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X-CSE-ConnectionGUID: FvnETj+gTgaqYG5ssQiR+w== X-CSE-MsgGUID: f2KcBAkGRXSiE65oLosnmg== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="29036137" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="29036137" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2024 02:55:46 -0700 X-CSE-ConnectionGUID: peiPcwBCQ2CGYzDPh13eXg== X-CSE-MsgGUID: 1H6X1Oq9T9KAlRXGupze/Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,225,1725346800"; d="scan'208";a="79819787" Received: from lkp-server01.sh.intel.com (HELO a48cf1aa22e8) ([10.239.97.150]) by fmviesa007.fm.intel.com with ESMTP; 23 Oct 2024 02:55:44 -0700 Received: from kbuild by a48cf1aa22e8 with local (Exim 4.96) (envelope-from ) id 1t3Y5d-000UlO-23; Wed, 23 Oct 2024 09:55:41 +0000 Date: Wed, 23 Oct 2024 17:54:56 +0800 From: kernel test robot To: Max Filippov Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev Subject: [jcmvbkbc-xtensa:xtensa-6.11-esp32 50/53] kernel/events/core.c:6492:15: warning: variable 'flags' set but not used Message-ID: <202410231726.jdjpxZSU-lkp@intel.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://github.com/jcmvbkbc/linux-xtensa xtensa-6.11-esp32 head: 3b01ad2a1f71b72b27fefa08e4bf6acbe1de874f commit: 45c61e979c95928370efa03921af750bcc394f18 [50/53] WIP: perf: support mmapping event on noMMU config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241023/202410231726.jdjpxZSU-lkp@intel.com/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241023/202410231726.jdjpxZSU-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202410231726.jdjpxZSU-lkp@intel.com/ All warnings (new ones prefixed by >>): >> kernel/events/core.c:6492:15: warning: variable 'flags' set but not used [-Wunused-but-set-variable] 6492 | int ret = 0, flags = 0; | ^ >> kernel/events/core.c:6708:15: warning: no previous prototype for function 'perf_get_unmapped_area' [-Wmissing-prototypes] 6708 | unsigned long perf_get_unmapped_area(struct file *file, | ^ kernel/events/core.c:6708:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 6708 | unsigned long perf_get_unmapped_area(struct file *file, | ^ | static kernel/events/core.c:6764:17: warning: unused function 'perf_mmap_capabilities' [-Wunused-function] 6764 | static unsigned perf_mmap_capabilities(struct file *file) | ^~~~~~~~~~~~~~~~~~~~~~ 3 warnings generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for ESP32_IPC Depends on [n]: OF [=n] && HAS_IOMEM [=y] Selected by [y]: - ESP32_WIFI_SHMEM [=y] && NETDEVICES [=y] && WLAN [=y] && WLAN_VENDOR_ESPRESSIF [=y] vim +/flags +6492 kernel/events/core.c 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6480 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6481 static int perf_mmap(struct file *file, struct vm_area_struct *vma) 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6482 { cdd6c482c9ff9c kernel/perf_event.c Ingo Molnar 2009-09-21 6483 struct perf_event *event = file->private_data; 22a4f650d686ee kernel/perf_counter.c Ingo Molnar 2009-06-01 6484 unsigned long user_locked, user_lock_limit; 789f90fcf6b0b5 kernel/perf_counter.c Peter Zijlstra 2009-05-15 6485 struct user_struct *user = current_user(); 2ab9d830262c13 kernel/events/core.c Peter Zijlstra 2024-09-02 6486 struct mutex *aux_mutex = NULL; 56de4e8f914668 kernel/events/core.c Steven Rostedt (VMware 2019-12-13 6487) struct perf_buffer *rb = NULL; 22a4f650d686ee kernel/perf_counter.c Ingo Molnar 2009-06-01 6488 unsigned long locked, lock_limit; 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6489 unsigned long vma_size; 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6490 unsigned long nr_pages; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6491 long user_extra = 0, extra = 0; d57e34fdd60be7 kernel/perf_event.c Peter Zijlstra 2010-05-28 @6492 int ret = 0, flags = 0; 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6493 c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6494 /* c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6495 * Don't allow mmap() of inherited per-task counters. This would c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6496 * create a performance issue due to all children writing to the 76369139ceb955 kernel/events/core.c Frederic Weisbecker 2011-05-19 6497 * same rb. c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6498 */ c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6499 if (event->cpu == -1 && event->attr.inherit) c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6500 return -EINVAL; c7920614cebbf2 kernel/perf_event.c Peter Zijlstra 2010-05-18 6501 43a21ea81a2400 kernel/perf_counter.c Peter Zijlstra 2009-03-25 6502 if (!(vma->vm_flags & VM_SHARED)) 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6503 return -EINVAL; 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6504 da97e18458fb42 kernel/events/core.c Joel Fernandes (Google 2019-10-14 6505) ret = security_perf_event_read(event); da97e18458fb42 kernel/events/core.c Joel Fernandes (Google 2019-10-14 6506) if (ret) da97e18458fb42 kernel/events/core.c Joel Fernandes (Google 2019-10-14 6507) return ret; da97e18458fb42 kernel/events/core.c Joel Fernandes (Google 2019-10-14 6508) 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6509 vma_size = vma->vm_end - vma->vm_start; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6510 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6511 if (vma->vm_pgoff == 0) { 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6512 nr_pages = (vma_size / PAGE_SIZE) - 1; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6513 } else { 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6514 /* 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6515 * AUX area mapping: if rb->aux_nr_pages != 0, it's already 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6516 * mapped, all subsequent mappings should have the same size 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6517 * and offset. Must be above the normal perf buffer. 