- 10 9月, 2011 3 次提交
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由 Theodore Ts'o 提交于
At least initially if the bigalloc feature is enabled, we will not support non-extent mapped inodes, online resizing, online defrag, or the FITRIM ioctl. This simplifies the initial implementation. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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由 Theodore Ts'o 提交于
This adds supports for bigalloc file systems. It teaches the mount code just enough about bigalloc superblock fields that it will mount the file system without freaking out that the number of blocks per group is too big. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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由 Theodore Ts'o 提交于
The del_gendisk() function uninitializes the disk-specific data structures, including the bdi structure, without telling anyone else. Once this happens, any attempt to call mark_buffer_dirty() (for example, by ext4_commit_super), will cause a kernel OOPS. Fix this for now until we can fix things in an architecturally correct way. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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- 07 9月, 2011 2 次提交
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由 Allison Henderson 提交于
While running extended fsx tests to verify the preceeding patches, a similar bug was also found in the write operation When ever a write operation begins or ends in a hole, or extends EOF, the partial page contained in the hole or beyond EOF needs to be zeroed out. To correct this the new ext4_discard_partial_page_buffers_no_lock routine is used to zero out the partial page, but only for buffer heads that are already unmapped. Signed-off-by: NAllison Henderson <achender@linux.vnet.ibm.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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由 Allison Henderson 提交于
While running extended fsx tests to verify the first two patches, a similar bug was also found in the truncate operation. This bug happens because the truncate routine only zeros the unblock aligned portion of the last page. This means that the block aligned portions of the page appearing after i_size are left unzeroed, and the buffer heads still mapped. This bug is corrected by using ext4_discard_partial_page_buffers in the truncate routine to zero the partial page and unmap the buffer headers. Signed-off-by: NAllison Henderson <achender@linux.vnet.ibm.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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- 06 9月, 2011 1 次提交
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由 Theodore Ts'o 提交于
In delayed allocation mode, it's important to only call ext4_jbd2_file_inode when the file has been extended. This is necessary to avoid a race which first got introduced in commit 678aaf48, but which was made much more common with the introduction of the "punch hole" functionality. (Especially when dioread_nolock was enabled; when I could reliably reproduce this problem with xfstests #74.) The race is this: If while trying to writeback a delayed allocation inode, there is a need to map delalloc blocks, and we run out of space in the journal, *and* at the same time the inode is already on the committing transaction's t_inode_list (because for example while doing the punch hole operation, ext4_jbd2_file_inode() is called), then the commit operation will wait for the inode to finish all of its pending writebacks by calling filemap_fdatawait(), but since that inode has one or more pages with the PageWriteback flag set, the commit operation will wait forever, and the so the writeback of the inode can never take place, and the kjournald thread and the writeback thread end up waiting for each other --- forever. It's important at this point to recall why an inode is placed on the t_inode_list; it is to provide the data=ordered guarantees that we don't end up exposing stale data. In the case where we are truncating or punching a hole in the inode, there is no possibility that stale data could be exposed in the first place, so we don't need to put the inode on the t_inode_list! The right long-term fix is to get rid of data=ordered mode altogether, and only update the extent tree or indirect blocks after the data has been written. Until then, this change will also avoid some unnecessary waiting in the commit operation. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: Allison Henderson <achender@linux.vnet.ibm.com> Cc: Jan Kara <jack@suse.cz>
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- 04 9月, 2011 3 次提交
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由 Dan Carpenter 提交于
This silences some Sparse warnings: fs/jbd2/transaction.c:135:69: warning: incorrect type in argument 2 (different base types) fs/jbd2/transaction.c:135:69: expected restricted gfp_t [usertype] flags fs/jbd2/transaction.c:135:69: got int [signed] gfp_mask Signed-off-by: NDan Carpenter <error27@gmail.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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由 Theodore Ts'o 提交于
