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arm64: Reserve HWCAP2_MTE as (1 << 18)

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While MTE is not supported in the upstream kernel yet, add a comment
that HWCAP2_MTE as (1 << 18) is reserved. Glibc makes use of it for the
resolving (ifunc) of the MTE-safe string routines.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2020-07-24 10:41:31 +01:00
parent 0ae3b13aab
commit a46cec12f4
3 changed files with 3 additions and 0 deletions
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1
arch/arm64/include/asm/hwcap.h
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@ -95,6 +95,7 @@
#define KERNEL_HWCAP_DGH __khwcap2_feature(DGH)
#define KERNEL_HWCAP_RNG __khwcap2_feature(RNG)
#define KERNEL_HWCAP_BTI __khwcap2_feature(BTI)
/* reserved for KERNEL_HWCAP_MTE __khwcap2_feature(MTE) */
/*
* This yields a mask that user programs can use to figure out what

1
arch/arm64/include/uapi/asm/hwcap.h
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@ -74,5 +74,6 @@
#define HWCAP2_DGH (1 << 15)
#define HWCAP2_RNG (1 << 16)
#define HWCAP2_BTI (1 << 17)
/* reserved for HWCAP2_MTE (1 << 18) */
#endif /* _UAPI__ASM_HWCAP_H */

1
arch/arm64/kernel/cpuinfo.c
View File

@ -93,6 +93,7 @@ static const char *const hwcap_str[] = {
"dgh",
"rng",
"bti",
/* reserved for "mte" */
NULL
};