I'm seeing assert failures from xlog_space_left() after a shutdown
has begun that look like:
XFS (dm-0): log I/O error -5
XFS (dm-0): xfs_do_force_shutdown(0x2) called from line 1338 of file fs/xfs/xfs_log.c. Return address = xlog_ioend_work+0x64/0xc0
XFS (dm-0): Log I/O Error Detected.
XFS (dm-0): Shutting down filesystem. Please unmount the filesystem and rectify the problem(s)
XFS (dm-0): xlog_space_left: head behind tail
XFS (dm-0): tail_cycle = 6, tail_bytes = 2706944
XFS (dm-0): GH cycle = 6, GH bytes = 1633867
XFS: Assertion failed: 0, file: fs/xfs/xfs_log.c, line: 1310
------------[ cut here ]------------
Call Trace:
xlog_space_left+0xc3/0x110
xlog_grant_push_threshold+0x3f/0xf0
xlog_grant_push_ail+0x12/0x40
xfs_log_reserve+0xd2/0x270
? __might_sleep+0x4b/0x80
xfs_trans_reserve+0x18b/0x260
.....
There are two things here. Firstly, after a shutdown, the log head
and tail can be out of whack as things abort and release (or don't
release) resources, so checking them for sanity doesn't make much
sense. Secondly, xfs_log_reserve() can race with shutdown and so it
can still fail like this even though it has already checked for a
log shutdown before calling xlog_grant_push_ail().
So, before ASSERT failing in xlog_space_left(), make sure we haven't
already shut down....
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
When the log is shutdown, it currently walks all the iclogs and runs
callbacks that are attached to the iclogs, regardless of whether the
iclog is queued for IO completion or not. This creates a problem for
contexts attaching callbacks to iclogs in that a racing shutdown can
run the callbacks even before the attaching context has finished
processing the iclog and releasing it for IO submission.
If the callback processing of the iclog frees the structure that is
attached to the iclog, then this leads to an UAF scenario that can
only be protected against by holding the icloglock from the point
callbacks are attached through to the release of the iclog. While we
currently do this, it is not practical or sustainable.
Hence we need to make shutdown processing the responsibility of the
context that holds active references to the iclog. We know that the
contexts attaching callbacks to the iclog must have active
references to the iclog, and that means they must be in either
ACTIVE or WANT_SYNC states. xlog_state_do_callback() will skip over
iclogs in these states -except- when the log is shut down.
xlog_state_do_callback() checks the state of the iclogs while
holding the icloglock, therefore the reference count/state change
that occurs in xlog_state_release_iclog() after the callbacks are
atomic w.r.t. shutdown processing.
We can't push the responsibility of callback cleanup onto the CIL
context because we can have ACTIVE iclogs that have callbacks
attached that have already been released. Hence we really need to
internalise the cleanup of callbacks into xlog_state_release_iclog()
processing.
Indeed, we already have that internalisation via:
xlog_state_release_iclog
drop last reference
->SYNCING
xlog_sync
xlog_write_iclog
if (log_is_shutdown)
xlog_state_done_syncing()
xlog_state_do_callback()
<process shutdown on iclog that is now in SYNCING state>
The problem is that xlog_state_release_iclog() aborts before doing
anything if the log is already shut down. It assumes that the
callbacks have already been cleaned up, and it doesn't need to do
any cleanup.
Hence the fix is to remove the xlog_is_shutdown() check from
xlog_state_release_iclog() so that reference counts are correctly
released from the iclogs, and when the reference count is zero we
always transition to SYNCING if the log is shut down. Hence we'll
always enter the xlog_sync() path in a shutdown and eventually end
up erroring out the iclog IO and running xlog_state_do_callback() to
process the callbacks attached to the iclog.
