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virtio: barrier rework+fixes

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This adds a new kind of barrier, and reworks virtio and xen
 to use it.
 Plus some fixes here and there.
 
 Signed-off-by: Michael S. Tsirkin <[email protected]>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

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
commit a200dcb346
44 changed files with 401 additions and 319 deletions
Download patch file Download diff file Expand all files Collapse all files

19
arch/arm64/include/asm/barrier.h
View file

@ -35,11 +35,11 @@
#define dma_rmb() dmb(oshld)
#define dma_wmb() dmb(oshst)
#define smp_mb() dmb(ish)
#define smp_rmb() dmb(ishld)
#define smp_wmb() dmb(ishst)
#define __smp_mb() dmb(ish)
#define __smp_rmb() dmb(ishld)
#define __smp_wmb() dmb(ishst)
#define smp_store_release(p, v) \
#define __smp_store_release(p, v) \
do { \
compiletime_assert_atomic_type(*p); \
switch (sizeof(*p)) { \
@ -62,7 +62,7 @@ do { \
} \
} while (0)
#define smp_load_acquire(p) \
#define __smp_load_acquire(p) \
({ \
union { typeof(*p) __val; char __c[1]; } __u; \
compiletime_assert_atomic_type(*p); \
@ -91,14 +91,7 @@ do { \
__u.__val; \
})
#define read_barrier_depends() do { } while(0)
#define smp_read_barrier_depends() do { } while(0)
#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
#define nop() asm volatile("nop");
#define smp_mb__before_atomic() smp_mb()
#define smp_mb__after_atomic() smp_mb()
#include <asm-generic/barrier.h>
#endif /* __ASSEMBLY__ */