lwn.git/include/linux, branch v4.18-rc5

Merge branch 'for-4.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata

2018-07-11T19:44:07+00:00

Pull libata fixes from Tejun Heo: - Jens's patches to expand the usable command depth from 31 to 32 broke sata_fsl due to a subtle command iteration bug. Fixed by introducing explicit iteration helpers and using the correct variant. - On some laptops, enabling LPM by default reportedly led to occasional hard hangs. Blacklist the affected cases. - Other misc fixes / changes. * 'for-4.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata: ata: Remove depends on HAS_DMA in case of platform dependency ata: Fix ZBC_OUT all bit handling ata: Fix ZBC_OUT command block check ahci: Add Intel Ice Lake LP PCI ID ahci: Disable LPM on Lenovo 50 series laptops with a too old BIOS sata_nv: remove redundant pointers sdev0 and sdev1 sata_fsl: remove dead code in tag retrieval sata_fsl: convert to command iterator libata: convert eh to command iterators libata: add command iterator helpers ata: ahci_mvebu: ahci_mvebu_stop_engine() can be static libahci: Fix possible Spectre-v1 pmp indexing in ahci_led_store()

Merge tag 'char-misc-4.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2018-07-11T17:10:50+00:00

Pull char/misc fixes from Greg KH: "Here are a few char/misc driver fixes for 4.18-rc5. The "largest" stuff here is fixes for the UIO changes in 4.18-rc1 that caused breakages for some people. Thanks to Xiubo Li for fixing them quickly. Other than that, minor fixes for thunderbolt, vmw_balloon, nvmem, mei, ibmasm, and mei drivers. There's also a MAINTAINERS update where Rafael is offering to help out with reviewing driver core patches. All of these have been in linux-next with no reported issues" * tag 'char-misc-4.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: nvmem: Don't let a NULL cell_id for nvmem_cell_get() crash us thunderbolt: Notify userspace when boot_acl is changed uio: fix crash after the device is unregistered uio: change to use the mutex lock instead of the spin lock uio: use request_threaded_irq instead fpga: altera-cvp: Fix an error handling path in 'altera_cvp_probe()' ibmasm: don't write out of bounds in read handler MAINTAINERS: Add myself as driver core changes reviewer mei: discard messages from not connected client during power down. vmw_balloon: fix inflation with batching

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

2018-07-10T00:16:11+00:00

Pull HID fixes from Jiri Kosina: - spectrev1 pattern fix in hiddev from Gustavo A. R. Silva - bounds check fix for hid-debug from Daniel Rosenberg - regression fix for HID autobinding from Benjamin Tissoires - removal of excessive logging from i2c-hid driver from Jason Andryuk - fix specific to 2nd generation of Wacom Intuos devices from Jason Gerecke * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: HID: hiddev: fix potential Spectre v1 HID: i2c-hid: Fix "incomplete report" noise HID: wacom: Correct touch maximum XY of 2nd-gen Intuos HID: debug: check length before copy_to_user() HID: core: allow concurrent registration of drivers

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-07-08T20:26:55+00:00

Pull x86 fixes from Thomas Gleixner: - Prevent an out-of-bounds access in mtrr_write() - Break a circular dependency in the new hyperv IPI acceleration code - Address the build breakage related to inline functions by enforcing gnu_inline and explicitly bringing native_save_fl() out of line, which also adds a set of _ARM_ARG macros which provide 32/64bit safety. - Initialize the shadow CR4 per cpu variable before using it. * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mtrr: Don't copy out-of-bounds data in mtrr_write x86/hyper-v: Fix the circular dependency in IPI enlightenment x86/paravirt: Make native_save_fl() extern inline x86/asm: Add _ASM_ARG* constants for argument registers to compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations x86/mm/32: Initialize the CR4 shadow before __flush_tlb_all()

Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-07-08T19:41:23+00:00

Pull scheduler fixes from Thomas Gleixner: - The hopefully final fix for the reported race problems in kthread_parkme(). The previous attempt still left a hole and was partially wrong. - Plug a race in the remote tick mechanism which triggers a warning about updates not being done correctly. That's a false positive if the race condition is hit as the remote CPU is idle. Plug it by checking the condition again when holding run queue lock. - Fix a bug in the utilization estimation of a run queue which causes the estimation to be 0 when a run queue is throttled. - Advance the global expiration of the period timer when the timer is restarted after a idle period. Otherwise the expiry time is stale and the timer fires prematurely. - Cure the drift between the bandwidth timer and the runqueue accounting, which leads to bogus throttling of runqueues - Place the call to cpufreq_update_util() correctly so the function will observe the correct number of running RT tasks and not a stale one. * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kthread, sched/core: Fix kthread_parkme() (again...) sched/util_est: Fix util_est_dequeue() for throttled cfs_rq sched/fair: Advance global expiration when period timer is restarted sched/fair: Fix bandwidth timer clock drift condition sched/rt: Fix call to cpufreq_update_util() sched/nohz: Skip remote tick on idle task entirely

uio: change to use the mutex lock instead of the spin lock

2018-07-07T14:57:35+00:00

We are hitting a regression with the following commit: commit a93e7b331568227500186a465fee3c2cb5dffd1f Author: Hamish Martin Date: Mon May 14 13:32:23 2018 +1200 uio: Prevent device destruction while fds are open The problem is the addition of spin_lock_irqsave in uio_write. This leads to hitting uio_write -> copy_from_user -> _copy_from_user -> might_fault and the logs filling up with sleeping warnings. I also noticed some uio drivers allocate memory, sleep, grab mutexes from callouts like open() and release and uio is now doing spin_lock_irqsave while calling them. Reported-by: Mike Christie CC: Hamish Martin Reviewed-by: Hamish Martin Signed-off-by: Xiubo Li Signed-off-by: Greg Kroah-Hartman

