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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sigcontext.h
#ifndef _ASM_X86_64_SIGCONTEXT_H
#define _ASM_X86_64_SIGCONTEXT_H
#include <asm/types.h>
#include <linux/compiler.h>
/* FXSAVE frame */
/* Note: reserved1/2 may someday contain valuable data. Always save/restore
them when you change signal frames. */
struct _fpstate {
__u16 cwd;
__u16 swd;
__u16 twd; /* Note this is not the same as the 32bit/x87/FSAVE twd */
__u16 fop;
__u64 rip;
__u64 rdp;
__u32 mxcsr;
__u32 mxcsr_mask;
__u32 st_space[32]; /* 8*16 bytes for each FP-reg */
__u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg */
__u32 reserved2[24];
};
struct sigcontext {
unsigned long r8;
unsigned long r9;
unsigned long r10;
unsigned long r11;
unsigned long r12;
unsigned long r13;
unsigned long r14;
unsigned long r15;
unsigned long rdi;
unsigned long rsi;
unsigned long rbp;
unsigned long rbx;
unsigned long rdx;
unsigned long rax;
unsigned long rcx;
unsigned long rsp;
unsigned long rip;
unsigned long eflags; /* RFLAGS */
unsigned short cs;
unsigned short gs;
unsigned short fs;
unsigned short __pad0;
unsigned long err;
unsigned long trapno;
unsigned long oldmask;
unsigned long cr2;
struct _fpstate __user *fpstate; /* zero when no FPU context */
unsigned long reserved1[8];
};
#endif
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