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24555c3794
commita0f4b7879fupstream. 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>
12 lines
449 B
Text
12 lines
449 B
Text
# SPDX-License-Identifier: GPL-2.0
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#
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config LIGHTWEIGHT_SPINLOCK_CHECK
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bool "Enable lightweight spinlock checks"
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depends on DEBUG_KERNEL && SMP && !DEBUG_SPINLOCK
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default y
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help
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Add checks with low performance impact to the spinlock functions
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to catch memory overwrites at runtime. For more advanced
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spinlock debugging you should choose the DEBUG_SPINLOCK option
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which will detect unitialized spinlocks too.
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If unsure say Y here.
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