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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: mark.rutland@arm.com, peterz@infradead.org,
	catalin.marinas@arm.com, ndesaulniers@google.com,
	robin.murphy@arm.com, Ard.Biesheuvel@arm.com,
	andrew.murray@arm.com, natechancellor@gmail.com,
	Will Deacon <will@kernel.org>
Subject: [PATCH v5 05/10] arm64: atomics: Remove atomic_ll_sc compilation unit
Date: Thu, 29 Aug 2019 16:48:29 +0100	[thread overview]
Message-ID: <20190829154834.26547-6-will@kernel.org> (raw)
In-Reply-To: <20190829154834.26547-1-will@kernel.org>

From: Andrew Murray <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.

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>
---
 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>
-- 
2.11.0


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  parent reply	other threads:[~2019-08-29 15:51 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-29 15:48 [PATCH v5 00/10] arm64: avoid out-of-line ll/sc atomics Will Deacon
2019-08-29 15:48 ` [PATCH v5 01/10] jump_label: Don't warn on __exit jump entries Will Deacon
2019-08-29 15:48 ` [PATCH v5 02/10] arm64: Use correct ll/sc atomic constraints Will Deacon
2019-08-29 15:48 ` [PATCH v5 03/10] arm64: atomics: avoid out-of-line ll/sc atomics Will Deacon
2019-09-03  6:00   ` Nathan Chancellor
2019-09-03  6:39     ` Will Deacon
2019-09-03 14:31     ` Andrew Murray
2019-09-03 14:45       ` Will Deacon
2019-09-03 15:15         ` Andrew Murray
2019-09-03 15:31           ` Andrew Murray
2019-09-03 16:37             ` Will Deacon
2019-09-03 22:04               ` Andrew Murray
2019-09-03 22:35                 ` Nick Desaulniers
     [not found]                   ` <CANW9uyuRFtNKMnSwmHWt_RebJA1ADXdZfeDHc6=yaaFH2NsyWg@mail.gmail.com>
2019-09-03 22:53                     ` Nick Desaulniers
2019-09-04 10:20                       ` Will Deacon
2019-09-04 17:28                 ` Nick Desaulniers
2019-09-05 11:25                   ` Andrew Murray
2019-09-06 19:44                     ` Nick Desaulniers
2019-08-29 15:48 ` [PATCH v5 04/10] arm64: avoid using hard-coded registers for LSE atomics Will Deacon
2019-08-29 15:48 ` Will Deacon [this message]
2019-08-29 17:47   ` [PATCH v5 05/10] arm64: atomics: Remove atomic_ll_sc compilation unit Nick Desaulniers
2019-08-29 20:07     ` Tri Vo
2019-08-29 21:54       ` Will Deacon
2019-08-29 15:48 ` [PATCH v5 06/10] arm64: lse: Remove unused 'alt_lse' assembly macro Will Deacon
2019-08-29 23:39   ` Andrew Murray
2019-08-29 15:48 ` [PATCH v5 07/10] arm64: asm: Kill 'asm/atomic_arch.h' Will Deacon
2019-08-29 23:43   ` Andrew Murray
2019-08-29 15:48 ` [PATCH v5 08/10] arm64: lse: Make ARM64_LSE_ATOMICS depend on JUMP_LABEL Will Deacon
2019-08-29 23:44   ` Andrew Murray
2019-08-29 15:48 ` [PATCH v5 09/10] arm64: atomics: Undefine internal macros after use Will Deacon
2019-08-29 23:44   ` Andrew Murray
2019-08-29 15:48 ` [PATCH v5 10/10] arm64: atomics: Use K constraint when toolchain appears to support it Will Deacon
2019-08-29 16:54   ` Will Deacon
2019-08-29 17:45     ` Nick Desaulniers
2019-08-29 21:53       ` Will Deacon
2019-08-30 20:57         ` Nick Desaulniers
2019-08-30  0:08     ` Andrew Murray
2019-08-30  7:52       ` Will Deacon
2019-08-30  9:11         ` Andrew Murray
2019-08-30 10:17           ` Will Deacon
2019-08-30 11:57             ` Andrew Murray
2019-08-30 10:40           ` Mark Rutland
2019-08-30 11:53             ` Andrew Murray
2019-08-29 23:49   ` Andrew Murray

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