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[glibc] nptl: Cleanup mutex internal offset tests

From: Adhemerval Zanella <azanella at sourceware dot org>
To: glibc-cvs at sourceware dot org
Date: 26 Nov 2019 14:17:14 -0000
Subject: [glibc] nptl: Cleanup mutex internal offset tests
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=71d260c1077ce7ab1530809fc826756bdcd032b0

commit 71d260c1077ce7ab1530809fc826756bdcd032b0
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Nov 7 20:58:41 2019 +0000

    nptl: Cleanup mutex internal offset tests
    
    The offsets of pthread_mutex_t __data.__nusers, __data.__spins,
    __data.elision, __data.list are not required to be constant over
    the releases.  Only the __data.__kind is used for static
    initializers.
    
    This patch also adds an additional size check for __data.__kind.
    
    Checked with a build against affected ABIs.
    
    Change-Id: I7a4e48cc91b4c4ada57e9a5d1b151fb702bfaa9f

Diff:
---
 nptl/pthreadP.h                           |  3 +++
 nptl/pthread_mutex_init.c                 | 13 +++----------
 sysdeps/aarch64/nptl/pthread-offsets.h    |  4 ----
 sysdeps/alpha/nptl/pthread-offsets.h      |  4 ----
 sysdeps/arm/nptl/pthread-offsets.h        |  4 ----
 sysdeps/csky/nptl/pthread-offsets.h       |  4 ----
 sysdeps/hppa/nptl/pthread-offsets.h       |  4 ----
 sysdeps/i386/nptl/pthread-offsets.h       |  4 ----
 sysdeps/ia64/nptl/pthread-offsets.h       |  4 ----
 sysdeps/m68k/nptl/pthread-offsets.h       |  4 ----
 sysdeps/microblaze/nptl/pthread-offsets.h |  4 ----
 sysdeps/mips/nptl/pthread-offsets.h       |  8 --------
 sysdeps/nios2/nptl/pthread-offsets.h      |  4 ----
 sysdeps/powerpc/nptl/pthread-offsets.h    |  8 --------
 sysdeps/riscv/nptl/pthread-offsets.h      |  4 ----
 sysdeps/s390/nptl/pthread-offsets.h       |  8 --------
 sysdeps/sh/nptl/pthread-offsets.h         |  4 ----
 sysdeps/sparc/nptl/pthread-offsets.h      |  8 --------
 sysdeps/x86_64/nptl/pthread-offsets.h     |  4 ----
 19 files changed, 6 insertions(+), 94 deletions(-)

diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index bbb2bf0..9c20067 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -617,5 +617,8 @@ check_stacksize_attr (size_t st)
   _Static_assert (offsetof (type, member) == offset,			\
 		  "offset of " #member " field of " #type " != "	\
 		  ASSERT_PTHREAD_STRING (offset))
+#define ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE(type, member, mtype)	\
+  _Static_assert (sizeof (((type) { 0 }).member) != 8,	\
+		  "sizeof (" #type "." #member ") != sizeof (" #mtype "))")
 
 #endif	/* pthreadP.h */
diff --git a/nptl/pthread_mutex_init.c b/nptl/pthread_mutex_init.c
index 20800b8..daef8b4 100644
--- a/nptl/pthread_mutex_init.c
+++ b/nptl/pthread_mutex_init.c
@@ -55,18 +55,11 @@ __pthread_mutex_init (pthread_mutex_t *mutex,
 
   ASSERT_TYPE_SIZE (pthread_mutex_t, __SIZEOF_PTHREAD_MUTEX_T);
 
-  ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_mutex_t, __data.__nusers,
-				  __PTHREAD_MUTEX_NUSERS_OFFSET);
+  /* __kind is the only field where its offset should be checked to
+     avoid ABI breakage with static initializers.  */
   ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_mutex_t, __data.__kind,
 				  __PTHREAD_MUTEX_KIND_OFFSET);
-  ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_mutex_t, __data.__spins,
-				  __PTHREAD_MUTEX_SPINS_OFFSET);
-#if __PTHREAD_MUTEX_LOCK_ELISION
-  ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_mutex_t, __data.__elision,
-				  __PTHREAD_MUTEX_ELISION_OFFSET);
-#endif
-  ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_mutex_t, __data.__list,
-				  __PTHREAD_MUTEX_LIST_OFFSET);
+  ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE (pthread_mutex_t, __data.__kind, int);
 