Add debugging information in case jbd2_journal_dirty_metadata() is called with a buffer_head which didn't have jbd2_journal_get_write_access() called on it, or if the journal_head has the wrong transaction in it. In addition, return an error code. This won't change anything for ocfs2, which will BUG_ON() the non-zero exit code. For ext4, the caller of this function is ext4_handle_dirty_metadata(), and on seeing a non-zero return code, will call __ext4_journal_stop(), which will print the function and line number of the (buggy) calling function and abort the journal. This will allow us to recover instead of bug halting, which is better from a robustness and reliability point of view. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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由 Theodore Ts'o 提交于
If the user explicitly specifies conflicting mount options for delalloc or dioread_nolock and data=journal, fail the mount, instead of printing a warning and continuing (since many user's won't look at dmesg and notice the warning). Also, print a single warning that data=journal implies that delayed allocation is not on by default (since it's not supported), and furthermore that O_DIRECT is not supported. Improve the text in Documentation/filesystems/ext4.txt so this is clear there as well. Similarly, if the dioread_nolock mount option is specified when the file system block size != PAGE_SIZE, fail the mount instead of printing a warning message and ignoring the mount option. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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- 03 9月, 2011 3 次提交
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由 Allison Henderson 提交于
This patch fixes a second punch hole bug found by xfstests 127. This bug happens because punch hole needs to flush the pages of the hole to avoid race conditions. But if the end of the hole is in the same page as i_size, the buffer heads beyond i_size need to be unmapped and the page needs to be zeroed after it is flushed. To correct this, the new ext4_discard_partial_page_buffers routine is used to zero and unmap the partial page beyond i_size if the end of the hole appears in the same page as i_size. The code has also been optimized to set the end of the hole to the page after i_size if the specified hole exceeds i_size, and the code that flushes the pages has been simplified. Signed-off-by: NAllison Henderson <achender@linux.vnet.ibm.com>
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由 Allison Henderson 提交于
This patch addresses a bug found by xfstests 75, 112, 127 when blocksize = 1k This bug happens because the punch hole code only zeros out non block aligned regions of the page. This means that if the blocks are smaller than a page, then the block aligned regions of the page inside the hole are left un-zeroed, and their buffer heads are still mapped. This bug is corrected by using ext4_discard_partial_page_buffers to properly zero the partial page at the head and tail of the hole, and unmap the corresponding buffer heads This patch also addresses a bug reported by Lukas while working on a new patch to add discard support for loop devices using punch hole. The bug happened because of the first and last block number needed to be cast to a larger data type before calculating the byte offset, but since now we only need the byte offsets of the pages, we no longer even need to be calculating the byte offsets of the blocks. The code to do the block offset calculations is removed in this patch. Signed-off-by: NAllison Henderson <achender@linux.vnet.ibm.com>
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由 Allison Henderson 提交于
This patch adds two new routines: ext4_discard_partial_page_buffers and ext4_discard_partial_page_buffers_no_lock. The ext4_discard_partial_page_buffers routine is a wrapper function to ext4_discard_partial_page_buffers_no_lock. The wrapper function locks the page and passes it to ext4_discard_partial_page_buffers_no_lock. Calling functions that already have the page locked can call ext4_discard_partial_page_buffers_no_lock directly. The ext4_discard_partial_page_buffers_no_lock function zeros a specified range in a page, and unmaps the corresponding buffer heads. Only block aligned regions of the page will have their buffer heads unmapped. Unblock aligned regions will be mapped if needed so that they can be updated with the partial zero out. This function is meant to be used to update a page and its buffer heads to be zeroed and unmapped when the corresponding blocks have been released or will be released. This routine is used in the following scenarios: * A hole is punched and the non page aligned regions of the head and tail of the hole need to be discarded * The file is truncated and the partial page beyond EOF needs to be discarded * The end of a hole is in the same page as EOF. After the page is flushed, the partial page beyond EOF needs to be discarded. * A write operation begins or ends inside a hole and the partial page appearing before or after the write needs to be discarded * A write operation extends EOF and the partial page beyond EOF needs to be discarded This function takes a flag EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED which is used when a write operation begins or ends in a hole. When the EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED flag is used, only buffer heads that are already unmapped will have the corresponding regions of the page zeroed. Signed-off-by: NAllison Henderson <achender@linux.vnet.ibm.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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- 01 9月, 2011 2 次提交
