Commit a46cec12 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: Reserve HWCAP2_MTE as (1 << 18) 



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: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 0ae3b13a

arch/arm64/include/asm/hwcap.h

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm64/include/uapi/asm/hwcap.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

arch/arm64/kernel/cpuinfo.c

+1 −0
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ static const char *const hwcap_str[] = { 
	"dgh",

	"rng",

	"bti",

	/* reserved for "mte" */

	NULL

};

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