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  1. 23 5月, 2018 3 次提交
  3. 21 5月, 2018 4 次提交
  5. 20 5月, 2018 3 次提交
  7. 19 5月, 2018 1 次提交
  9. 18 5月, 2018 18 次提交
  11. 17 5月, 2018 4 次提交
  13. 16 5月, 2018 2 次提交
    • W
      locking/percpu-rwsem: Annotate rwsem ownership transfer by setting RWSEM_OWNER_UNKNOWN · 5a817641
      由 Waiman Long 提交于 
      The filesystem freezing code needs to transfer ownership of a rwsem
embedded in a percpu-rwsem from the task that does the freezing to
another one that does the thawing by calling percpu_rwsem_release()
after freezing and percpu_rwsem_acquire() before thawing.

However, the new rwsem debug code runs afoul with this scheme by warning
that the task that releases the rwsem isn't the one that acquires it,
as reported by Amir Goldstein:

  DEBUG_LOCKS_WARN_ON(sem->owner != get_current())
  WARNING: CPU: 1 PID: 1401 at /home/amir/build/src/linux/kernel/locking/rwsem.c:133 up_write+0x59/0x79

  Call Trace:
   percpu_up_write+0x1f/0x28
   thaw_super_locked+0xdf/0x120
   do_vfs_ioctl+0x270/0x5f1
   ksys_ioctl+0x52/0x71
   __x64_sys_ioctl+0x16/0x19
   do_syscall_64+0x5d/0x167
   entry_SYSCALL_64_after_hwframe+0x49/0xbe

To work properly with the rwsem debug code, we need to annotate that the
rwsem ownership is unknown during the tranfer period until a brave soul
comes forward to acquire the ownership. During that period, optimistic
spinning will be disabled.
Reported-by: NAmir Goldstein <amir73il@gmail.com>
Tested-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jan Kara <jack@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Theodore Y. Ts'o <tytso@mit.edu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-fsdevel@vger.kernel.org
Link: http://lkml.kernel.org/r/1526420991-21213-3-git-send-email-longman@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      5a817641
    • J
      bpf: sockmap, add hash map support · 81110384
      由 John Fastabend 提交于 
      Sockmap is currently backed by an array and enforces keys to be
four bytes. This works well for many use cases and was originally
modeled after devmap which also uses four bytes keys. However,
this has become limiting in larger use cases where a hash would
be more appropriate. For example users may want to use the 5-tuple
of the socket as the lookup key.

To support this add hash support.
Signed-off-by: NJohn Fastabend <john.fastabend@gmail.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
      81110384
  15. 15 5月, 2018 5 次提交
    • J
      bpf: sockmap, refactor sockmap routines to work with hashmap · e5cd3abc
      由 John Fastabend 提交于 
      This patch only refactors the existing sockmap code. This will allow
much of the psock initialization code path and bpf helper codes to
work for both sockmap bpf map types that are backed by an array, the
currently supported type, and the new hash backed bpf map type
sockhash.

Most the fallout comes from three changes,

  - Pushing bpf programs into an independent structure so we
    can use it from the htab struct in the next patch.
  - Generalizing helpers to use void *key instead of the hardcoded
    u32.
  - Instead of passing map/key through the metadata we now do
    the lookup inline. This avoids storing the key in the metadata
    which will be useful when keys can be longer than 4 bytes. We
    rename the sk pointers to sk_redir at this point as well to
    avoid any confusion between the current sk pointer and the
    redirect pointer sk_redir.
Signed-off-by: NJohn Fastabend <john.fastabend@gmail.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
      e5cd3abc
    • G
      mtd: rawnand: Fix return type of __DIVIDE() when called with 32-bit · 9f825e74
      由 Geert Uytterhoeven 提交于 
      The __DIVIDE() macro checks whether it is called with a 32-bit or 64-bit
dividend, to select the appropriate divide-and-round-up routine.
As the check uses the ternary operator, the result will always be
promoted to a type that can hold both results, i.e. unsigned long long.

