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* s390/scm_block: handle multiple requests in one HW requestSebastian Ott2014-12-083-63/+132
| | | | | | | | | | | Handle up to 8 block layer requests per HW request. These requests can be processed in parallel on the device leading to better throughput (and less interrupts). The overhead for additional requests is small since we don't blindly allocate new aidaws but try to use what's left of the previous one. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/scm_block: allocate aidaw pages only when necessarySebastian Ott2014-12-083-12/+36
| | | | | | | | | | | AOBs (the structure describing the HW request) need to be 4K aligned but very little of that page is actually used. With this patch we place aidaws at the end of the AOB page and only allocate a separate page for aidaws when we have to (lists of aidaws must not cross page boundaries). Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/scm_block: use mempool to manage aidaw requestsSebastian Ott2014-12-083-12/+55
| | | | | | | | | We currently use one preallocated page per HW request to store aidaws. With this patch we use mempool to allocate an aidaw page whenever we need it. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/eadm: change timeout valueSebastian Ott2014-12-081-1/+1
| | | | | | | | | Tests have shown that 5 seconds is sometimes not enough for an IRQ to arrive (especially when the device is doing garbage collection). Let's wait a little longer. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: fix memory leak of ptlock in pmd_free_tlbMartin Schwidefsky2014-12-081-0/+1
| | | | | | | | The pmd_free_tlb function fails to call pgtable_pmd_page_dtor. Without the call the ptlock for the pmd tables will not be freed. Add the missing call. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: use local symbol names in entry[64].SMartin Schwidefsky2014-12-082-398/+398
| | | | | | | To improve the output of the perf tool hide most of the symbols from entry[64].S by using the '.L' prefix. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ptrace: always include vector registers in core filesMartin Schwidefsky2014-12-081-10/+8
| | | | | | | | | | | On machines with support for vector registers the signal frame includes an area for the vector registers and the ptrace regset interface allow read and write. This is true even if the task never used any vector instruction. Only elf core dumps do not include the vector registers, to make things consistent always include the vector register note in core dumps create on a machine with vector register support. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/simd: clear vector register pointer on fork/cloneMartin Schwidefsky2014-12-081-0/+1
| | | | | | | | | The copy_thread function fails to reset the p->thread.vxrs pointer. This causes the child to use the same vector register save area, causing both data corruptions and multiple frees of the memory for the save area after the tasks sharing the save area terminate. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: translate cputime magic constants to macrosFrederic Weisbecker2014-12-081-22/+24
| | | | | | | | | | | | | | | | | | | Make the code more self-explanatory by naming magic constants. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/idle: convert open coded idle time seqcountFrederic Weisbecker2014-12-082-14/+13
| | | | | | | | | | | | | | | | | | | | s390 uses open coded seqcount to synchronize idle time accounting. Lets consolidate it with the standard API. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/idle: add missing irq off lockdep annotationHeiko Carstens2014-12-081-0/+2
| | | | | | | | psw_idle() returns with interrupts disabled, so we should add the missing annotation. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/debug: avoid function call for debug_sprintf_*Christian Borntraeger2014-12-082-10/+31
| | | | | | | | | | | | | | | | | | debug_sprintf_event/exception are called even for debug events with a disabling debug level. All other functions already do the check in a wrapper function. Lets do the same here. Due to the var_args the compiler rejects to make this function inline. So let's wrap this via a macro. This patch saves around 80 ns on my z196 for a KVM round trip (we have two debug statements for entry and exit) when KVM is build as a module. The savings for built-in drivers is smaller as we then avoid the PLT overhead for a function call. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/kprobes: fix instruction copy for out of line executionHeiko Carstens2014-12-011-1/+1
| | | | | | | | | | | | | When we generate the instruction for out of line execution the length of the to be copied instruction was evaluated from a not initialized memory location. Therefore we ended up with a random (2, 4 or 6) number of bytes being copied instead of taking the real instruction length into account. This works surprisingly well most of the time, but still not always. Reported-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: remove diag 44 calls from cpu_relax()Heiko Carstens2014-11-281-2/+0
| | | | | | | | | | Simplify cpu_relax() to a simple barrier(). Performance wise this doesn't seem to make any big difference anymore, since nearly all lock variants have directed yield semantics in the meantime. Also this makes s390 behave like all other architectures. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: retry partition detectionStefan Haberland2014-11-281-2/+24
| | | | | | | | | | In case somebody attempted to open the device during online processing the partition detection ioctl may have failed. Added a retry loop to avoid not detected partitions. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: fix list corruption for sleep_on requestsStefan Haberland2014-11-281-3/+0
| | | | | | | | | | Fix race for sleep_on requests leading to list corruption. The SLEEP_ON_END_TAG is set during CQR clean up. Remove it from interrupt handler to avoid the CQR from being cleared when it is still in the device_queue. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: fix infinite term I/O loopStefan Haberland2014-11-281-0/+14
| | | | | | | | | | | During device activation all paths could be lost and since the device is not active it has no indication of this fact - hence the CQR will time-out. The following cancelation might fail with -EINVAL because CIO took over control and started path verification. In this case mark the CQR as being CLEARED since it could not be running any more. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: remove unused codeStefan Haberland2014-11-281-12/+2
| | | | | Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: Deletion of unnecessary checks before the function call ↵Markus Elfring2014-11-281-5/+2
| | | | | | | | | | | | | "debug_unregister" The debug_unregister() function performs also input parameter validation. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ftrace: provide working ftrace_return_address()Heiko Carstens2014-11-281-0/+2
| | | | | | | | | | | | | | | | The common code ftrace_return_address(n), which is just a wrapper for __builtin_return_address(n), will only work for n > 0 if CONFIG_FRAME_POINTER is set to 'y'. Otherwise it will return 0. Since on s390 we will never have that config option set to 'y' ftrace_return_address() won't work at all for n > 0. Luckily we always compile the kernel with -mkernel-backchain which in turn means that __builtin_return_address(n) will always work. So let ftrace_return_address(n) map to __builtin_return_address(n). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/sclp_async: add Kconfig option to specify the component idMartin Schwidefsky2014-11-282-1/+12
| | | | | | | | Allow to specify the Compoment ID for Call Home via the kernel configuration. This removes the need for distribution specific patch against the sclp_async.c source file. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/traps: die on translation exceptionsHeiko Carstens2014-11-211-2/+6
| | | | | | | | | | | | Translation exceptions should never happen, since that implies that either we screwed up the page tables or missed to properly flush the TLB. In both cases we should not just simply kill user space or walk the kernel exception tables. Instead an oops or a panic (panic_on_oops) is the better answer. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/traps: print interrupt code and instruction length codeHeiko Carstens2014-11-213-4/+6
| | | | | | | | | | | | It always confuses me to see the mixed instruction length code and interruption code on user space faults, while the message clearly says it is the interruption code. So split the value and print both values separately. Also add the ILC output to the die() message, so thar user and kernel space faults contain the same information. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/kernel: add system calls for PCI memory accessAlexey Ishchuk2014-11-197-2/+127
| | | | | | | | | | | Add the new __NR_s390_pci_mmio_write and __NR_s390_pci_mmio_read system calls to allow user space applications to access device PCI I/O memory pages on s390x platform. [ Martin Schwidefsky: some code beautification ] Signed-off-by: Alexey Ishchuk <aishchuk@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: fix ptrace of user area if the inferior uses vector registersMartin Schwidefsky2014-11-191-22/+75
| | | | | | | | | | | | The floating point registers of a process that uses vector instruction are not store into task->thread.fp_regs anymore but in the upper halves of the first 16 vector registers. The ptrace interface for the peeks and pokes to the user area fails to take this into account. Fix __peek_user[_compat] and __poke_user[_compat] to use the vector array for the floating pointer register if the process has one. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/irq: use irq 0Sebastian Ott2014-11-182-11/+5
| | | | | | | | | | Irq 0 is currently unused on s390. Since there is no reason to do this start counting at the beginning and gain an additional irq. Also correctly report the smallest usable irq number for dynamic allocation. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/io: add ioport_map stubsFrank Blaschka2014-11-181-0/+9
| | | | | | | add ioport_map stubs to make vfio build on s390. Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/docs: Remove sections that are not related to s390Thomas Huth2014-11-181-374/+0
| | | | | | | | | Information how to use the GCC pre-processor, objdump, strace, top, etc. are generic and not specific to the S390 architecture, so we do not need this information in Debugging390.txt Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/docs: Fix the documentation of the address spacesThomas Huth2014-11-181-27/+61
| | | | | | | | | | | The information about the address spaces was completely outdated, since the usage of the address spaces changed quite a bit since the early days. This patch now updates the information about the usage of the address spaces, mostly by using the description from Heiko's patch "rework uaccess code - fix locking issues" (457f2180951cdcbfb4657ddcc83b486e93497f56). Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/cpum_sf: Remove initialization of PMU event indexHendrik Brueckner2014-11-031-1/+0
