linux-kernel - [PATCH v3] asm-generic: drop HARDIRQ

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Date:	Tue, 16 Jun 2009 16:37:06 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mike Frysinger <vapier.adi@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Steven Rostedt <srostedt@...hat.com>
Subject: [PATCH v3] asm-generic: drop HARDIRQ_BITS definition from hardirq.h

Architechtures normally don't need to set a HARDIRQ_BITS
unless they have hardcoded a specific value in assembly.
This drops the definition from asm-generic/hardirq.h, which
results in linux/hardirq.h setting its default of 10.

Both the old default of 8 and the linux/hardirq.h default
of 10 are sufficient because they only limit the number
of nested hardirqs, and we normally run out of stack space
much earlier than exceeding 256 or even 1024 nested interrupts.

Reported-by: Mike Frysinger <vapier@...too.org>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/asm-generic/hardirq.h |   13 -------------
 1 files changed, 0 insertions(+), 13 deletions(-)

---

v3: Updated the description.
v2: removed HARDIRQ_BITS definition
v1: original patch from Mike

diff --git a/include/asm-generic/hardirq.h b/include/asm-generic/hardirq.h
index 3d5d2c9..23bb4da 100644
--- a/include/asm-generic/hardirq.h
+++ b/include/asm-generic/hardirq.h
@@ -11,19 +11,6 @@ typedef struct {
 
 #include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
 
-#ifndef HARDIRQ_BITS
-#define HARDIRQ_BITS	8
-#endif
-
-/*
- * The hardirq mask has to be large enough to have
- * space for potentially all IRQ sources in the system
- * nesting on a single CPU:
- */
-#if (1 << HARDIRQ_BITS) < NR_IRQS
-# error HARDIRQ_BITS is too low!
-#endif
-
 #ifndef ack_bad_irq
 static inline void ack_bad_irq(unsigned int irq)
 {
-- 
1.6.3.1

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