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6518 */ 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6519 u64 aux_offset, aux_size; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6520 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6521 if (!event->rb) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6522 return -EINVAL; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6523 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6524 nr_pages = vma_size / PAGE_SIZE; dbc48c8f41c208 kernel/events/core.c Adrian Hunter 2024-06-24 6525 if (nr_pages > INT_MAX) dbc48c8f41c208 kernel/events/core.c Adrian Hunter 2024-06-24 6526 return -ENOMEM; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6527 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6528 mutex_lock(&event->mmap_mutex); 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6529 ret = -EINVAL; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6530 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6531 rb = event->rb; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6532 if (!rb) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6533 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6534 2ab9d830262c13 kernel/events/core.c Peter Zijlstra 2024-09-02 6535 aux_mutex = &rb->aux_mutex; 2ab9d830262c13 kernel/events/core.c Peter Zijlstra 2024-09-02 6536 mutex_lock(aux_mutex); 2ab9d830262c13 kernel/events/core.c Peter Zijlstra 2024-09-02 6537 6aa7de059173a9 kernel/events/core.c Mark Rutland 2017-10-23 6538 aux_offset = READ_ONCE(rb->user_page->aux_offset); 6aa7de059173a9 kernel/events/core.c Mark Rutland 2017-10-23 6539 aux_size = READ_ONCE(rb->user_page->aux_size); 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6540 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6541 if (aux_offset < perf_data_size(rb) + PAGE_SIZE) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6542 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6543 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6544 if (aux_offset != vma->vm_pgoff << PAGE_SHIFT) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6545 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6546 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6547 /* already mapped with a different offset */ 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6548 if (rb_has_aux(rb) && rb->aux_pgoff != vma->vm_pgoff) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6549 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6550 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6551 if (aux_size != vma_size || aux_size != nr_pages * PAGE_SIZE) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6552 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6553 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6554 /* already mapped with a different size */ 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6555 if (rb_has_aux(rb) && rb->aux_nr_pages != nr_pages) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6556 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6557 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6558 if (!is_power_of_2(nr_pages)) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6559 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6560 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6561 if (!atomic_inc_not_zero(&rb->mmap_count)) 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6562 goto aux_unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6563 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6564 if (rb_has_aux(rb)) { 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6565 atomic_inc(&rb->aux_mmap_count); 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6566 ret = 0; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6567 goto unlock; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6568 } 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6569 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6570 atomic_set(&rb->aux_mmap_count, 1); 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6571 user_extra = nr_pages; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6572 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6573 goto accounting; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6574 } 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6575 7730d8655880f4 kernel/perf_counter.c Peter Zijlstra 2009-03-25 6576 /* 76369139ceb955 kernel/events/core.c Frederic Weisbecker 2011-05-19 6577 * If we have rb pages ensure they're a power-of-two number, so we 7730d8655880f4 kernel/perf_counter.c Peter Zijlstra 2009-03-25 6578 * can do bitmasks instead of modulo. 