From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58]) by dpdk.org (Postfix) with ESMTP id 9125968C0 for ; Thu, 20 Mar 2014 17:54:35 +0100 (CET) Received: from hmsreliant.think-freely.org ([2001:470:8:a08:7aac:c0ff:fec2:933b] helo=localhost) by smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63) (envelope-from ) id 1WQgFu-0006mD-ED; Thu, 20 Mar 2014 12:56:04 -0400 Date: Thu, 20 Mar 2014 12:55:45 -0400 From: Neil Horman To: "H. Peter Anvin" Message-ID: <20140320165545.GD7721@hmsreliant.think-freely.org> References: <1395333868-2808-1-git-send-email-hpa@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1395333868-2808-1-git-send-email-hpa@linux.intel.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Score: -2.9 (--) X-Spam-Status: No Cc: dev@dpdk.org, "H. Peter Anvin" Subject: Re: [dpdk-dev] [RFC UNTESTED PATCH] eal_common_cpuflags: Fix %rbx corruption, and simplify the code X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Mar 2014 16:54:36 -0000 On Thu, Mar 20, 2014 at 09:44:28AM -0700, H. Peter Anvin wrote: > Neil Horman reported that on x86-64 the upper half of %rbx would get > clobbered when the code was compiled PIC or PIE, because the > i386-specific code to preserve %ebx was incorrectly compiled. > > However, the code is really way more complex than it needs to be. For > one thing, the CPUID instruction only needs %eax (leaf) and %ecx > (subleaf) as parameters, and since we are testing for bits, we might > as well list the bits explicitly. Furthermore, we can use an array > rather than doing a switch statement inside a structure. > > Reported-by: Neil Horman > Signed-off-by: H. Peter Anvin Acked-by: Neil Horman > --- > lib/librte_eal/common/eal_common_cpuflags.c | 272 +++++++++++++--------------- > 1 file changed, 121 insertions(+), 151 deletions(-) > > diff --git a/lib/librte_eal/common/eal_common_cpuflags.c b/lib/librte_eal/common/eal_common_cpuflags.c > index 1ebf78cc2a48..bf66ad9d94ec 100644 > --- a/lib/librte_eal/common/eal_common_cpuflags.c > +++ b/lib/librte_eal/common/eal_common_cpuflags.c > @@ -54,21 +54,12 @@ > */ > enum cpu_register_t { > REG_EAX = 0, > - REG_EBX, > REG_ECX, > REG_EDX, > + REG_EBX, > }; > > -/** > - * Parameters for CPUID instruction > - */ > -struct cpuid_parameters_t { > - uint32_t eax; > - uint32_t ebx; > - uint32_t ecx; > - uint32_t edx; > - enum cpu_register_t return_register; > -}; > +typedef uint32_t cpuid_registers_t[4]; > > #define CPU_FLAG_NAME_MAX_LEN 64 > > @@ -78,8 +69,10 @@ struct cpuid_parameters_t { > struct feature_entry { > enum rte_cpu_flag_t