The following commit has been merged into the x86/asm branch of tip:
Commit-ID: 38a4968b3190f873a8a60e953287278eddf037f1
Gitweb: https://git.kernel.org/tip/38a4968b3190f873a8a60e953287278eddf037f1
Author: Brian Gerst <brgerst@xxxxxxxxx>
AuthorDate: Thu, 23 Jan 2025 14:07:43 -05:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 18 Feb 2025 10:15:50 +01:00
x86/percpu/64: Remove INIT_PER_CPU macros
Now that the load and link addresses of percpu variables are the same,
these macros are no longer necessary.
Signed-off-by: Brian Gerst <brgerst@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Reviewed-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20250123190747.745588-12-brgerst@xxxxxxxxx
---
arch/x86/include/asm/desc.h | 1 -
arch/x86/include/asm/percpu.h | 22 ----------------------
arch/x86/kernel/head64.c | 2 +-
arch/x86/kernel/irq_64.c | 1 -
arch/x86/kernel/vmlinux.lds.S | 7 -------
arch/x86/tools/relocs.c | 1 -
6 files changed, 1 insertion(+), 33 deletions(-)
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 62dc9f5..ec95fe4 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -46,7 +46,6 @@ struct gdt_page {
} __attribute__((aligned(PAGE_SIZE)));
DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page);
-DECLARE_INIT_PER_CPU(gdt_page);
/* Provide the original GDT */
static inline struct desc_struct *get_cpu_gdt_rw(unsigned int cpu)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index e525cd8..1a76eb8 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -20,12 +20,6 @@
#define PER_CPU_VAR(var) __percpu(var)__percpu_rel
-#ifdef CONFIG_X86_64_SMP
-# define INIT_PER_CPU_VAR(var) init_per_cpu__##var
-#else
-# define INIT_PER_CPU_VAR(var) var
-#endif
-
#else /* !__ASSEMBLY__: */
#include <linux/build_bug.h>
@@ -98,22 +92,6 @@
#define __force_percpu_arg(x) __force_percpu_prefix "%" #x
/*
- * Initialized pointers to per-CPU variables needed for the boot
- * processor need to use these macros to get the proper address
- * offset from __per_cpu_load on SMP.
- *
- * There also must be an entry in vmlinux_64.lds.S
- */
-#define DECLARE_INIT_PER_CPU(var) \
- extern typeof(var) init_per_cpu_var(var)
-
-#ifdef CONFIG_X86_64_SMP
-# define init_per_cpu_var(var) init_per_cpu__##var
-#else
-# define init_per_cpu_var(var) var
-#endif
-
-/*
* For arch-specific code, we can use direct single-insn ops (they
* don't give an lvalue though).
*/
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 22c9ba3..05f8b8a 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -567,7 +567,7 @@ void early_setup_idt(void)
*/
void __head startup_64_setup_gdt_idt(void)
{
- struct desc_struct *gdt = (void *)(__force unsigned long)init_per_cpu_var(gdt_page.gdt);
+ struct desc_struct *gdt = (void *)(__force unsigned long)gdt_page.gdt;
void *handler = NULL;
struct desc_ptr startup_gdt_descr = {
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index ade0043..56bdeec 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -27,7 +27,6 @@
#include <asm/apic.h>
DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible;
-DECLARE_INIT_PER_CPU(irq_stack_backing_store);
#ifdef CONFIG_VMAP_STACK
/*
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 93c2fa8..1769a71 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -471,13 +471,6 @@ SECTIONS
PROVIDE(__ref_stack_chk_guard = __stack_chk_guard);
#ifdef CONFIG_X86_64
-/*
- * Per-cpu symbols which need to be offset from __per_cpu_load
- * for the boot processor.
- */
-#define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x)
-INIT_PER_CPU(gdt_page);
-INIT_PER_CPU(irq_stack_backing_store);
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
. = ASSERT((retbleed_return_thunk & 0x3f) == 0, "retbleed_return_thunk not cacheline-aligned");
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index ae69626..5778bc4 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -90,7 +90,6 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = {
"__initramfs_start|"
"(jiffies|jiffies_64)|"
#if ELF_BITS == 64
- "init_per_cpu__.*|"
"__end_rodata_hpage_align|"
#endif
"_end)$"
|