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15e64ef652
Add a lightweight spinlock check which uses only two instructions per spinlock call. It detects if a spinlock has been trashed by some memory corruption and then halts the kernel. It will not detect uninitialized spinlocks, for which CONFIG_DEBUG_SPINLOCK needs to be enabled. This lightweight spinlock check shouldn't influence runtime, so it's safe to enable it by default. The __ARCH_SPIN_LOCK_UNLOCKED_VAL constant has been choosen small enough to be able to be loaded by one LDI assembler statement. Signed-off-by: Helge Deller <deller@gmx.de>
12 lines
433 B
Text
12 lines
433 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 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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