Messages in this thread Patch in this message | | | From | "Suzuki K. Poulose" <> | Subject | [PATCH 3/5] arm64: debug: Treat the BRPs/WRPs as unsigned | Date | Wed, 18 Nov 2015 17:08:58 +0000 |
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IDAA64DFR0_EL1: BRPs and WRPs are unsigned values. Use the appropriate helpers to extract those fields.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reported-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> --- arch/arm64/include/asm/hw_breakpoint.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/hw_breakpoint.h b/arch/arm64/include/asm/hw_breakpoint.h index e54415e..9732908 100644 --- a/arch/arm64/include/asm/hw_breakpoint.h +++ b/arch/arm64/include/asm/hw_breakpoint.h @@ -138,16 +138,18 @@ extern struct pmu perf_ops_bp; /* Determine number of BRP registers available. */ static inline int get_num_brps(void) { + u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1); return 1 + - cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1), + cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_BRPS_SHIFT); } /* Determine number of WRP registers available. */ static inline int get_num_wrps(void) { + u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1); return 1 + - cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1), + cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_WRPS_SHIFT); } -- 1.7.9.5
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