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由 Theodore Ts'o 提交于
ext4_dx_add_entry manipulates bh2 and frames[0].bh, which are two buffer_heads that point to directory blocks assigned to the directory inode. However, the function calls ext4_handle_dirty_metadata with the inode of the file that's being added to the directory, not the directory inode itself. Therefore, correct the code to dirty the directory buffers with the directory inode, not the file inode. Signed-off-by: NDarrick J. Wong <djwong@us.ibm.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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由 Darrick J. Wong 提交于
ext4_mkdir calls ext4_handle_dirty_metadata with dir_block and the inode "dir". Unfortunately, dir_block belongs to the newly created directory (which is "inode"), not the parent directory (which is "dir"). Fix the incorrect association. Signed-off-by: NDarrick J. Wong <djwong@us.ibm.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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- 31 8月, 2011 4 次提交
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由 Darrick J. Wong 提交于
When ext4_rename performs a directory rename (move), dir_bh is a buffer that is modified to update the '..' link in the directory being moved (old_inode). However, ext4_handle_dirty_metadata is called with the old parent directory inode (old_dir) and dir_bh, which is incorrect because dir_bh does not belong to the parent inode. Fix this error. Signed-off-by: NDarrick J. Wong <djwong@us.ibm.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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由 Theodore Ts'o 提交于
Currently attempts to open a file with O_DIRECT in data=journal mode causes the open to fail with -EINVAL. This makes it very hard to test data=journal mode. So we will let the open succeed, but then always fall back to O_DSYNC buffered writes. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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由 Theodore Ts'o 提交于
This doesn't make much sense, and it exposes a bug in the kernel where attempts to create a new file in an append-only directory using O_CREAT will fail (but still leave a zero-length file). This was discovered when xfstests #79 was generalized so it could run on all file systems. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc:stable@kernel.org
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由 Jiaying Zhang 提交于
The i_mutex lock and flush_completed_IO() added by commit 2581fdc8 in ext4_evict_inode() causes lockdep complaining about potential deadlock in several places. In most/all of these LOCKDEP complaints it looks like it's a false positive, since many of the potential circular locking cases can't take place by the time the ext4_evict_inode() is called; but since at the very least it may mask real problems, we need to address this. This change removes the flush_completed_IO() and i_mutex lock in ext4_evict_inode(). Instead, we take a different approach to resolve the software lockup that commit 2581fdc8 intends to fix. Rather than having ext4-dio-unwritten thread wait for grabing the i_mutex lock of an inode, we use mutex_trylock() instead, and simply requeue the work item if we fail to grab the inode's i_mutex lock. This should speed up work queue processing in general and also prevents the following deadlock scenario: During page fault, shrink_icache_memory is called that in turn evicts another inode B. Inode B has some pending io_end work so it calls ext4_ioend_wait() that waits for inode B's i_ioend_count to become zero. However, inode B's ioend work was queued behind some of inode A's ioend work on the same cpu's ext4-dio-unwritten workqueue. As the ext4-dio-unwritten thread on that cpu is processing inode A's ioend work, it tries to grab inode A's i_mutex lock. Since the i_mutex lock of inode A is still hold before the page fault happened, we enter a deadlock. Signed-off-by: NJiaying Zhang <jiayingz@google.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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- 23 8月, 2011 3 次提交
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由 Linus Torvalds 提交于
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由 Linus Torvalds 提交于
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: perf tools: Add group event scheduling option to perf record/stat MAINTAINERS: Fix list of perf events source files perf tools: Fix build against newer glibc perf tools: Fix error handling of unknown events perf evlist: Fix missing event name init for default event perf list: Fix exit value
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git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen由 Linus Torvalds 提交于
* 'stable/bug.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/tracing: Fix tracing config option properly xen: Do not enable PV IPIs when vector callback not present xen/x86: replace order-based range checking of M2P table by linear one xen: xen-selfballoon.c needs more header files
