From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH] arm64: scs: Drop unused 'tmp' argument to scs_{load, save} asm macros
Date: Thu, 27 May 2021 11:55:29 +0100 [thread overview]
Message-ID: <20210527105529.21967-1-will@kernel.org> (raw)
The scs_load and scs_save asm macros don't make use of the mandatory
'tmp' register argument, so drop it and fix up the callers.
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
Applies against for-next/boot
arch/arm64/include/asm/scs.h | 8 ++++----
arch/arm64/kernel/entry.S | 8 ++++----
arch/arm64/kernel/head.S | 2 +-
3 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/include/asm/scs.h b/arch/arm64/include/asm/scs.h
index eaa2cd92e4c1..8297bccf0784 100644
--- a/arch/arm64/include/asm/scs.h
+++ b/arch/arm64/include/asm/scs.h
@@ -9,18 +9,18 @@
#ifdef CONFIG_SHADOW_CALL_STACK
scs_sp .req x18
- .macro scs_load tsk, tmp
+ .macro scs_load tsk
ldr scs_sp, [\tsk, #TSK_TI_SCS_SP]
.endm
- .macro scs_save tsk, tmp
+ .macro scs_save tsk
str scs_sp, [\tsk, #TSK_TI_SCS_SP]
.endm
#else
- .macro scs_load tsk, tmp
+ .macro scs_load tsk
.endm
- .macro scs_save tsk, tmp
+ .macro scs_save tsk
.endm
#endif /* CONFIG_SHADOW_CALL_STACK */
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 294f24e16fee..3153f1448cdb 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -275,7 +275,7 @@ alternative_else_nop_endif
mte_set_kernel_gcr x22, x23
- scs_load tsk, x20
+ scs_load tsk
.else
add x21, sp, #PT_REGS_SIZE
get_current_task tsk
@@ -375,7 +375,7 @@ alternative_if ARM64_WORKAROUND_845719
alternative_else_nop_endif
#endif
3:
- scs_save tsk, x0
+ scs_save tsk
#ifdef CONFIG_ARM64_PTR_AUTH
alternative_if ARM64_HAS_ADDRESS_AUTH
@@ -979,8 +979,8 @@ SYM_FUNC_START(cpu_switch_to)
mov sp, x9
msr sp_el0, x1
ptrauth_keys_install_kernel x1, x8, x9, x10
- scs_save x0, x8
- scs_load x1, x8
+ scs_save x0
+ scs_load x1
ret
SYM_FUNC_END(cpu_switch_to)
NOKPROBE(cpu_switch_to)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 070ed53c049d..6a700526b117 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -412,7 +412,7 @@ SYM_FUNC_END(__create_page_tables)
stp xzr, xzr, [sp, #S_STACKFRAME]
add x29, sp, #S_STACKFRAME
- scs_load \tsk, \tmp1
+ scs_load \tsk
adr_l \tmp1, __per_cpu_offset
ldr w\tmp2, [\tsk, #TSK_CPU]
--
2.31.1.818.g46aad6cb9e-goog
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next reply other threads:[~2021-05-27 10:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 10:55 Will Deacon [this message]
2021-05-27 11:03 ` [PATCH] arm64: scs: Drop unused 'tmp' argument to scs_{load,save} asm macros Mark Rutland
2021-05-27 15:08 ` [PATCH] arm64: scs: Drop unused 'tmp' argument to scs_{load, save} " Sami Tolvanen
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