ed8d9adf35
This is very useful for some common things like 'get_current()' and
'get_thread_info()', which can be used multiple times in a function, and
where the result is cacheable.
tj: Added the magical undocumented "P" modifier to UP __percpu_arg()
to force gcc to dereference the pointer value passed in via the
"p" input constraint. Without this, percpu_read_stable() returns
the address of the percpu variable. Also added comment explaining
the difference between percpu_read() and percpu_read_stable().
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
21 lines
402 B
C
21 lines
402 B
C
#ifndef _ASM_X86_CURRENT_H
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#define _ASM_X86_CURRENT_H
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#include <linux/compiler.h>
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#include <asm/percpu.h>
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#ifndef __ASSEMBLY__
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struct task_struct;
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DECLARE_PER_CPU(struct task_struct *, current_task);
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static __always_inline struct task_struct *get_current(void)
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{
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return percpu_read_stable(current_task);
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}
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#define current get_current()
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_CURRENT_H */
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