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- 22 8月, 2011 3 次提交
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由 Jeremy Fitzhardinge 提交于
Steven Rostedt says we should use CONFIG_EVENT_TRACING. Cc:Steven Rostedt <rostedt@goodmis.org> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 Stefano Stabellini 提交于
Fix regression for HVM case on older (<4.1.1) hypervisors caused by commit 99bbb3a8 Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Date: Thu Dec 2 17:55:10 2010 +0000 xen: PV on HVM: support PV spinlocks and IPIs This change replaced the SMP operations with event based handlers without taking into account that this only works when the hypervisor supports callback vectors. This causes unexplainable hangs early on boot for HVM guests with more than one CPU. BugLink: http://bugs.launchpad.net/bugs/791850 CC: stable@kernel.org Signed-off-by: NStefan Bader <stefan.bader@canonical.com> Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Tested-and-Reported-by: NStefan Bader <stefan.bader@canonical.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6由 Linus Torvalds 提交于
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: firewire: core: handle ack_busy when fetching the Config ROM
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- 21 8月, 2011 4 次提交
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由 Josef Bacik 提交于
This fixes a regression introduced by commit cdcb725c ("Btrfs: check if there is enough space for balancing smarter"). We can't do 64-bit divides on 32-bit architectures. In cases where we need to divide/multiply by 2 we should just left/right shift respectively, and in cases where theres N number of devices use do_div. Also make the counters u64 to match up with rw_devices. Thanks, Signed-off-by: NJosef Bacik <josef@redhat.com> Acked-and-tested-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4由 Linus Torvalds 提交于
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: flush any pending end_io requests before DIO reads w/dioread_nolock ext4: fix nomblk_io_submit option so it correctly converts uninit blocks ext4: Resolve the hang of direct i/o read in handling EXT4_IO_END_UNWRITTEN. ext4: call ext4_ioend_wait and ext4_flush_completed_IO in ext4_evict_inode ext4: Fix ext4_should_writeback_data() for no-journal mode
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6由 Linus Torvalds 提交于
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: ALSA: sound/aoa/fabrics/layout.c: remove unneeded kfree ALSA: hda - Fix error check from snd_hda_get_conn_index() in patch_cirrus.c ALSA: hda - Don't spew too many ELD errors ALSA: usb-audio - Fix missing mixer dB information ALSA: hda - Add "PCM" volume to vmaster slave list ALSA: hda - Fix duplicated capture-volume creation for ALC268 models ALSA: ac97: Add HP Compaq dc5100 SFF(PT003AW) to Headphone Jack Sense whitelist ALSA: snd_usb_caiaq: track submitted output urbs
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由 Randy Dunlap 提交于
Fix new kernel-doc warning in pci.c: Warning(drivers/pci/pci.c:3259): No description found for parameter 'mps' Warning(drivers/pci/pci.c:3259): Excess function parameter 'rq' description in 'pcie_set_mps' Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 8月, 2011 8 次提交
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由 Julia Lawall 提交于
The label outnodev is only used when kzalloc has not yet taken place or has failed, so there is no need for the call for kfree under this label. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier x; expression E1!=0,E2,E3,E4; statement S; iterator I; @@ ( if (...) { ... when != kfree(x) when != x = E3 when != E3 = x * return ...; } ... when != x = E2 when != I(...,x,...) S if (...) { ... when != x = E4 kfree(x); ... return ...; } ) // </smpl> Signed-off-by: NJulia Lawall <julia@diku.dk> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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由 Takashi Iwai 提交于
snd_hda_get_conn_index() returns a negative value while the current code stores it in an unsigned int. It must be stored in a signed integer. Reported-by: NJesper Juhl <jj@chaosbits.net> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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由 Takashi Iwai 提交于
Currently HD-audio driver shows the all error ELD byte as an error in the kernel message. This is annoying when the video driver doesn't set the correct ELD from the beginning. e.g. radeon sends a zero-byte data, but we still check ELD with the fixed 128 byte as a workaround for some broken devices, it spews 128-times errors. For avoiding this, the driver aborts reading when the first byte is invalid. In such a case, the whole data is certainly invalid. Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/drm-intel由 Linus Torvalds 提交于
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/drm-intel: drm/i915: set GFX_MODE to pre-Ivybridge default value even on Ivybridge
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由 Jiaying Zhang 提交于
