Pad each field to __syscall_slong_t in struct rusage

ChangeLog

@@ -1,3 +1,10 @@
+2012-05-22  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* sysdeps/unix/sysv/linux/bits/resource.h (RLIM_INFINITY): Use
+	__rlim_t cast.
+	(struct rusage): Use anonymous union to pad each field to
+	__syscall_slong_t.
+
 2012-05-21  David S. Miller  <davem@davemloft.net>
 
 	* Makefules (o-iterator): Remove .s cases.

sysdeps/unix/sysv/linux/bits/resource.h

@@ -1,6 +1,5 @@
 /* Bit values & structures for resource limits.  Linux version.
-   Copyright (C) 1994, 1996-2000, 2004, 2005, 2008, 2009, 2010, 2011, 2012
-   Free Software Foundation, Inc.
+   Copyright (C) 1994-2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -113,7 +112,7 @@ enum __rlimit_resource
 
 /* Value to indicate that there is no limit.  */
 #ifndef __USE_FILE_OFFSET64
-# define RLIM_INFINITY ((unsigned long int)(~0UL))
+# define RLIM_INFINITY ((__rlim_t) -1)
 #else
 # define RLIM_INFINITY 0xffffffffffffffffuLL
 #endif
@@ -180,6 +179,11 @@ enum __rusage_who
 #include <bits/time.h>		/* For `struct timeval'.  */
 
 /* Structure which says how much of each resource has been used.  */
+
+/* The purpose of all the unions is to have the kernel-compatible layout
+   while keeping the API type as 'long int', and among machines where
+   __syscall_slong_t is not 'long int', this only does the right thing
+   for little-endian ones, like x32.  */
 struct rusage
   {
     /* Total amount of user time used.  */
@@ -187,39 +191,96 @@ struct rusage
     /* Total amount of system time used.  */
     struct timeval ru_stime;
     /* Maximum resident set size (in kilobytes).  */
-    long int ru_maxrss;
+    __extension__ union
+      {
+	long int ru_maxrss;
+	__syscall_slong_t __ru_maxrss_word;
+      };
     /* Amount of sharing of text segment memory
        with other processes (kilobyte-seconds).  */
-    long int ru_ixrss;
+    /* Maximum resident set size (in kilobytes).  */
+    __extension__ union
+      {
+	long int ru_ixrss;
+	__syscall_slong_t __ru_ixrss_word;
+      };
     /* Amount of data segment memory used (kilobyte-seconds).  */
-    long int ru_idrss;
+    __extension__ union
+      {
+	long int ru_idrss;
+	__syscall_slong_t __ru_idrss_word;
+      };
     /* Amount of stack memory used (kilobyte-seconds).  */
-    long int ru_isrss;
+    __extension__ union
+      {
+	long int ru_isrss;
+	 __syscall_slong_t __ru_isrss_word;
+      };
     /* Number of soft page faults (i.e. those serviced by reclaiming
        a page from the list of pages awaiting reallocation.  */
-    long int ru_minflt;
+    __extension__ union
+      {
+	long int ru_minflt;
+	__syscall_slong_t __ru_minflt_word;
+      };
     /* Number of hard page faults (i.e. those that required I/O).  */
-    long int ru_majflt;
+    __extension__ union
+      {
+	long int ru_majflt;
+	__syscall_slong_t __ru_majflt_word;
+      };
     /* Number of times a process was swapped out of physical memory.  */
-    long int ru_nswap;
+    __extension__ union
+      {
+	long int ru_nswap;
+	__syscall_slong_t __ru_nswap_word;
+      };
     /* Number of input operations via the file system.  Note: This
        and `ru_oublock' do not include operations with the cache.  */
-    long int ru_inblock;
+    __extension__ union
+      {
+	long int ru_inblock;
+	__syscall_slong_t __ru_inblock_word;
+      };
     /* Number of output operations via the file system.  */
-    long int ru_oublock;
+    __extension__ union
+      {
+	long int ru_oublock;
+	__syscall_slong_t __ru_oublock_word;
+      };
     /* Number of IPC messages sent.  */
-    long int ru_msgsnd;
+    __extension__ union
+      {
+	long int ru_msgsnd;
+	__syscall_slong_t __ru_msgsnd_word;
+      };
     /* Number of IPC messages received.  */
-    long int ru_msgrcv;
+    __extension__ union
+      {
+	long int ru_msgrcv;
+	__syscall_slong_t __ru_msgrcv_word;
+      };
     /* Number of signals delivered.  */
-    long int ru_nsignals;
+    __extension__ union
+      {
+	long int ru_nsignals;
+	__syscall_slong_t __ru_nsignals_word;
+      };
     /* Number of voluntary context switches, i.e. because the process
        gave up the process before it had to (usually to wait for some
        resource to be available).  */
-    long int ru_nvcsw;
+    __extension__ union
+      {
+	long int ru_nvcsw;
+	__syscall_slong_t __ru_nvcsw_word;
+      };
     /* Number of involuntary context switches, i.e. a higher priority process
        became runnable or the current process used up its time slice.  */
-    long int ru_nivcsw;
+    __extension__ union
+      {
+	long int ru_nivcsw;
+	__syscall_slong_t __ru_nivcsw_word;
+      };
   };
 
 /* Priority limits.  */