This allows us to stop processing referenced ACTIVE/WANT_SYNC iclogs
directly in the shutdown code, and in doing so gets rid of the UAF
vector that currently exists. This then decouples the adding of
callbacks to the iclogs from xlog_state_release_iclog() as we
guarantee that xlog_state_release_iclog() will process the callbacks
if the log has been shut down before xlog_state_release_iclog() has
been called.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
The iclog callback processing done during a forced log shutdown has
different logic to normal runtime IO completion callback processing.
Separate out the shutdown callbacks into their own function and call
that from the shutdown code instead.
We don't need this shutdown specific logic in the normal runtime
completion code - we'll always run the shutdown version on shutdown,
and it will do what shutdown needs regardless of whether there are
racing IO completion callbacks scheduled or in progress. Hence we
can also simplify the normal IO completion callpath and only abort
if shutdown occurred while we actively were processing callbacks.
Further, separating out the IO completion logic from the shutdown
logic avoids callback race conditions from being triggered by log IO
completion after a shutdown. IO completion will now only run
callbacks on iclogs that are in the correct state for a callback to
be run, avoiding the possibility of running callbacks on a
referenced iclog that hasn't yet been submitted for IO.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Clean it up a bit by factoring and rearranging some of the code.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
The running of a forced shutdown is a bit of a mess. It does racy
checks for XFS_MOUNT_SHUTDOWN in xfs_do_force_shutdown(), then
does more racy checks in xfs_log_force_unmount() before finally
setting XFS_MOUNT_SHUTDOWN and XLOG_IO_ERROR under the
log->icloglock.
Move the checking and setting of XFS_MOUNT_SHUTDOWN into
xfs_do_force_shutdown() so we only process a shutdown once and once
only. Serialise this with the mp->m_sb_lock spinlock so that the
state change is atomic and won't race. Move all the mount specific
shutdown state changes from xfs_log_force_unmount() to
xfs_do_force_shutdown() so they are done atomically with setting
XFS_MOUNT_SHUTDOWN.
Then get rid of the racy xlog_is_shutdown() check from
xlog_force_shutdown(), and gate the log shutdown on the
test_and_set_bit(XLOG_IO_ERROR) test under the icloglock. This
means that the log is shutdown once and once only, and code that
needs to prevent races with shutdown can do so by holding the
icloglock and checking the return value of xlog_is_shutdown().
This results in a predictable shutdown execution process - we set the
shutdown flags once and process the shutdown once rather than the
current "as many concurrent shutdowns as can race to the flag
setting" situation we have now.
Also, now that shutdown is atomic, alway emit a stack trace when the
error level for the filesystem is high enough. This means that we
always get a stack trace when trying to diagnose the cause of
shutdowns in the field, rather than just for SHUTDOWN_CORRUPT_INCORE
cases.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
log->l_flags doesn't actually contain "flags" as such, it contains
operational state information that can change at runtime. For the
shutdown state, this at least should be an atomic bit because
it is read without holding locks in many places and so using atomic
bitops for the state field modifications makes sense.
This allows us to use things like test_and_set_bit() on state
changes (e.g. setting XLOG_TAIL_WARN) to avoid races in setting the
state when we aren't holding locks.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
xfs_log_mount_finish() needs to know if recovery is needed or not to
make decisions on whether to flush the log and AIL. Move the
handling of the NEED_RECOVERY state out to this function rather than
needing a temporary variable to store this state over the call to
xlog_recover_finish().
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
We don't need an iclog state field to tell us the log has been shut
down. We can just check the xlog_is_shutdown() instead. The avoids
the need to have shutdown overwrite the current iclog state while
being active used by the log code and so having to ensure that every
iclog state check handles XLOG_STATE_IOERROR appropriately.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Make it less shouty and a static inline before adding more calls
through the log code.
Also convert internal log code that uses XFS_FORCED_SHUTDOWN(mount)
to use xlog_is_shutdown(log) as well.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Now that the lightnvm driver is removed, we don't need a pointer to it's
now non-existent struct.
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Transport drivers need both core and fabrics modules, instead of
selecting both, have the selection transitive such that NVME_FABRICS
selects NVME_CORE and transport drivers select NVME_FABRICS.