| | | | | | | | | | The git commit c719f56092add9b3d4192f57c64ce7af11105130 "perf: Fix and clean up initialization of pmu::event_idx" removed the PMU event index callback for all architectures but x86, remove the initialization of the event index as well. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/signal: add sparse annotationsMartin Schwidefsky2014-11-032-2/+2
| | | | | | | | | | | | | | | | Fix the following warnings from the sparse code checker: arch/s390/kernel/signal.c:374:38: warning: cast removes address space of expression arch/s390/kernel/signal.c:374:65: warning: incorrect type in initializer (different address spaces) arch/s390/kernel/signal.c:374:65: expected unsigned short [noderef] [usertype] <asn:1>*svc arch/s390/kernel/signal.c:374:65: got void * arch/s390/kernel/compat_signal.c:437:38: warning: cast removes address space of expression arch/s390/kernel/compat_signal.c:437:65: warning: incorrect type in initializer (different address spaces) arch/s390/kernel/compat_signal.c:437:65: expected unsigned short [noderef] [usertype] <asn:1>*svc arch/s390/kernel/compat_signal.c:437:65: got void * Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: use correct unlock function in gmap_ipte_notifyMartin Schwidefsky2014-11-031-1/+1
| | | | | | | | The page table lock is acquired with a call to get_locked_pte, replace the plain spin_unlock with the correct unlock function pte_unmap_unlock. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: add sparse annotationsMartin Schwidefsky2014-11-032-4/+8
| | | | | | | | | | | | Fix the following warnings from the sparse code checker: arch/s390/include/asm/pci_io.h:165:49: warning: cast removes address space of expression arch/s390/pci/pci.c:476:44: warning: cast removes address space of expression arch/s390/pci/pci.c:491:36: warning: incorrect type in argument 2 (different address spaces) arch/s390/pci/pci.c:491:36: expected void [noderef] <asn:2>*addr arch/s390/pci/pci.c:491:36: got void *<noident> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: improve irq number check for msixSebastian Ott2014-11-033-6/+3
| | | | | | | | | | | | | | | | s390s arch_setup_msi_irqs function ensures that we don't return with more irqs than the PCI architecture allows and that a single PCI function doesn't consume more irqs than the kernel is configured for. At least the last check doesn't help much and should take the sum of all irqs into account. Since that's already done by irq_alloc_desc we can remove this check. As for the first check we should use the value provided by the firmware which can be less than what the PCI architecture allows. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/cmpxchg: use compiler builtinsMartin Schwidefsky2014-11-033-234/+19
| | | | | | | | | | | | | | | | The kernel build for s390 fails for gcc compilers with version 3.x, set the minimum required version of gcc to version 4.3. As the atomic builtins are available with all gcc 4.x compilers, use the __sync_val_compare_and_swap and __sync_bool_compare_and_swap functions to replace the complex macro and inline assembler magic in include/asm/cmpxchg.h. The compiler can just-do-it and generates better code with the builtins. While we are at it use __sync_bool_compare_and_swap for the _raw_compare_and_swap function in the spinlock code as well. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: pmdp_get_and_clear_full optimizationMartin Schwidefsky2014-10-273-1/+26
| | | | | | | | | Analog to ptep_get_and_clear_full define a variant of the pmpd_get_and_clear primitive which gets the full hint from the mmu_gather struct. This allows s390 to avoid a costly instruction when destroying an address space. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: missing pte for gmap_ipte_notify should trigger a VM_BUGDominik Dingel2014-10-271-2/+1
| | | | | | | | After fixup_user_fault does not fail we have a writeable pte. That pte might transform but it should not vanish. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/kprobes: make use of NOKPROBE_SYMBOL()Heiko Carstens2014-10-277-46/+74
| | | | | | | Use NOKPROBE_SYMBOL() instead of __kprobes annotation. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ftrace,kprobes: allow to patch first instructionHeiko Carstens2014-10-2713-92/+214
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the function tracer is enabled, allow to set kprobes on the first instruction of a function (which is the function trace caller): If no kprobe is set handling of enabling and disabling function tracing of a function simply patches the first instruction. Either it is a nop (right now it's an unconditional branch, which skips the mcount block), or it's a branch to the ftrace_caller() function. If a kprobe is being placed on a function tracer calling instruction we encode if we actually have a nop or branch in the remaining bytes after the breakpoint instruction (illegal opcode). This is possible, since the size of the instruction used for the nop and branch is six bytes, while the size of the breakpoint is only two bytes. Therefore the first two bytes contain the illegal opcode and the last four bytes contain either "0" for nop or "1" for branch. The kprobes code will then execute/simulate the correct instruction. Instruction patching for kprobes and function tracer is always done with stop_machine(). Therefore we don't have any races where an instruction is patched concurrently on a different cpu. Besides that also the program check handler which executes the function trace caller instruction won't be executed concurrently to any stop_machine() execution. This allows to keep full fault based kprobes handling which generates correct pt_regs contents automatically. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* kprobes: introduce weak arch_check_ftrace_location() helper functionHeiko Carstens2014-10-272-7/+12
