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From: Andrew Murray <andrew.murray@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ard.Biesheuvel@arm.com
Cc: Mark Rutland <mark.rutland@arm.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 5/5] arm64: atomics: remove atomic_ll_sc compilation unit
Date: Wed, 31 Jul 2019 17:12:56 +0100	[thread overview]
Message-ID: <20190731161256.22210-6-andrew.murray@arm.com> (raw)
In-Reply-To: <20190731161256.22210-1-andrew.murray@arm.com>

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. Let's
remove the now unused compilation unit which provided these symbols.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
---
 arch/arm64/lib/Makefile       | 19 -------------------
 arch/arm64/lib/atomic_ll_sc.c |  3 ---
 2 files changed, 22 deletions(-)
 delete mode 100644 arch/arm64/lib/atomic_ll_sc.c

diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
index 33c2a4abda04..f10809ef1690 100644
--- 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
index b0c538b0da28..000000000000
--- 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>
-- 
2.21.0


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      parent reply	other threads:[~2019-07-31 16:14 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-31 16:12 [PATCH v2 0/5] arm64: avoid out-of-line ll/sc atomics Andrew Murray
2019-07-31 16:12 ` [PATCH v2 1/5] jump_label: Don't warn on __exit jump entries Andrew Murray
2019-07-31 16:41   ` Peter Zijlstra
2019-08-02  8:22     ` Andrew Murray
2019-07-31 16:12 ` [PATCH v2 2/5] arm64: Use correct ll/sc atomic constraints Andrew Murray
2019-07-31 16:12 ` [PATCH v2 3/5] arm64: atomics: avoid out-of-line ll/sc atomics Andrew Murray
2019-08-01  3:10   ` Boqun Feng
2019-08-01  8:12     ` Andrew Murray
2019-07-31 16:12 ` [PATCH v2 4/5] arm64: avoid using hard-coded registers for LSE atomics Andrew Murray
2019-07-31 16:12 ` Andrew Murray [this message]

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