feature; /**< feature name */ > char name[CPU_FLAG_NAME_MAX_LEN]; /**< String for printing */ > - struct cpuid_parameters_t params; /**< cpuid parameters */ > - uint32_t feature_mask; /**< bitmask for feature */ > + uint32_t leaf; /**< cpuid leaf */ > + uint32_t subleaf; /**< cpuid subleaf */ > + uint32_t reg; /**< cpuid register */ > + uint32_t bit; /**< cpuid register bit */ > }; > > #define FEAT_DEF(f) RTE_CPUFLAG_##f, #f > @@ -88,97 +81,97 @@ struct feature_entry { > * An array that holds feature entries > */ > static const struct feature_entry cpu_feature_table[] = { > - {FEAT_DEF(SSE3), {0x1, 0, 0, 0, REG_ECX}, 0x00000001}, > - {FEAT_DEF(PCLMULQDQ), {0x1, 0, 0, 0, REG_ECX}, 0x00000002}, > - {FEAT_DEF(DTES64), {0x1, 0, 0, 0, REG_ECX}, 0x00000004}, > - {FEAT_DEF(MONITOR), {0x1, 0, 0, 0, REG_ECX}, 0x00000008}, > - {FEAT_DEF(DS_CPL), {0x1, 0, 0, 0, REG_ECX}, 0x00000010}, > - {FEAT_DEF(VMX), {0x1, 0, 0, 0, REG_ECX}, 0x00000020}, > - {FEAT_DEF(SMX), {0x1, 0, 0, 0, REG_ECX}, 0x00000040}, > - {FEAT_DEF(EIST), {0x1, 0, 0, 0, REG_ECX}, 0x00000080}, > - {FEAT_DEF(TM2), {0x1, 0, 0, 0, REG_ECX}, 0x00000100}, > - {FEAT_DEF(SSSE3), {0x1, 0, 0, 0, REG_ECX}, 0x00000200}, > - {FEAT_DEF(CNXT_ID), {0x1, 0, 0, 0, REG_ECX}, 0x00000400}, > - {FEAT_DEF(FMA), {0x1, 0, 0, 0, REG_ECX}, 0x00001000}, > - {FEAT_DEF(CMPXCHG16B), {0x1, 0, 0, 0, REG_ECX}, 0x00002000}, > - {FEAT_DEF(XTPR), {0x1, 0, 0, 0, REG_ECX}, 0x00004000}, > - {FEAT_DEF(PDCM), {0x1, 0, 0, 0, REG_ECX}, 0x00008000}, > - {FEAT_DEF(PCID), {0x1, 0, 0, 0, REG_ECX}, 0x00020000}, > - {FEAT_DEF(DCA), {0x1, 0, 0, 0, REG_ECX}, 0x00040000}, > - {FEAT_DEF(SSE4_1), {0x1, 0, 0, 0, REG_ECX}, 0x00080000}, > - {FEAT_DEF(SSE4_2), {0x1, 0, 0, 0, REG_ECX}, 0x00100000}, > - {FEAT_DEF(X2APIC), {0x1, 0, 0, 0, REG_ECX}, 0x00200000}, > - {FEAT_DEF(MOVBE), {0x1, 0, 0, 0, REG_ECX}, 0x00400000}, > - {FEAT_DEF(POPCNT), {0x1, 0, 0, 0, REG_ECX}, 0x00800000}, > - {FEAT_DEF(TSC_DEADLINE), {0x1, 0, 0, 0, REG_ECX}, 0x01000000}, > - {FEAT_DEF(AES), {0x1, 0, 0, 0, REG_ECX}, 0x02000000}, > - {FEAT_DEF(XSAVE), {0x1, 0, 0, 0, REG_ECX}, 0x04000000}, > - {FEAT_DEF(OSXSAVE), {0x1, 0, 0, 0, REG_ECX}, 0x08000000}, > - {FEAT_DEF(AVX), {0x1, 0, 0, 0, REG_ECX}, 0x10000000}, > - {FEAT_DEF(F16C), {0x1, 0, 0, 0, REG_ECX}, 0x20000000}, > - {FEAT_DEF(RDRAND), {0x1, 0, 0, 0, REG_ECX}, 0x40000000}, > - > - {FEAT_DEF(FPU), {0x1, 0, 0, 0, REG_EDX}, 0x00000001}, > - {FEAT_DEF(VME), {0x1, 0, 0, 0, REG_EDX}, 0x00000002}, > - {FEAT_DEF(DE), {0x1, 0, 0, 0, REG_EDX}, 0x00000004}, > - {FEAT_DEF(PSE), {0x1, 0, 0, 0, REG_EDX}, 