Patchwork Move SHMLBA to its own header

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Submitter Joseph Myers
Date Oct. 15, 2018, 7:39 p.m.
Message ID <alpine.DEB.2.21.1810151938100.5059@digraph.polyomino.org.uk>
Download mbox | patch
Permalink /patch/29748/
State New
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Comments

Joseph Myers - Oct. 15, 2018, 7:39 p.m.
One difference between bits/shm.h headers for architectures using the
Linux kernel is the definition of SHMLBA.  This was noted in
<https://sourceware.org/ml/libc-alpha/2018-09/msg00175.html> as a
reason why even a new architecture (C-SKY) might need its own
bits/shm.h; thus, splitting it out of bits/shm.h can allow less
duplication of headers for new architectures.

This patch moves that definition to its own header, bits/shmlba.h, to
allow more sharing of headers between architectures.  That move allows
the arm, ia64 and sh variants of bits/shm.h to be removed, as they had
no other significant differences from the generic bits/shm.h; powerpc
and x86 have their own bits/shm.h but do not need to get their own
bits/shmlba.h because they use the same SHMLBA as the generic header.
Other architectures with their own bits/shm.h get their own
bits/shmlba.h without being able to remove their own bits/shm.h until
the generic one has been adapted to be able to handle more
architectures (where, in addition to the differences seen for
bits/msq.h and bits/sem.h, the position of shm_segsz in struct
shmid_ds also depends on the architecture).

Tested for x86_64 and x86, and with build-many-glibcs.py.

2018-10-15  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
	bits/shmlba.h.
	* sysdeps/unix/sysv/linux/bits/shm.h: Include <bits/shmlba.h>.
	(SHMLBA): Remove macro.
	(__getpagesize): Remove function declaration.
	* sysdeps/unix/sysv/linux/hppa/bits/shm.h: Include
	<bits/shmlba.h>.
	(SHMLBA): Remove macro.
	* sysdeps/unix/sysv/linux/mips/bits/shm.h: Include
	<bits/shmlba.h>.
	(SHMLBA): Remove macro.
	* sysdeps/unix/sysv/linux/powerpc/bits/shm.h: Include
	<bits/shmlba.h>.
	(SHMLBA): Remove macro.
	(__getpagesize): Remove function declaration.
	* sysdeps/unix/sysv/linux/sparc/bits/shm.h: Include
	<bits/shmlba.h>.
	(SHMLBA): Remove macro.
	(__getshmlba): Remove function declaration.
	* sysdeps/unix/sysv/linux/x86/bits/shm.h: Include <bits/shmlba.h>.
	(SHMLBA): Remove macro.
	(__getpagesize): Remove function declaration.
	* sysdeps/unix/sysv/linux/arm/bits/shm.h: Remove file.
	* sysdeps/unix/sysv/linux/ia64/bits/shm.h: Likewise.
	* sysdeps/unix/sysv/linux/sh/bits/shm.h: Likewise.
	* sysdeps/unix/sysv/linux/bits/shmlba.h: New file.
	* sysdeps/unix/sysv/linux/arm/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/hppa/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/sh/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/shmlba.h: Likewise.
Andreas Schwab - Oct. 17, 2018, 7:45 a.m.
On Okt 15 2018, Joseph Myers <joseph@codesourcery.com> wrote:

