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2008-03-31[POWERPC] sata_fsl: reduce compatibility to fsl,pq-sataKim Phillips
as prescribed in Documentation/powerpc/booting-without-of.txt. Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Acked-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-03-31[POWERPC] 83xx: enable usb in 837x rdb and 83xx defconfigsKim Phillips
Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-03-31[POWERPC] 83xx: Fix wrong USB phy type in mpc837xrdb dtsAnton Vorontsov
Due to chip constraint MPC837x USB DR module can only use ULPI and serial PHY interfaces. The patch fixes the wrong type in dts. This patch fixes USB malfunctioning on the MPC837xE-RDB boards. Similar patch has been already applied for the MDS boards: commit 28b958859206b7010d03129611c2e444898e3ee4 Author: Li Yang <leoli@freescale.com> Date: Thu Mar 6 18:42:26 2008 +0800 [POWERPC] 83xx: Fix wrong USB phy type in mpc837xmds dts Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-03-30powerpc/pseries/xcis: ansifyAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-30vma_map: use proper pointer typesAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-28Avoid false positive warnings in kmap_atomic_prot() with DEBUG_HIGHMEMAndrew Morton
I believe http://bugzilla.kernel.org/show_bug.cgi?id=10318 is a false positive. There's no way in which networking will be using highmem pages here, so it won't be taking the KM_USER0 kmap slot, so there's no point in performing these checks. Cc: Pawel Staszewski <pstaszewski@artcom.pl> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Christoph Lameter <clameter@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> [ Really sad. We lose almost all real-life coverage of the debug tests with this patch. Now it will only report problems for the cases where people actually end up using a HIGHMEM page, not when they just _might_ use one. - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-28Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Fix missed hardware breakpoints across multiple threads
2008-03-28[POWERPC] Fix missed hardware breakpoints across multiple threadsMichael Ellerman
There is a bug in the powerpc DABR (data access breakpoint) handling, which can result in us missing breakpoints if several threads are trying to break on the same address. The circumstances are that do_page_fault() calls do_dabr(), this clears the DABR (sets it to 0) and sets up the signal which will report to userspace that the DABR was hit. The do_signal() code will restore the DABR value on the way out to userspace. If we reschedule before calling do_signal(), __switch_to() will check the cached DABR value and compare it to the new thread's value, if they match we don't set the DABR in hardware. So if two threads have the same DABR value, and we schedule from one to the other after taking the interrupt for the first thread hitting the DABR, the second thread will run without the DABR set in hardware. The cleanest fix is to move the cache update into set_dabr(), that way we can't forget to do it. Reported-by: Jan Kratochvil <jan.kratochvil@redhat.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-03-27Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linusLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: lguest: comment documentation update. lguest: Don't need comment terminator before disk section. lguest: lguest.txt documentation fix lguest: Add puppies which where previously missing. virtio_pci: unregister virtio device at device remove
2008-03-28lguest: comment documentation update.Rusty Russell
Took some cycles to re-read the Lguest Journey end-to-end, fix some rot and tighten some phrases. Only comments change. No new jokes, but a couple of recycled old jokes. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-03-27Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] update pasemi_defconfig
2008-03-27x86: prefetch fix #2Ingo Molnar
Linus noticed a second bug and an uncleanliness: - we'd return on any instruction fetch fault - we'd use both the value of 16 and the PF_INSTR symbol which are the same and make no sense the cleanup nicely unifies this piece of logic. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-27Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: xen: fix UP setup of shared_info xen: fix RMW when unmasking events x86, documentation: nmi_watchdog=2 works on x86_64 x86: stricter check in follow_huge_addr() rdc321x: GPIO routines bugfixes x86: ptrace.c: fix defined-but-unused warnings x86: fix prefetch workaround
2008-03-27Merge branch 'avr32-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6 * 'avr32-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6: avr32: Fix bug in early resource allocation code avr32: Build fix for CONFIG_BUG=n avr32: Work around byteswap bug in gcc < 4.2
2008-03-27xen: fix UP setup of shared_infoJeremy Fitzhardinge
We need to set up the shared_info pointer once we've mapped the real shared_info into its fixmap slot. That needs to happen once the general pagetable setup has been done. Previously, the UP shared_info was set up one in xen_start_kernel, but that was left pointing to the dummy shared info. Unfortunately there's no really good place to do a later setup of the shared_info in UP, so just do it once the pagetable setup has been done. [ Stable: needed in 2.6.24.x ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stable Kernel <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-27xen: fix RMW when unmasking eventsJeremy Fitzhardinge
