Commit 27e74da9 authored Feb 20, 2012 by Linus Torvalds

i387: export 'fpu_owner_task' per-cpu variable



(And define it properly for x86-32, which had its 'current_task'
declaration in separate from x86-64)

Bitten by my dislike for modules on the machines I use, and the fact
that apparently nobody else actually wanted to test the patches I sent
out.

Snif. Nobody else cares.

Anyway, we probably should uninline the 'kernel_fpu_begin()' function
that is what modules actually use and that references this, but this is
the minimal fix for now.

Reported-by: Josh Boyer <jwboyer@gmail.com>
Reported-and-tested-by: Jongman Heo <jongman.heo@samsung.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 8ebbfb49

arch/x86/kernel/cpu/common.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1045,6 +1045,7 @@ DEFINE_PER_CPU(char *, irq_stack_ptr) =
		DEFINE_PER_CPU(unsigned int, irq_count) = -1;

		DEFINE_PER_CPU(struct task_struct *, fpu_owner_task);
		EXPORT_PER_CPU_SYMBOL(fpu_owner_task);

		/*
		* Special IST stacks which the CPU switches to when it calls
		@@ -1113,6 +1114,8 @@ void debug_stack_reset(void)

		DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
		EXPORT_PER_CPU_SYMBOL(current_task);
		DEFINE_PER_CPU(struct task_struct *, fpu_owner_task);
		EXPORT_PER_CPU_SYMBOL(fpu_owner_task);

		#ifdef CONFIG_CC_STACKPROTECTOR
		DEFINE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);