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arm64: arm64_ftr_reg->name may not be a human-readable string 

The id argument of ARM64_FTR_REG_OVERRIDE() is used for two purposes:
one as the system register encoding (used for the sys_id field of
__ftr_reg_entry), and the other as the register name (stringified
and used for the name field of arm64_ftr_reg), which is debug
information. The id argument is supposed to be a macro that
indicates an encoding of the register (eg. SYS_ID_AA64PFR0_EL1, etc).

ARM64_FTR_REG(), which also has the same id argument,
uses ARM64_FTR_REG_OVERRIDE() and passes the id to the macro.
Since the id argument is completely macro-expanded before it is
substituted into a macro body of ARM64_FTR_REG_OVERRIDE(),
the stringified id in the body of ARM64_FTR_REG_OVERRIDE is not
a human-readable register name, but a string of numeric bitwise
operations.

Fix this so that human-readable register names are available as
debug information.

Fixes: 8f266a5d87 ("arm64: cpufeature: Add global feature override facility")
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211101045421.2215822-1-reijiw@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Reiji Watanabe 2021-10-31 21:54:21 -07:00 committed by Will Deacon
parent e6359798f6
commit 9dc232a8ab
1 changed files with 7 additions and 3 deletions
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10
arch/arm64/kernel/cpufeature.c
View File

@ -573,15 +573,19 @@ static const struct arm64_ftr_bits ftr_raz[] = {
ARM64_FTR_END,
};
#define ARM64_FTR_REG_OVERRIDE(id, table, ovr) { \
#define __ARM64_FTR_REG_OVERRIDE(id_str, id, table, ovr) { \
.sys_id = id, \
.reg = &(struct arm64_ftr_reg){ \
.name = #id, \
.name = id_str, \
.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_OVERRIDE(#id, id, table, ovr)
#define ARM64_FTR_REG(id, table) \
__ARM64_FTR_REG_OVERRIDE(#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;