parisc: Add lightweight spinlock checks

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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>

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This commit is contained in:

Helge Deller 2023-05-22 15:11:16 +02:00

parent b6405f0829

commit 15e64ef652

4 changed files with 61 additions and 7 deletions

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11

arch/parisc/Kconfig.debug

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39

arch/parisc/include/asm/spinlock.h

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8

arch/parisc/include/asm/spinlock_types.h

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10

arch/parisc/kernel/traps.c

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