diff options
| author | Scott Wood <oss@buserror.net> | 2016-09-22 08:35:18 (GMT) |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-09-23 16:19:25 (GMT) |
| commit | 1d8f51d41fc7116f3753fe9f9a5dd93e0b550a2c (patch) | |
| tree | abbb60533f4f4de2f8b543241a8c7bb1913a2dab /arch/arm | |
| parent | f6dc1576cd517440313c9551b6ffa3d7e389c7c7 (diff) | |
| download | linux-1d8f51d41fc7116f3753fe9f9a5dd93e0b550a2c.tar.xz | |
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: Will Deacon <will.deacon@arm.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Scott Wood <oss@buserror.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/clocksource.h | 8 | ||||
| -rw-r--r-- | arch/arm/kernel/vdso.c | 2 |
3 files changed, 10 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a9c4e48..b2113c2 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1,6 +1,7 @@ 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 diff --git a/arch/arm/include/asm/clocksource.h b/arch/arm/include/asm/clocksource.h new file mode 100644 index 0000000..0b350a7 --- /dev/null +++ b/arch/arm/include/asm/clocksource.h @@ -0,0 +1,8 @@ +#ifndef _ASM_CLOCKSOURCE_H +#define _ASM_CLOCKSOURCE_H + +struct arch_clocksource_data { + bool vdso_direct; /* Usable for direct VDSO access? */ +}; + +#endif diff --git a/arch/arm/kernel/vdso.c b/arch/arm/kernel/vdso.c index 994e971..a0affd1 100644 --- a/arch/arm/kernel/vdso.c +++ b/arch/arm/kernel/vdso.c @@ -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; |