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x86/entry: Remove unused 'kernel_stack' per-cpu variable 

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1429889495-27850-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Denys Vlasenko 2015-04-24 17:31:34 +02:00 committed by Ingo Molnar
parent 63332a8455
commit fed7c3f0f7
5 changed files with 1 additions and 15 deletions
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2
arch/x86/include/asm/thread_info.h
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@ -177,8 +177,6 @@ struct thread_info {
*/ */
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
DECLARE_PER_CPU(unsigned long, kernel_stack);
static inline struct thread_info *current_thread_info(void) static inline struct thread_info *current_thread_info(void)
{ {
return (struct thread_info *)(current_top_of_stack() - THREAD_SIZE); return (struct thread_info *)(current_top_of_stack() - THREAD_SIZE);

4
arch/x86/kernel/cpu/common.c
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@ -1155,10 +1155,6 @@ static __init int setup_disablecpuid(char *arg)
} }
__setup("clearcpuid=", setup_disablecpuid); __setup("clearcpuid=", setup_disablecpuid);
DEFINE_PER_CPU(unsigned long, kernel_stack) =
(unsigned long)&init_thread_union + THREAD_SIZE;
EXPORT_PER_CPU_SYMBOL(kernel_stack);
#ifdef CONFIG_X86_64 #ifdef CONFIG_X86_64
struct desc_ptr idt_descr = { NR_VECTORS * 16 - 1, (unsigned long) idt_table }; struct desc_ptr idt_descr = { NR_VECTORS * 16 - 1, (unsigned long) idt_table };
struct desc_ptr debug_idt_descr = { NR_VECTORS * 16 - 1, struct desc_ptr debug_idt_descr = { NR_VECTORS * 16 - 1,

5
arch/x86/kernel/process_32.c
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@ -302,13 +302,10 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
arch_end_context_switch(next_p); arch_end_context_switch(next_p);
/* /*
* Reload esp0, kernel_stack, and current_top_of_stack. This changes * Reload esp0 and cpu_current_top_of_stack. This changes
* current_thread_info(). * current_thread_info().
*/ */
load_sp0(tss, next); load_sp0(tss, next);
this_cpu_write(kernel_stack,
(unsigned long)task_stack_page(next_p) +
THREAD_SIZE);
this_cpu_write(cpu_current_top_of_stack, this_cpu_write(cpu_current_top_of_stack,
(unsigned long)task_stack_page(next_p) + (unsigned long)task_stack_page(next_p) +
THREAD_SIZE); THREAD_SIZE);

3
arch/x86/kernel/process_64.c
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@ -409,9 +409,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/* Reload esp0 and ss1. This changes current_thread_info(). */ /* Reload esp0 and ss1. This changes current_thread_info(). */
load_sp0(tss, next); load_sp0(tss, next);
this_cpu_write(kernel_stack,
(unsigned long)task_stack_page(next_p) + THREAD_SIZE);
/* /*
* Now maybe reload the debug registers and handle I/O bitmaps * Now maybe reload the debug registers and handle I/O bitmaps
*/ */

2
arch/x86/kernel/smpboot.c
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@ -792,8 +792,6 @@ void common_cpu_up(unsigned int cpu, struct task_struct *idle)
clear_tsk_thread_flag(idle, TIF_FORK); clear_tsk_thread_flag(idle, TIF_FORK);
initial_gs = per_cpu_offset(cpu); initial_gs = per_cpu_offset(cpu);
#endif #endif
per_cpu(kernel_stack, cpu) =
(unsigned long)task_stack_page(idle) + THREAD_SIZE;
} }
/* /*