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Message-Id: <20081225213640.50F3.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date: Thu, 25 Dec 2008 21:40:52 +0900 (JST)
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To: Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Cc: kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH for -tip] proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c
> > > +#include <linux/irq.h>
> >
> > looks good, but linux/irq.h cannot be included on all architectures. (for
> > example s390 has no notion of 'hardirqs'). But we created linux/irqnr.h
> > for this purpose - so including that should work better.
>
> Oh, thanks good explain.
> I'll fix soon.
next spin is here.
I confirmed three architecture.
1. alpha (without SPARSE_IRQ, build test by cross compiler only)
2. ia64 (without SPARSE_IRQ)
3. x86_64 (with SPARSE_IRQ)
==
Subject: [PATCH] proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c
Impact: cleanup
commit 240d367b4e6c6e3c5075e034db14dba60a6f5fa7 has a bit strange analysis.
irq_desc() can be used old architecuture.
but in old code, for_each_irq_desc() sit in <linux/irq.h> and its header
can't be included from architecture independend code.
Right solusion is
- move for_each_irq_desc() to <linux/irqnr.h>
- stat.c include <linux/irqnr.h>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Yinghai Lu <yinghai@...nel.org>
CC: Ingo Molnar <mingo@...e.hu>
---
fs/proc/stat.c | 11 +++++------
include/linux/irq.h | 14 ++------------
include/linux/irqnr.h | 26 ++++++++++++++------------
kernel/irq/handle.c | 9 +++++++--
4 files changed, 28 insertions(+), 32 deletions(-)
Index: b/fs/proc/stat.c
===================================================================
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -9,6 +9,7 @@
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/time.h>
+#include <linux/irqnr.h>
#include <asm/cputime.h>
#ifndef arch_irq_stat_cpu
@@ -27,6 +28,7 @@ static int show_stat(struct seq_file *p,
u64 sum = 0;
struct timespec boottime;
unsigned int per_irq_sum;
+ struct irq_desc *desc;
user = nice = system = idle = iowait =
irq = softirq = steal = cputime64_zero;
@@ -44,11 +46,10 @@ static int show_stat(struct seq_file *p,
softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
- for_each_irq_nr(j) {
-#ifdef CONFIG_SPARSE_IRQ
- if (!irq_to_desc(j))
+ for_each_irq_desc(j, desc) {
+ if (!desc)
continue;
-#endif
+
sum += kstat_irqs_cpu(j, i);
}
sum += arch_irq_stat_cpu(i);
@@ -95,12 +96,10 @@ static int show_stat(struct seq_file *p,
/* sum again ? it could be updated? */
for_each_irq_nr(j) {
per_irq_sum = 0;
-#ifdef CONFIG_SPARSE_IRQ
if (!irq_to_desc(j)) {
seq_printf(p, " %u", per_irq_sum);
continue;
}
-#endif
for_each_possible_cpu(i)
per_irq_sum += kstat_irqs_cpu(j, i);
Index: b/include/linux/irq.h
===================================================================
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -204,32 +204,22 @@ extern void arch_free_chip_data(struct i
#ifndef CONFIG_SPARSE_IRQ
extern struct irq_desc irq_desc[NR_IRQS];
-static inline struct irq_desc *irq_to_desc(unsigned int irq)
-{
- return (irq < NR_IRQS) ? irq_desc + irq : NULL;
-}
static inline struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
{
return irq_to_desc(irq);
}
-#else
+#else /* CONFIG_SPARSE_IRQ */
-extern struct irq_desc *irq_to_desc(unsigned int irq);
extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
-# define for_each_irq_desc(irq, desc) \
- for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs; irq++, desc = irq_to_desc(irq))
-# define for_each_irq_desc_reverse(irq, desc) \
- for (irq = nr_irqs - 1, desc = irq_to_desc(irq); irq >= 0; irq--, desc = irq_to_desc(irq))
-
#define kstat_irqs_this_cpu(DESC) \
((DESC)->kstat_irqs[smp_processor_id()])
#define kstat_incr_irqs_this_cpu(irqno, DESC) \
((DESC)->kstat_irqs[smp_processor_id()]++)
-#endif
+#endif /* CONFIG_SPARSE_IRQ */
static inline struct irq_desc *
irq_remap_to_desc(unsigned int irq, struct irq_desc *desc)
Index: b/include/linux/irqnr.h
===================================================================
--- a/include/linux/irqnr.h
+++ b/include/linux/irqnr.h
@@ -11,24 +11,26 @@
# define nr_irqs NR_IRQS
# define for_each_irq_desc(irq, desc) \
- for (irq = 0; irq < nr_irqs; irq++)
+ for (irq = 0, desc = NULL; irq < nr_irqs; irq++)
# define for_each_irq_desc_reverse(irq, desc) \
- for (irq = nr_irqs - 1; irq >= 0; irq--)
-#else
+ for (irq = nr_irqs - 1, desc = NULL; irq >= 0; irq--)
+#else /* CONFIG_GENERIC_HARDIRQS */
extern int nr_irqs;
+struct irq_desc;
-#ifndef CONFIG_SPARSE_IRQ
+# define for_each_irq_desc(irq, desc) \
+ for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs; \
+ irq++, desc = irq_to_desc(irq))
-struct irq_desc;
-# define for_each_irq_desc(irq, desc) \
- for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
-# define for_each_irq_desc_reverse(irq, desc) \
- for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1); \
- irq >= 0; irq--, desc--)
-#endif
-#endif
+# define for_each_irq_desc_reverse(irq, desc) \
+ for (irq = nr_irqs - 1, desc = irq_to_desc(irq); irq >= 0; \
+ irq--, desc = irq_to_desc(irq))
+
+extern struct irq_desc *irq_to_desc(unsigned int irq);
+
+#endif /* CONFIG_GENERIC_HARDIRQS */
#define for_each_irq_nr(irq) \
for (irq = 0; irq < nr_irqs; irq++)
Index: b/kernel/irq/handle.c
===================================================================
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -203,7 +203,7 @@ out_unlock:
return desc;
}
-#else
+#else /* !CONFIG_SPARSE_IRQ */
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS-1] = {
@@ -218,7 +218,12 @@ struct irq_desc irq_desc[NR_IRQS] __cach
}
};
-#endif
+struct irq_desc *irq_to_desc(unsigned int irq)
+{
+ return (irq < nr_irqs) ? irq_desc + irq : NULL;
+}
+
+#endif /* !CONFIG_SPARSE_IRQ */
/*
* What should we do if we get a hw irq event on an illegal vector?
--
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