arm64: ensure __raw_read_system_reg() is self-consistent

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We recently discovered that __raw_read_system_reg() erroneously mapped
sysreg IDs to the wrong registers.

To ensure that we don't get hit by a similar issue in future, this patch
makes __raw_read_system_reg() use a macro for each case statement,
ensuring that each case reads the correct register.

To ensure that this patch hasn't introduced an issue, I've binary-diffed
the object files before and after this patch. No code or data sections
differ (though some debug section differ due to line numbering
changing).

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

...

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Mark Rutland 2017-02-02 17:32:15 +00:00 • committed by Will Deacon

parent 7d0928f18b

commit 965861d66f

1 changed files with 34 additions and 30 deletions

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arch/arm64/kernel/cpufeature.c

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