linux/arch/ia64
Tony Luck f574c84319 [IA64] fix siglock
When ia64 converted to using ticket locks, an inline implementation
of trylock/unlock in fsys.S was missed.  This was not noticed because
in most circumstances it simply resulted in using the slow path because
the siglock was apparently not available (under old spinlock rules).

Problems occur when the ticket spinlock has value 0x0 (when first
initialised, or when it wraps around). At this point the fsys.S
code acquires the lock (changing the 0x0 to 0x1. If another process
attempts to get the lock at this point, it will change the value from
0x1 to 0x2 (using new ticket lock rules). Then the fsys.S code will
free the lock using old spinlock rules by writing 0x0 to it. From
here a variety of bad things can happen.

Signed-off-by: Tony Luck <tony.luck@intel.com>
2010-09-09 15:16:56 -07:00
..
configs defconfig reduction 2010-08-14 22:26:53 +02:00
dig x86, ia64: convert to use generic dma_map_ops struct 2009-01-06 14:06:57 +01:00
hp Input: sysrq - drop tty argument form handle_sysrq() 2010-08-21 00:34:45 -07:00
include/asm [IA64] Fix build error: conflicting types for ‘sys_execve’ 2010-08-18 10:17:44 -07:00
kernel [IA64] fix siglock 2010-09-09 15:16:56 -07:00
kvm Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-08-04 15:31:02 -07:00
lib [IA64] fix csum_ipv6_magic() 2009-09-02 09:14:48 -07:00
mm [IA64] Fix spinaphore down_spin() 2010-06-30 10:46:16 -07:00
oprofile [IA64] implement ticket locks for Itanium 2009-09-25 08:42:16 -07:00
pci ACPI: pci_root: pass acpi_pci_root to arch-specific scan 2010-04-04 00:29:53 -04:00
scripts scripts: change scripts to use system python instead of env 2010-02-02 14:33:56 +01:00
sn Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2010-08-06 11:44:36 -07:00
uv [IA64] wrong attribute of HUB chip written in uv_setup() 2010-02-26 11:20:41 -08:00
xen Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
install.sh kbuild: use INSTALLKERNEL to select customized installkernel script 2009-09-20 12:18:14 +02:00
Kconfig topology: alternate fix for ia64 tiger_defconfig build breakage 2010-08-09 20:44:57 -07:00
Kconfig.debug
Makefile Merge commit 'v2.6.35' into kbuild/kbuild 2010-08-04 13:59:13 +02:00
module.lds