Suggested-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
The Altera EDAC driver has several features conditionally built
depending on Kconfig options. The edac_device_prv_data structures
are conditionally used in of_device_id tables. They reference other
functions and structures which can be defined as __maybe_unused.
Silence build warnings like:
drivers/edac/altera_edac.c:643:37: warning:
‘altr_edac_device_inject_fops’ defined but not used [-Wunused-const-variable=]
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lkml.kernel.org/r/20210601092704.203555-1-krzysztof.kozlowski@canonical.com
The "latency" tracers have some different requirements than normal
tracing, and also includes Daniel as a maintainer. Add a section in the
MAINTAINERS file to help direct patches and bug reports to these tracers
to the right people.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
It is never read. Setting it and the request tag seems dodgy anyway.
Link: https://lore.kernel.org/r/1628862553-179450-3-git-send-email-john.garry@huawei.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Use scsi_cmd_to_rq(cmd)->tag instead.
Link: https://lore.kernel.org/r/1628862553-179450-2-git-send-email-john.garry@huawei.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This driver has some left over "return 1" on failure style code mixed with
"return negative error codes" style code. The caller doesn't care so we
should just convert everything to return negative error codes.
Then there was a problem that there were two variables used to store error
codes which just resulted in confusion. If qedf_alloc_bdq() returned a
negative error code, we accidentally returned success instead of
propagating the error code. So get rid of the "rc" variable and use
"status" every where.
Also remove the "status = 0" initialization so that these sorts of bugs
will be detected by the compiler in the future.
Link: https://lore.kernel.org/r/20210810085023.GA23998@kili
Fixes: 61d8658b4a ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Acked-by: Manish Rangankar <mrangankar@marvell.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This function had some left over code that returned 1 on error instead
negative error codes. Convert everything to use negative error codes. The
caller treats all non-zero returns the same so this does not affect run
time.
A couple places set "rc" instead of "status" so those error paths ended up
returning success by mistake. Get rid of the "rc" variable and use
"status" everywhere.
Remove the bogus "status = 0" initialization, as a future proofing measure
so the compiler will warn about uninitialized error codes.
Link: https://lore.kernel.org/r/20210810084753.GD23810@kili
Fixes: ace7f46ba5 ("scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.")
Acked-by: Manish Rangankar <mrangankar@marvell.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Return -EINVAL on failure instead of success.
Link: https://lore.kernel.org/r/20210810084613.GB23810@kili
Fixes: a91aaae024 ("scsi: smartpqi: allow for larger raid maps")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Include RANDOM_TRUST_CPU and RANDOM_TRUST_BOOTLOADER inside the
"Character devices" menu so that they are listed (presented)
with other Character devices.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210816000531.17934-1-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There is a spelling mistake in a dev_dbg debug message. Fix it.
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210815214206.47970-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the obsolete and ambiguos macro in_irq() with new
macro in_hardirq().
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Link: https://lore.kernel.org/r/20210814005033.2381-1-changbin.du@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to request_threaded_irq() (which
takes *unsigned* IRQ #), causing it to fail with -EINVAL, overriding an
original error code. Stop calling request_threaded_irq() with the invalid
IRQ #s.
Fixes: 9ba96ae507 ("usb: omap1: Tahvo USB transceiver driver")
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/8280d6a4-8e9a-7cfe-1aa9-db586dc9afdf@omp.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to usb_add_hcd() (which takes
*unsigned* IRQ #), causing request_irq() that it calls to fail with
-EINVAL, overriding an original error code. Stop calling usb_add_hcd()
with the invalid IRQ #s.
Fixes: 78c73414f4 ("USB: ohci: add support for tmio-ohci cell")
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/402e1a45-a0a4-0e08-566a-7ca1331506b1@omp.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Syzbot hit WARNING in internal_create_group(). The problem was in
too big disk->first_minor.
disk->first_minor is initialized by value, which comes from userspace
and there wasn't any sanity checks about value correctness. It can cause
duplicate creation of sysfs files/links, because disk->first_minor will
be passed to MKDEV() which causes truncation to byte. Since maximum
minor value is 0xff, let's check if first_minor is correct minor number.