0x00000008}, > - {FEAT_DEF(TSC), {0x1, 0, 0, 0, REG_EDX}, 0x00000010}, > - {FEAT_DEF(MSR), {0x1, 0, 0, 0, REG_EDX}, 0x00000020}, > - {FEAT_DEF(PAE), {0x1, 0, 0, 0, REG_EDX}, 0x00000040}, > - {FEAT_DEF(MCE), {0x1, 0, 0, 0, REG_EDX}, 0x00000080}, > - {FEAT_DEF(CX8), {0x1, 0, 0, 0, REG_EDX}, 0x00000100}, > - {FEAT_DEF(APIC), {0x1, 0, 0, 0, REG_EDX}, 0x00000200}, > - {FEAT_DEF(SEP), {0x1, 0, 0, 0, REG_EDX}, 0x00000800}, > - {FEAT_DEF(MTRR), {0x1, 0, 0, 0, REG_EDX}, 0x00001000}, > - {FEAT_DEF(PGE), {0x1, 0, 0, 0, REG_EDX}, 0x00002000}, > - {FEAT_DEF(MCA), {0x1, 0, 0, 0, REG_EDX}, 0x00004000}, > - {FEAT_DEF(CMOV), {0x1, 0, 0, 0, REG_EDX}, 0x00008000}, > - {FEAT_DEF(PAT), {0x1, 0, 0, 0, REG_EDX}, 0x00010000}, > - {FEAT_DEF(PSE36), {0x1, 0, 0, 0, REG_EDX}, 0x00020000}, > - {FEAT_DEF(PSN), {0x1, 0, 0, 0, REG_EDX}, 0x00040000}, > - {FEAT_DEF(CLFSH), {0x1, 0, 0, 0, REG_EDX}, 0x00080000}, > - {FEAT_DEF(DS), {0x1, 0, 0, 0, REG_EDX}, 0x00200000}, > - {FEAT_DEF(ACPI), {0x1, 0, 0, 0, REG_EDX}, 0x00400000}, > - {FEAT_DEF(MMX), {0x1, 0, 0, 0, REG_EDX}, 0x00800000}, > - {FEAT_DEF(FXSR), {0x1, 0, 0, 0, REG_EDX}, 0x01000000}, > - {FEAT_DEF(SSE), {0x1, 0, 0, 0, REG_EDX}, 0x02000000}, > - {FEAT_DEF(SSE2), {0x1, 0, 0, 0, REG_EDX}, 0x04000000}, > - {FEAT_DEF(SS), {0x1, 0, 0, 0, REG_EDX}, 0x08000000}, > - {FEAT_DEF(HTT), {0x1, 0, 0, 0, REG_EDX}, 0x10000000}, > - {FEAT_DEF(TM), {0x1, 0, 0, 0, REG_EDX}, 0x20000000}, > - {FEAT_DEF(PBE), {0x1, 0, 0, 0, REG_EDX}, 0x80000000}, > - > - {FEAT_DEF(DIGTEMP), {0x6, 0, 0, 0, REG_EAX}, 0x00000001}, > - {FEAT_DEF(TRBOBST), {0x6, 0, 0, 0, REG_EAX}, 0x00000002}, > - {FEAT_DEF(ARAT), {0x6, 0, 0, 0, REG_EAX}, 0x00000004}, > - {FEAT_DEF(PLN), {0x6, 0, 0, 0, REG_EAX}, 0x00000010}, > - {FEAT_DEF(ECMD), {0x6, 0, 0, 0, REG_EAX}, 0x00000020}, > - {FEAT_DEF(PTM), {0x6, 0, 0, 0, REG_EAX}, 0x00000040}, > - > - {FEAT_DEF(MPERF_APERF_MSR), {0x6, 0, 0, 0, REG_ECX}, 0x00000001}, > - {FEAT_DEF(ACNT2), {0x6, 0, 0, 0, REG_ECX}, 0x00000002}, > - {FEAT_DEF(ENERGY_EFF), {0x6, 0, 0, 0, REG_ECX}, 0x00000008}, > - > - {FEAT_DEF(FSGSBASE), {0x7, 0, 0, 0, REG_EBX}, 0x00000001}, > - {FEAT_DEF(BMI1), {0x7, 0, 0, 0, REG_EBX}, 0x00000004}, > - {FEAT_DEF(HLE), {0x7, 0, 0, 0, REG_EBX}, 0x00000010}, > - {FEAT_DEF(AVX2), {0x7, 0, 0, 0, REG_EBX}, 0x00000020}, > - {FEAT_DEF(SMEP), {0x7, 0, 0, 0, REG_EBX}, 0x00000040}, > - {FEAT_DEF(BMI2), {0x7, 0, 0, 0, REG_EBX}, 0x00000080}, > - {FEAT_DEF(ERMS), {0x7, 0, 0, 0, REG_EBX}, 0x00000100}, > - {FEAT_DEF(INVPCID), {0x7, 0, 0, 0, REG_EBX}, 0x00000400}, > - {FEAT_DEF(RTM), {0x7, 0, 0, 0, REG_EBX}, 