xen_irq_enable_direct and xen_sysexit were using "andw $0x00ff, XEN_vcpu_info_pending(vcpu)" to unmask events and test for pending ones in one instuction. Unfortunately, the pending flag must be modified with a locked operation since it can be set by another CPU, and the unlocked form of this operation was causing the pending flag to get lost, allowing the processor to return to usermode with pending events and ultimately deadlock. The simple fix would be to make it a locked operation, but that's rather costly and unnecessary. The fix here is to split the mask-clearing and pending-testing into two instructions; the interrupt window between them is of no concern because either way pending or new events will be processed. This should fix lingering bugs in using direct vcpu structure access too. [ Stable: needed in 2.6.24.x ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stable <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-27x86: stricter check in follow_huge_addr()Christoph Lameter
The first page of the compound page is determined in follow_huge_addr() but then PageCompound() only checks if the page is part of a compound page. PageHead() allows checking if this is indeed the first page of the compound. Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-27rdc321x: GPIO routines bugfixesFlorian Fainelli
This patch fixes the use of GPIO routines which are in the PCI configuration space of the RDC321x, therefore reading/writing to this space without spinlock protection can be problematic. We also now request and free GPIOs and support the MGB100 board, previous code was very AR525W-centric. Signed-off-by: Volker Weiss <volker@tintuc.de> Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-27x86: ptrace.c: fix defined-but-unused warningsAndrew Morton
arch/x86/kernel/ptrace.c:548: warning: 'ptrace_bts_get_size' defined but not used arch/x86/kernel/ptrace.c:558: warning: 'ptrace_bts_read_record' defined but not used arch/x86/kernel/ptrace.c:607: warning: 'ptrace_bts_clear' defined but not used arch/x86/kernel/ptrace.c:617: warning: 'ptrace_bts_drain' defined but not used arch/x86/kernel/ptrace.c:720: warning: 'ptrace_bts_config' defined but not used arch/x86/kernel/ptrace.c:788: warning: 'ptrace_bts_status' defined but not used Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-27x86: fix prefetch workaroundIngo Molnar
some early Athlon XP's and Opterons generate bogus faults on prefetch instructions. The workaround for this regressed over .24 - reinstate it. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-27avr32: Fix bug in early resource allocation codeHaavard Skinnemoen
add_reserved_region() tries to keep the resource list sorted, so when looking for a place to insert the new resource, it may break out before the last entry. When this happens, the list is broken in two because the sibling field of the new entry doesn't point to the next resource. Fix it by updating the new resource's sibling field appropriately. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
2008-03-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (43 commits) [IPSEC]: Fix BEET output [ICMP]: Dst entry leak in icmp_send host re-lookup code (v2). [AX25]: Remove obsolete references to BKL from TODO file. [NET]: Fix multicast device ioctl checks [IRDA]: Store irnet_socket termios properly. [UML]: uml-net: don't set IFF_ALLMULTI in set_multicast_list [VLAN]: Don't copy ALLMULTI/PROMISC flags from underlying device netxen, phy/marvell, skge: minor checkpatch fixes S2io: Handle TX completions on the same CPU as the sender for MIS-X interrupts b44: Truncate PHY address skge napi->poll() locking bug rndis_host: fix oops when query for OID_GEN_PHYSICAL_MEDIUM fails cxgb3: Fix lockdep problems with sge.reg_lock ehea: Fix IPv6 support dm9000: Support promisc and all-multi modes dm9601: configure MAC to drop invalid (crc/length) packets dm9601: add Hirose USB-100 device ID Marvell PHY m88e1111 driver fix netxen: fix rx dropped stats netxen: remove low level tx lock ...
2008-03-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC64]: Define TASK_SIZE_OF() [SPARC64]: flush_ptrace_access() needs preemption disable. [SPARC64]: Update defconfig. [SPARC64]: Fix allnoconfig build, ptrace.c missing CONFIG_COMPAT checks. [SPARC64]: Fix __get_cpu_var in preemption-enabled area. [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/signal.c [SPARC64]: Fix most sparse warnings in arch/sparc64/kernel/sys_sparc.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/time.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/ptrace.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/irq.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/iommu.c [SPARC64]: Fix sparse errors in arch/sparc64/kernel/traps.c [SPARC64]: Fix sparse warnings in arch/sparc64/kernel/{cpu,setup}.c [SPARC64]: Adjust {TLBTEMP,TSBMAP}_BASE. [SPARC64]: Make save_stack_trace() more efficient.