NOTE: the root case of the reported warning was in wrong error handling
in register_disk(), but we can avoid passing knowingly wrong values to
sysfs API, because sysfs error messages can confuse users. For example:
user passed 1048576 as index, but sysfs complains about duplicate
creation of /dev/block/43:0. It's not obvious how 1048576 becomes 0.
Log and reproducer for above example can be found on syzkaller bug
report page.
Link: https://syzkaller.appspot.com/bug?id=03c2ae9146416edf811958d5fd7acfab75b143d1
Fixes: b0d9111a2d ("nbd: use an idr to keep track of nbd devices")
Reported-by: syzbot+9937dc42271cd87d4b98@syzkaller.appspotmail.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This now has no more users, remove it.
Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Invoking atomic_notifier_chain_notify() requires acquiring a spinlock_t,
which can block under CONFIG_PREEMPT_RT. Notifications for members of the
cpu_pm notification chain will be issued by the idle task, which can never
block.
Making *all* atomic_notifiers use a raw_spinlock is too big of a hammer, as
only notifications issued by the idle task are problematic.
Special-case cpu_pm_notifier_chain by kludging a raw_notifier and
raw_spinlock_t together, matching the atomic_notifier behavior with a
raw_spinlock_t.
Fixes: 70d9329857 ("notifier: Fix broken error handling pattern")
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This fixes two issues that cause the sysrq sequence to be inadvertently
aborted on SCIF serial consoles:
- a NUL character remains in the RX queue after a break has been detected,
which is then passed on to uart_handle_sysrq_char()
- the break interrupt is handled twice on controllers with multiplexed ERI
and BRI interrupts
Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20210816162201.28801-1-uli+renesas@fpond.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
seq_get_buf is a crutch that undoes all the memory safety of the
seq_file interface. Use the normal seq_printf interfaces instead.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20210810152623.1796144-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Factor out a helper to deal with a single blkcg_gq to make the code a
little bit easier to follow.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20210810152623.1796144-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use the defined variable 'dev' to make the code cleaner.
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20210814124951.30084-1-tangbin@cmss.chinamobile.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This reverts commit b0819465be which
results in amba_device-specific code being called from
sbsa_uart_startup() and sbsa_uart_shutdown().
Signed-off-by: Qian Cai <quic_qiancai@quicinc.com>
Link: https://lore.kernel.org/r/20210813163135.205-1-quic_qiancai@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use bvec_virt instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20210804095634.460779-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use bvec_virt instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Link: https://lore.kernel.org/r/20210804095634.460779-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use bvec_virt instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210804095634.460779-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use bvec_virt instead of open coding it. Note that the existing code is
fine despite ignoring bv_offset as the bio is known to contain exactly
one page from the page allocator per bio_vec.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20210804095634.460779-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use bvec_virt instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20210804095634.460779-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use bvec_virt instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20210804095634.460779-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
__ebs_rw_bvec use page_address on the submitted bios data, and thus
can't deal with highmem. Disable the target on highmem configs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210804095634.460779-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use the bvec_virt helper to clean up the bio integrity processing a
little bit.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@kernel.org>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210804095634.460779-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Add a helper to get the virtual address for a bvec. This avoids that
all callers need to know about the page + offset representation.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210804095634.460779-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Fix kernel-doc warnings in kernel/power/main.c by unmarking the
comment block as kernel-doc notation. This eliminates the following
kernel-doc warnings:
kernel/power/main.c:593: warning: expecting prototype for state(). Prototype was for state_show() instead
kernel/power/main.c:593: warning: Function parameter or member 'kobj' not described in 'state_show'
kernel/power/main.c:593: warning: Function parameter or member 'attr' not described in 'state_show'
kernel/power/main.c:593: warning: Function parameter or member 'buf' not described in 'state_show'
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
