diff options
| author | Helge Deller <deller@gmx.de> | 2023-08-09 09:21:58 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2023-08-10 17:32:09 +0200 |
| commit | a0f4b7879f2e14986200747d1b545e5daac8c624 (patch) | |
| tree | 90c0f9302627476b43a470ad87cb33d24ec27c35 /arch/parisc/Kconfig.debug | |
| parent | a027b2eca0b7e90b11a0b0ddfad0dc4068707799 (diff) | |
parisc: Fix lightweight spinlock checks to not break futexes
The lightweight spinlock checks verify that a spinlock has either value
0 (spinlock locked) and that not any other bits than in
__ARCH_SPIN_LOCK_UNLOCKED_VAL is set.
This breaks the current LWS code, which writes the address of the lock
into the lock word to unlock it, which was an optimization to save one
assembler instruction.
Fix it by making spinlock_types.h accessible for asm code, change the
LWS spinlock-unlocking code to write __ARCH_SPIN_LOCK_UNLOCKED_VAL into
the lock word, and add some missing lightweight spinlock checks to the
LWS path. Finally, make the spinlock checks dependend on DEBUG_KERNEL.
Noticed-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Tested-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org # v6.4+
Fixes: 15e64ef6520e ("parisc: Add lightweight spinlock checks")
Diffstat (limited to 'arch/parisc/Kconfig.debug')
| -rw-r--r-- | arch/parisc/Kconfig.debug | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/parisc/Kconfig.debug b/arch/parisc/Kconfig.debug index 1401e4c5fe5f..bf2b21b96f0b 100644 --- a/arch/parisc/Kconfig.debug +++ b/arch/parisc/Kconfig.debug @@ -2,7 +2,7 @@ # config LIGHTWEIGHT_SPINLOCK_CHECK bool "Enable lightweight spinlock checks" - depends on SMP && !DEBUG_SPINLOCK + depends on DEBUG_KERNEL && SMP && !DEBUG_SPINLOCK default y help Add checks with low performance impact to the spinlock functions |