@@ -1072,6 +1072,7 @@ config ARM64_PAN
config ARM64_LSE_ATOMICS
bool "Atomic instructions"
default y
+ depends on $(as-instr,.arch_extension lse)
help
As part of the Large System Extensions, ARMv8.1 introduces new
atomic instructions that are designed specifically to scale in
@@ -32,15 +32,6 @@ endif
KBUILD_DEFCONFIG := defconfig
-# Check for binutils support for specific extensions
-lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
-
-ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
- ifeq ($(lseinstr),)
-$(warning LSE atomics not supported by binutils)
- endif
-endif
-
ifeq ($(CONFIG_ARM64), y)
brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
@@ -49,9 +40,9 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable)
endif
endif
-KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst)
+KBUILD_CFLAGS += -mgeneral-regs-only $(brokengasinst)
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
-KBUILD_AFLAGS += $(lseinstr) $(brokengasinst)
+KBUILD_AFLAGS += $(brokengasinst)
KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
@@ -30,7 +30,7 @@
#define __ARM64_IN_ATOMIC_IMPL
-#if defined(CONFIG_ARM64_LSE_ATOMICS) && defined(CONFIG_AS_LSE)
+#ifdef CONFIG_ARM64_LSE_ATOMICS
#include <asm/atomic_lse.h>
#else
#include <asm/atomic_ll_sc.h>
@@ -2,7 +2,7 @@
#ifndef __ASM_LSE_H
#define __ASM_LSE_H
-#if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
+#ifdef CONFIG_ARM64_LSE_ATOMICS
#include <linux/compiler_types.h>
#include <linux/export.h>
@@ -36,7 +36,7 @@
ALTERNATIVE(llsc, lse, ARM64_HAS_LSE_ATOMICS)
#endif /* __ASSEMBLER__ */
-#else /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
+#else /* CONFIG_ARM64_LSE_ATOMICS */
#ifdef __ASSEMBLER__
@@ -53,5 +53,5 @@
#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
#endif /* __ASSEMBLER__ */
-#endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
+#endif /* CONFIG_ARM64_LSE_ATOMICS */
#endif /* __ASM_LSE_H */
@@ -1170,7 +1170,7 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
.cpu_enable = cpu_enable_pan,
},
#endif /* CONFIG_ARM64_PAN */
-#if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
+#ifdef CONFIG_ARM64_LSE_ATOMICS
{
.desc = "LSE atomic instructions",
.capability = ARM64_HAS_LSE_ATOMICS,
@@ -1181,7 +1181,7 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
.sign = FTR_UNSIGNED,
.min_field_value = 2,
},
-#endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
+#endif /* CONFIG_ARM64_LSE_ATOMICS */
{
.desc = "Software prefetching using PRFM",
.capability = ARM64_HAS_NO_HW_PREFETCH,
So we can simply hide LSE support if dependency is not satisfied. Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> --- arch/arm64/Kconfig | 1 + arch/arm64/Makefile | 13 ++----------- arch/arm64/include/asm/atomic.h | 2 +- arch/arm64/include/asm/lse.h | 6 +++--- arch/arm64/kernel/cpufeature.c | 4 ++-- 5 files changed, 9 insertions(+), 17 deletions(-)