7730d8655880f4 kernel/perf_counter.c Peter Zijlstra 2009-03-25 6579 */ 2ed11312eb1950 kernel/events/core.c Kan Liang 2015-03-02 6580 if (nr_pages != 0 && !is_power_of_2(nr_pages)) 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6581 return -EINVAL; 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6582 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6583 if (vma_size != PAGE_SIZE * (1 + nr_pages)) 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6584 return -EINVAL; 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6585 cdd6c482c9ff9c kernel/perf_event.c Ingo Molnar 2009-09-21 6586 WARN_ON_ONCE(event->ctx->parent_ctx); 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6587 again: cdd6c482c9ff9c kernel/perf_event.c Ingo Molnar 2009-09-21 6588 mutex_lock(&event->mmap_mutex); 76369139ceb955 kernel/events/core.c Frederic Weisbecker 2011-05-19 6589 if (event->rb) { 60490e7966659b kernel/events/core.c Zhipeng Xie 2022-02-09 6590 if (data_page_nr(event->rb) != nr_pages) { ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6591 ret = -EINVAL; ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6592 goto unlock; ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6593 } ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6594 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6595 if (!atomic_inc_not_zero(&event->rb->mmap_count)) { 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6596 /* 68e3c69803dada kernel/events/core.c Peter Zijlstra 2022-07-05 6597 * Raced against perf_mmap_close(); remove the 68e3c69803dada kernel/events/core.c Peter Zijlstra 2022-07-05 6598 * event and try again. 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6599 */ 68e3c69803dada kernel/events/core.c Peter Zijlstra 2022-07-05 6600 ring_buffer_attach(event, NULL); 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6601 mutex_unlock(&event->mmap_mutex); 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6602 goto again; 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6603 } 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6604 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6605 goto unlock; 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6606 } 9bb5d40cd93c9d kernel/events/core.c Peter Zijlstra 2013-06-04 6607 789f90fcf6b0b5 kernel/perf_counter.c Peter Zijlstra 2009-05-15 6608 user_extra = nr_pages + 1; 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6609 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6610 accounting: cdd6c482c9ff9c kernel/perf_event.c Ingo Molnar 2009-09-21 6611 user_lock_limit = sysctl_perf_event_mlock >> (PAGE_SHIFT - 10); a3862d3f814ce7 kernel/perf_counter.c Ingo Molnar 2009-05-24 6612 a3862d3f814ce7 kernel/perf_counter.c Ingo Molnar 2009-05-24 6613 /* a3862d3f814ce7 kernel/perf_counter.c Ingo Molnar 2009-05-24 6614 * Increase the limit linearly with more CPUs: a3862d3f814ce7 kernel/perf_counter.c Ingo Molnar 2009-05-24 6615 */ a3862d3f814ce7 kernel/perf_counter.c Ingo Molnar 2009-05-24 6616 user_lock_limit *= num_online_cpus(); a3862d3f814ce7 kernel/perf_counter.c Ingo Molnar 2009-05-24 6617 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6618 user_locked = atomic_long_read(&user->locked_vm); 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6619 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6620 /* 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6621 * sysctl_perf_event_mlock may have changed, so that 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6622 * user->locked_vm > user_lock_limit 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6623 */ 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6624 if (user_locked > user_lock_limit) 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6625 user_locked = user_lock_limit; 003461559ef7a9 kernel/events/core.c Song Liu 2020-01-23 6626 user_locked += user_extra; c5078f78b455fb kernel/perf_counter.c Peter Zijlstra 2009-05-05 6627 c4b75479741c9c kernel/events/core.c Alexander Shishkin 2019-11-20 6628 if (user_locked > user_lock_limit) { d44248a4133773 kernel/events/core.c Song Liu 2019-09-04 6629 /* d44248a4133773 kernel/events/core.c Song Liu 2019-09-04 6630 * charge locked_vm until it hits user_lock_limit; d44248a4133773 kernel/events/core.c Song Liu 2019-09-04 6631 * charge the rest from pinned_vm d44248a4133773 kernel/events/core.c Song Liu 2019-09-04 6632 */ 789f90fcf6b0b5 kernel/perf_counter.c Peter Zijlstra 2009-05-15 6633 extra = user_locked - user_lock_limit; d44248a4133773 kernel/events/core.c Song Liu 2019-09-04 6634 user_extra -= extra; d44248a4133773 kernel/events/core.c Song Liu 2019-09-04 6635 } 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6636 78d7d407b62a02 kernel/perf_event.c Jiri Slaby 2010-03-05 6637 lock_limit = rlimit(RLIMIT_MEMLOCK); 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6638 lock_limit >>= PAGE_SHIFT; 70f8a3ca68d3e1 kernel/events/core.c Davidlohr Bueso 2019-02-06 6639 locked = atomic64_read(&vma->vm_mm->pinned_vm) + extra; 37d81828385f8f kernel/perf_counter.c Paul Mackerras 2009-03-23 6640 da97e18458fb42 kernel/events/core.c Joel Fernandes (Google 2019-10-14 6641) if ((locked > lock_limit) && perf_is_paranoid() && 459ec28ab404d7 kernel/perf_counter.c Ingo Molnar 2009-09-13 6642 !capable(CAP_IPC_LOCK)) { ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6643 ret = -EPERM; ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6644 goto unlock; ebb3c4c4cb81d6 kernel/perf_counter.c Peter Zijlstra 2009-04-06 6645 } 7b732a75047738 kernel/perf_counter.c Peter Zijlstra 2009-03-23 6646 45bfb2e50471ab kernel/events/core.c Peter Zijlstra 2015-01-14 6647 WARN_ON(!rb && event->rb); 906010b2134e14 kernel/perf_event.c Peter Zijlstra 2009-09-21 6648 d57e34fdd60be7 kernel/perf_event.c Peter Zijlstra 2010-05-28 6649 if (vma->vm_flags & VM_WRITE) 76369139ceb955 kernel/events/core.c Frederic Weisbecker 2011-05-19 6650 flags |= RING_BUFFER_WRITABLE; d57e34fdd60be7 kernel/perf_event.c Peter Zijlstra 2010-05-28 6651 :::::: The code at line 6492 was first introduced by commit :::::: d57e34fdd60be7ffd0b1d86bfa1a553df86b7172 perf: Simplify the ring-buffer logic: make perf_buffer_alloc() do everything needed :::::: TO: Peter Zijlstra :::::: CC: Ingo Molnar -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki