arm64: atomics: Remove atomic_ll_sc compilation unit

We no longer fall back to out-of-line atomics on systems with
CONFIG_ARM64_LSE_ATOMICS where ARM64_HAS_LSE_ATOMICS is not set.

Remove the unused compilation unit which provided these symbols.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
index 33c2a4abda046532c733b1fcc55f90ff8fa68d7c..f10809ef1690a00f3f8b1499254f2fdb605f16e0 100644 (file)
--- a/arch/arm64/lib/Makefile
+++ b/arch/arm64/lib/Makefile
@@ -11,25 +11,6 @@ CFLAGS_REMOVE_xor-neon.o     += -mgeneral-regs-only
 CFLAGS_xor-neon.o              += -ffreestanding
 endif
 
-# Tell the compiler to treat all general purpose registers (with the
-# exception of the IP registers, which are already handled by the caller
-# in case of a PLT) as callee-saved, which allows for efficient runtime
-# patching of the bl instruction in the caller with an atomic instruction
-# when supported by the CPU. Result and argument registers are handled
-# correctly, based on the function prototype.
-lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o
-CFLAGS_atomic_ll_sc.o  := -ffixed-x1 -ffixed-x2                        \
-                  -ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6          \
-                  -ffixed-x7 -fcall-saved-x8 -fcall-saved-x9           \
-                  -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12   \
-                  -fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15   \
-                  -fcall-saved-x18 -fomit-frame-pointer
-CFLAGS_REMOVE_atomic_ll_sc.o := $(CC_FLAGS_FTRACE)
-GCOV_PROFILE_atomic_ll_sc.o    := n
-KASAN_SANITIZE_atomic_ll_sc.o  := n
-KCOV_INSTRUMENT_atomic_ll_sc.o := n
-UBSAN_SANITIZE_atomic_ll_sc.o  := n
-
 lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o
 
 obj-$(CONFIG_CRC32) += crc32.o

diff --git a/arch/arm64/lib/atomic_ll_sc.c b/arch/arm64/lib/atomic_ll_sc.c
deleted file mode 100644 (file)
index b0c538b..0000000
--- a/arch/arm64/lib/atomic_ll_sc.c
+++ /dev/null
@@ -1,3 +0,0 @@
-#include <asm/atomic.h>
-#define __ARM64_IN_ATOMIC_IMPL
-#include <asm/atomic_ll_sc.h>