There is a race between ext4 buffer write and direct_IO read with dioread_nolock mount option enabled. The problem is that we clear PageWriteback flag during end_io time but will do uninitialized-to-initialized extent conversion later with dioread_nolock. If an O_direct read request comes in during this period, ext4 will return zero instead of the recently written data. This patch checks whether there are any pending uninitialized-to-initialized extent conversion requests before doing O_direct read to close the race. Note that this is just a bandaid fix. The fundamental issue is that we clear PageWriteback flag before we really complete an IO, which is problem-prone. To fix the fundamental issue, we may need to implement an extent tree cache that we can use to look up pending to-be-converted extents. Signed-off-by: NJiaying Zhang <jiayingz@google.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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由 Jesse Barnes 提交于
Prior to Ivybridge, the GFX_MODE would default to 0x800, meaning that MI_FLUSH would flush the TLBs in addition to the rest of the caches indicated in the MI_FLUSH command. However starting with Ivybridge, the register defaults to 0x2800 out of reset, meaning that to invalidate the TLB we need to use PIPE_CONTROL. Since we're not doing that yet, go back to the old default so things work. v2: don't forget to actually *clear* the new bit Reviewed-by: NEric Anholt <eric@anholt.net> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Tested-by: NKenneth Graunke <kenneth@whitecape.org> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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git://git.kernel.dk/linux-block由 Linus Torvalds 提交于
* 'for-linus' of git://git.kernel.dk/linux-block: (23 commits) Revert "cfq: Remove special treatment for metadata rqs." block: fix flush machinery for stacking drivers with differring flush flags block: improve rq_affinity placement blktrace: add FLUSH/FUA support Move some REQ flags to the common bio/request area allow blk_flush_policy to return REQ_FSEQ_DATA independent of *FLUSH xen/blkback: Make description more obvious. cfq-iosched: Add documentation about idling block: Make rq_affinity = 1 work as expected block: swim3: fix unterminated of_device_id table block/genhd.c: remove useless cast in diskstats_show() drivers/cdrom/cdrom.c: relax check on dvd manufacturer value drivers/block/drbd/drbd_nl.c: use bitmap_parse instead of __bitmap_parse bsg-lib: add module.h include cfq-iosched: Reduce linked group count upon group destruction blk-throttle: correctly determine sync bio loop: fix deadlock when sysfs and LOOP_CLR_FD race against each other loop: add BLK_DEV_LOOP_MIN_COUNT=%i to allow distros 0 pre-allocated loop devices loop: add management interface for on-demand device allocation loop: replace linked list of allocated devices with an idr index ...
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git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6由 Linus Torvalds 提交于
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: PCI: OF: Don't crash when bridge parent is NULL. PCI: export pcie_bus_configure_settings symbol PCI: code and comments cleanup PCI: make cardbus-bridge resources optional PCI: make SRIOV resources optional PCI : ability to relocate assigned pci-resources PCI: honor child buses add_size in hot plug configuration PCI: Set PCI-E Max Payload Size on fabric
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- 19 8月, 2011 4 次提交
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由 David Daney 提交于
In pcibios_get_phb_of_node(), we will crash while booting if bus->bridge->parent is NULL. Check for this case and avoid dereferencing the NULL pointer. Signed-off-by: NDavid Daney <david.daney@cavium.com> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: NGrant Likely <grant.likely@secretlab.ca> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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由 Jens Axboe 提交于
We have a kernel build regression since 3.1-rc1, which is about 10% regression. The kernel source is in an ext3 filesystem. Alex Shi bisect it to commit: commit a07405b7 Author: Justin TerAvest <teravest@google.com> Date: Sun Jul 10 22:09:19 2011 +0200 cfq: Remove special treatment for metadata rqs. Apparently this is caused by lack metadata preemption, where ext3/ext4 do use READ_META. I didn't see a way to fix the issue, so suggest reverting the patch. This reverts commit a07405b7. Reported-by: Alex Shi<alex.shi@intel.com> Reported-by: Shaohua Li<shaohua.li@intel.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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由 Takashi Iwai 提交于
The recent fix for testing dB range at the mixer creation time seems to cause regressions in some devices. In such devices, reading the dB info at probing time gives an error, thus both dBmin and dBmax are still zero, and TLV flag isn't set although the later read of dB info succeeds. This patch adds a workaround for such a case by assuming that the later read will succeed. In future, a similar test should be performed in a case where a wrong dB range is seen even in the later read. Signed-off-by: NTakashi Iwai <tiwai@suse.de> Cc: <stable@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc由 Linus Torvalds 提交于
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: sparc: fix array bounds error setting up PCIC NMI trap
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