/* * fs/f2fs/gc.h * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define GC_THREAD_MIN_WB_PAGES 1 /* * a threshold to determine * whether IO subsystem is idle * or not */ #define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */ #define DEF_GC_THREAD_MAX_SLEEP_TIME 60000 #define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */ #define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */ #define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */ /* Search max. number of dirty segments to select a victim segment */ #define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */ struct f2fs_gc_kthread { struct task_struct *f2fs_gc_task; wait_queue_head_t gc_wait_queue_head; /* for gc sleep time */ unsigned int min_sleep_time; unsigned int max_sleep_time; unsigned int no_gc_sleep_time; /* for changing gc mode */ unsigned int gc_idle; }; struct gc_inode_list { struct list_head ilist; struct radix_tree_root iroot; }; /* * inline functions */ static inline block_t free_user_blocks(struct f2fs_sb_info *sbi) { if (free_segments(sbi) < overprovision_segments(sbi)) return 0; else return (free_segments(sbi) - overprovision_segments(sbi)) << sbi->log_blocks_per_seg; } static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi) { return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100; } static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi) { block_t reclaimable_user_blocks = sbi->user_block_count - written_block_count(sbi); return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100; } static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th, long *wait) { if (*wait == gc_th->no_gc_sleep_time) return; *wait += gc_th->min_sleep_time; if (*wait > gc_th->max_sleep_time) *wait = gc_th->max_sleep_time; } static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th, long *wait) { if (*wait == gc_th->no_gc_sleep_time) *wait = gc_th->max_sleep_time; *wait -= gc_th->min_sleep_time; if (*wait <= gc_th->min_sleep_time) *wait = gc_th->min_sleep_time; } static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi) { block_t invalid_user_blocks = sbi->user_block_count - written_block_count(sbi); /* * Background GC is triggered with the following conditions. * 1. There are a number of invalid blocks. * 2. There is not enough free space. */ if (invalid_user_blocks > limit_invalid_user_blocks(sbi) && free_user_blocks(sbi) < limit_free_user_blocks(sbi)) return true; return false; }
path: root/drivers/usb/gadget
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
commit39cb2c9a316e77f6dfba96c543e55b6672d5a37e (patch)
tree98fe974ee4e20121253de7f61fc8d01bdb3821c1 /drivers/usb/gadget
parent2c5d9555d6d937966d79d4c6529a5f7b9206e405 (diff)
drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb/gadget')