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Commit c83bb885 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'parisc-for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 

Pull parisc update from Helge Deller:
 "The second round of parisc updates for 3.10 includes build fixes and
  enhancements to utilize irq stacks, fixes SMP races when updating PTE
  and TLB entries by proper locking and makes the search for the correct
  cross compiler more robust on Debian and Gentoo."

* 'parisc-for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: make default cross compiler search more robust (v3)
  parisc: fix SMP races when updating PTE and TLB entries in entry.S
  parisc: implement irq stacks - part 2 (v2)
parents dbbffe68 6880b015

arch/parisc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -245,7 +245,7 @@ config SMP 


config IRQSTACKS

	bool "Use separate kernel stacks when processing interrupts"

	default n

	default y

	help

	  If you say Y here the kernel will use separate kernel stacks

	  for handling hard and soft interrupts.  This can help avoid

arch/parisc/Makefile

+9 −12
Original line number Diff line number Diff line
@@ -23,23 +23,20 @@ NM = sh $(srctree)/arch/parisc/nm 
CHECKFLAGS	+= -D__hppa__=1

LIBGCC		= $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)



MACHINE		:= $(shell uname -m)

NATIVE		:= $(if $(filter parisc%,$(MACHINE)),1,0)



ifdef CONFIG_64BIT

UTS_MACHINE	:= parisc64

CHECKFLAGS	+= -D__LP64__=1 -m64

WIDTH		:= 64

CC_ARCHES	= hppa64

else # 32-bit

WIDTH		:=

CC_ARCHES	= hppa hppa2.0 hppa1.1

endif



# attempt to help out folks who are cross-compiling

ifeq ($(NATIVE),1)

CROSS_COMPILE	:= hppa$(WIDTH)-linux-

else

ifneq ($(SUBARCH),$(UTS_MACHINE))

	ifeq ($(CROSS_COMPILE),)

 CROSS_COMPILE	:= hppa$(WIDTH)-linux-gnu-

		CC_SUFFIXES = linux linux-gnu unknown-linux-gnu

		CROSS_COMPILE := $(call cc-cross-prefix, \

			$(foreach a,$(CC_ARCHES), \

			$(foreach s,$(CC_SUFFIXES),$(a)-$(s)-)))

	endif

endif

arch/parisc/include/asm/hardirq.h

+9 −0
Original line number Diff line number Diff line
@@ -11,10 +11,18 @@ 
#include <linux/threads.h>

#include <linux/irq.h>



#ifdef CONFIG_IRQSTACKS

#define __ARCH_HAS_DO_SOFTIRQ

#endif



typedef struct {

	unsigned int __softirq_pending;

#ifdef CONFIG_DEBUG_STACKOVERFLOW

	unsigned int kernel_stack_usage;

#ifdef CONFIG_IRQSTACKS

	unsigned int irq_stack_usage;

	unsigned int irq_stack_counter;

#endif

#endif

#ifdef CONFIG_SMP

	unsigned int irq_resched_count;
@@ -28,6 +36,7 @@ DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); 
#define __ARCH_IRQ_STAT

#define __IRQ_STAT(cpu, member) (irq_stat[cpu].member)

#define inc_irq_stat(member)	this_cpu_inc(irq_stat.member)

#define __inc_irq_stat(member)	__this_cpu_inc(irq_stat.member)

#define local_softirq_pending()	this_cpu_read(irq_stat.__softirq_pending)



#define __ARCH_SET_SOFTIRQ_PENDING

arch/parisc/include/asm/processor.h

+3 −0
Original line number Diff line number Diff line
@@ -63,10 +63,13 @@ 
 */

#ifdef __KERNEL__



#include <linux/spinlock_types.h>



#define IRQ_STACK_SIZE      (4096 << 2) /* 16k irq stack size */



union irq_stack_union {

	unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];

	raw_spinlock_t lock;

};



DECLARE_PER_CPU(union irq_stack_union, irq_stack_union);

arch/parisc/kernel/entry.S

+83 −72
Original line number Diff line number Diff line
@@ -452,9 +452,41 @@ 
	L2_ptep		\pgd,\pte,\index,\va,\fault

