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Disable 64-bit atomics for MIPS n32 [committed]

This patch disables use of 64-bit atomics for MIPS n32 to fix the
problems with unaligned semaphores.

Before 64-bit atomics are used for anything for which such alignment
issues do not arise, and before the addition of any new ILP32 ports
with 64-bit semaphores for which the ABI can be set to have the
greater alignment (AARCH64?), a better approach will need to be
established that allows architectures to declare their 64-bit atomics
availability accurately, without doing so causing inappropriate use of
such atomics on unaligned semaphores.

Tested for MIPS n32 that this fixes the nptl/tst-sem3 failure.

2015-01-28  Joseph Myers  <>

	* sysdeps/mips/bits/atomic.h [_MIPS_SIM == _ABIN32]
	(__HAVE_64B_ATOMICS): Define to 0.

diff --git a/sysdeps/mips/bits/atomic.h b/sysdeps/mips/bits/atomic.h
index ddcb039..a391881 100644
--- a/sysdeps/mips/bits/atomic.h
+++ b/sysdeps/mips/bits/atomic.h
@@ -44,7 +44,7 @@ typedef uintmax_t uatomic_max_t;
 #define MIPS_PUSH_MIPS2
-#if _MIPS_SIM == _ABIO32
+#if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32
 #define __HAVE_64B_ATOMICS 0
 #define __HAVE_64B_ATOMICS 1

Joseph S. Myers

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