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2011-03-16Merge branch 'for-2.6.39' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu * 'for-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu, x86: Add arch-specific this_cpu_cmpxchg_double() support percpu: Generic support for this_cpu_cmpxchg_double() alpha: use L1_CACHE_BYTES for cacheline size in the linker script percpu: align percpu readmostly subsection to cacheline Fix up trivial conflict in arch/x86/kernel/vmlinux.lds.S due to the percpu alignment having changed ("x86: Reduce back the alignment of the per-CPU data section")
2011-03-15Merge branch 'core-locking-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rtmutex: tester: Remove the remaining BKL leftovers lockdep/timers: Explain in detail the locking problems del_timer_sync() may cause rtmutex: Simplify PI algorithm and make highest prio task get lock rwsem: Remove redundant asmregparm annotation rwsem: Move duplicate function prototypes to linux/rwsem.h rwsem: Unify the duplicate rwsem_is_locked() inlines rwsem: Move duplicate init macros and functions to linux/rwsem.h rwsem: Move duplicate struct rwsem declaration to linux/rwsem.h x86: Cleanup rwsem_count_t typedef rwsem: Cleanup includes locking: Remove deprecated lock initializers cred: Replace deprecated spinlock initialization kthread: Replace deprecated spinlock initialization xtensa: Replace deprecated spinlock initialization um: Replace deprecated spinlock initialization sparc: Replace deprecated spinlock initialization mips: Replace deprecated spinlock initialization cris: Replace deprecated spinlock initialization alpha: Replace deprecated spinlock initialization rtmutex-tester: Remove BKL tests
2011-03-11futex: Sanitize futex ops argument typesMichel Lespinasse
Change futex_atomic_op_inuser and futex_atomic_cmpxchg_inatomic prototypes to use u32 types for the futex as this is the data type the futex core code uses all over the place. Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Darren Hart <darren@dvhart.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <20110311025058.GD26122@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-11futex: Sanitize cmpxchg_futex_value_locked APIMichel Lespinasse
The cmpxchg_futex_value_locked API was funny in that it returned either the original, user-exposed futex value OR an error code such as -EFAULT. This was confusing at best, and could be a source of livelocks in places that retry the cmpxchg_futex_value_locked after trying to fix the issue by running fault_in_user_writeable(). This change makes the cmpxchg_futex_value_locked API more similar to the get_futex_value_locked one, returning an error code and updating the original value through a reference argument. Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile] Acked-by: Tony Luck <tony.luck@intel.com> [ia64] Acked-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Michal Simek <monstr@monstr.eu> [microblaze] Acked-by: David Howells <dhowells@redhat.com> [frv] Cc: Darren Hart <darren@dvhart.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <20110311024851.GC26122@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-02-17[S390] net: provide architecture specific NET_SKB_PADHorst Hartmann
NET_SKB_PAD has been increased from 32 to 64 and later to max(32, L1_CACHE_BYTES). This led to a 25% throughput decrease for streaming workloads accompanied by a 37% CPU cost increase on s390. Define a architecture specific NET_SKB_PAD with the old value of 32. Signed-off-by: Horst Hartmann <horsth@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-02-17[S390] atomic: use inline asmHeiko Carstens
Use inline assemblies for atomic_read/set(). This way there shouldn't be any questions or subtle volatile semantics left. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-02-17[S390] correct ipl parameter block safe guardMartin Schwidefsky
The 'output' variable is passed from decompress_kernel to check_ipl_parmblock before it is initialized. That disables the safe guard against the overwrite of the ipl parameter block. Fix this by passing the correct value to check_ipl_parmblock. Reported-by: David Binderman <dcb314@hotmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-02-17[S390] atomic: use ACCESS_ONCE() for atomic_read()Heiko Carstens
Let's make atomic_read() and atomic_set() behave like on all/most other architectures. Generated code is identical with gcc 4.5.2. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-02-16Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: sha-s390 - Reset index after processing partial block
2011-02-16Merge commit 'v2.6.38-rc5' into core/lockingIngo Molnar
Merge reason: pick up upstream fixes. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-02-15s390: remove task_show_regsMartin Schwidefsky
task_show_regs used to be a debugging aid in the early bringup days of Linux on s390. /proc/<pid>/status is a world readable file, it is not a good idea to show the registers of a process. The only correct fix is to remove task_show_regs. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-02-07crypto: sha-s390 - Reset index after processing partial blockHerbert Xu
The partial block handling in sha-s390 is broken when we get a partial block that is followed by an update which fills it with bytes left-over. Instead of storing the newly left-over bytes at the start of the buffer, it will be stored immediately after the previous partial block. This patch fixes this by resetting the index pointer. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2011-01-31[S390] reset default for CONFIG_CHSC_SCHSebastian Ott
