From aeb4d2e9815d459e2640a31f5abb8ef803830107 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Tue, 30 Aug 2022 10:33:15 -0300
Subject: m68k: Enforce 4-byte alignment on internal locks (BZ #29537)

A new internal definition, __LIBC_LOCK_ALIGNMENT, is used to force
the 4-byte alignment only for m68k, other architecture keep the
natural alignment of the type used internally (and hppa does not
require 16-byte alignment for kernel-assisted CAS).

Reviewed-by: Florian Weimer <fweimer@redhat.com>
---
 sysdeps/nptl/libc-lock.h  | 8 +++++++-
 sysdeps/nptl/libc-lockP.h | 3 ++-
 2 files changed, 9 insertions(+), 2 deletions(-)

(limited to 'sysdeps/nptl')

diff --git a/sysdeps/nptl/libc-lock.h b/sysdeps/nptl/libc-lock.h
index 5af476c48b..63b3f3d75c 100644
--- a/sysdeps/nptl/libc-lock.h
+++ b/sysdeps/nptl/libc-lock.h
@@ -22,6 +22,7 @@
 #include <pthread.h>
 #define __need_NULL
 #include <stddef.h>
+#include <libc-lock-arch.h>
 
 
 /* Mutex type.  */
@@ -29,7 +30,12 @@
 # if (!IS_IN (libc) && !IS_IN (libpthread)) || !defined _LIBC
 typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t;
 # else
-typedef struct { int lock; int cnt; void *owner; } __libc_lock_recursive_t;
+typedef struct
+{
+  int lock __LIBC_LOCK_ALIGNMENT;
+  int cnt;
+  void *owner;
+} __libc_lock_recursive_t;
 # endif
 #else
 typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t;
diff --git a/sysdeps/nptl/libc-lockP.h b/sysdeps/nptl/libc-lockP.h
index d3a6837fd2..425f514c5c 100644
--- a/sysdeps/nptl/libc-lockP.h
+++ b/sysdeps/nptl/libc-lockP.h
@@ -32,9 +32,10 @@
    ld.so might be used on old kernels with a different libc.so.  */
 #include <lowlevellock.h>
 #include <tls.h>
+#include <libc-lock-arch.h>
 
 /* Mutex type.  */
-typedef int __libc_lock_t;
+typedef int __libc_lock_t __LIBC_LOCK_ALIGNMENT;
 typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t;
 typedef pthread_rwlock_t __libc_rwlock_t;
 
-- 
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