0x00000800}, > - > - {FEAT_DEF(LAHF_SAHF), {0x80000001, 0, 0, 0, REG_ECX}, 0x00000001}, > - {FEAT_DEF(LZCNT), {0x80000001, 0, 0, 0, REG_ECX}, 0x00000010}, > - > - {FEAT_DEF(SYSCALL), {0x80000001, 0, 0, 0, REG_EDX}, 0x00000800}, > - {FEAT_DEF(XD), {0x80000001, 0, 0, 0, REG_EDX}, 0x00100000}, > - {FEAT_DEF(1GB_PG), {0x80000001, 0, 0, 0, REG_EDX}, 0x04000000}, > - {FEAT_DEF(RDTSCP), {0x80000001, 0, 0, 0, REG_EDX}, 0x08000000}, > - {FEAT_DEF(EM64T), {0x80000001, 0, 0, 0, REG_EDX}, 0x20000000}, > - > - {FEAT_DEF(INVTSC), {0x80000007, 0, 0, 0, REG_EDX}, 0x00000100}, > + {FEAT_DEF(SSE3), 0x00000001, 0, REG_ECX, 0}, > + {FEAT_DEF(PCLMULQDQ), 0x00000001, 0, REG_ECX, 1}, > + {FEAT_DEF(DTES64), 0x00000001, 0, REG_ECX, 2}, > + {FEAT_DEF(MONITOR), 0x00000001, 0, REG_ECX, 3}, > + {FEAT_DEF(DS_CPL), 0x00000001, 0, REG_ECX, 4}, > + {FEAT_DEF(VMX), 0x00000001, 0, REG_ECX, 5}, > + {FEAT_DEF(SMX), 0x00000001, 0, REG_ECX, 6}, > + {FEAT_DEF(EIST), 0x00000001, 0, REG_ECX, 7}, > + {FEAT_DEF(TM2), 0x00000001, 0, REG_ECX, 8}, > + {FEAT_DEF(SSSE3), 0x00000001, 0, REG_ECX, 9}, > + {FEAT_DEF(CNXT_ID), 0x00000001, 0, REG_ECX, 10}, > + {FEAT_DEF(FMA), 0x00000001, 0, REG_ECX, 12}, > + {FEAT_DEF(CMPXCHG16B), 0x00000001, 0, REG_ECX, 13}, > + {FEAT_DEF(XTPR), 0x00000001, 0, REG_ECX, 14}, > + {FEAT_DEF(PDCM), 0x00000001, 0, REG_ECX, 15}, > + {FEAT_DEF(PCID), 0x00000001, 0, REG_ECX, 17}, > + {FEAT_DEF(DCA), 0x00000001, 0, REG_ECX, 18}, > + {FEAT_DEF(SSE4_1), 0x00000001, 0, REG_ECX, 19}, > + {FEAT_DEF(SSE4_2), 0x00000001, 0, REG_ECX, 20}, > + {FEAT_DEF(X2APIC), 0x00000001, 0, REG_ECX, 21}, > + {FEAT_DEF(MOVBE), 0x00000001, 0, REG_ECX, 22}, > + {FEAT_DEF(POPCNT), 0x00000001, 0, REG_ECX, 23}, > + {FEAT_DEF(TSC_DEADLINE), 0x00000001, 0, REG_ECX, 24}, > + {FEAT_DEF(AES), 0x00000001, 0, REG_ECX, 25}, > + {FEAT_DEF(XSAVE), 0x00000001, 0, REG_ECX, 26}, > + {FEAT_DEF(OSXSAVE), 0x00000001, 0, REG_ECX, 27}, > + {FEAT_DEF(AVX), 0x00000001, 0, REG_ECX, 28}, > + {FEAT_DEF(F16C), 0x00000001, 0, REG_ECX, 29}, > + {FEAT_DEF(RDRAND), 0x00000001, 0, REG_ECX, 30}, > + > + {FEAT_DEF(FPU), 0x00000001, 0, REG_EDX, 0}, > + {FEAT_DEF(VME), 0x00000001, 0, REG_EDX, 1}, > + {FEAT_DEF(DE), 0x00000001, 0, REG_EDX, 2}, > + {FEAT_DEF(PSE), 0x00000001, 0, REG_EDX, 3}, > + {FEAT_DEF(TSC), 0x00000001, 0, REG_EDX, 4}, > + {FEAT_DEF(MSR), 0x00000001, 0, REG_EDX, 5}, > + {FEAT_DEF(PAE), 0x00000001, 0, REG_EDX, 6}, > + {FEAT_DEF(MCE), 0x00000001, 0, REG_EDX, 7}, > + {FEAT_DEF(CX8), 0x00000001, 0, REG_EDX, 8}, > + {FEAT_DEF(APIC), 0x00000001, 0, REG_EDX, 9}, > + {FEAT_DEF(SEP), 0x00000001, 