	.endm



	/* Acquire pa_dbit_lock lock. */

	.macro		dbit_lock	spc,tmp,tmp1

#ifdef CONFIG_SMP

	cmpib,COND(=),n	0,\spc,2f

	load32		PA(pa_dbit_lock),\tmp

1:	LDCW		0(\tmp),\tmp1

	cmpib,COND(=)	0,\tmp1,1b

	nop

2:

#endif

	.endm



	/* Release pa_dbit_lock lock without reloading lock address. */

	.macro		dbit_unlock0	spc,tmp

#ifdef CONFIG_SMP

	or,COND(=)	%r0,\spc,%r0

	stw             \spc,0(\tmp)

#endif

	.endm



	/* Release pa_dbit_lock lock. */

	.macro		dbit_unlock1	spc,tmp

#ifdef CONFIG_SMP

	load32		PA(pa_dbit_lock),\tmp

	dbit_unlock0	\spc,\tmp

#endif

	.endm



	/* Set the _PAGE_ACCESSED bit of the PTE.  Be clever and

	 * don't needlessly dirty the cache line if it was already set */

	.macro		update_ptep	ptep,pte,tmp,tmp1

	.macro		update_ptep	spc,ptep,pte,tmp,tmp1

#ifdef CONFIG_SMP

	or,COND(=)	%r0,\spc,%r0

	LDREG		0(\ptep),\pte

#endif

	ldi		_PAGE_ACCESSED,\tmp1

	or		\tmp1,\pte,\tmp

	and,COND(<>)	\tmp1,\pte,%r0
@@ -463,7 +495,11 @@ 


	/* Set the dirty bit (and accessed bit).  No need to be

	 * clever, this is only used from the dirty fault */

	.macro		update_dirty	ptep,pte,tmp

	.macro		update_dirty	spc,ptep,pte,tmp

#ifdef CONFIG_SMP

	or,COND(=)	%r0,\spc,%r0

	LDREG		0(\ptep),\pte

#endif

	ldi		_PAGE_ACCESSED|_PAGE_DIRTY,\tmp

	or		\tmp,\pte,\pte

	STREG		\pte,0(\ptep)
@@ -1111,11 +1147,13 @@ dtlb_miss_20w: 


	L3_ptep		ptp,pte,t0,va,dtlb_check_alias_20w



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot

	

	idtlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1135,11 +1173,13 @@ nadtlb_miss_20w: 


	L3_ptep		ptp,pte,t0,va,nadtlb_check_alias_20w



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot



	idtlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1161,7 +1201,8 @@ dtlb_miss_11: 


	L2_ptep		ptp,pte,t0,va,dtlb_check_alias_11



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb_11	spc,pte,prot
@@ -1172,6 +1213,7 @@ dtlb_miss_11: 
	idtlbp		prot,(%sr1,va)



	mtsp		t0, %sr1	/* Restore sr1 */

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1192,7 +1234,8 @@ nadtlb_miss_11: 


	L2_ptep		ptp,pte,t0,va,nadtlb_check_alias_11



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb_11	spc,pte,prot
@@ -1204,6 +1247,7 @@ nadtlb_miss_11: 
	idtlbp		prot,(%sr1,va)



	mtsp		t0, %sr1	/* Restore sr1 */

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1224,13 +1268,15 @@ dtlb_miss_20: 


	L2_ptep		ptp,pte,t0,va,dtlb_check_alias_20



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot



	f_extend	pte,t0



	idtlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1250,13 +1296,15 @@ nadtlb_miss_20: 


	L2_ptep		ptp,pte,t0,va,nadtlb_check_alias_20



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot



	f_extend	pte,t0

	

        idtlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1357,11 +1405,13 @@ itlb_miss_20w: 


	L3_ptep		ptp,pte,t0,va,itlb_fault



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot

	

	iitlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1379,11 +1429,13 @@ naitlb_miss_20w: 


	L3_ptep		ptp,pte,t0,va,naitlb_check_alias_20w



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot



	iitlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1405,7 +1457,8 @@ itlb_miss_11: 


	L2_ptep		ptp,pte,t0,va,itlb_fault



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb_11	spc,pte,prot
@@ -1416,6 +1469,7 @@ itlb_miss_11: 
	iitlbp		prot,(%sr1,va)



	mtsp		t0, %sr1	/* Restore sr1 */

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1427,7 +1481,8 @@ naitlb_miss_11: 


