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hawkes@sgi.com defbb2c929 [IA64] ia64: simplify and fix udelay() 
The original ia64 udelay() was simple, but flawed for platforms without
synchronized ITCs:  a preemption and migration to another CPU during the
while-loop likely resulted in too-early termination or very, very
lengthy looping.

The first fix (now in 2.6.15) broke the delay loop into smaller,
non-preemptible chunks, reenabling preemption between the chunks.  This
fix is flawed in that the total udelay is computed to be the sum of just
the non-premptible while-loop pieces, i.e., not counting the time spent
in the interim preemptible periods.  If an interrupt or a migration
occurs during one of these interim periods, then that time is invisible
and only serves to lengthen the effective udelay().

This new fix backs out the current flawed fix and returns to a simple
udelay(), fully preemptible and interruptible.  It implements two simple
alternative udelay() routines:  one a default generic version that uses
ia64_get_itc(), and the other an sn-specific version that uses that
platform's RTC.

Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2006-02-15 13:37:04 -08:00
..
sn [IA64-SGI] enforce proper ordering of callouts by XPC 2006-02-15 13:35:03 -08:00
a.out.h
acpi-ext.h [ACPI] fix IA64 build warning 2005-08-04 22:29:34 -04:00
acpi.h [IA64] Add ACPI based P-state support 2005-08-26 15:09:24 -07:00
agp.h
asmmacro.h
atomic.h [PATCH] mutex subsystem, add atomic_xchg() to all arches 2006-01-09 15:59:17 -08:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
bitops.h [FLS64]: generic version 2006-01-03 13:11:06 -08:00
break.h [PATCH] Kprobes/IA64: kdebug die notification mechanism 2005-06-23 09:45:22 -07:00
bug.h [PATCH] remove gcc-2 checks 2006-01-08 20:14:02 -08:00
bugs.h
byteorder.h
cache.h [PATCH] Kill L1_CACHE_SHIFT_MAX 2006-01-08 20:13:39 -08:00
cacheflush.h
checksum.h
compat.h [PATCH] ia64: task_pt_regs() 2006-01-12 09:08:58 -08:00
cpu.h
cputime.h
current.h
cyclone.h
delay.h [IA64] disable preemption in udelay() 2005-12-16 10:00:24 -08:00
div64.h
dma-mapping.h [PATCH] ia64: re-implement dma_get_cache_alignment to avoid EXPORT_SYMBOL 2005-11-07 07:53:23 -08:00
dma.h
elf.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno.h
fcntl.h [PATCH] Clean up struct flock definitions 2005-09-07 16:57:38 -07:00
fpswa.h
fpu.h
futex.h [PATCH] consolidate asm/futex.h 2006-01-08 20:13:39 -08:00
gcc_intrin.h
hardirq.h
hw_irq.h [PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity 2005-09-07 16:57:15 -07:00
ia32.h [IA64] Change SET_PERSONALITY to comply with comment in binfmt_elf.c. 2005-12-06 09:12:34 -08:00
ia64regs.h
ide.h [PATCH] ia64: drop arch-specific IDE MAX_HWIFS definition 2006-02-03 08:32:11 -08:00
intel_intrin.h
intrinsics.h
io.h [PATCH] /dev/mem: validate mmap requests 2006-01-08 20:14:02 -08:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h
iosapic.h [IA64] Minor cleanups - remove unnecessary function prototype in iosapic.h 2005-09-07 14:00:40 -07:00
ipcbuf.h
irq.h [IA64] Manual merge fix for 3 files 2005-09-08 14:27:13 -07:00
kdebug.h [IA64] Extend notify_die() hooks for IA64 2005-11-07 11:27:13 -08:00
kmap_types.h
kprobes.h [IA64] prevent accidental modification of args in jprobe handler 2006-01-13 14:45:21 -08:00
kregs.h
linkage.h
local.h [IA64] Fix missing parameter for local_add/sub 2005-12-07 11:30:11 -08:00
machvec.h Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2005-10-28 21:09:26 -07:00
machvec_dig.h
machvec_hpsim.h
machvec_hpzx1.h [IA64] more robust zx1/sx1000 machvec support 2005-09-14 16:22:11 -07:00
machvec_hpzx1_swiotlb.h [IA64] more robust zx1/sx1000 machvec support 2005-09-14 16:22:11 -07:00
