Chen, Kenneth W a0776ec8e9 [IA64] remove per-cpu ia64_phys_stacked_size_p8 ... It's not efficient to use a per-cpu variable just to store how many physical stack register a cpu has. Ever since the incarnation of ia64 up till upcoming Montecito processor, that variable has "glued" to 96. Having a variable in memory means that the kernel is burning an extra cacheline access on every syscall and kernel exit path. Such "static" value is better served with the instruction patching utility exists today. Convert ia64_phys_stacked_size_p8 into dynamic insn patching. This also has a pleasant side effect of eliminating access to per-cpu area while psr.ic=0 in the kernel exit path. (fixable for per-cpu DTC work, but why bother?) There are some concerns with the default value that the instruc- tion encoded in the kernel image. It shouldn't be concerned. The reasons are: (1) cpu_init() is called at CPU initialization. In there, we find out physical stack register size from PAL and patch two instructions in kernel exit code. The code in question can not be executed before the patching is done. (2) current implementation stores zero in ia64_phys_stacked_size_p8, and that's what the current kernel exit path loads the value with. With the new code, it is equivalent that we store reg size 96 in ia64_phys_stacked_size_p8, thus creating a better safety net. Given (1) above can never fail, having (2) is just a bonus. All in all, this patch allow one less memory reference in the kernel exit path, thus reducing syscall and interrupt return latency; and avoid polluting potential useful data in the CPU cache. Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>		2007-02-06 15:04:18 -08:00
..
sn	[IA64] fix possible XPC deadlock when disconnecting	2006-12-12 11:48:53 -08:00
a.out.h
acpi-ext.h	[IA64] update HP CSR space discovery via ACPI	2006-04-06 14:42:38 -07:00
acpi.h	[IA64] - Fix MAX_PXM_DOMAINS for systems with > 256 nodes	2006-04-20 10:16:11 -07:00
agp.h
asmmacro.h	[IA64] remove per-cpu ia64_phys_stacked_size_p8	2007-02-06 15:04:18 -08:00
atomic.h
auxvec.h
bitops.h	[IA64] remove asm-ia64/bitops.h self-inclusion	2006-05-05 11:37:15 -07:00
break.h	[IA64] enable trap code on slot 1	2006-12-12 12:00:55 -08:00
bug.h
bugs.h
byteorder.h
cache.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
cacheflush.h	[PATCH] Optimize D-cache alias handling on fork	2006-12-13 09:27:08 -08:00
checksum.h	[PATCH] fix prototype of csum_ipv6_magic() (ia64)	2007-01-23 11:09:49 -08:00
compat.h
cpu.h
cputime.h
current.h
cyclone.h
delay.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
device.h	ACPI: Change ACPI to use dev_archdata instead of firmware_data	2006-12-01 14:52:01 -08:00
div64.h
dma-mapping.h	[PATCH] Pass struct dev pointer to dma_cache_sync()	2006-12-07 08:39:41 -08:00
dma.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
dmi.h
elf.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
emergency-restart.h
errno.h
esi.h	[IA64] esi-support	2006-06-21 11:19:22 -07:00
fcntl.h
fpswa.h
fpu.h
futex.h	[PATCH] mm: pagefault_{disable,enable}()	2006-12-07 08:39:21 -08:00
gcc_intrin.h
hardirq.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
hw_irq.h	[PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend()	2006-06-29 10:26:23 -07:00
ia32.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
ia64regs.h
ide.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
intel_intrin.h
intrinsics.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
io.h	Altix: Add initial ACPI IO support	2006-12-01 14:36:57 -08:00
ioctl.h
ioctls.h
iosapic.h
ipcbuf.h
irq.h	[PATCH] genirq ia64 cleanup	2006-07-03 15:26:58 -07:00
irq_regs.h	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
Kbuild	[PATCH] cleanup asm/setup.h userspace visibility	2006-12-07 08:39:46 -08:00
kdebug.h	[PATCH] Notify page fault call chain for ia64	2006-06-26 09:58:22 -07:00
kexec.h	[IA64] IA64 Kexec/kdump	2006-12-07 09:51:35 -08:00
