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Commit 8c007bfd authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
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powerpc: Reduce footprint of irq_stat 



PowerPC is currently using asm-generic/hardirq.h which statically allocates an
NR_CPUS irq_stat array. Switch to an arch specific implementation which uses
per cpu data:

On a kernel with NR_CPUS=1024, this saves quite a lot of memory:

   text    data     bss      dec         hex    filename
8767938 2944132 1636796 13348866         cbb002 vmlinux.baseline
8767779 2944260 1505724 13217763         c9afe3 vmlinux.irq_cpustat

A saving of around 128kB.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 8d3d50bf

arch/powerpc/include/asm/hardirq.h

+22 −1
Original line number Diff line number Diff line 
#include <asm-generic/hardirq.h>
 
#ifndef _ASM_POWERPC_HARDIRQ_H

#define _ASM_POWERPC_HARDIRQ_H



#include <linux/threads.h>

#include <linux/irq.h>



typedef struct {

	unsigned int __softirq_pending;

} ____cacheline_aligned irq_cpustat_t;



DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);



#define __ARCH_IRQ_STAT



#define local_softirq_pending()	__get_cpu_var(irq_stat).__softirq_pending



static inline void ack_bad_irq(unsigned int irq)

{

	printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq);

}



#endif /* _ASM_POWERPC_HARDIRQ_H */

arch/powerpc/kernel/irq.c

+3 −0
Original line number Diff line number Diff line
@@ -73,6 +73,9 @@ 
#define CREATE_TRACE_POINTS

#include <asm/trace.h>



DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);

EXPORT_PER_CPU_SYMBOL(irq_stat);



int __irq_offset_value;

static int ppc_spurious_interrupts;