6f9a3c33 "[S390] cleanup s390 Kconfig" accidentally changed the default for CONFIG_CHSC_SCH. Reset it to m. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-31[S390] use asm-generic/cacheflush.hAkinobu Mita
The implementation of the cache flushing interfaces on the s390 is identical with the default implementation in asm-generic. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-31[S390] tlb: fix build error caused by THPHeiko Carstens
Fix this build error with !CONFIG_SWAP caused by tranparent huge pages support: In file included from mm/pgtable-generic.c:9:0: /linux-2.6/arch/s390/include/asm/tlb.h: In function 'tlb_remove_page': /linux-2.6/arch/s390/include/asm/tlb.h:92:2: error: implicit declaration of function 'page_cache_release' Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-31[S390] missing sacf in uaccessMartin Schwidefsky
The uaccess functions copy_in_user_std and clear_user_std fail to switch back from secondary space mode to primary space mode with sacf in case of an unresolvable page fault. We need to make sure that the switch back to primary mode is done in all cases, otherwise the code following the uaccess inline assembly will crash. Reported-by: Alexander Graf <agraf@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-31[S390] pgtable_list corruptionMartin Schwidefsky
After page_table_free_rcu removed a page from the pgtable_list page_table_free better not add it again. Otherwise a page_table_alloc can reuse a page table fragment that is still in the rcu process. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-27rwsem: Move duplicate function prototypes to linux/rwsem.hThomas Gleixner
All architecture specific rwsem headers carry the same function prototypes. Just x86 adds asmregparm, which is an empty define on all other architectures. S390 has a stale rwsem_downgrade_write() prototype. Remove the duplicates and add the prototypes to linux/rwsem.h Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: David Miller <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> LKML-Reference: <20110126195833.970840140@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-01-27rwsem: Unify the duplicate rwsem_is_locked() inlinesThomas Gleixner
Instead of having the same implementation in each architecture, move it to linux/rwsem.h and remove the duplicates. It's unlikely that an arch will ever implement something different, but we can deal with that when it happens. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Matt Turner <mattst88@gmail.com> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: David Miller <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> LKML-Reference: <20110126195833.876773757@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-01-27rwsem: Move duplicate init macros and functions to linux/rwsem.hThomas Gleixner
The rwsem initializers and related macros and functions are mostly the same. Some of them lack the lockdep initializer, but having it in place does not matter for architectures which do not support lockdep. powerpc, sparc, x86: No functional change sh, s390: Removes the duplicate init_rwsem (inline and #define) alpha, ia64, xtensa: Use the lockdep capable init function in lib/rwsem.c which is just uninlining the init function for the LOCKDEP=n case Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Matt Turner <mattst88@gmail.com> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: David Miller <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> LKML-Reference: <20110126195833.771812729@linutronix.de>
2011-01-27rwsem: Move duplicate struct rwsem declaration to linux/rwsem.hThomas Gleixner
The difference between these declarations is the data type of the count member and the lack of lockdep in some architectures/ long is equivivalent to signed long and the #ifdef guarded dep_map member does not hurt anyone. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Matt Turner <mattst88@gmail.com> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: David Miller <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> LKML-Reference: <20110126195833.679641914@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-01-27rwsem: Cleanup includesThomas Gleixner
All rwsem implementations include the same headers. Include them from include/linux/rwsem.h Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Matt Turner <mattst88@gmail.com> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: David Miller <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> LKML-Reference: <20110126195833.483520950@linutronix.de>
2011-01-25percpu: align percpu readmostly subsection to cachelineTejun Heo
Currently percpu readmostly subsection may share cachelines with other percpu subsections which may result in unnecessary cacheline bounce and performance degradation. This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR() linker macros, makes each arch linker scripts specify its cacheline size and use it to align percpu subsections. This is based on Shaohua's x86 only patch. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Shaohua Li <shaohua.li@intel.com>
2011-01-14Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6Linus Torvalds
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: [S390] MAINTAINERS: Update zcrypt driver entry [S390] Randomize PIEs [S390] Randomise the brk region [S390] Add is_32bit_task() helper function [S390] Randomize lower bits of stack address [S390] Randomize mmap start address [S390] Rearrange mmap.c [S390] Enable flexible mmap layout for 64 bit processes [S390] vdso: dont map at mmap_base [S390] reduce miminum gap between stack and mmap_base [S390] mmap: consider stack address randomization [S390] Update default configuration [S390] cio: path_event overindication after resume
