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SubjectRe: [PATCH] arm64: cpufeature: fix CPU features mismatch message
On Tue, 16 Nov 2021 21:59:22 +0000,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org> wrote:
>
> Fix cpp magic involved in ARM64_FTR_REG/ARM64_FTR_REG_OVERRIDE macros.
> Currently ARM64_FTR_REG parameters are expanded early, resulting in
> cryptic debug messages:
>
> [ 0.071123] CPU features: SANITY CHECK: Unexpected variation in (((3) << 19) | ((0) << 16) | ((0) << 12) | ((7) << 8) | ((0) << 5)). Boot CPU: 0x00022200101022, CPU4: 0x00022200101122
>
> Make ARM64_FTR_REG to be expanded before parameters, resulting in proper
> debug log:
>
> [ 0.071163] CPU features: SANITY CHECK: Unexpected variation in SYS_ID_AA64MMFR0_EL1. Boot CPU: 0x00022200101022, CPU4: 0x00022200101122
>
> Fixes: 8f266a5d878a ("arm64: cpufeature: Add global feature override facility")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
> arch/arm64/kernel/cpufeature.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 6ec7036ef7e1..72e3e3819eb4 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -573,15 +573,17 @@ static const struct arm64_ftr_bits ftr_raz[] = {
> ARM64_FTR_END,
> };
>
> -#define ARM64_FTR_REG_OVERRIDE(id, table, ovr) { \
> +#define __ARM64_FTR_REG(id, _name, table, ovr) { \
> .sys_id = id, \
> .reg = &(struct arm64_ftr_reg){ \
> - .name = #id, \
> + .name = _name, \
> .override = (ovr), \
> .ftr_bits = &((table)[0]), \
> }}
>
> -#define ARM64_FTR_REG(id, table) ARM64_FTR_REG_OVERRIDE(id, table, &no_override)
> +#define ARM64_FTR_REG_OVERRIDE(id, table, ovr) __ARM64_FTR_REG(id, #id, table, ovr)
> +
> +#define ARM64_FTR_REG(id, table) __ARM64_FTR_REG(id, #id, table, &no_override)
>
> struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override;
> struct arm64_ftr_override __ro_after_init id_aa64pfr1_override;

Please see commit 9dc232a8ab18 ("arm64: arm64_ftr_reg->name may not be
a human-readable string").

M.

--
Without deviation from the norm, progress is not possible.

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