> 	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
> 	bits/shmlba.h.
> 	* sysdeps/unix/sysv/linux/bits/shm.h: Include <bits/shmlba.h>.
> 	(SHMLBA): Remove macro.
> 	(__getpagesize): Remove function declaration.
> 	* sysdeps/unix/sysv/linux/hppa/bits/shm.h: Include
> 	<bits/shmlba.h>.
> 	(SHMLBA): Remove macro.
> 	* sysdeps/unix/sysv/linux/mips/bits/shm.h: Include
> 	<bits/shmlba.h>.
> 	(SHMLBA): Remove macro.
> 	* sysdeps/unix/sysv/linux/powerpc/bits/shm.h: Include
> 	<bits/shmlba.h>.
> 	(SHMLBA): Remove macro.
> 	(__getpagesize): Remove function declaration.
> 	* sysdeps/unix/sysv/linux/sparc/bits/shm.h: Include
> 	<bits/shmlba.h>.
> 	(SHMLBA): Remove macro.
> 	(__getshmlba): Remove function declaration.
> 	* sysdeps/unix/sysv/linux/x86/bits/shm.h: Include <bits/shmlba.h>.
> 	(SHMLBA): Remove macro.
> 	(__getpagesize): Remove function declaration.
> 	* sysdeps/unix/sysv/linux/arm/bits/shm.h: Remove file.
> 	* sysdeps/unix/sysv/linux/ia64/bits/shm.h: Likewise.
> 	* sysdeps/unix/sysv/linux/sh/bits/shm.h: Likewise.
> 	* sysdeps/unix/sysv/linux/bits/shmlba.h: New file.
> 	* sysdeps/unix/sysv/linux/arm/bits/shmlba.h: Likewise.
> 	* sysdeps/unix/sysv/linux/hppa/bits/shmlba.h: Likewise.
> 	* sysdeps/unix/sysv/linux/ia64/bits/shmlba.h: Likewise.
> 	* sysdeps/unix/sysv/linux/mips/bits/shmlba.h: Likewise.
> 	* sysdeps/unix/sysv/linux/sh/bits/shmlba.h: Likewise.
> 	* sysdeps/unix/sysv/linux/sparc/bits/shmlba.h: Likewise.

Ok.

Andreas.

Patch

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index edb1d29bf3..27c7ef6a55 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -43,7 +43,7 @@  sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 		  bits/siginfo-arch.h bits/siginfo-consts-arch.h \
 		  bits/procfs.h bits/procfs-id.h bits/procfs-extra.h \
 		  bits/procfs-prregset.h bits/mman-map-flags-generic.h \
-		  bits/msq-pad.h bits/sem-pad.h
+		  bits/msq-pad.h bits/sem-pad.h bits/shmlba.h
 
 tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
 	 tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \
diff --git a/sysdeps/unix/sysv/linux/arm/bits/shm.h b/sysdeps/unix/sysv/linux/arm/bits/shm.h
deleted file mode 100644
index e3d4916a50..0000000000
--- a/sysdeps/unix/sysv/linux/arm/bits/shm.h
+++ /dev/null
@@ -1,104 +0,0 @@ 
-/* Copyright (C) 1995-2018 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
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library.  If not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _SYS_SHM_H
-# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
-#endif
-
-#include <bits/types.h>
-
-/* Permission flag for shmget.  */
-#define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
-#define SHM_W		0200		/* or S_IWUGO from <linux/stat.h> */
-
-/* Flags for `shmat'.  */
-#define SHM_RDONLY	010000		/* attach read-only else read-write */
-#define SHM_RND		020000		/* round attach address to SHMLBA */
-#define SHM_REMAP	040000		/* take-over region on attach */
-#define SHM_EXEC	0100000		/* execution access */
-
-/* Commands for `shmctl'.  */
-#define SHM_LOCK	11		/* lock segment (root only) */
-#define SHM_UNLOCK	12		/* unlock segment (root only) */
-
-__BEGIN_DECLS
-
-/* Segment low boundary address multiple.  */
-#define SHMLBA		(__getpagesize () << 2)
-extern int __getpagesize (void) __THROW __attribute__ ((__const__));
-
-
-/* Type to count number of attaches.  */
-typedef unsigned long int shmatt_t;
-
-/* Data structure describing a shared memory segment.  */
-struct shmid_ds
-  {
-    struct ipc_perm shm_perm;		/* operation permission struct */
-    size_t shm_segsz;			/* size of segment in bytes */
-    __time_t shm_atime;			/* time of last shmat() */
-    unsigned long int __glibc_reserved1;
-    __time_t shm_dtime;			/* time of last shmdt() */
-    unsigned long int __glibc_reserved2;
-    __time_t shm_ctime;			/* time of last change by shmctl() */
-    unsigned long int __glibc_reserved3;
-    __pid_t shm_cpid;			/* pid of creator */
-    __pid_t shm_lpid;			/* pid of last shmop */
-    shmatt_t shm_nattch;		/* number of current attaches */
-    unsigned long int __glibc_reserved4;
-    unsigned long int __glibc_reserved5;
-  };
-
-#ifdef __USE_MISC
-
-/* ipcs ctl commands */
-# define SHM_STAT 	13
-# define SHM_INFO 	14
-# define SHM_STAT_ANY	15
-
-/* shm_mode upper byte flags */
-# define SHM_DEST	01000	/* segment will be destroyed on last detach */
-# define SHM_LOCKED	02000   /* segment will not be swapped */
-# define SHM_HUGETLB	04000	/* segment is mapped via hugetlb */
-# define SHM_NORESERVE	010000	/* don't check for reservations */
-
-struct	shminfo
-  {
-    unsigned long int shmmax;
-    unsigned long int shmmin;
-    unsigned long int shmmni;
-    unsigned long int shmseg;
-    unsigned long int shmall;
-    unsigned long int __glibc_reserved1;
-    unsigned long int __glibc_reserved2;
-    unsigned long int __glibc_reserved3;
-    unsigned long int __glibc_reserved4;
-  };
-
-struct shm_info
-  {
-    int used_ids;
-    unsigned long int shm_tot;	/* total allocated shm */
-    unsigned long int shm_rss;	/* total resident shm */
-    unsigned long int shm_swp;	/* total swapped shm */
-    unsigned long int swap_attempts;
-    unsigned long int swap_successes;
-  };
-
-#endif /* __USE_MISC */
-
-__END_DECLS
diff --git a/sysdeps/unix/sysv/linux/arm/bits/shmlba.h b/sysdeps/unix/sysv/linux/arm/bits/shmlba.h
new file mode 100644
index 0000000000..521a325c45
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/bits/shmlba.h
@@ -0,0 +1,29 @@ 
+/* Define SHMLBA.  ARM version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+__BEGIN_DECLS
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		(__getpagesize () << 2)
+extern int __getpagesize (void) __THROW __attribute__ ((__const__));
+
+__END_DECLS
diff --git a/sysdeps/unix/sysv/linux/bits/shm.h b/sysdeps/unix/sysv/linux/bits/shm.h
index 0f10d94f1f..c305ee4e72 100644
--- a/sysdeps/unix/sysv/linux/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/bits/shm.h
@@ -21,6 +21,7 @@ 
 
 #include <bits/types.h>
 #include <bits/wordsize.h>
+#include <bits/shmlba.h>
 
 /* Permission flag for shmget.  */
 #define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
@@ -38,11 +39,6 @@ 
 
 __BEGIN_DECLS
 
-/* Segment low boundary address multiple.  */
-#define SHMLBA		(__getpagesize ())
-extern int __getpagesize (void) __THROW __attribute__ ((__const__));
-
-
 /* Type to count number of attaches.  */
 typedef unsigned long int shmatt_t;
 
diff --git a/sysdeps/unix/sysv/linux/bits/shmlba.h b/sysdeps/unix/sysv/linux/bits/shmlba.h
new file mode 100644
index 0000000000..aa10b2bd64
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/shmlba.h
@@ -0,0 +1,29 @@ 
+/* Define SHMLBA.  Generic version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+__BEGIN_DECLS
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		(__getpagesize ())
+extern int __getpagesize (void) __THROW __attribute__ ((__const__));
+
+__END_DECLS
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/shm.h b/sysdeps/unix/sysv/linux/hppa/bits/shm.h
index 4967c94190..fed18e491a 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/shm.h
@@ -21,6 +21,7 @@ 
 
 #include <bits/types.h>
 #include <bits/wordsize.h>
+#include <bits/shmlba.h>
 
 /* Permission flag for shmget.  */
 #define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
@@ -36,9 +37,6 @@ 
 #define SHM_LOCK	11		/* lock segment (root only) */
 #define SHM_UNLOCK	12		/* unlock segment (root only) */
 