When using this result in a division on a 32-bit system, this may lead
to link errors like:

    ERROR: "__udivdi3" [drivers/mtd/nand/raw/nand.ko] undefined!

Fix this by casting the result of the division to the type of the
dividend.

Fixes: 8878b126 ("mtd: nand: add ->exec_op() implementation")
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>
      9f825e74
    • S
      tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all} · 45dd9b06
      由 Steven Rostedt (VMware) 提交于 
      Doing an audit of trace events, I discovered two trace events in the xen
subsystem that use a hack to create zero data size trace events. This is not
what trace events are for. Trace events add memory footprint overhead, and
if all you need to do is see if a function is hit or not, simply make that
function noinline and use function tracer filtering.

Worse yet, the hack used was:

 __array(char, x, 0)

Which creates a static string of zero in length. There's assumptions about
such constructs in ftrace that this is a dynamic string that is nul
terminated. This is not the case with these tracepoints and can cause
problems in various parts of ftrace.

Nuke the trace events!

Link: http://lkml.kernel.org/r/20180509144605.5a220327@gandalf.local.home

Cc: stable@vger.kernel.org
Fixes: 95a7d768 ("xen/mmu: Use Xen specific TLB flush instead of the generic one.")
Reviewed-by: NJuergen Gross <jgross@suse.com>
Signed-off-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
      45dd9b06
    • M
      sched: cls: enable verbose logging · 81c7288b
      由 Marcelo Ricardo Leitner 提交于 
      Currently, when the rule is not to be exclusively executed by the
hardware, extack is not passed along and offloading failures don't
get logged. The idea was that hardware failures are okay because the
rule will get executed in software then and this way it doesn't confuse
unware users.

But this is not helpful in case one needs to understand why a certain
rule failed to get offloaded. Considering it may have been a temporary
failure, like resources exceeded or so, reproducing it later and knowing
that it is triggering the same reason may be challenging.

The ultimate goal is to improve Open vSwitch debuggability when using
flower offloading.

This patch adds a new flag to enable verbose logging. With the flag set,
extack will be passed to the driver, which will be able to log the
error. As the operation itself probably won't fail (not because of this,
at least), current iproute will already log it as a Warning.

The flag is generic, so it can be reused later. No need to restrict it
just for HW offloading. The command line will follow the syntax that
tc-ebpf already uses, tc ... [ verbose ] ... , and extend its meaning.

For example:
# ./tc qdisc add dev p7p1 ingress
# ./tc filter add dev p7p1 parent ffff: protocol ip prio 1 \
	flower verbose \
	src_mac ed:13:db:00:00:00 dst_mac 01:80:c2:00:00:d0 \
	src_ip 56.0.0.0 dst_ip 55.0.0.0 action drop
Warning: TC offload is disabled on net device.
# echo $?
0
# ./tc filter add dev p7p1 parent ffff: protocol ip prio 1 \
	flower \
	src_mac ff:13:db:00:00:00 dst_mac 01:80:c2:00:00:d0 \
	src_ip 56.0.0.0 dst_ip 55.0.0.0 action drop
# echo $?
0
Signed-off-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      81c7288b
    • R
      vmcore: add API to collect hardware dump in second kernel · 2724273e
      由 Rahul Lakkireddy 提交于 
      The sequence of actions done by device drivers to append their device
specific hardware/firmware logs to /proc/vmcore are as follows:

1. During probe (before hardware is initialized), device drivers
register to the vmcore module (via vmcore_add_device_dump()), with
callback function, along with buffer size and log name needed for
firmware/hardware log collection.

2. vmcore module allocates the buffer with requested size. It adds
an Elf note and invokes the device driver's registered callback
function.

3. Device driver collects all hardware/firmware logs into the buffer
and returns control back to vmcore module.

Ensure that the device dump buffer size is always aligned to page size
so that it can be mmaped.

Also, rename alloc_elfnotes_buf() to vmcore_alloc_buf() to make it more
generic and reserve NT_VMCOREDD note type to indicate vmcore device
dump.

Suggested-by: Eric Biederman <ebiederm@xmission.com>.
Signed-off-by: NRahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: NGanesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      2724273e