Commit 5579fd7e authored by Tejun Heo's avatar Tejun Heo
Browse files

Merge branch 'for-next' into for-linus 

* pcpu_chunk_page_occupied() doesn't exist in for-next.
* pcpu_chunk_addr_search() updated to use raw_smp_processor_id().

Conflicts:
	mm/percpu.c
parents 04a13c7c c2a7e818

Documentation/kernel-parameters.txt

+6 −5
Original line number Diff line number Diff line
@@ -1919,11 +1919,12 @@ and is between 256 and 4096 characters. It is defined in the file 
			Format: { 0 | 1 }

			See arch/parisc/kernel/pdc_chassis.c



	percpu_alloc=	[X86] Select which percpu first chunk allocator to use.

			Allowed values are one of "lpage", "embed" and "4k".

			See comments in arch/x86/kernel/setup_percpu.c for

			details on each allocator.  This parameter is primarily

			for debugging and performance comparison.

	percpu_alloc=	Select which percpu first chunk allocator to use.

			Currently supported values are "embed" and "page".

			Archs may support subset or none of the	selections.

			See comments in mm/percpu.c for details on each

			allocator.  This parameter is primarily	for debugging

			and performance comparison.



	pf.		[PARIDE]

			See Documentation/blockdev/paride.txt.

Makefile

+1 −1
Original line number Diff line number Diff line
@@ -325,7 +325,7 @@ CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 
MODFLAGS	= -DMODULE

CFLAGS_MODULE   = $(MODFLAGS)

AFLAGS_MODULE   = $(MODFLAGS)

LDFLAGS_MODULE  =

LDFLAGS_MODULE  = -T $(srctree)/scripts/module-common.lds

CFLAGS_KERNEL	=

AFLAGS_KERNEL	=

CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage

arch/alpha/include/asm/percpu.h

+8 −92
Original line number Diff line number Diff line 
#ifndef __ALPHA_PERCPU_H

#define __ALPHA_PERCPU_H



#include <linux/compiler.h>

#include <linux/threads.h>

#include <linux/percpu-defs.h>



/*

 * Determine the real variable name from the name visible in the

 * kernel sources.

 */

#define per_cpu_var(var) per_cpu__##var



#ifdef CONFIG_SMP



/*

 * per_cpu_offset() is the offset that has to be added to a

 * percpu variable to get to the instance for a certain processor.

 */

extern unsigned long __per_cpu_offset[NR_CPUS];



#define per_cpu_offset(x) (__per_cpu_offset[x])



#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())

#ifdef CONFIG_DEBUG_PREEMPT

#define my_cpu_offset per_cpu_offset(smp_processor_id())

#else

#define my_cpu_offset __my_cpu_offset

#endif



#ifndef MODULE

#define SHIFT_PERCPU_PTR(var, offset) RELOC_HIDE(&per_cpu_var(var), (offset))

#define PER_CPU_DEF_ATTRIBUTES

#else

/*

 * To calculate addresses of locally defined variables, GCC uses 32-bit

 * displacement from the GP. Which doesn't work for per cpu variables in

 * modules, as an offset to the kernel per cpu area is way above 4G.

 * To calculate addresses of locally defined variables, GCC uses

 * 32-bit displacement from the GP. Which doesn't work for per cpu

 * variables in modules, as an offset to the kernel per cpu area is

 * way above 4G.

 *

 * This forces allocation of a GOT entry for per cpu variable using

 * ldq instruction with a 'literal' relocation.

 */

#define SHIFT_PERCPU_PTR(var, offset) ({		\

	extern int simple_identifier_##var(void);	\

	unsigned long __ptr, tmp_gp;			\

	asm (  "br	%1, 1f		  	      \n\

	1:	ldgp	%1, 0(%1)	    	      \n\

		ldq %0, per_cpu__" #var"(%1)\t!literal"		\

		: "=&r"(__ptr), "=&r"(tmp_gp));		\

	(typeof(&per_cpu_var(var)))(__ptr + (offset)); })



#define PER_CPU_DEF_ATTRIBUTES	__used



#endif /* MODULE */



/*

 * A percpu variable may point to a discarded regions. The following are

 * established ways to produce a usable pointer from the percpu variable

 * offset.

 * Always use weak definitions for percpu variables in modules.

 */

#define per_cpu(var, cpu) \

	(*SHIFT_PERCPU_PTR(var, per_cpu_offset(cpu)))

#define __get_cpu_var(var) \

	(*SHIFT_PERCPU_PTR(var, my_cpu_offset))

#define __raw_get_cpu_var(var) \

	(*SHIFT_PERCPU_PTR(var, __my_cpu_offset))



#else /* ! SMP */



#define per_cpu(var, cpu)		(*((void)(cpu), &per_cpu_var(var)))

#define __get_cpu_var(var)		per_cpu_var(var)

#define __raw_get_cpu_var(var)		per_cpu_var(var)



#define PER_CPU_DEF_ATTRIBUTES



#endif /* SMP */



#ifdef CONFIG_SMP

#define PER_CPU_BASE_SECTION ".data.percpu"

#else

#define PER_CPU_BASE_SECTION ".data"

#endif



#ifdef CONFIG_SMP



#ifdef MODULE

#define PER_CPU_SHARED_ALIGNED_SECTION ""

#else

#define PER_CPU_SHARED_ALIGNED_SECTION ".shared_aligned"

#endif

#define PER_CPU_FIRST_SECTION ".first"



#else



#define PER_CPU_SHARED_ALIGNED_SECTION ""

#define PER_CPU_FIRST_SECTION ""



#if defined(MODULE) && defined(CONFIG_SMP)

#define ARCH_NEEDS_WEAK_PER_CPU

#endif



#define PER_CPU_ATTRIBUTES

#include <asm-generic/percpu.h>



#endif /* __ALPHA_PERCPU_H */

arch/alpha/include/asm/tlbflush.h

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#define _ALPHA_TLBFLUSH_H



#include <linux/mm.h>

#include <linux/sched.h>

#include <asm/compiler.h>

#include <asm/pgalloc.h>

arch/alpha/kernel/vmlinux.lds.S

+2 −7
Original line number Diff line number Diff line
@@ -134,13 +134,6 @@ SECTIONS 
	__bss_stop = .;

	_end = .;



	/* Sections to be discarded */

	/DISCARD/ : {

		EXIT_TEXT

		EXIT_DATA

		*(.exitcall.exit)

	}



	.mdebug 0 : {

		*(.mdebug)

	}
@@ -150,4 +143,6 @@ SECTIONS 


	STABS_DEBUG

	DWARF_DEBUG



	DISCARDS

}