracing: Fix ftrace_event_call alignment for use with gcc 4.5	2010-05-12 14:57:14 -07:00
video	davinci-fb-frame-buffer-driver-for-ti-da8xx-omap-l1xx-v4	2009-09-23 07:39:51 -07:00
xen
Kbuild