arm64: cpufeature: Warn if we attempt to read a zero width field

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Add a WARN_ON_ONCE() when extracting a field if no width is specified. This
should never happen outside of development since it will be triggered with
or without the feature so long as the relevant ID register is present.  If
the warning triggers hope that the field was the standard 4 bits wide and
soldier on.

Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220307180900.3045812-1-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Mark Brown 2022-03-07 18:08:59 +00:00 • committed by Will Deacon

parent b8fc780137

commit f2c281204b

1 changed files with 2 additions and 0 deletions

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arch/arm64/include/asm/cpufeature.h

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