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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

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Pull virtio barrier rework+fixes from Michael Tsirkin:
 "This adds a new kind of barrier, and reworks virtio and xen to use it.

  Plus some fixes here and there"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (44 commits)
  checkpatch: add virt barriers
  checkpatch: check for __smp outside barrier.h
  checkpatch.pl: add missing memory barriers
  virtio: make find_vqs() checkpatch.pl-friendly
  virtio_balloon: fix race between migration and ballooning
  virtio_balloon: fix race by fill and leak
  s390: more efficient smp barriers
  s390: use generic memory barriers
  xen/events: use virt_xxx barriers
  xen/io: use virt_xxx barriers
  xenbus: use virt_xxx barriers
  virtio_ring: use virt_store_mb
  sh: move xchg_cmpxchg to a header by itself
  sh: support 1 and 2 byte xchg
  virtio_ring: update weak barriers to use virt_xxx
  Revert "virtio_ring: Update weak barriers to use dma_wmb/rmb"
  asm-generic: implement virt_xxx memory barriers
  x86: define __smp_xxx
  xtensa: define __smp_xxx
  tile: define __smp_xxx
  ...
This commit is contained in:
Linus Torvalds
2016-01-18 16:44:24 -08:00
parent d05d82f711 43e361f23c
commit a200dcb346
44 changed files with 400 additions and 318 deletions
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33
scripts/checkpatch.pl
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@@ -5116,13 +5116,44 @@ sub process {
}
}
# check for memory barriers without a comment.
if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
my $barriers = qr{
mb|
rmb|
wmb|
read_barrier_depends
}x;
my $barrier_stems = qr{
mb__before_atomic|
mb__after_atomic|
store_release|
load_acquire|
store_mb|
(?:$barriers)
}x;
my $all_barriers = qr{
(?:$barriers)|
smp_(?:$barrier_stems)|
virt_(?:$barrier_stems)
}x;
if ($line =~ /\b(?:$all_barriers)\s*\(/) {
if (!ctx_has_comment($first_line, $linenr)) {
WARN("MEMORY_BARRIER",
"memory barrier without comment\n" . $herecurr);
}
}
my $underscore_smp_barriers = qr{__smp_(?:$barrier_stems)}x;
if ($realfile !~ m@^include/asm-generic/@ &&
$realfile !~ m@/barrier\.h$@ &&
$line =~ m/\b(?:$underscore_smp_barriers)\s*\(/ &&
$line !~ m/^.\s*\#\s*define\s+(?:$underscore_smp_barriers)\s*\(/) {
WARN("MEMORY_BARRIER",
"__smp memory barriers shouldn't be used outside barrier.h and asm-generic\n" . $herecurr);
}
# check for waitqueue_active without a comment.
if ($line =~ /\bwaitqueue_active\s*\(/) {
if (!ctx_has_comment($first_line, $linenr)) {