	L2_ptep		ptp,pte,t0,va,naitlb_check_alias_11



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb_11	spc,pte,prot
@@ -1438,6 +1493,7 @@ naitlb_miss_11: 
	iitlbp		prot,(%sr1,va)



	mtsp		t0, %sr1	/* Restore sr1 */

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1459,13 +1515,15 @@ itlb_miss_20: 


	L2_ptep		ptp,pte,t0,va,itlb_fault



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot



	f_extend	pte,t0	



	iitlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1477,13 +1535,15 @@ naitlb_miss_20: 


	L2_ptep		ptp,pte,t0,va,naitlb_check_alias_20



	update_ptep	ptp,pte,t0,t1

	dbit_lock	spc,t0,t1

	update_ptep	spc,ptp,pte,t0,t1



	make_insert_tlb	spc,pte,prot



	f_extend	pte,t0



	iitlbt          pte,prot

	dbit_unlock1	spc,t0



	rfir

	nop
@@ -1507,29 +1567,13 @@ dbit_trap_20w: 


	L3_ptep		ptp,pte,t0,va,dbit_fault



#ifdef CONFIG_SMP

	cmpib,COND(=),n        0,spc,dbit_nolock_20w

	load32		PA(pa_dbit_lock),t0



dbit_spin_20w:

	LDCW		0(t0),t1

	cmpib,COND(=)         0,t1,dbit_spin_20w

	nop



dbit_nolock_20w:

#endif

	update_dirty	ptp,pte,t1

	dbit_lock	spc,t0,t1

	update_dirty	spc,ptp,pte,t1



	make_insert_tlb	spc,pte,prot

		

	idtlbt          pte,prot

#ifdef CONFIG_SMP

	cmpib,COND(=),n        0,spc,dbit_nounlock_20w

	ldi             1,t1

	stw             t1,0(t0)



dbit_nounlock_20w:

#endif

	dbit_unlock0	spc,t0



	rfir

	nop
@@ -1543,18 +1587,8 @@ dbit_trap_11: 


	L2_ptep		ptp,pte,t0,va,dbit_fault



#ifdef CONFIG_SMP

	cmpib,COND(=),n        0,spc,dbit_nolock_11

	load32		PA(pa_dbit_lock),t0



dbit_spin_11:

	LDCW		0(t0),t1

	cmpib,=         0,t1,dbit_spin_11

	nop



dbit_nolock_11:

#endif

	update_dirty	ptp,pte,t1

	dbit_lock	spc,t0,t1

	update_dirty	spc,ptp,pte,t1



	make_insert_tlb_11	spc,pte,prot
@@ -1565,13 +1599,7 @@ dbit_nolock_11: 
	idtlbp		prot,(%sr1,va)



	mtsp            t1, %sr1     /* Restore sr1 */

#ifdef CONFIG_SMP

	cmpib,COND(=),n        0,spc,dbit_nounlock_11

	ldi             1,t1

	stw             t1,0(t0)



dbit_nounlock_11:

#endif

	dbit_unlock0	spc,t0



	rfir

	nop
@@ -1583,32 +1611,15 @@ dbit_trap_20: 


	L2_ptep		ptp,pte,t0,va,dbit_fault



#ifdef CONFIG_SMP

	cmpib,COND(=),n        0,spc,dbit_nolock_20

	load32		PA(pa_dbit_lock),t0



dbit_spin_20:

	LDCW		0(t0),t1

	cmpib,=         0,t1,dbit_spin_20

	nop



dbit_nolock_20:

#endif

	update_dirty	ptp,pte,t1

	dbit_lock	spc,t0,t1

	update_dirty	spc,ptp,pte,t1



	make_insert_tlb	spc,pte,prot



	f_extend	pte,t1

	

        idtlbt          pte,prot



#ifdef CONFIG_SMP

	cmpib,COND(=),n        0,spc,dbit_nounlock_20

	ldi             1,t1

	stw             t1,0(t0)



dbit_nounlock_20:

#endif

	dbit_unlock0	spc,t0



	rfir

	nop