[PATCH] x86-64: Some cleanup and optimization to the processor data a…

…rea.

- Remove unused irqrsp field
- Remove pda->me
- Optimize set_softirq_pending slightly

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/asm-offsets.c

@@ -39,7 +39,6 @@ int main(void)
 	ENTRY(kernelstack); 
 	ENTRY(oldrsp); 
 	ENTRY(pcurrent); 
-	ENTRY(irqrsp);
 	ENTRY(irqcount);
 	ENTRY(cpunumber);
 	ENTRY(irqstackptr);

arch/x86_64/kernel/setup64.c

@@ -119,7 +119,6 @@ void pda_init(int cpu)
 	asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0)); 
 	wrmsrl(MSR_GS_BASE, cpu_pda + cpu);
 
-	pda->me = pda;
 	pda->cpunumber = cpu; 
 	pda->irqcount = -1;
 	pda->kernelstack = 

include/asm-x86_64/hardirq.h

@@ -9,11 +9,12 @@
 
 #define __ARCH_IRQ_STAT 1
 
-/* Generate a lvalue for a pda member. Should fix softirq.c instead to use
-   special access macros. This would generate better code. */ 
-#define __IRQ_STAT(cpu,member) (read_pda(me)->member)
+#define local_softirq_pending() read_pda(__softirq_pending)
 
-#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
+#define __ARCH_SET_SOFTIRQ_PENDING 1
+
+#define set_softirq_pending(x) write_pda(__softirq_pending, (x))
+#define or_softirq_pending(x)  or_pda(__softirq_pending, (x))
 
 /*
  * 'what should we do if we get a hw irq event on an illegal vector'.

include/asm-x86_64/pda.h

@@ -10,10 +10,8 @@
 struct x8664_pda {
 	struct task_struct *pcurrent;	/* Current process */
 	unsigned long data_offset;	/* Per cpu data offset from linker address */
-	struct x8664_pda *me;	    /* Pointer to itself */  
 	unsigned long kernelstack;  /* top of kernel stack for current */ 
 	unsigned long oldrsp; 	    /* user rsp for system call */
-	unsigned long irqrsp;	    /* Old rsp for interrupts. */ 
         int irqcount;		    /* Irq nesting counter. Starts with -1 */  	
 	int cpunumber;		    /* Logical CPU number */
 	char *irqstackptr;	/* top of irqstack */
@@ -42,13 +40,14 @@ extern void __bad_pda_field(void);
 #define pda_offset(field) offsetof(struct x8664_pda, field)
 
 #define pda_to_op(op,field,val) do { \
+	typedef typeof_field(struct x8664_pda, field) T__; \
        switch (sizeof_field(struct x8664_pda, field)) { 		\
 case 2: \
-asm volatile(op "w %0,%%gs:%P1"::"r" (val),"i"(pda_offset(field)):"memory"); break; \
+asm volatile(op "w %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \
 case 4: \
-asm volatile(op "l %0,%%gs:%P1"::"r" (val),"i"(pda_offset(field)):"memory"); break; \
+asm volatile(op "l %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \
 case 8: \
-asm volatile(op "q %0,%%gs:%P1"::"r" (val),"i"(pda_offset(field)):"memory"); break; \
+asm volatile(op "q %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \
        default: __bad_pda_field(); 					\
        } \
        } while (0)
@@ -58,7 +57,7 @@ asm volatile(op "q %0,%%gs:%P1"::"r" (val),"i"(pda_offset(field)):"memory"); bre
  * Unfortunately removing them causes all hell to break lose currently.
  */
 #define pda_from_op(op,field) ({ \
-       typedef typeof_field(struct x8664_pda, field) T__; T__ ret__; \
+       typeof_field(struct x8664_pda, field) ret__; \
        switch (sizeof_field(struct x8664_pda, field)) { 		\
 case 2: \
 asm volatile(op "w %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\
@@ -75,6 +74,7 @@ asm volatile(op "q %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); b
 #define write_pda(field,val) pda_to_op("mov",field,val)
 #define add_pda(field,val) pda_to_op("add",field,val)
 #define sub_pda(field,val) pda_to_op("sub",field,val)
+#define or_pda(field,val) pda_to_op("or",field,val)
 
 #endif
 

include/linux/interrupt.h

@@ -57,6 +57,11 @@ extern void disable_irq(unsigned int irq);
 extern void enable_irq(unsigned int irq);
 #endif
 
+#ifndef __ARCH_SET_SOFTIRQ_PENDING
+#define set_softirq_pending(x) (local_softirq_pending() = (x))
+#define or_softirq_pending(x)  (local_softirq_pending() |= (x))
+#endif
+
 /*
  * Temporary defines for UP kernels, until all code gets fixed.
  */
@@ -123,7 +128,7 @@ struct softirq_action
 asmlinkage void do_softirq(void);
 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
 extern void softirq_init(void);
-#define __raise_softirq_irqoff(nr) do { local_softirq_pending() |= 1UL << (nr); } while (0)
+#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
 extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
 extern void FASTCALL(raise_softirq(unsigned int nr));
 

kernel/softirq.c

@@ -84,7 +84,7 @@ asmlinkage void __do_softirq(void)
 	cpu = smp_processor_id();
 restart:
 	/* Reset the pending bitmask before enabling irqs */
-	local_softirq_pending() = 0;
+	set_softirq_pending(0);
 
 	local_irq_enable();