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2009-09-11Merge branch 'kmemleak' of git://linux-arm.org/linux-2.6Linus Torvalds
* 'kmemleak' of git://linux-arm.org/linux-2.6: kmemleak: Improve the "Early log buffer exceeded" error message kmemleak: fix sparse warning for static declarations kmemleak: fix sparse warning over overshadowed flags kmemleak: move common painting code together kmemleak: add clear command support kmemleak: use bool for true/false questions kmemleak: Do no create the clean-up thread during kmemleak_disable() kmemleak: Scan all thread stacks kmemleak: Don't scan uninitialized memory when kmemcheck is enabled kmemleak: Ignore the aperture memory hole on x86_64 kmemleak: Printing of the objects hex dump kmemleak: Do not report alloc_bootmem blocks as leaks kmemleak: Save the stack trace for early allocations kmemleak: Mark the early log buffer as __initdata kmemleak: Dump object information on request kmemleak: Allow rescheduling during an object scanning
2009-09-11[S390] Wire up page fault events for software perf counters.Heiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] Remove smp_cpu_not_running.Heiko Carstens
smp_cpu_not_running() and cpu_stopped() are doing the same. Remove one and also get rid of the last hard_smp_processor_id() leftover. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] Get rid of cpuid.h header file.Heiko Carstens
Merge cpuid.h header file into cpu.h. While at it convert from typedef to struct declaration and also convert cio code to use proper lowcore structure instead of casts. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] Limit cpu detection to 256 physical cpus.Heiko Carstens
Saves us more than 65k pointless IPIs. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] Enable guest page hinting by default.Heiko Carstens
Get rid of the PAGE_STATES config option and enable guest page hinting by default. It can be disabled by specifying "cmma=off" at the command line. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] use generic scatterlist.hHeiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] s390dbf: Add description for usage of "%s" in sprintf eventsMichael Holzheu
Using "%s" in sprintf event functions is dangerous. This patch adds a short description for this issue to the s390 debug feature documentation. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] Initialize __LC_THREAD_INFO early.Heiko Carstens
"lockdep: Fix backtraces" reveales a bug in early setup code: when lockdep tries to save a stack backtrace before setup_arch has been called the lowcore pointer for the current thread info pointer isn't initialized yet. However our save stack backtrace code relies on it. If the pointer isn't initialized the saved backtrace will have zero entries. lockdep however relies (correctly) on the fact that that cannot happen. A write access to some random memory region is the result. Fix this by initializing the thread info pointer early. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] fix recursive locking on page_table_lockMartin Schwidefsky
Suzuki Poulose reported the following recursive locking bug on s390: Here is the stack trace : (see Appendix I for more info) [<0000000000406ed6>] _spin_lock+0x52/0x94 [<0000000000103bde>] crst_table_free+0x14e/0x1a4 [<00000000001ba684>] __pmd_alloc+0x114/0x1ec [<00000000001be8d0>] handle_mm_fault+0x2cc/0xb80 [<0000000000407d62>] do_dat_exception+0x2b6/0x3a0 [<0000000000114f8c>] sysc_return+0x0/0x8 [<00000200001642b2>] 0x200001642b2 The page_table_lock is already acquired in __pmd_alloc (mm/memory.c) and it tries to populate the pud/pgd with a new pmd allocated. If another thread populates it before we get a chance, we free the pmd using pmd_free(). On s390x, pmd_free(even pud_free ) is #defined to crst_table_free(), which acquires the page_table_lock to protect the crst_table index updates. Hence this ends up in a recursive locking of the page_table_lock. The solution suggested by Dave Hansen is to use a new spin lock in the mmu context to protect the access to the crst_list and the pgtable_list. Reported-by: Suzuki Poulose <suzuki@in.ibm.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] kvm: use console_initcall() to initialize s390 virtio consoleHendrik Brueckner
Use a console_initcall() to initialize the s390 virtio console and clean up s390 console initialization in setup.c. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] hypfs: Use "%u" instead of "%d" for unsigned ints in snprintfMichael Holzheu
For printing unsigned integers hypfs uses "%d" in snprintf(). This is wrong. With this patch "%u" is used instead. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] kernel: Print an error message if kernel NSS cannot be definedHendrik Brueckner
