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x86/boot/smp/32: Fix initial idle stack location on 32-bit kernels 

On 32-bit kernels, the initial idle stack calculation doesn't take into
account the TOP_OF_KERNEL_STACK_PADDING, making the stack end address
inconsistent with other tasks on 32-bit.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/6cf569410bfa84cf923902fc4d628444cace94be.1474480779.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2016-09-21 16:04:03 -05:00 committed by Ingo Molnar
parent 6616a147a7
commit b9b1a9c363
1 changed files with 1 additions and 3 deletions
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4
arch/x86/kernel/smpboot.c
View File

@ -964,9 +964,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
int cpu0_nmi_registered = 0; int cpu0_nmi_registered = 0;
unsigned long timeout; unsigned long timeout;
idle->thread.sp = (unsigned long) (((struct pt_regs *) idle->thread.sp = (unsigned long)task_pt_regs(idle);
(THREAD_SIZE + task_stack_page(idle))) - 1);
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
initial_code = (unsigned long)start_secondary; initial_code = (unsigned long)start_secondary;
initial_stack = idle->thread.sp; initial_stack = idle->thread.sp;