GNU C Library master sources branch gentoo/2.21 updated. glibc-2.21-21-g43d7ce9

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=43d7ce9238c59c61003994cb26eff4a6a072ebd5

commit 43d7ce9238c59c61003994cb26eff4a6a072ebd5
Author: Mike Frysinger <vapier@gentoo.org>
Date:   Tue Jul 28 02:19:49 2015 -0400

    ia64: atomic.h: fix atomic_exchange_and_add 64bit handling
    
    Way back in 2005 the atomic_exchange_and_add function was cleaned up to
    avoid the explicit size checking and instead let gcc handle things itself.
    Unfortunately that change ended up leaving beyond a cast to int, even when
    the incoming value was a long.  This has flown under the radar for a long
    time due to the function not being heavily used in the tree (especially as
    a full 64bit field), but a recent change to semaphores made some nptl tests
    fail reliably.  This is due to the code packing two 32bit values into one
    64bit variable (where the high 32bits contained the number of waiters), and
    then the whole variable being atomically updated between threads.  On ia64,
    that meant we never atomically updated the count, so sometimes the sem_post
    would not wake up the waiters.
    
    (cherry picked from commit cf31a2c79957936b60de34ea1e718e892baf669c)
    (cherry picked from commit 978908245b2c0f759100708a9966649f7b273664)

diff --git a/sysdeps/ia64/bits/atomic.h b/sysdeps/ia64/bits/atomic.h
index 0e9dfc7..4c2b540 100644
--- a/sysdeps/ia64/bits/atomic.h
+++ b/sysdeps/ia64/bits/atomic.h
@@ -82,9 +82,7 @@ typedef uintmax_t uatomic_max_t;
   (__sync_synchronize (), __sync_lock_test_and_set (mem, value))
 
 #define atomic_exchange_and_add(mem, value) \
-  ({ __typeof (*mem) __result;						      \
-     __result = __sync_fetch_and_add ((mem), (int) (value));		      \
-     __result; })
+  __sync_fetch_and_add ((mem), (value))
 
 #define atomic_decrement_if_positive(mem) \
   ({ __typeof (*mem) __oldval, __val;					      \

-----------------------------------------------------------------------

Summary of changes:
 sysdeps/ia64/bits/atomic.h |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)


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