From 8fce34cd0a6a55c965c222ab4de37615dea63621 Mon Sep 17 00:00:00 2001 From: Ruifeng Wang Date: Thu, 12 Nov 2020 18:31:57 +0800 Subject: [PATCH] eal/arm: fix clang build of native target When doing Clang build with '-mcpu=native' on N1 platform, build failed with: ../lib/librte_eal/arm/include/rte_atomic_64.h:76:39: error: instruction requires: lse __ATOMIC128_CAS_OP(__cas_128_release, "caspl") This is because native detection for Neoverse N1 was added in Clang-11. Prior version of Clang's assembler doesn't know LSE support on hardware. Fixed this for Clang earlier than version 11 by specifying architecture for assembler. Referred to [1] for this fix. Fixes: 7e2c3e17fe2c ("eal/arm64: add 128-bit atomic compare exchange") Cc: stable@dpdk.org [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e0d5896bd356cd577f9710a02d7a474cdf58426b Signed-off-by: Ruifeng Wang Reviewed-by: Jerin Jacob Reviewed-by: Honnappa Nagarahalli --- lib/librte_eal/arm/include/rte_atomic_64.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/librte_eal/arm/include/rte_atomic_64.h b/lib/librte_eal/arm/include/rte_atomic_64.h index 2cef88629c..7fcd174661 100644 --- a/lib/librte_eal/arm/include/rte_atomic_64.h +++ b/lib/librte_eal/arm/include/rte_atomic_64.h @@ -46,6 +46,8 @@ rte_atomic_thread_fence(int memorder) /*------------------------ 128 bit atomic operations -------------------------*/ #if defined(__ARM_FEATURE_ATOMICS) || defined(RTE_ARM_FEATURE_ATOMICS) +#define __LSE_PREAMBLE ".arch armv8-a+lse\n" + #define __ATOMIC128_CAS_OP(cas_op_name, op_string) \ static __rte_noinline rte_int128_t \ cas_op_name(rte_int128_t *dst, rte_int128_t old, rte_int128_t updated) \ @@ -59,6 +61,7 @@ cas_op_name(rte_int128_t *dst, rte_int128_t old, rte_int128_t updated) \ register uint64_t x2 __asm("x2") = (uint64_t)updated.val[0]; \ register uint64_t x3 __asm("x3") = (uint64_t)updated.val[1]; \ asm volatile( \ + __LSE_PREAMBLE \ op_string " %[old0], %[old1], %[upd0], %[upd1], [%[dst]]" \ : [old0] "+r" (x0), \ [old1] "+r" (x1) \ @@ -76,6 +79,7 @@ __ATOMIC128_CAS_OP(__cas_128_acquire, "caspa") __ATOMIC128_CAS_OP(__cas_128_release, "caspl") __ATOMIC128_CAS_OP(__cas_128_acq_rel, "caspal") +#undef __LSE_PREAMBLE #undef __ATOMIC128_CAS_OP #endif -- 2.20.1