If a named saved system (NSS) cannot be defined or saved, print out an error message with the return code of the underlying z/VM CP command. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] hypfs: remove useless variable qnameVitaliy Gusev
Local variable 'qname' in the function hypfs_create_file() really is not used for any purpose. Signed-off-by: Vitaliy Gusev <vgusev@openvz.org> Cc: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] remove unused irq_cpustat_t defintionChristoph Hellwig
No need to defined a irq_cpustat_t type if __ARCH_IRQ_STAT is defined. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] kernel: always keep machine flags in lowcoreHeiko Carstens
Eleminate the local variable machine_flags and always change machine flags directly in the lowcore. This avoids confusion about when and why the two variables have to be synchronized. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] clean up linker script using new linker script macros.Nelson Elhage
Note that this patch moves .data.init_task inside _edata. In addition, the alignment of .init.ramfs changes: It is now PAGE_ALIGNED and __initramfs_end is arbitrarily aligned; Previously it was only aligned to a 0x100-byte boundary, and always ended on an even byte. This change results in fewer output sections and in some data being reordered, but should have no functional effect. Signed-off-by: Nelson Elhage <nelhage@ksplice.com> Signed-off-by: Tim Abbott <tabbott@ksplice.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-s390@vger.kernel.org Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] Use macros for .data.page_aligned.Tim Abbott
.data.page_aligned should not need a separate output section, so as part of this cleanup I moved into the .data output section in the linker scripts in order to eliminate unnecessary references to the section name. Remove the reference to .data.idt, since nothing is put into the .data.idt section on the s390 architecture. It looks like Cyrill Gorcunov posted a patch to remove the .data.idt code on s390 previously: <http://lkml.indiana.edu/hypermail/linux/kernel/0802.2/2536.html> CCing him and the people who acked that patch in case there's a reason it wasn't applied. Signed-off-by: Tim Abbott <tabbott@ksplice.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] move (io|sysc)_restore_trace_psw into .data sectionHendrik Brueckner
The sysc_restore_trace_psw and io_restore_trace_psw storage locations are created in the .text section. When creating and IPLing from a named saved system (NSS), writing to these locations causes a protection exception (because the .text section is mapped as shared read-only in the NSS). To permit write access, move the storage locations into the .data section. The problem occurs only when CONFIG_TRACE_IRQFLAGS is set. The git commmit that has introduced these variables is: 411788ea7fca01ee803af8225ac35807b4d02050 Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] kernel: Convert upper case scpdata to lower caseHendrik Brueckner
If the CP SET LOADDEV on the 3215 console has been used to specify SCPdata, all data is converted to upper case letters. When scpdata contains upper case letters only, convert all letters to lower case. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] kernel: Append scpdata to kernel boot command lineHendrik Brueckner
Append scpdata to the kernel boot command line. If scpdata starts with the equal sign (=), the kernel boot command line is replaced. (For consistency with zIPL and IPL PARM parameters.) To use scpdata for the kernel boot command line, scpdata must consist of ascii characters only. If scpdata contains other characters, scpdata is not appended to the kernel boot command line. In addition, re-IPL is extended for setting scpdata for the next Linux reboot. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] hibernation: merge files and move to kernel/Heiko Carstens
Merge the nearly empty C files and move everything from power/ to kernel/. That way the files are easier to handle. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] hibernation: remove dead fileHeiko Carstens
There is no caller of do_after_copyback() anywhere. Remove it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] atomic ops: small cleanupsHeiko Carstens
Couple of coding style fixes, replace __inline__ with inline and remove #ifdef __KERNEL_- since the header file isn't exported. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] atomic ops: add effecient atomic64 support for 31 bitHeiko Carstens
Use compare double and swap to implement efficient atomic64 ops for 31 bit. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] improve mcount codeMartin Schwidefsky
Move the 64 bit mount code from mcount.S into mcount64.S and avoid code duplication. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] convert/optimize csum_fold() to CHeiko Carstens