2011-01-13Merge branch 'kvm-updates/2.6.38' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
* 'kvm-updates/2.6.38' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (142 commits) KVM: Initialize fpu state in preemptible context KVM: VMX: when entering real mode align segment base to 16 bytes KVM: MMU: handle 'map_writable' in set_spte() function KVM: MMU: audit: allow audit more guests at the same time KVM: Fetch guest cr3 from hardware on demand KVM: Replace reads of vcpu->arch.cr3 by an accessor KVM: MMU: only write protect mappings at pagetable level KVM: VMX: Correct asm constraint in vmcs_load()/vmcs_clear() KVM: MMU: Initialize base_role for tdp mmus KVM: VMX: Optimize atomic EFER load KVM: VMX: Add definitions for more vm entry/exit control bits KVM: SVM: copy instruction bytes from VMCB KVM: SVM: implement enhanced INVLPG intercept KVM: SVM: enhance mov DR intercept handler KVM: SVM: enhance MOV CR intercept handler KVM: SVM: add new SVM feature bit names KVM: cleanup emulate_instruction KVM: move complete_insn_gp() into x86.c KVM: x86: fix CR8 handling KVM guest: Fix kvm clock initialization when it's configured out ...
2011-01-12KVM: Clean up vm creation and releaseJan Kiszka
IA64 support forces us to abstract the allocation of the kvm structure. But instead of mixing this up with arch-specific initialization and doing the same on destruction, split both steps. This allows to move generic destruction calls into generic code. It also fixes error clean-up on failures of kvm_create_vm for IA64. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-01-12[S390] Randomize PIEsHeiko Carstens
Randomize ELF_ET_DYN_BASE, which is used when loading position independent executables. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Randomise the brk regionHeiko Carstens
Randomize heap address like other architectures do already. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Add is_32bit_task() helper functionHeiko Carstens
Helper function which tells us if a task is running in ESA mode. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Randomize lower bits of stack addressHeiko Carstens
Randomize the lower bits of the stack address like x86 and powerpc. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Randomize mmap start addressHeiko Carstens
Randomize mmap start address with 8MB. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Rearrange mmap.cHeiko Carstens
Shuffle code around so it looks more like x86 and powerpc. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Enable flexible mmap layout for 64 bit processesHeiko Carstens
Historically 64 bit processes use the legacy address layout. However there is no reason why 64 bit processes shouldn't benefit from the flexible mmap layout advantages. Therefore just enable it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] vdso: dont map at mmap_baseHeiko Carstens
The vdso object is currently always mapped with mm->mmap_base used as requested address. In case of flexible mmap layout this means it gets mapped above mmap_base and therefore potentially stealing a bit of address space that is reserved for the stack. In case of flexible mmap layout the object should be mapped below mmap base. For legacy mmap layout above. To fix this just don't request any specific address and let the mmap code figure out an address that fits. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] reduce miminum gap between stack and mmap_baseHeiko Carstens
Reduce minimum gap between stack and mmap_base to 32MB. That way there is a bit more space for heap and mmap for tight 31 bit address spaces. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] mmap: consider stack address randomizationHeiko Carstens
Consider stack address randomization when calulating mmap_base for flexible mmap layout . Because of address randomization the stack address can be up to 8MB lower than STACK_TOP. When calculating mmap_base this isn't taken into account, which could lead to the case that the gap between the real stack top and mmap_base is lower than what ulimit specifies for the maximum stack size. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-12[S390] Update default configurationMartin Schwidefsky
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-07Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6Linus Torvalds
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (65 commits) [S390] prevent unneccesary loops_per_jiffy recalculation [S390] cpuinfo: use get_online_cpus() instead of preempt_disable() [S390] smp: remove cpu hotplug messages [S390] mutex: enable spinning mutex on s390 [S390] mutex: Introduce arch_mutex_cpu_relax() [S390] cio: fix ccwgroup unregistration race condition [S390] perf: add DWARF register lookup for s390 [S390] cleanup ftrace backend functions [S390] ptrace cleanup [S390] smp/idle: call init_idle() before starting a new cpu [S390] smp: delay idle task creation [S390] dasd: Correct retry counter for terminated I/O. [S390] dasd: Add support for raw ECKD access. [S390] dasd: Prevent deadlock during suspend/resume. [S390] dasd: Improve handling of stolen DASD reservation [S390] dasd: do path verification for paths added at runtime [S390] dasd: add High Performance FICON multitrack support [S390] cio: reduce memory consumption of itcw structures [S390] nmi: enable machine checks early [S390] qeth: buffer count imbalance ...