0, REG_EDX, 11}, > + {FEAT_DEF(MTRR), 0x00000001, 0, REG_EDX, 12}, > + {FEAT_DEF(PGE), 0x00000001, 0, REG_EDX, 13}, > + {FEAT_DEF(MCA), 0x00000001, 0, REG_EDX, 14}, > + {FEAT_DEF(CMOV), 0x00000001, 0, REG_EDX, 15}, > + {FEAT_DEF(PAT), 0x00000001, 0, REG_EDX, 16}, > + {FEAT_DEF(PSE36), 0x00000001, 0, REG_EDX, 17}, > + {FEAT_DEF(PSN), 0x00000001, 0, REG_EDX, 18}, > + {FEAT_DEF(CLFSH), 0x00000001, 0, REG_EDX, 19}, > + {FEAT_DEF(DS), 0x00000001, 0, REG_EDX, 21}, > + {FEAT_DEF(ACPI), 0x00000001, 0, REG_EDX, 22}, > + {FEAT_DEF(MMX), 0x00000001, 0, REG_EDX, 23}, > + {FEAT_DEF(FXSR), 0x00000001, 0, REG_EDX, 24}, > + {FEAT_DEF(SSE), 0x00000001, 0, REG_EDX, 25}, > + {FEAT_DEF(SSE2), 0x00000001, 0, REG_EDX, 26}, > + {FEAT_DEF(SS), 0x00000001, 0, REG_EDX, 27}, > + {FEAT_DEF(HTT), 0x00000001, 0, REG_EDX, 28}, > + {FEAT_DEF(TM), 0x00000001, 0, REG_EDX, 29}, > + {FEAT_DEF(PBE), 0x00000001, 0, REG_EDX, 31}, > + > + {FEAT_DEF(DIGTEMP), 0x00000006, 0, REG_EAX, 0}, > + {FEAT_DEF(TRBOBST), 0x00000006, 0, REG_EAX, 1}, > + {FEAT_DEF(ARAT), 0x00000006, 0, REG_EAX, 2}, > + {FEAT_DEF(PLN), 0x00000006, 0, REG_EAX, 4}, > + {FEAT_DEF(ECMD), 0x00000006, 0, REG_EAX, 5}, > + {FEAT_DEF(PTM), 0x00000006, 0, REG_EAX, 6}, > + > + {FEAT_DEF(MPERF_APERF_MSR), 0x00000006, 0, REG_ECX, 0}, > + {FEAT_DEF(ACNT2), 0x00000006, 0, REG_ECX, 1}, > + {FEAT_DEF(ENERGY_EFF), 0x00000006, 0, REG_ECX, 3}, > + > + {FEAT_DEF(FSGSBASE), 0x00000007, 0, REG_EBX, 0}, > + {FEAT_DEF(BMI1), 0x00000007, 0, REG_EBX, 2}, > + {FEAT_DEF(HLE), 0x00000007, 0, REG_EBX, 4}, > + {FEAT_DEF(AVX2), 0x00000007, 0, REG_EBX, 5}, > + {FEAT_DEF(SMEP), 0x00000007, 0, REG_EBX, 6}, > + {FEAT_DEF(BMI2), 0x00000007, 0, REG_EBX, 7}, > + {FEAT_DEF(ERMS), 0x00000007, 0, REG_EBX, 8}, > + {FEAT_DEF(INVPCID), 0x00000007, 0, REG_EBX, 10}, > + {FEAT_DEF(RTM), 0x00000007, 0, REG_EBX, 11}, > + > + {FEAT_DEF(LAHF_SAHF), 0x80000001, 0, REG_ECX, 0}, > + {FEAT_DEF(LZCNT), 0x80000001, 0, REG_ECX, 4}, > + > + {FEAT_DEF(SYSCALL), 0x80000001, 0, REG_EDX, 11}, > + {FEAT_DEF(XD), 0x80000001, 0, REG_EDX, 20}, > + {FEAT_DEF(1GB_PG), 0x80000001, 0, REG_EDX, 26}, > + {FEAT_DEF(RDTSCP), 0x80000001, 0, REG_EDX, 27}, > + {FEAT_DEF(EM64T), 0x80000001, 0, REG_EDX, 29}, > + > + {FEAT_DEF(INVTSC), 0x80000007, 0, REG_EDX, 8}, > }; > > /* > @@ -187,51 +180,25 @@ static const struct feature_entry cpu_feature_table[] = { > * This function, when compiled with GCC, will generate architecture-neutral > * code, as per GCC manual. > */ > -static inline int > -rte_cpu_get_features(struct cpuid_parameters_t params) > +static inline void > +rte_cpu_get_features(uint32_t leaf, uint32_t subleaf, cpuid_registers_t *out) > { > - int eax, ebx, ecx, edx; /* registers */ > - > -#ifndef __PIC__ > - asm volatile ("cpuid" > - /* output */ > - : "=a" (eax), > - "=b" (ebx), > - "=c" (ecx), > - "=d" (edx) > - /* input */ > - : "a" (params.eax), > - "b" (params.ebx), > - "c" (params.ecx), > - "d" (params.edx)); > +#if defined(__i386__) && defined(__PIC__) > + /* %ebx is a forbidden register if we compile with -fPIC or -fPIE */ > + asm volatile("movl %%ebx,%0 ; cpuid ; xchgl %%ebx,%0" > + : "=r" (out[REG_EBX]), > + "=a" (out[REG_EAX]), > + "=c" (out[REG_ECX]), > + "=d" (out[REG_EDX]) > + : "a" (leaf), "c" (subleaf)); > #else > - asm volatile ( > - "mov %%ebx, %%edi\n" > - "cpuid\n" > - "xchgl %%ebx, %%edi;\n" > - : "=a" (eax), > - "=D" (ebx), > - "=c" (ecx), > - "=d" (edx) > - /* input */ > - : "a" (params.eax), > - "D" (params.ebx), > - "c" (params.ecx), > - "d" (params.edx)); > + asm volatile("cpuid" > + : "=b" (out[REG_EBX]), > + "=a" (out[REG_EAX]), > + "=c" (out[REG_ECX]), > + "=d" (out[REG_EDX]) > + : "a" (leaf), "c" (subleaf)); > #endif > - > - switch (params.return_register) { > - case REG_EAX: > - return eax; > - case REG_EBX: > - return ebx; > - case REG_ECX: > - return ecx; > - case REG_EDX: > - return edx; > - default: > - return 0; > - } > } > > /* > @@ -240,17 +207,20 @@ rte_cpu_get_features(struct cpuid_parameters_t params) > int > rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature) > { > - int value; > + const struct feature_entry *feat; > + cpu_registers_t regs; > > if (feature >= RTE_CPUFLAG_NUMFLAGS) > /* Flag does not match anything in the feature tables */ > return -ENOENT; > > - /* get value of the register containing the desired feature */ > - value = rte_cpu_get_features(cpu_feature_table[feature].params); > + feat = &cpu_feature_table[feature]; > + > + /* get the cpuid leaf containing the desired feature */ > + rte_cpu_get_features(feat->leaf, feat->subleaf, ®s); > > /* check if the feature is enabled */ > - return (cpu_feature_table[feature].feature_mask & value) > 0; > + return (regs[feat->reg] >> feat->bit) & 1; > } > > /** > @@ -273,7 +243,7 @@ rte_cpu_check_supported(void) > unsigned i; > > for (i = 0; i < sizeof(compile_time_flags)/sizeof(compile_time_flags[0]); i++) > - if (rte_cpu_get_flag_enabled(compile_time_flags[i]) < 1) { > + if (!rte_cpu_get_flag_enabled(compile_time_flags[i])) { > fprintf(stderr, > "ERROR: This system does not support \"%s\".\n" > "Please check that RTE_MACHINE is set correctly.\n", > -- > 1.8.5.3 > >