kmap_types.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
kprobes.h	[IA64] enable trap code on slot 1	2006-12-12 12:00:55 -08:00
kregs.h
linkage.h
local.h
machvec.h	[IA64] IA64 Kexec/kdump	2006-12-07 09:51:35 -08:00
machvec_dig.h
machvec_hpsim.h
machvec_hpzx1.h
machvec_hpzx1_swiotlb.h
machvec_init.h
machvec_sn2.h	[IA64] IA64 Kexec/kdump	2006-12-07 09:51:35 -08:00
mc146818rtc.h
mca.h	[IA64] Sanitize assembler code for ia64_sal_os_state	2006-06-21 14:44:26 -07:00
mca_asm.h	[IA64] Make gp value point to Region 5 in mca handler	2006-09-26 14:13:03 -07:00
meminit.h	[IA64] IA64 Kexec/kdump	2006-12-07 09:51:35 -08:00
mman.h	[PATCH] IA64,sparc: local DoS with corrupted ELFs	2006-09-08 08:40:46 -07:00
mmu.h
mmu_context.h
mmzone.h
module.h	[PATCH] Move compiler check for modules to ia64 only	2006-09-26 10:52:37 +02:00
msgbuf.h
mutex.h	[IA64] fix bug in ia64 __mutex_fastpath_trylock	2006-04-07 22:39:49 -07:00
namei.h
nodedata.h	[PATCH] pgdat allocation and update for ia64 of memory hotplug: update pgdat address array	2006-06-27 17:32:37 -07:00
numa.h	[PATCH] fix "cpu to node relationship fixup: map cpu to node"	2006-09-27 08:26:08 -07:00
page.h	[IA64] Fix DISCONTIGMEM without VIRTUAL_MEM_MAP	2006-12-07 11:24:03 -08:00
pal.h	[PATCH] Add support for type argument in PAL_GET_PSTATE	2006-12-07 11:21:55 -08:00
param.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
parport.h
patch.h	[IA64] remove per-cpu ia64_phys_stacked_size_p8	2007-02-06 15:04:18 -08:00
pci.h	ia64: add pci_get_legacy_ide_irq()	2007-01-27 13:46:54 +01:00
percpu.h	[PATCH] lockdep: add per_cpu_offset()	2006-07-03 15:27:00 -07:00
perfmon.h
perfmon_default_smpl.h
pgalloc.h	[PATCH] numa node ids are int, page_to_nid and zone_to_nid should return int	2006-12-07 08:39:23 -08:00
pgtable.h	[PATCH] Standardize pxx_page macros	2006-09-26 08:48:51 -07:00
poll.h
posix_types.h	[PATCH] FD_ZERO build fix	2007-01-11 18:18:22 -08:00
processor.h	[IA64] remove per-cpu ia64_phys_stacked_size_p8	2007-02-06 15:04:18 -08:00
ptrace.h	[PATCH] Add regs_return_value() helper	2006-10-02 07:57:16 -07:00
ptrace_offsets.h
resource.h
rse.h
rwsem.h	[PATCH] lockdep: remove RWSEM_DEBUG remnants	2006-07-03 15:27:01 -07:00
sal.h	[IA64] move SAL_CACHE_FLUSH check later in boot	2006-10-31 14:32:10 -08:00
scatterlist.h	[IA64] Move sg_dma_{len,address} from pci.h to scatterlist.h	2006-12-13 13:15:10 -08:00
sections.h	[IA64] remove per-cpu ia64_phys_stacked_size_p8	2007-02-06 15:04:18 -08:00
segment.h
semaphore.h
sembuf.h
serial.h
setup.h
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h	[PATCH] irq-flags: IA64: Use the new IRQF_ constants	2006-07-02 13:58:47 -07:00
smp.h	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6	2006-09-27 10:53:30 -07:00
socket.h	[AF_UNIX]: Datagram getpeersec	2006-06-29 16:58:06 -07:00
sockios.h
sparsemem.h
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	2006-10-01 00:39:21 -07:00
spinlock_types.h
stat.h
statfs.h
string.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
suspend.h
system.h	[IA64] sparse cleanups	2006-08-02 16:03:44 -07:00
termbits.h	[PATCH] tty: preparatory structures for termios revamp	2006-12-08 08:28:56 -08:00
termios.h
thread_info.h	[PATCH] PM: Fix SMP races in the freezer	2006-12-13 09:05:49 -08:00
timex.h
tlb.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
tlbflush.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
topology.h	[PATCH] sched: add option to serialize load balancing	2006-12-10 09:55:43 -08:00
types.h
uaccess.h	[IA64] don't double >> PAGE_SHIFT pointer for /dev/kmem access	2006-10-26 14:57:06 -07:00
ucontext.h
unaligned.h
uncached.h
unistd.h	[PATCH] rename the provided execve functions to kernel_execve	2006-10-02 07:57:23 -07:00
unwind.h
user.h
ustack.h	[PATCH] Fix 'make headers_check' on ia64	2006-09-16 12:54:32 -07:00
vga.h	[PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use	2006-06-22 15:05:58 -07:00
xor.h