| | | | | | | | | | | | Introduce weak arch_check_ftrace_location() helper function which architectures can override in order to implement handling of kprobes on function tracer call sites on their own, without depending on common code or implementing the KPROBES_ON_FTRACE feature. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: disable KSM for storage key enabled pagesDominik Dingel2014-10-273-7/+28
| | | | | | | | | | When storage keys are enabled unmerge already merged pages and prevent new pages from being merged. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: prevent and break zero page mappings in case of storage keysDominik Dingel2014-10-272-1/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | As soon as storage keys are enabled we need to stop working on zero page mappings to prevent inconsistencies between storage keys and pgste. Otherwise following data corruption could happen: 1) guest enables storage key 2) guest sets storage key for not mapped page X -> change goes to PGSTE 3) guest reads from page X -> as X was not dirty before, the page will be zero page backed, storage key from PGSTE for X will go to storage key for zero page 4) guest sets storage key for not mapped page Y (same logic as above 5) guest reads from page Y -> as Y was not dirty before, the page will be zero page backed, storage key from PGSTE for Y will got to storage key for zero page overwriting storage key for X While holding the mmap sem, we are safe against changes on entries we already fixed, as every fault would need to take the mmap_sem (read). Other vCPUs executing storage key instructions will get a one time interception and be serialized also with mmap_sem. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* mm: introduce mm_forbids_zeropage functionDominik Dingel2014-10-273-2/+13
| | | | | | | | | | Add a new function stub to allow architectures to disable for an mm_structthe backing of non-present, anonymous pages with read-only empty zero pages. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: recfactor global pgste updatesDominik Dingel2014-10-274-102/+56
| | | | | | | | | | | Replace the s390 specific page table walker for the pgste updates with a call to the common code walk_page_range function. There are now two pte modification functions, one for the reset of the CMMA state and another one for the initialization of the storage keys. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: update default configurationMartin Schwidefsky2014-10-275-74/+32
| | | | Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/vdso: fix stack corruptionHeiko Carstens2014-10-274-16/+29
| | | | | | | | | | | | | | The kernel provided vdso functions do not get a stack frame from the calling function and therefore may not change the stack contents, unless they allocate space on their own. This problem was exposed with 070b7be633dc "s390/vdso: replace stck with stcke" which writes 16 bytes instead of 8 bytes into the stack frame. These additional 8 bytes however were indeed used by the caller (glibc) to save data and therefore this data was corrupted by the vdso code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/time: use stck clock fast for do_account_vtimeMartin Schwidefsky2014-10-271-0/+4
| | | | | | | The last high frequency call site of the STCK instruction is do_account_vtime. Replace it with the faster STCKF instruction. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Linux 3.18-rc2v3.18-rc2Linus Torvalds2014-10-271-1/+1
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* Merge tag 'armsoc-for-rc2' of ↵Linus Torvalds2014-10-2618-46/+107
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC fixes from Olof Johansson: "Another week, another small batch of fixes. Most of these make zynq, socfpga and sunxi platforms work a bit better: - due to new requirements for regulators, DWMMC on socfpga broke past v3.17 - SMP spinup fix for socfpga - a few DT fixes for zynq - another option (FIXED_REGULATOR) for sunxi is needed that used to be selected by other options but no longer is. - a couple of small DT fixes for at91 - ...and a couple for i.MX" * tag 'armsoc-for-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: ARM: dts: imx28-evk: Let i2c0 run at 100kHz ARM: i.MX6: Fix "emi" clock name typo ARM: multi_v7_defconfig: enable CONFIG_MMC_DW_ROCKCHIP ARM: sunxi_defconfig: enable CONFIG_REGULATOR_FIXED_VOLTAGE ARM: dts: socfpga: Add a 3.3V fixed regulator node ARM: dts: socfpga: Fix SD card detect ARM: dts: socfpga: rename gpio nodes ARM: at91/dt: sam9263: fix PLLB frequencies power: reset: at91-reset: fix power down register MAINTAINERS: add atmel ssc driver maintainer entry arm: socfpga: fix fetching cpu1start_addr for SMP ARM: zynq: DT: trivial: Fix mc node ARM: zynq: DT: Add cadence watchdog node ARM: zynq: DT: Add missing reference for memory-controller ARM: zynq: DT: Add missing reference for ADC ARM: zynq: DT: Add missing address for L2 pl310 ARM: zynq: DT: Remove 222 MHz OPP ARM: zynq: DT: Fix GEM register area size
| * Merge tag 'imx-fixes-3.18' of ↵Olof Johansson2014-10-263-12/+11
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into fixes Merge "ARM: imx: fixes for 3.18" from Shawn Guo: The i.MX fixes for 3.18: - Revert one patch which increases I2C bus frequency on imx28-evk - Fix a typo on imx6q EIM clock name * tag 'imx-fixes-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux: ARM: dts: imx28-evk: Let i2c0 run at 100kHz ARM: i.MX6: Fix "emi" clock name typo Signed-off-by: Olof Johansson <olof@lixom.net>
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-27 03:37:52 +0100