IDAA64DFR0_EL1: BRPs and WRPs are unsigned values. Use the appropriate helpers to extract those fields.
Cc: Ard Biesheuvel <[email protected]> Reported-by: AKASHI Takahiro <[email protected]> Signed-off-by: Suzuki K. Poulose <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
