David Vrabel 7a7546b377 x86: xen: size struct xen_spinlock to always fit in arch_spinlock_t ... If NR_CPUS < 256 then arch_spinlock_t is only 16 bits wide but struct xen_spinlock is 32 bits. When a spin lock is contended and xl->spinners is modified the two bytes immediately after the spin lock would be corrupted. This is a regression caused by 84eb950db1 (x86, ticketlock: Clean up types and accessors) which reduced the size of arch_spinlock_t. Fix this by making xl->spinners a u8 if NR_CPUS < 256. A BUILD_BUG_ON() is also added to check the sizes of the two structures are compatible. In many cases this was not noticable as there would often be padding bytes after the lock (e.g., if any of CONFIG_GENERIC_LOCKBREAK, CONFIG_DEBUG_SPINLOCK, or CONFIG_DEBUG_LOCK_ALLOC were enabled). The bnx2 driver is affected. In struct bnx2, phy_lock and indirect_lock may have no padding after them. Contention on phy_lock would corrupt indirect_lock making it appear locked and the driver would deadlock. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> CC: stable@kernel.org #only 3.2 Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		2012-01-24 12:10:19 -05:00
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alpha
arm	Merge branch 'fixes' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm	2011-11-20 14:34:58 -08:00
avr32
blackfin
cris
frv
h8300
hexagon
ia64
m32r
m68k
microblaze	microblaze: bury asm/namei.h	2011-11-21 16:48:28 -05:00
mips	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2011-11-15 22:44:45 -02:00
mn10300
openrisc
parisc
powerpc	Merge branch 'master' into x86/memblock	2011-11-28 09:46:22 -08:00
s390	Merge branch 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2011-11-20 14:57:43 -08:00
score
sh
sparc	Merge branch 'master' into x86/memblock	2011-11-28 09:46:22 -08:00
tile
um
unicore32	unicore32, exec: remove redundant set_fs(USER_DS)	2011-11-16 10:50:09 +08:00
x86	x86: xen: size struct xen_spinlock to always fit in arch_spinlock_t	2012-01-24 12:10:19 -05:00
xtensa
.gitignore
Kconfig