2008-03-26x86: fix performance drop for glxSuresh Siddha
fix the 3D performance drop reported at: http://bugzilla.kernel.org/show_bug.cgi?id=10328 fb drivers are using ioremap()/ioremap_nocache(), followed by mtrr_add with WC attribute. Recent changes in page attribute code made both ioremap()/ioremap_nocache() mappings as UC (instead of previous UC-). This breaks the graphics performance, as the effective memory type is UC instead of expected WC. The correct way to fix this is to add ioremap_wc() (which uses UC- in the absence of PAT kernel support and WC with PAT) and change all the fb drivers to use this new ioremap_wc() API. We can take this correct and longer route for post 2.6.25. For now, revert back to the UC- behavior for ioremap/ioremap_nocache. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-26x86: fix trim mtrr not to setup_memory two timesYinghai Lu
we could call find_max_pfn() directly instead of setup_memory() to get max_pfn needed for mtrr trimming. otherwise setup_memory() is called two times... that is duplicated... [ mingo@elte.hu: both Thomas and me simulated a double call to setup_bootmem_allocator() and can confirm that it is a real bug which can hang in certain configs. It's not been reported yet but that is probably due to the relatively scarce nature of MTRR-trimming systems. ] Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-26x86: GEODE: add missing module.h includeAndres Salomon
On Wed, 26 Mar 2008 11:56:22 -0600 Jordan Crouse <jordan.crouse@amd.com> wrote: > On 26/03/08 14:31 +0100, Stefan Pfetzing wrote: > > Hello Jordan, > > > > I just tried to build your geodwdt driver for the geode watchdog. Therefore > > I pulled your repository from http://git.infradead.org/geode.git (or more, > > the git url). > > > > I tried to build the geodewdt driver as a module - which didn't work, and > > it failed with the same problem as earlier mentioned on lkmk [1]. I also > > checked the fix [2], but that seems to be already in your (or linus) tree - > > and so I'm unsure what the problem is. > > > > [1] http://kerneltrap.org/mailarchive/linux-kernel/2008/2/17/884074 > > [2] http://kerneltrap.org/mailarchive/linux-kernel/2008/2/17/884174 > > > > Building directly into the kernel seems to work. > > > > Maybe you have some idea? > > Hmm - that is strange. Exporting the symbols should work. I recommend > starting over with a clean tree. > > CCing Andres - any thoughts? > > Jordan > Er, yeah. The patch below should fix it. This should probably go into 2.6.25. Oops, EXPORT_SYMBOL_GPL wasn't being declared due to this header being missing. Signed-off-by: Andres Salomon <dilinger@debian.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-26x86, cpufreq: fix Speedfreq-SMI call that clobbers ECXStephan Diestelhorst
I have found that using SMI to change the cpu's frequency on my DELL Latitude L400 clobbers the ECX register in speedstep_set_state, causing unneccessary retries because the "state" variable has changed silently (GCC assumes it is still present in ECX). play safe and avoid gcc caching any register across IO port accesses that trigger SMIs. Signed-off by: <Stephan.Diestelhorst@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-26x86: fix memoryless node oops during bootYinghai Lu
fix oops during boot reported in this thread: http://lkml.org/lkml/2008/2/6/65 enable booting on memoryless nodes. Reported-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-26x86: add dmi quirk for io_delayIngo Molnar
reported by mereandor@gmail.com, in: http://bugzilla.kernel.org/show_bug.cgi?id=6307 Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-26x86: convert mtrr/generic.c to kernel-docRandy Dunlap
Convert function comment blocks to kernel-doc notation. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-26[SPARC64]: flush_ptrace_access() needs preemption disable.David S. Miller
Based upon a report by Mariusz Kozlowski. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Update defconfig.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix allnoconfig build, ptrace.c missing CONFIG_COMPAT checks.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix __get_cpu_var in preemption-enabled area.David S. Miller
Reported by Mariusz Kozlowski. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix sparse warnings in arch/sparc64/kernel/signal.cDavid S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix most sparse warnings in arch/sparc64/kernel/sys_sparc.cDavid S. Miller
Sparse still doesn't like the funny cast we make from a scalar to a "union semun" (which is correct by the C language and in particular works with the sparc64 calling conventions, but sparse doesn't grok that yet). Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix sparse warnings in arch/sparc64/kernel/time.cDavid S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix sparse warnings in arch/sparc64/kernel/ptrace.cDavid S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix sparse warnings in arch/sparc64/kernel/irq.cDavid S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix sparse warnings in arch/sparc64/kernel/iommu.cDavid S. Miller