   imutexattr = ((const struct pthread_mutexattr *) mutexattr
 		?: &default_mutexattr);
diff --git a/sysdeps/aarch64/nptl/pthread-offsets.h b/sysdeps/aarch64/nptl/pthread-offsets.h
index 16c6b0d..8208f6f 100644
--- a/sysdeps/aarch64/nptl/pthread-offsets.h
+++ b/sysdeps/aarch64/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 #define __PTHREAD_MUTEX_KIND_OFFSET     16
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     24
diff --git a/sysdeps/alpha/nptl/pthread-offsets.h b/sysdeps/alpha/nptl/pthread-offsets.h
index 16c6b0d..8208f6f 100644
--- a/sysdeps/alpha/nptl/pthread-offsets.h
+++ b/sysdeps/alpha/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 #define __PTHREAD_MUTEX_KIND_OFFSET     16
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     24
diff --git a/sysdeps/arm/nptl/pthread-offsets.h b/sysdeps/arm/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/arm/nptl/pthread-offsets.h
+++ b/sysdeps/arm/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/csky/nptl/pthread-offsets.h b/sysdeps/csky/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/csky/nptl/pthread-offsets.h
+++ b/sysdeps/csky/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/hppa/nptl/pthread-offsets.h b/sysdeps/hppa/nptl/pthread-offsets.h
index 8ae01b9..e4e775d 100644
--- a/sysdeps/hppa/nptl/pthread-offsets.h
+++ b/sysdeps/hppa/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   32
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    36
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     36
diff --git a/sysdeps/i386/nptl/pthread-offsets.h b/sysdeps/i386/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/i386/nptl/pthread-offsets.h
+++ b/sysdeps/i386/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/ia64/nptl/pthread-offsets.h b/sysdeps/ia64/nptl/pthread-offsets.h
index 16c6b0d..8208f6f 100644
--- a/sysdeps/ia64/nptl/pthread-offsets.h
+++ b/sysdeps/ia64/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 #define __PTHREAD_MUTEX_KIND_OFFSET     16
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     24
diff --git a/sysdeps/m68k/nptl/pthread-offsets.h b/sysdeps/m68k/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/m68k/nptl/pthread-offsets.h
+++ b/sysdeps/m68k/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/microblaze/nptl/pthread-offsets.h b/sysdeps/microblaze/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/microblaze/nptl/pthread-offsets.h
+++ b/sysdeps/microblaze/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/mips/nptl/pthread-offsets.h b/sysdeps/mips/nptl/pthread-offsets.h
index 0ac3eda..e96d34a 100644
--- a/sysdeps/mips/nptl/pthread-offsets.h
+++ b/sysdeps/mips/nptl/pthread-offsets.h
@@ -1,13 +1,5 @@
 #if _MIPS_SIM == _ABI64
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 # define __PTHREAD_MUTEX_KIND_OFFSET     16
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     24
 #else
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 # define __PTHREAD_MUTEX_KIND_OFFSET     12
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     20
 #endif
diff --git a/sysdeps/nios2/nptl/pthread-offsets.h b/sysdeps/nios2/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/nios2/nptl/pthread-offsets.h
+++ b/sysdeps/nios2/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/powerpc/nptl/pthread-offsets.h b/sysdeps/powerpc/nptl/pthread-offsets.h
index bdda1f1..25b5bf2 100644
--- a/sysdeps/powerpc/nptl/pthread-offsets.h
+++ b/sysdeps/powerpc/nptl/pthread-offsets.h
@@ -1,15 +1,7 @@
 #include <bits/wordsize.h>
 
 #if __WORDSIZE == 64
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 # define __PTHREAD_MUTEX_KIND_OFFSET     16
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     24
 #else
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 # define __PTHREAD_MUTEX_KIND_OFFSET     12
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     20
 #endif
diff --git a/sysdeps/riscv/nptl/pthread-offsets.h b/sysdeps/riscv/nptl/pthread-offsets.h
index f164004..6fc032f 100644
--- a/sysdeps/riscv/nptl/pthread-offsets.h
+++ b/sysdeps/riscv/nptl/pthread-offsets.h
@@ -17,8 +17,4 @@
    License along with the GNU C Library.  If not, see
    <https://www.gnu.org/licenses/>.  */
 
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 #define __PTHREAD_MUTEX_KIND_OFFSET     16
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     24
diff --git a/sysdeps/s390/nptl/pthread-offsets.h b/sysdeps/s390/nptl/pthread-offsets.h
index bdda1f1..25b5bf2 100644
--- a/sysdeps/s390/nptl/pthread-offsets.h
+++ b/sysdeps/s390/nptl/pthread-offsets.h
@@ -1,15 +1,7 @@
 #include <bits/wordsize.h>
 
 #if __WORDSIZE == 64
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 # define __PTHREAD_MUTEX_KIND_OFFSET     16
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     24
 #else
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 # define __PTHREAD_MUTEX_KIND_OFFSET     12
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     20
 #endif
diff --git a/sysdeps/sh/nptl/pthread-offsets.h b/sysdeps/sh/nptl/pthread-offsets.h
index 9617354..e4e775d 100644
--- a/sysdeps/sh/nptl/pthread-offsets.h
+++ b/sysdeps/sh/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 #define __PTHREAD_MUTEX_KIND_OFFSET     12
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     20
diff --git a/sysdeps/sparc/nptl/pthread-offsets.h b/sysdeps/sparc/nptl/pthread-offsets.h
index bdda1f1..25b5bf2 100644
--- a/sysdeps/sparc/nptl/pthread-offsets.h
+++ b/sysdeps/sparc/nptl/pthread-offsets.h
@@ -1,15 +1,7 @@
 #include <bits/wordsize.h>
 
 #if __WORDSIZE == 64
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 # define __PTHREAD_MUTEX_KIND_OFFSET     16
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     24
 #else
-# define __PTHREAD_MUTEX_NUSERS_OFFSET   16
 # define __PTHREAD_MUTEX_KIND_OFFSET     12
-# define __PTHREAD_MUTEX_SPINS_OFFSET    20
-# define __PTHREAD_MUTEX_ELISION_OFFSET  22
-# define __PTHREAD_MUTEX_LIST_OFFSET     20
 #endif
diff --git a/sysdeps/x86_64/nptl/pthread-offsets.h b/sysdeps/x86_64/nptl/pthread-offsets.h
index 16c6b0d..8208f6f 100644
--- a/sysdeps/x86_64/nptl/pthread-offsets.h
+++ b/sysdeps/x86_64/nptl/pthread-offsets.h
@@ -1,5 +1 @@
-#define __PTHREAD_MUTEX_NUSERS_OFFSET   12
 #define __PTHREAD_MUTEX_KIND_OFFSET     16
-#define __PTHREAD_MUTEX_SPINS_OFFSET    20
-#define __PTHREAD_MUTEX_ELISION_OFFSET  22
-#define __PTHREAD_MUTEX_LIST_OFFSET     24
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