Commit 1d8f51d4 authored by Scott Wood's avatar Scott Wood Committed by Will Deacon
Browse files

arm/arm64: arch_timer: Use archdata to indicate vdso suitability 



Instead of comparing the name to a magic string, use archdata to
explicitly communicate whether the arch timer is suitable for
direct vdso access.

Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Acked-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarScott Wood <oss@buserror.net>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent f6dc1576

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line 
config ARM

	bool

	default y

	select ARCH_CLOCKSOURCE_DATA

	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

	select ARCH_HAS_DEVMEM_IS_ALLOWED

	select ARCH_HAS_ELF_RANDOMIZE

arch/arm/include/asm/clocksource.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
#ifndef _ASM_CLOCKSOURCE_H

#define _ASM_CLOCKSOURCE_H



struct arch_clocksource_data {

	bool vdso_direct;	/* Usable for direct VDSO access? */

};



#endif

arch/arm/kernel/vdso.c

+1 −1
Original line number Diff line number Diff line
@@ -270,7 +270,7 @@ static bool tk_is_cntvct(const struct timekeeper *tk) 
	if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER))

		return false;



	if (strcmp(tk->tkr_mono.clock->name, "arch_sys_counter") != 0)

	if (!tk->tkr_mono.clock->archdata.vdso_direct)

		return false;



	return true;

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ config ARM64 
	select ACPI_GENERIC_GSI if ACPI

	select ACPI_REDUCED_HARDWARE_ONLY if ACPI

	select ACPI_MCFG if ACPI

	select ARCH_CLOCKSOURCE_DATA

	select ARCH_HAS_DEVMEM_IS_ALLOWED

	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI

	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

arch/arm64/include/asm/clocksource.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
#ifndef _ASM_CLOCKSOURCE_H

#define _ASM_CLOCKSOURCE_H



struct arch_clocksource_data {

	bool vdso_direct;	/* Usable for direct VDSO access? */

};



#endif

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