Fix local variable shadowing in dma_4u_map_sg(). Mark sun4u_dma_ops static. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[SPARC64]: Fix sparse errors in arch/sparc64/kernel/traps.cDavid S. Miller
Add 'UL' markers to DCU_* macros. Declare C functions called from assembler in entry.h Declare C functions called from within the sparc64 arch code in include/asm-sparc64/*.h headers as appropriate. Remove unused routines in traps.c Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-26[UML]: uml-net: don't set IFF_ALLMULTI in set_multicast_listPatrick McHardy
IFF_ALLMULTI is an indication from the network stack to the driver to disable multicast filters, drivers should never set it directly. Since the UML networking device doesn't have any filtering capabilites, it doesn't the set_multicast_list function at all, it is kept so userspace can still issue SIOCADDMULTI/SIOCDELMULTI ioctls however. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-25[SPARC64]: Fix sparse warnings in arch/sparc64/kernel/{cpu,setup}.cDavid S. Miller
We create a local header file entry.h, under arch/sparc64/kernel/, that we can use to declare routines either defined in assembler or only invoked from assembler. As well as other data objects which are private to the inner sparc64 kernel arch code. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-25[POWERPC] update pasemi_defconfigOlof Johansson
Disable GEN_RTC since it conflicts with the i2c rtc drivers registering, besides that keep most of the new defaults. Signed-off-by: Olof Johansson <olof@lixom.net>
2008-03-25KVM: MMU: Fix memory leak on guest demand faultsAvi Kivity
While backporting 72dc67a69690288538142df73a7e3ac66fea68dc, a gfn_to_page() call was duplicated instead of moved (due to an unrelated patch not being present in mainline). This caused a page reference leak, resulting in a fairly massive memory leak. Fix by removing the extraneous gfn_to_page() call. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-25KVM: VMX: convert init_rmode_tss() to slots_lockMarcelo Tosatti
init_rmode_tss was forgotten during the conversion from mmap_sem to slots_lock. INFO: task qemu-system-x86:3748 blocked for more than 120 seconds. Call Trace: [<ffffffff8053d100>] __down_read+0x86/0x9e [<ffffffff8053fb43>] do_page_fault+0x346/0x78e [<ffffffff8053d235>] trace_hardirqs_on_thunk+0x35/0x3a [<ffffffff8053dcad>] error_exit+0x0/0xa9 [<ffffffff8035a7a7>] copy_user_generic_string+0x17/0x40 [<ffffffff88099a8a>] :kvm:kvm_write_guest_page+0x3e/0x5f [<ffffffff880b661a>] :kvm_intel:init_rmode_tss+0xa7/0xf9 [<ffffffff880b7d7e>] :kvm_intel:vmx_vcpu_reset+0x10/0x38a [<ffffffff8809b9a5>] :kvm:kvm_arch_vcpu_setup+0x20/0x53 [<ffffffff8809a1e4>] :kvm:kvm_vm_ioctl+0xad/0x1cf [<ffffffff80249dea>] __lock_acquire+0x4f7/0xc28 [<ffffffff8028fad9>] vfs_ioctl+0x21/0x6b [<ffffffff8028fd75>] do_vfs_ioctl+0x252/0x26b [<ffffffff8028fdca>] sys_ioctl+0x3c/0x5e [<ffffffff8020b01b>] system_call_after_swapgs+0x7b/0x80 Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-25KVM: MMU: handle page removal with shadow mappingMarcelo Tosatti
Do not assume that a shadow mapping will always point to the same host frame number. Fixes crash with madvise(MADV_DONTNEED). [avi: move after first printk(), add another printk()] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-25KVM: MMU: Fix is_rmap_pte() with io ptesAvi Kivity
is_rmap_pte() doesn't take into account io ptes, which have the avail bit set. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-25KVM: VMX: Restore tss even on x86_64Avi Kivity
The vmx hardware state restore restores the tss selector and base address, but not its length. Usually, this does not matter since most of the tss contents is within the default length of 0x67. However, if a process is using ioperm() to grant itself I/O port permissions, an additional bitmap within the tss, but outside the default length is consulted. The effect is that the process will receive a SIGSEGV instead of transparently accessing the port. Fix by restoring the tss length. Note that i386 had this working already. Closes bugzilla 10246. Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-03-24[SPARC64]: Make save_stack_trace() more efficient.David S. Miller
Doing a 'flushw' every stack trace capture creates so much overhead that it makes lockdep next to unusable. We only care about the frame pointer chain and the function caller program counters, so flush those by hand to the stack frame. This is significantly more efficient than a 'flushw' because: 1) We only save 16 bytes per active register window to the stack. 2) This doesn't push the entire register window context of the current call chain out of the cpu, forcing register window fill traps as we return back down. Note that we can't use 'restore' and 'save' instructions to move around the register windows because that wouldn't work on Niagara processors. They optimize 'save' into a new register window by simply clearing out the registers instead of pulling them in from the on-chip register window backing store. Based upon a report by Tom Callaway. Signed-off-by: David S. Miller <davem@davemloft.net>
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