linux-kernel - [tip: x86/asm] x86/percpu/64: Remove fixed_percpu

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Message-ID: <173988070520.10177.816809442742762032.tip-bot2@tip-bot2>
Date: Tue, 18 Feb 2025 12:11:45 -0000
From: "tip-bot2 for Brian Gerst" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Brian Gerst <brgerst@...il.com>, Ingo Molnar <mingo@...nel.org>,
 Ard Biesheuvel <ardb@...nel.org>, Uros Bizjak <ubizjak@...il.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/asm] x86/percpu/64: Remove fixed_percpu_data

The following commit has been merged into the x86/asm branch of tip:

Commit-ID:     b5c4f95351a097a635c1a7fc8d9efa18308491b5
Gitweb:        https://git.kernel.org/tip/b5c4f95351a097a635c1a7fc8d9efa18308491b5
Author:        Brian Gerst <brgerst@...il.com>
AuthorDate:    Thu, 23 Jan 2025 14:07:41 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 18 Feb 2025 10:15:43 +01:00

x86/percpu/64: Remove fixed_percpu_data

Now that the stack protector canary value is a normal percpu variable,
fixed_percpu_data is unused and can be removed.

Signed-off-by: Brian Gerst <brgerst@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Ard Biesheuvel <ardb@...nel.org>
Reviewed-by: Uros Bizjak <ubizjak@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/r/20250123190747.745588-10-brgerst@gmail.com
---
 arch/x86/include/asm/processor.h | 8 --------
 arch/x86/kernel/cpu/common.c     | 4 ----
 arch/x86/kernel/vmlinux.lds.S    | 1 -
 arch/x86/tools/relocs.c          | 1 -
 4 files changed, 14 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index b8fee88..b3d1537 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -421,14 +421,6 @@ struct irq_stack {
 } __aligned(IRQ_STACK_SIZE);
 
 #ifdef CONFIG_X86_64
-struct fixed_percpu_data {
-	char		gs_base[40];
-	unsigned long	reserved;
-};
-
-DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible;
-DECLARE_INIT_PER_CPU(fixed_percpu_data);
-
 static inline unsigned long cpu_kernelmode_gs_base(int cpu)
 {
 #ifdef CONFIG_SMP
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index b71178f..8b49b13 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2023,10 +2023,6 @@ EXPORT_PER_CPU_SYMBOL(pcpu_hot);
 EXPORT_PER_CPU_SYMBOL(const_pcpu_hot);
 
 #ifdef CONFIG_X86_64
-DEFINE_PER_CPU_FIRST(struct fixed_percpu_data,
-		     fixed_percpu_data) __aligned(PAGE_SIZE) __visible;
-EXPORT_PER_CPU_SYMBOL_GPL(fixed_percpu_data);
-
 static void wrmsrl_cstar(unsigned long val)
 {
 	/*
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 8a59851..93c2fa8 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -477,7 +477,6 @@ PROVIDE(__ref_stack_chk_guard = __stack_chk_guard);
  */
 #define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x)
 INIT_PER_CPU(gdt_page);
-INIT_PER_CPU(fixed_percpu_data);
 INIT_PER_CPU(irq_stack_backing_store);
 
 #ifdef CONFIG_MITIGATION_UNRET_ENTRY
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index 3cb3b30..b5e3695 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -830,7 +830,6 @@ static void percpu_init(void)
  *	__per_cpu_load
  *
  * The "gold" linker incorrectly associates:
- *	init_per_cpu__fixed_percpu_data
  *	init_per_cpu__gdt_page
  */
 static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)