linux/arch/x86/include/asm/current.h

#ifndef _ASM_X86_CURRENT_H
#define _ASM_X86_CURRENT_H

#include <linux/compiler.h>
#include <asm/percpu.h>

#ifndef __ASSEMBLY__
struct task_struct;

DECLARE_PER_CPU(struct task_struct *, current_task);

static __always_inline struct task_struct *get_current(void)
{
	return percpu_read_stable(current_task);
}

#define current get_current()

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_CURRENT_H */
x86: Fix ASM_X86__ header guards Change header guards named "ASM_X86__" to "_ASM_X86_" since: a. the double underscore is ugly and pointless. b. no leading underscore violates namespace constraints. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 2008-10-23 05:26:29 +00:00			`#ifndef _ASM_X86_CURRENT_H`
			`#define _ASM_X86_CURRENT_H`
x86: unify current.h Simply stitch these together. There are just two definitions that are shared but the file is resonably small and putting these things together shows that further unifications requires a unification of the per cpu / pda handling between both arches. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2008-05-10 02:09:48 +00:00
			`#include <linux/compiler.h>`
			`#include <asm/percpu.h>`

x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit. Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> 2009-01-18 15:38:58 +00:00			`#ifndef __ASSEMBLY__`
x86: unify current.h Simply stitch these together. There are just two definitions that are shared but the file is resonably small and putting these things together shows that further unifications requires a unification of the per cpu / pda handling between both arches. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2008-05-10 02:09:48 +00:00			`struct task_struct;`

			`DECLARE_PER_CPU(struct task_struct *, current_task);`

			`static __always_inline struct task_struct *get_current(void)`
			`{`
x86, percpu: Add 'percpu_read_stable()' interface for cacheable accesses 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> 2009-08-03 05:08:48 +00:00			`return percpu_read_stable(current_task);`
x86: unify current.h Simply stitch these together. There are just two definitions that are shared but the file is resonably small and putting these things together shows that further unifications requires a unification of the per cpu / pda handling between both arches. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2008-05-10 02:09:48 +00:00			`}`

x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit. Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> 2009-01-18 15:38:58 +00:00			`#define current get_current()`
x86: unify current.h Simply stitch these together. There are just two definitions that are shared but the file is resonably small and putting these things together shows that further unifications requires a unification of the per cpu / pda handling between both arches. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2008-05-10 02:09:48 +00:00
			`#endif /* __ASSEMBLY__ */`

x86: Fix ASM_X86__ header guards Change header guards named "ASM_X86__" to "_ASM_X86_" since: a. the double underscore is ugly and pointless. b. no leading underscore violates namespace constraints. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 2008-10-23 05:26:29 +00:00			`#endif /* _ASM_X86_CURRENT_H */`