-/* Segment low boundary address multiple.  */
-#define SHMLBA		0x1000
-
 /* Type to count number of attaches.  */
 typedef unsigned long int shmatt_t;
 
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/shmlba.h b/sysdeps/unix/sysv/linux/hppa/bits/shmlba.h
new file mode 100644
index 0000000000..428297714f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/hppa/bits/shmlba.h
@@ -0,0 +1,24 @@ 
+/* Define SHMLBA.  HPPA version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		0x1000
diff --git a/sysdeps/unix/sysv/linux/ia64/bits/shm.h b/sysdeps/unix/sysv/linux/ia64/bits/shm.h
deleted file mode 100644
index 814f61bd7e..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/bits/shm.h
+++ /dev/null
@@ -1,95 +0,0 @@ 
-/* Copyright (C) 2000-2018 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
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _SYS_SHM_H
-# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
-#endif
-
-#include <sys/types.h>
-
-/* Permission flag for shmget.  */
-#define SHM_R           0400            /* or S_IRUGO from <linux/stat.h> */
-#define SHM_W           0200            /* or S_IWUGO from <linux/stat.h> */
-
-/* Flags for `shmat'.  */
-#define SHM_RDONLY	010000		/* attach read-only else read-write */
-#define SHM_RND		020000		/* round attach address to SHMLBA */
-#define SHM_REMAP	040000		/* take-over region on attach */
-#define SHM_EXEC	0100000		/* execution access */
-
-/* Commands for `shmctl'.  */
-#define SHM_LOCK	11		/* lock segment (root only) */
-#define SHM_UNLOCK	12		/* unlock segment (root only) */
-
-/* Segment low boundary address multiple.  */
-#define SHMLBA		(1024 * 1024)
-
-/* Type to count number of attaches.  */
-typedef unsigned long int shmatt_t;
-
-/* Data structure describing a shared memory segment.  */
-struct shmid_ds
-  {
-    struct ipc_perm shm_perm;		/* operation permission struct */
-    size_t shm_segsz;			/* size of segment in bytes */
-    __time_t shm_atime;			/* time of last shmat() */
-    __time_t shm_dtime;			/* time of last shmdt() */
-    __time_t shm_ctime;			/* time of last change by shmctl() */
-    __pid_t shm_cpid;			/* pid of creator */
-    __pid_t shm_lpid;			/* pid of last shmop */
-    shmatt_t shm_nattch;		/* number of current attaches */
-    unsigned long int __glibc_reserved1;
-    unsigned long int __glibc_reserved2;
-  };
-
-#ifdef __USE_MISC
-
-/* ipcs ctl commands */
-# define SHM_STAT 	13
-# define SHM_INFO 	14
-# define SHM_STAT_ANY	15
-
-/* shm_mode upper byte flags */
-# define SHM_DEST	01000	/* segment will be destroyed on last detach */
-# define SHM_LOCKED	02000   /* segment will not be swapped */
-# define SHM_HUGETLB	04000	/* segment is mapped via hugetlb */
-# define SHM_NORESERVE	010000	/* don't check for reservations */
-
-struct	shminfo
-  {
-    unsigned long int shmmax;
-    unsigned long int shmmin;
-    unsigned long int shmmni;
-    unsigned long int shmseg;
-    unsigned long int shmall;
-    unsigned long int __glibc_reserved1;
-    unsigned long int __glibc_reserved2;
-    unsigned long int __glibc_reserved3;
-    unsigned long int __glibc_reserved4;
-  };
-
-struct shm_info
-  {
-    int used_ids;
-    unsigned long int shm_tot;	/* total allocated shm */
-    unsigned long int shm_rss;	/* total resident shm */
-    unsigned long int shm_swp;	/* total swapped shm */
-    unsigned long int swap_attempts;
-    unsigned long int swap_successes;
-  };
-
-#endif /* __USE_MISC */
diff --git a/sysdeps/unix/sysv/linux/ia64/bits/shmlba.h b/sysdeps/unix/sysv/linux/ia64/bits/shmlba.h
new file mode 100644
index 0000000000..01c9f2edc6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/bits/shmlba.h
@@ -0,0 +1,24 @@ 
+/* Define SHMLBA.  IA64 version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		(1024 * 1024)
diff --git a/sysdeps/unix/sysv/linux/mips/bits/shm.h b/sysdeps/unix/sysv/linux/mips/bits/shm.h
index 22068d7729..4320bd4c7c 100644
--- a/sysdeps/unix/sysv/linux/mips/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/mips/bits/shm.h
@@ -20,6 +20,7 @@ 
 #endif
 