In the meantime gcc generates better code than the old inline assemblies do. Original inline assembly results in: lr %r1,%r2 sr %r3,%r3 lr %r2,%r1 srdl %r2,16 alr %r2,%r3 alr %r1,%r2 srl %r1,16 xilf %r1,65535 llghr %r2,%r1 br %r14 Out of the C code gcc generates this: rll %r1,%r2,16 ar %r1,%r2 srl %r1,16 xilf %r1,65535 llghr %r2,%r1 br %r14 In addition we don't have any static register allocations anymore and gcc is free to shuffle instructions around for better pipeline usage. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] introduce get_clock_monotonicHeiko Carstens
Introduce get_clock_monotonic() function which can be used to get a (fast) timestamp. Resolution is the same as for get_clock(). The only difference is that the timestamps are monotonic and don't jump backward or forward. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11[S390] cio: move scsw helper functions to header fileHeiko Carstens
All scsw helper functions are very short and usage of them shouldn't result in function calls. Therefore we move them to a separate header file. Also saves a lot of EXPORT_SYMBOLs. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-11powerpc/nvram: Enable use Generic NVRAM driver for different size chipsMartyn Welch
Remove the reliance on a staticly defined NVRAM size, allowing platforms to support NVRAMs with sizes differing from the standard. A fall back value is provided for platforms not supporting this extension. Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-11powerpc/iseries: Fix oops reading from /proc/iSeries/mf/*/cmdlineBenjamin Herrenschmidt
That code uses dma_mapping_error() with a NULL device, which is a bad idea :-) The proper fix might be to start using some kind of pseudo device for all these low level mappings with the hypervisor but that will be for another day. Since it directly calls into the low level iommu code, I see no problem in having it directly test against DMA_ERROR_CODE instead of using the accessors with a NULL argument for now. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-10Input: pxa27x_keypad - allow modifying keymap from userspaceDmitry Torokhov
Tested-by: Mike Rapoport <mike@compulab.co.il> Acked-by: Eric Miao <eric.y.miao@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-09-11powerpc/booke: Don't set DABR on 64-bit BookE, use DAC1 insteadBenjamin Herrenschmidt
Also remove a duplicate setting of it in the context switch path on BookE. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-11powerpc/perf_counters: Reduce stack usage of power_check_constraintsPaul Mackerras
Michael Ellerman reported stack-frame size warnings being produced for power_check_constraints(), which uses an 8*8 array of u64 and two 8*8 arrays of unsigned long, which are currently allocated on the stack, along with some other smaller variables. These arrays come to 1.5kB on 64-bit or 1kB on 32-bit, which is a bit too much for the stack. This fixes the problem by putting these arrays in the existing per-cpu cpu_hw_counters struct. This is OK because two of the call sites have interrupts disabled already; for the third call site we use get_cpu_var, which disables preemption, so we know we won't get a context switch while we're in power_check_constraints(). Note that power_check_constraints() can be called during context switch but is not called from interrupts. Reported-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org> Cc: <stable@kernel.org) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-11powerpc: Fix bug where perf_counters breaks oprofilePaul Mackerras
Currently there is a bug where if you use oprofile on a pSeries machine, then use perf_counters, then use oprofile again, oprofile will not work correctly; it will lose the PMU configuration the next time the hypervisor does a partition context switch, and thereafter won't count anything. Maynard Johnson identified the sequence causing the problem: - oprofile setup calls ppc_enable_pmcs(), which calls pseries_lpar_enable_pmcs, which tells the hypervisor that we want to use the PMU, and sets the "PMU in use" flag in the lppaca. This flag tells the hypervisor whether it needs to save and restore the PMU config. - The perf_counter code sets and clears the "PMU in use" flag directly as it context-switches the PMU between tasks, and leaves it clear when it finishes. - oprofile setup, called for a new oprofile run, calls ppc_enable_pmcs, which does nothing because it has already been called. In particular it doesn't set the "PMU in use" flag. This fixes the problem by arranging for ppc_enable_pmcs to always set the "PMU in use" flag. It makes the perf_counter code call ppc_enable_pmcs also rather than calling the lower-level function directly, and removes the setting of the "PMU in use" flag from pseries_lpar_enable_pmcs, since that is now done in its caller. This also removes the declaration of pasemi_enable_pmcs because it isn't defined anywhere. Reported-by: Maynard Johnson <mpjohn@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> Cc: <stable@kernel.org) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-11powerpc/85xx: Fix SMP compile error and allow NULL for smp_opsKumar Gala
