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Message-ID: <20240318071429.910454-1-xin@zytor.com>
Date: Mon, 18 Mar 2024 00:14:29 -0700
From: "Xin Li (Intel)" <xin@...or.com>
To: linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
linux-arch@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
jgross@...e.com, boris.ostrovsky@...cle.com, arnd@...db.de
Subject: [PATCH v2 1/1] x86: Rename __{start,end}_init_task to __{start,end}_init_stack
The stack of a task has been separated from the memory of a task_struct
struture for a long time on x86, as a result __{start,end}_init_task no
longer mark the start and end of the init_task structure, but its stack
only.
Rename __{start,end}_init_task to __{start,end}_init_stack.
Note other architectures are not affected because __{start,end}_init_task
are used on x86 only.
Signed-off-by: Xin Li (Intel) <xin@...or.com>
---
Change since v1:
* Revert an accident insane change, init_task to init_stack (Jürgen Groß).
---
arch/x86/include/asm/processor.h | 4 ++--
arch/x86/kernel/head_64.S | 2 +-
arch/x86/xen/xen-head.S | 2 +-
include/asm-generic/vmlinux.lds.h | 6 +++---
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 811548f131f4..8b3a3f3bb859 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -636,10 +636,10 @@ static __always_inline void prefetchw(const void *x)
#define KSTK_ESP(task) (task_pt_regs(task)->sp)
#else
-extern unsigned long __end_init_task[];
+extern unsigned long __end_init_stack[];
#define INIT_THREAD { \
- .sp = (unsigned long)&__end_init_task - \
+ .sp = (unsigned long)&__end_init_stack - \
TOP_OF_KERNEL_STACK_PADDING - \
sizeof(struct pt_regs), \
}
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index d8198fbd70e5..c7babd7ebb0f 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -66,7 +66,7 @@ SYM_CODE_START_NOALIGN(startup_64)
mov %rsi, %r15
/* Set up the stack for verify_cpu() */
- leaq (__end_init_task - TOP_OF_KERNEL_STACK_PADDING - PTREGS_SIZE)(%rip), %rsp
+ leaq (__end_init_stack - TOP_OF_KERNEL_STACK_PADDING - PTREGS_SIZE)(%rip), %rsp
/* Setup GSBASE to allow stack canary access for C code */
movl $MSR_GS_BASE, %ecx
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 04101b984f24..43eadf03f46d 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -49,7 +49,7 @@ SYM_CODE_START(startup_xen)
ANNOTATE_NOENDBR
cld
- leaq (__end_init_task - TOP_OF_KERNEL_STACK_PADDING - PTREGS_SIZE)(%rip), %rsp
+ leaq (__end_init_stack - TOP_OF_KERNEL_STACK_PADDING - PTREGS_SIZE)(%rip), %rsp
/* Set up %gs.
*
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 514d3002ad8a..cdfdcca23045 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -399,13 +399,13 @@
#define INIT_TASK_DATA(align) \
. = ALIGN(align); \
- __start_init_task = .; \
+ __start_init_stack = .; \
init_thread_union = .; \
init_stack = .; \
KEEP(*(.data..init_task)) \
KEEP(*(.data..init_thread_info)) \
- . = __start_init_task + THREAD_SIZE; \
- __end_init_task = .;
+ . = __start_init_stack + THREAD_SIZE; \
+ __end_init_stack = .;
#define JUMP_TABLE_DATA \
. = ALIGN(8); \
base-commit: 7e19a79344df2ed5e106091c29338962261b0290
--
2.44.0
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