Revision 8339f0008c47cdd921c73f6d53d5588b5484f93c authored by Eric W. Biederman on 29 January 2007, 20:19:05 UTC, committed by Linus Torvalds on 30 January 2007, 16:29:58 UTC
When the world was a simple and static place setting up irqs was easy. It sufficed to allocate a linux irq number and a find a free cpu vector we could receive that linux irq on. In those days it was a safe assumption that any allocated vector was actually in use so after one global pass through all of the vectors we would have none left. These days things are much more dynamic with interrupt controllers (in the form of MSI or MSI-X) appearing on plug in cards and linux irqs appearing and disappearing. As these irqs come and go vectors are allocated and freed, invalidating the ancient assumption that all allocated vectors stayed in use forever. So this patch modifies the vector allocator to walk through every possible vector before giving up, and to check to see if a vector is in use before assigning it. With these changes we stop leaking freed vectors and it becomes possible to allocate and free irq vectors all day long. This changed was modeled after the vector allocator on x86_64 where this limitation has already been removed. In essence we don't update the static variables that hold the position of the last vector we allocated until have successfully allocated another vector. This allows us to detect if we have completed one complete scan through all of the possible vectors. Acked-by: Auke Kok <auke-jan.h.kok@intel.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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kdebug.h
#ifndef _IA64_KDEBUG_H
#define _IA64_KDEBUG_H 1
/*
* include/asm-ia64/kdebug.h
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) Intel Corporation, 2005
*
* 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
* <anil.s.keshavamurthy@intel.com> adopted from
* include/asm-x86_64/kdebug.h
*
* 2005-Oct Keith Owens <kaos@sgi.com>. Expand notify_die to cover more
* events.
*/
#include <linux/notifier.h>
struct pt_regs;
struct die_args {
struct pt_regs *regs;
const char *str;
long err;
int trapnr;
int signr;
};
extern int register_die_notifier(struct notifier_block *);
extern int unregister_die_notifier(struct notifier_block *);
extern int register_page_fault_notifier(struct notifier_block *);
extern int unregister_page_fault_notifier(struct notifier_block *);
extern struct atomic_notifier_head ia64die_chain;
enum die_val {
DIE_BREAK = 1,
DIE_FAULT,
DIE_OOPS,
DIE_PAGE_FAULT,
DIE_MACHINE_HALT,
DIE_MACHINE_RESTART,
DIE_MCA_MONARCH_ENTER,
DIE_MCA_MONARCH_PROCESS,
DIE_MCA_MONARCH_LEAVE,
DIE_MCA_SLAVE_ENTER,
DIE_MCA_SLAVE_PROCESS,
DIE_MCA_SLAVE_LEAVE,
DIE_MCA_RENDZVOUS_ENTER,
DIE_MCA_RENDZVOUS_PROCESS,
DIE_MCA_RENDZVOUS_LEAVE,
DIE_MCA_NEW_TIMEOUT,
DIE_INIT_ENTER,
DIE_INIT_MONARCH_ENTER,
DIE_INIT_MONARCH_PROCESS,
DIE_INIT_MONARCH_LEAVE,
DIE_INIT_SLAVE_ENTER,
DIE_INIT_SLAVE_PROCESS,
DIE_INIT_SLAVE_LEAVE,
DIE_KDEBUG_ENTER,
DIE_KDEBUG_LEAVE,
DIE_KDUMP_ENTER,
DIE_KDUMP_LEAVE,
};
static inline int notify_die(enum die_val val, char *str, struct pt_regs *regs,
long err, int trap, int sig)
{
struct die_args args = {
.regs = regs,
.str = str,
.err = err,
.trapnr = trap,
.signr = sig
};
return atomic_notifier_call_chain(&ia64die_chain, val, &args);
}
#endif
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