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docs/atomics.txt: Update pointer to linux macro

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Add a missing end brace and update doc to point to the latest access
macro. ACCESS_ONCE() is deprecated.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Message-Id: <1462198852-28694-1-git-send-email-bobby.prani@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pranith Kumar 2016-05-02 10:20:52 -04:00 committed by Paolo Bonzini
parent d2f39add72
commit dfc007f7f7
1 changed files with 2 additions and 2 deletions
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docs/atomics.txt
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@ -62,7 +62,7 @@ operations:
typeof(*ptr) atomic_fetch_sub(ptr, val)
typeof(*ptr) atomic_fetch_and(ptr, val)
typeof(*ptr) atomic_fetch_or(ptr, val)
typeof(*ptr) atomic_xchg(ptr, val
typeof(*ptr) atomic_xchg(ptr, val)
typeof(*ptr) atomic_cmpxchg(ptr, old, new)
all of which return the old value of *ptr. These operations are
@ -328,7 +328,7 @@ and memory barriers, and the equivalents in QEMU:
- atomic_read and atomic_set in Linux give no guarantee at all;
atomic_read and atomic_set in QEMU include a compiler barrier
(similar to the ACCESS_ONCE macro in Linux).
(similar to the READ_ONCE/WRITE_ONCE macros in Linux).
- most atomic read-modify-write operations in Linux return void;
in QEMU, all of them return the old value of the variable.