[RFC PATCH 09/11] x86/percpu: Remove pcpu_hot
From: Brian Gerst
Date: Sat Feb 22 2025 - 14:08:34 EST
All fields have been moved to the percpu hot section.
Signed-off-by: Brian Gerst <brgerst@xxxxxxxxx>
---
arch/x86/include/asm/current.h | 11 -----------
arch/x86/kernel/cpu/common.c | 4 ----
arch/x86/kernel/vmlinux.lds.S | 1 -
3 files changed, 16 deletions(-)
diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index 043888c258bd..b6d1adb5538f 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -12,17 +12,6 @@
struct task_struct;
-struct pcpu_hot {
- u8 pad[64];
-};
-static_assert(sizeof(struct pcpu_hot) == 64);
-
-DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
-
-/* const-qualified alias to pcpu_hot, aliased by linker. */
-DECLARE_PER_CPU_ALIGNED(const struct pcpu_hot __percpu_seg_override,
- const_pcpu_hot);
-
DECLARE_PER_CPU_HOT(struct task_struct *, current_task);
/* const-qualified alias provided by the linker. */
DECLARE_PER_CPU_HOT(struct task_struct * const, const_current_task);
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index f4ec6bcb2a5e..ba78ee8fdb21 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2014,10 +2014,6 @@ static __init int setup_clearcpuid(char *arg)
}
__setup("clearcpuid=", setup_clearcpuid);
-DEFINE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
-EXPORT_PER_CPU_SYMBOL(pcpu_hot);
-EXPORT_PER_CPU_SYMBOL(const_pcpu_hot);
-
DEFINE_PER_CPU_HOT(struct task_struct *, current_task) = &init_task;
EXPORT_PER_CPU_SYMBOL(current_task);
EXPORT_PER_CPU_SYMBOL(const_current_task);
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 3c87bb620434..0cfdaa0e05a0 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -43,7 +43,6 @@ ENTRY(phys_startup_64)
#endif
jiffies = jiffies_64;
-const_pcpu_hot = pcpu_hot;
const_current_task = current_task;
const_cpu_current_top_of_stack = cpu_current_top_of_stack;
--
2.48.1