The following commit introduced a compile error since it removed the implementation of smp_85xx_basic_setup: commit 77c0a700c1c292edafa11c1e52821ce4636f81b0 Author: Benjamin Herrenschmidt <benh@kernel.crashing.org> Date: Fri Aug 28 14:25:04 2009 +1000 powerpc: Properly start decrementer on BookE secondary CPUs Make it so that smp_ops probe() and setup_cpu() can be set to NULL. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-11powerpc/irq: Improve nanodocWolfram Sang
The OF helpers look like nanodoc but are missing the header. Fix this and a typo (s/nad/and/) while we are here. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-10x86: Fix code patching for paravirt-alternatives on 486Ben Hutchings
As reported in <http://bugs.debian.org/511703> and <http://bugs.debian.org/515982>, kernels with paravirt-alternatives enabled crash in text_poke_early() on at least some 486-class processors. The problem is that text_poke_early() itself uses inline functions affected by paravirt-alternatives and so will modify instructions that have already been prefetched. Pentium and later processors will invalidate the prefetched instructions in this case, but 486-class processors do not. Change sync_core() to limit prefetching on 486-class (and 386-class) processors, and move the call to sync_core() above the call to the modifiable local_irq_restore(). Signed-off-by: Ben Hutchings <ben@decadent.org.uk> LKML-Reference: <1252547631.3423.134.camel@localhost> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-09-11Merge branch 'next' into for-linusJames Morris
2009-09-10x86: split __phys_addr out into separate fileJeremy Fitzhardinge
Split __phys_addr out into its own file so we can disable -fstack-protector in a fine-grained fashion. Also it doesn't have terribly much to do with the rest of ioremap.c. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2009-09-10KVM: VMX: Check cpl before emulating debug register accessAvi Kivity
Debug registers may only be accessed from cpl 0. Unfortunately, vmx will code to emulate the instruction even though it was issued from guest userspace, possibly leading to an unexpected trap later. Cc: stable@kernel.org Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: fix misreporting of coalesced interrupts by kvm tracerGleb Natapov
Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: x86: drop duplicate kvm_flush_remote_tlb callsMarcelo Tosatti
kvm_mmu_slot_remove_write_access already calls it. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM: VMX: call vmx_load_host_state() only if msr is cachedGleb Natapov
No need to call it before each kvm_(set|get)_msr_common() Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: VMX: Conditionally reload debug register 6Avi Kivity
Only reload debug register 6 if we're running with the guest's debug registers. Saves around 150 cycles from the guest lightweight exit path. dr6 contains a couple of bits that are updated on #DB, so intercept that unconditionally and update those bits then. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2009-09-10KVM: Use thread debug register storage instead of kvm specific dataAvi Kivity
Instead of saving the debug registers from the processor to a kvm data structure, rely in the debug registers stored in the thread structure. This allows us not to save dr6 and dr7. Reduces lightweight vmexit cost by 350 cycles, or 11 percent. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10KVM guest: do not batch pte updates from interrupt contextMarcelo Tosatti
Commit b8bcfe997e4 made paravirt pte updates synchronous in interrupt context. Unfortunately the KVM pv mmu code caches the lazy/nonlazy mode internally, so a pte update from interrupt context during a lazy mmu operation can be batched while it should be performed synchronously. https://bugzilla.redhat.com/show_bug.cgi?id=518022 Drop the internal mode variable and use paravirt_get_lazy_mode(), which returns the correct state. Cc: stable@kernel.org Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10sparc64: Initial niagara2 perf counter support.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-10sparc64: Perf counter 'nop' event is not constant.David S. Miller
On Niagara-2, for example, it's going to be different. So make it something specified in sparc_pmu. Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-10sparc64: Provide a way to specify a perf counter overflow IRQ enable bit.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
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