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hppa: Drop 16-byte pthread lock alignment

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Linux threads were removed about 12 years ago and the current
nptl implementation only requires 4-byte alignment for pthread
locks.

The 16-byte alignment causes various issues. For example in
building ignition-msgs, we have:

/usr/include/google/protobuf/map.h:124:37: error: static assertion failed
  124 |   static_assert(alignof(value_type) <= 8, "");
      |                 ~~~~~~~~~~~~~~~~~~~~^~~~

This is caused by the 16-byte pthread lock alignment.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
This commit is contained in:
John David Anglin 2023-03-26 21:16:22 +00:00
parent 1b5e65ef6a
commit ab991a3d1b
2 changed files with 9 additions and 3 deletions
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2
sysdeps/hppa/nptl/bits/pthreadtypes-arch.h
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@ -40,7 +40,7 @@
#define __SIZEOF_PTHREAD_RWLOCK_T 64
#define __SIZEOF_PTHREAD_RWLOCKATTR_T 8
#define __LOCK_ALIGNMENT __attribute__ ((__aligned__(16)))
#define __LOCK_ALIGNMENT
#define __ONCE_ALIGNMENT
#endif /* bits/pthreadtypes.h */

10
sysdeps/hppa/nptl/bits/struct_rwlock.h
View File

@ -25,8 +25,14 @@ struct __pthread_rwlock_arch_t
/* In the old Linuxthreads pthread_rwlock_t, this is the
start of the 4-word 16-byte aligned lock structure. The
next four words are all set to 1 by the Linuxthreads
PTHREAD_RWLOCK_INITIALIZER. We ignore them in NPTL. */
int __compat_padding[4] __attribute__ ((__aligned__(16)));
PTHREAD_RWLOCK_INITIALIZER. We ignore them in NPTL.
The 16-byte aligned lock stucture causes various pthread
structures to be over aligned. This causes some builds
to fail which assume a maximum alignment of 8 bytes.
Linuxthreads has been removed for 12 years, so drop
alignment of lock structure. */
int __compat_padding[4];
unsigned int __readers;
unsigned int __writers;
unsigned int __wrphase_futex;