machvec_init.h
machvec_sn2.h [IA64] remove obsolete corporate address 2006-02-15 13:25:37 -08:00
mc146818rtc.h
mca.h [IA64] Wire in the MCA/INIT handler stacks 2005-09-22 13:24:19 -07:00
mca_asm.h [PATCH] MCA/INIT: use per cpu stacks 2005-09-11 14:08:41 -07:00
meminit.h Pull sparsemem-v5 into release branch 2005-10-28 14:32:56 -07:00
mman.h [PATCH] madvise MADV_DONTFORK/MADV_DOFORK 2006-02-14 16:09:34 -08:00
mmu.h [IA64] Fix race in mm-context wrap-around logic. 2005-08-12 15:05:21 -07:00
mmu_context.h [IA64] make mmu_context.h and tlb.c 80-column friendly 2005-11-03 14:43:50 -08:00
mmzone.h [PATCH] V5 ia64 SPARSEMEM - conditional changes for SPARSEMEM 2005-10-04 13:21:13 -07:00
module.h
msgbuf.h
msi.h [PATCH] PCI: Change MSI to use physical delivery mode always 2005-11-10 16:09:18 -08:00
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h
nodedata.h [PATCH] V5 ia64 SPARSEMEM - conditional changes for SPARSEMEM 2005-10-04 13:21:13 -07:00
numa.h
numnodes.h
page.h [IA64] - Make pfn_valid more precise for SGI Altix systems 2005-11-29 09:24:10 -08:00
pal.h [IA64] pal cache flush patch 2006-01-16 15:44:53 -08:00
param.h [PATCH] ia64: Selectable Timer Interrupt Frequency 2005-06-23 09:45:10 -07:00
parport.h
patch.h
pci.h [PATCH] Make sparc64 use setup-res.c 2005-09-08 14:57:25 -07:00
percpu.h [PATCH] adjust per_cpu definition in non-SMP case 2005-06-23 09:45:28 -07:00
perfmon.h
perfmon_default_smpl.h
pgalloc.h [IA64] 4-level page tables 2005-11-11 09:37:29 -08:00
pgtable.h [IA64] 4-level page tables 2005-11-11 09:37:29 -08:00
poll.h
posix_types.h
processor.h [IA64] avoid broken SAL_CACHE_FLUSH implementations 2006-02-02 13:25:54 -08:00
ptrace.h [PATCH] ia64: task_pt_regs() 2006-01-12 09:08:58 -08:00
ptrace_offsets.h
resource.h
rse.h
rwsem.h [PATCH] add sem_is_read/write_locked() 2005-10-29 21:40:35 -07:00
sal.h [IA64] avoid broken SAL_CACHE_FLUSH implementations 2006-02-02 13:25:54 -08:00
scatterlist.h
sections.h [PATCH] kprobes/ia64: refuse kprobe on ivt code 2005-06-27 15:23:54 -07:00
segment.h
semaphore.h [IA64] Fix bug in ia64 specific down() function 2006-01-17 14:04:00 -08:00
sembuf.h
serial.h
setup.h
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h
smp.h [PATCH] smp_processor_id() cleanup 2005-06-21 18:46:13 -07:00
socket.h [NET]: Introduce SO_{SND,RCV}BUFFORCE socket options 2005-08-29 15:31:35 -07:00
sockios.h
sparsemem.h [PATCH] V5 ia64 SPARSEMEM - conditional changes for SPARSEMEM 2005-10-04 13:21:13 -07:00
spinlock.h [PATCH] remove gcc-2 checks 2006-01-08 20:14:02 -08:00
spinlock_types.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
stat.h
statfs.h
string.h
suspend.h
system.h [IA64] remove staled comments in asm/system.h 2006-02-02 13:20:42 -08:00
termbits.h
termios.h
thread_info.h [IA64] Handle debug traps in fsys mode 2006-01-13 14:16:08 -08:00
timex.h [IA64] ia64: simplify and fix udelay() 2006-02-15 13:37:04 -08:00
tlb.h [PATCH] mm: tlb_finish_mmu forget rss 2005-10-29 21:40:37 -07:00
tlbflush.h [IA64] Use bitmaps for efficient context allocation/free 2005-10-31 14:36:05 -08:00
topology.h [PATCH] Export cpu topology in sysfs 2006-02-03 08:32:09 -08:00
types.h [PATCH] sab: consolidate kmem_bufctl_t 2005-09-05 00:05:48 -07:00
uaccess.h [PATCH] ia64 basic __user annotations 2005-09-29 08:46:27 -07:00
ucontext.h
unaligned.h
uncached.h [PATCH] ia64 uncached alloc 2005-06-21 18:46:18 -07:00
unistd.h [IA64] unshare system call registration for ia64 2006-02-08 15:43:38 -08:00
unwind.h [IA64] MCA/INIT: remove obsolete unwind code 2005-09-11 14:09:34 -07:00
user.h
ustack.h
vga.h [IA64-SGI] pcdp: add PCDP pci interface support 2005-06-28 09:09:06 -07:00
xor.h