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| author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-10-19 14:24:54 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-21 15:35:59 +0100 |
| commit | 3085bb01b40676d946a13064483ab2819ae3b010 (patch) | |
| tree | 89c04738eea71181db2fd293e6fd1afb5582eeba /arch/arm64/kernel | |
| parent | fe80f9f2da1006a4308c2bc018ee1d67f10dd8d0 (diff) | |
| download | lwn-3085bb01b40676d946a13064483ab2819ae3b010.tar.gz lwn-3085bb01b40676d946a13064483ab2819ae3b010.zip | |
arm64/debug: Make use of the system wide safe value
Use the system wide value of ID_AA64DFR0 to make safer decisions
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/debug-monitors.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index 8eef30f92651..1429044b143c 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -26,14 +26,16 @@ #include <linux/stat.h> #include <linux/uaccess.h> -#include <asm/debug-monitors.h> +#include <asm/cpufeature.h> #include <asm/cputype.h> +#include <asm/debug-monitors.h> #include <asm/system_misc.h> /* Determine debug architecture. */ u8 debug_monitors_arch(void) { - return read_cpuid(ID_AA64DFR0_EL1) & 0xf; + return cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1), + ID_AA64DFR0_DEBUGVER_SHIFT); } /* |