Helge Deller 24555c3794 parisc: Fix lightweight spinlock checks to not break futexes ... commit a0f4b7879f upstream. 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: 15e64ef652 ("parisc: Add lightweight spinlock checks") Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-08-16 18:32:18 +02:00
..
asm	parisc: Fix lightweight spinlock checks to not break futexes	2023-08-16 18:32:18 +02:00
uapi/asm	parisc: Align parisc MADV_XXX constants with all other architectures	2022-12-17 23:19:39 +01:00