2011-01-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1436 commits) cassini: Use local-mac-address prom property for Cassini MAC address net: remove the duplicate #ifdef __KERNEL__ net: bridge: check the length of skb after nf_bridge_maybe_copy_header() netconsole: clarify stopping message netconsole: don't announce stopping if nothing happened cnic: Fix the type field in SPQ messages netfilter: fix export secctx error handling netfilter: fix the race when initializing nf_ct_expect_hash_rnd ipv4: IP defragmentation must be ECN aware net: r6040: Return proper error for r6040_init_one dcb: use after free in dcb_flushapp() dcb: unlock on error in dcbnl_ieee_get() net: ixp4xx_eth: Return proper error for eth_init_one include/linux/if_ether.h: Add #define ETH_P_LINK_CTL for HPNA and wlan local tunnel net: add POLLPRI to sock_def_readable() af_unix: Avoid socket->sk NULL OOPS in stream connect security hooks. net_sched: pfifo_head_drop problem mac80211: remove stray extern mac80211: implement off-channel TX using hw r-o-c offload mac80211: implement hardware offload for remain-on-channel ...
2011-01-05[S390] prevent unneccesary loops_per_jiffy recalculationHeiko Carstens
When the seqfile /proc/cpuinfo gets accesses for each possible cpu loops_per_jiffy gets recalculated. However its value is only needed on first access. In addition loops_per_jiffy should be recalculated when the machine reports a capability change. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] cpuinfo: use get_online_cpus() instead of preempt_disable()Heiko Carstens
Use get_online_cpus() instead of preempt_disable() to make sure cpus don't go offline while accessing their per cpu data. The preempt_disable() stuff is old code which was used before get_online_cpus() was available. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] smp: remove cpu hotplug messagesHeiko Carstens
Get rid of messages that indicate if a cpu went online or offline. There is nothing special about this anymore and these messages might flood the kernel log buffer which makes debugging harder since more important messages might be overwritten. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] mutex: enable spinning mutex on s390Gerald Schaefer
This enables the spinning mutex feature on s390 by removing HAVE_DEFAULT_NO_SPIN_MUTEXES from arch/s390/Kconfig. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] mutex: Introduce arch_mutex_cpu_relax()Gerald Schaefer
The spinning mutex implementation uses cpu_relax() in busy loops as a compiler barrier. Depending on the architecture, cpu_relax() may do more than needed in this specific mutex spin loops. On System z we also give up the time slice of the virtual cpu in cpu_relax(), which prevents effective spinning on the mutex. This patch replaces cpu_relax() in the spinning mutex code with arch_mutex_cpu_relax(), which can be defined by each architecture that selects HAVE_ARCH_MUTEX_CPU_RELAX. The default is still cpu_relax(), so this patch should not affect other architectures than System z for now. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1290437256.7455.4.camel@thinkpad> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-01-05[S390] cleanup ftrace backend functionsMartin Schwidefsky
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] ptrace cleanupMartin Schwidefsky
Overhaul program event recording and the code dealing with the ptrace user space interface. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] smp/idle: call init_idle() before starting a new cpuHeiko Carstens
Call init_idle() which (re-)initializes the idle task structure before it gets used on a new cpu. That way we can also get rid of the odd preempt_enable_no_resched() call we have in the cpu offline path within cpu_idle(). That call prevented preempt count imbalances between cpu hotplug operations. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] smp: delay idle task creationHeiko Carstens
Delay idle task creation until a cpu gets set online instead of creating them for all possible cpus at system startup. For one cpu system this should safe more than 1 MB. On my debug system with lots of debug stuff enabled this saves 2 MB. Same as on x86. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] dasd: Add support for raw ECKD access.Stefan Haberland
Normal I/O operations through the DASD device driver give only access to the data fields of an ECKD device even for track based I/O. This patch extends the DASD device driver to give access to whole ECKD tracks including count, key and data fields. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] dasd: Improve handling of stolen DASD reservationStefan Weinhuber
If a DASD device has been reserved by a Linux system, and later this reservation is ‘stolen’ by a second system by means of an unconditional reserve, then the first system receives a notification about this fact. With this patch such an event can be either ignored, as before, or it can be used to let the device fail all I/O request, so that the device will not block anymore. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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