Merge tag 'trace-v4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2018-07-06T02:29:07+00:00

Pull tracing fixes and cleanups from Steven Rostedt: "While cleaning out my INBOX, I found a few patches that were lost in the noise. These are minor bug fixes and clean ups. Those include: - avoid a string overflow - code that didn't match the comment (but should) - a small code optimization (use of a conditional) - quiet printf warnings - nuke unused code - fix function graph interrupt annotation" * tag 'trace-v4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Fix missing return symbol in function_graph output ftrace: Nuke clear_ftrace_function tracing: Use __printf markup to silence compiler tracing: Optimize trace_buffer_iter() logic tracing: Make create_filter() code match the comments tracing: Avoid string overflow

ftrace: Nuke clear_ftrace_function

2018-07-03T22:33:19+00:00

clear_ftrace_function is not used outside of ftrace.c and is not help to use a function, so nuke it per Steve's suggestion. Link: http://lkml.kernel.org/r/1517537689-34947-1-git-send-email-xieyisheng1@huawei.com Suggested-by: Steven Rostedt Signed-off-by: Yisheng Xie Signed-off-by: Steven Rostedt (VMware)

compiler-gcc.h: Add attribute((gnu_inline)) to all inline declarations

2018-07-03T08:56:27+00:00

Functions marked extern inline do not emit an externally visible function when the gnu89 C standard is used. Some KBUILD Makefiles overwrite KBUILD_CFLAGS. This is an issue for GCC 5.1+ users as without an explicit C standard specified, the default is gnu11. Since c99, the semantics of extern inline have changed such that an externally visible function is always emitted. This can lead to multiple definition errors of extern inline functions at link time of compilation units whose build files have removed an explicit C standard compiler flag for users of GCC 5.1+ or Clang. Suggested-by: Arnd Bergmann Suggested-by: H. Peter Anvin Suggested-by: Joe Perches Signed-off-by: Nick Desaulniers Acked-by: Juergen Gross Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: acme@redhat.com Cc: akataria@vmware.com Cc: akpm@linux-foundation.org Cc: andrea.parri@amarulasolutions.com Cc: ard.biesheuvel@linaro.org Cc: aryabinin@virtuozzo.com Cc: astrachan@google.com Cc: boris.ostrovsky@oracle.com Cc: brijesh.singh@amd.com Cc: caoj.fnst@cn.fujitsu.com Cc: geert@linux-m68k.org Cc: ghackmann@google.com Cc: gregkh@linuxfoundation.org Cc: jan.kiszka@siemens.com Cc: jarkko.sakkinen@linux.intel.com Cc: jpoimboe@redhat.com Cc: keescook@google.com Cc: kirill.shutemov@linux.intel.com Cc: kstewart@linuxfoundation.org Cc: linux-efi@vger.kernel.org Cc: linux-kbuild@vger.kernel.org Cc: manojgupta@google.com Cc: mawilcox@microsoft.com Cc: michal.lkml@markovi.net Cc: mjg59@google.com Cc: mka@chromium.org Cc: pombredanne@nexb.com Cc: rientjes@google.com Cc: rostedt@goodmis.org Cc: sedat.dilek@gmail.com Cc: thomas.lendacky@amd.com Cc: tstellar@redhat.com Cc: tweek@google.com Cc: virtualization@lists.linux-foundation.org Cc: will.deacon@arm.com Cc: yamada.masahiro@socionext.com Link: http://lkml.kernel.org/r/20180621162324.36656-2-ndesaulniers@google.com Signed-off-by: Ingo Molnar

kthread, sched/core: Fix kthread_parkme() (again...)

2018-07-03T07:17:30+00:00

Gaurav reports that commit: 85f1abe0019f ("kthread, sched/wait: Fix kthread_parkme() completion issue") isn't working for him. Because of the following race: > controller Thread CPUHP Thread > takedown_cpu > kthread_park > kthread_parkme > Set KTHREAD_SHOULD_PARK > smpboot_thread_fn > set Task interruptible > > > wake_up_process > if (!(p->state & state)) > goto out; > > Kthread_parkme > SET TASK_PARKED > schedule > raw_spin_lock(&rq->lock) > ttwu_remote > waiting for __task_rq_lock > context_switch > > finish_lock_switch > > > > Case TASK_PARKED > kthread_park_complete > > > SET Running Furthermore, Oleg noticed that the whole scheduler TASK_PARKED handling is buggered because the TASK_DEAD thing is done with preemption disabled, the current code can still complete early on preemption :/ So basically revert that earlier fix and go with a variant of the alternative mentioned in the commit. Promote TASK_PARKED to special state to avoid the store-store issue on task->state leading to the WARN in kthread_unpark() -> __kthread_bind(). But in addition, add wait_task_inactive() to kthread_park() to ensure the task really is PARKED when we return from kthread_park(). This avoids the whole kthread still gets migrated nonsense -- although it would be really good to get this done differently. Reported-by: Gaurav Kohli Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: 85f1abe0019f ("kthread, sched/wait: Fix kthread_parkme() completion issue") Signed-off-by: Ingo Molnar