Meelis Roos <mr...@linux.ee> writes: > Got this on my PowerPC G4 (533 MHz, PowerPC 7410, PowerMac3,4 platform), > with gcc version 5.3.1 20160509 (Debian 5.3.1-19): > > [ 0.000000] > ================================================================================ > [ 0.000000] UBSAN: Undefined behaviour in > arch/powerpc/kernel/cputable.c:2240:25 > [ 0.000000] shift exponent 32 is too large for 32-bit type 'long unsigned > int' > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted > 4.8.0-rc5-00075-gd71f058 #106 > [ 0.000000] Call Trace: > [ 0.000000] [c0a5ff10] [c03aa588] ubsan_epilogue+0x18/0x4c (unreliable) > [ 0.000000] [c0a5ff20] [c03aab38] > __ubsan_handle_shift_out_of_bounds+0xe8/0x13c > [ 0.000000] [c0a5ffa0] [c07c42d0] cpu_feature_keys_init+0xa0/0xb8 > [ 0.000000] [c0a5ffd0] [c07ca1fc] setup_feature_keys+0x14/0x24 > [ 0.000000] [c0a5ffe0] [c07c6c74] machine_init+0x18/0x58 > [ 0.000000] [c0a5fff0] [c000341c] start_here+0x38/0x78 > [ 0.000000] > ================================================================================ > >
Can you try diff --git a/arch/powerpc/include/asm/cpu_has_feature.h b/arch/powerpc/include/asm/cpu_has_feature.h index 2ef55f8968a2..b312b152461b 100644 --- a/arch/powerpc/include/asm/cpu_has_feature.h +++ b/arch/powerpc/include/asm/cpu_has_feature.h @@ -15,7 +15,7 @@ static inline bool early_cpu_has_feature(unsigned long feature) #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS #include <linux/jump_label.h> -#define NUM_CPU_FTR_KEYS 64 +#define NUM_CPU_FTR_KEYS BITS_PER_LONG extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];