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authorAnton Blanchard <anton@samba.org>2010-01-31 20:30:23 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-02-17 14:02:48 +1100
commit8c007bfdf1bab536f824d91fccc76596c18aba78 (patch)
tree07bd7c2ce8b016d0d48bd2eb919f0d10eacdf4c5 /arch/powerpc/include
parent8d3d50bf1913561ef3b1f5b53115c5a481ba9b1e (diff)
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: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/hardirq.h23
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/hardirq.h b/arch/powerpc/include/asm/hardirq.h
index fb3c05a0cbb..9bf3467581b 100644
--- a/arch/powerpc/include/asm/hardirq.h
+++ b/arch/powerpc/include/asm/hardirq.h
@@ -1 +1,22 @@
-#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 */