 #include <bits/types.h>
+#include <bits/shmlba.h>
 
 /* Permission flag for shmget.  */
 #define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
@@ -35,9 +36,6 @@ 
 #define SHM_LOCK	11		/* lock segment (root only) */
 #define SHM_UNLOCK	12		/* unlock segment (root only) */
 
-/* Segment low boundary address multiple.  */
-#define SHMLBA		0x40000
-
 
 /* Type to count number of attaches.  */
 typedef unsigned long int shmatt_t;
diff --git a/sysdeps/unix/sysv/linux/mips/bits/shmlba.h b/sysdeps/unix/sysv/linux/mips/bits/shmlba.h
new file mode 100644
index 0000000000..132943b89c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mips/bits/shmlba.h
@@ -0,0 +1,24 @@ 
+/* Define SHMLBA.  MIPS version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		0x40000
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/shm.h b/sysdeps/unix/sysv/linux/powerpc/bits/shm.h
index 879023fb9a..a41a1ab33c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/shm.h
@@ -20,6 +20,7 @@ 
 #endif
 
 #include <bits/types.h>
+#include <bits/shmlba.h>
 
 /* Permission flag for shmget.  */
 #define SHM_R          0400            /* or S_IRUGO from <linux/stat.h> */
@@ -37,10 +38,6 @@ 
 
 __BEGIN_DECLS
 
-/* Segment low boundary address multiple.  */
-#define SHMLBA		(__getpagesize ())
-extern int __getpagesize (void) __THROW __attribute__ ((__const__));
-
 
 /* Type to count number of attaches.  */
 typedef unsigned long int shmatt_t;
diff --git a/sysdeps/unix/sysv/linux/sh/bits/shm.h b/sysdeps/unix/sysv/linux/sh/bits/shm.h
deleted file mode 100644
index 25ca3a2abb..0000000000
--- a/sysdeps/unix/sysv/linux/sh/bits/shm.h
+++ /dev/null
@@ -1,102 +0,0 @@ 
-/* Copyright (C) 1995-2018 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
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _SYS_SHM_H
-# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
-#endif
-
-#include <bits/types.h>
-
-/* Permission flag for shmget.  */
-#define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
-#define SHM_W		0200		/* or S_IWUGO from <linux/stat.h> */
-
-/* Flags for `shmat'.  */
-#define SHM_RDONLY	010000		/* attach read-only else read-write */
-#define SHM_RND		020000		/* round attach address to SHMLBA */
-#define SHM_REMAP	040000		/* take-over region on attach */
-#define SHM_EXEC	0100000		/* execution access */
-
-/* Commands for `shmctl'.  */
-#define SHM_LOCK	11		/* lock segment (root only) */
-#define SHM_UNLOCK	12		/* unlock segment (root only) */
-
-__BEGIN_DECLS
-
-/* Segment low boundary address multiple.  */
-#define SHMLBA		0x4000
-
-/* Type to count number of attaches.  */
-typedef unsigned long int shmatt_t;
-
-/* Data structure describing a shared memory segment.  */
-struct shmid_ds
-  {
-    struct ipc_perm shm_perm;		/* operation permission struct */
-    size_t shm_segsz;			/* size of segment in bytes */
-    __time_t shm_atime;			/* time of last shmat() */
-    unsigned long int __glibc_reserved1;
-    __time_t shm_dtime;			/* time of last shmdt() */
-    unsigned long int __glibc_reserved2;
-    __time_t shm_ctime;			/* time of last change by shmctl() */
-    unsigned long int __glibc_reserved3;
-    __pid_t shm_cpid;			/* pid of creator */
-    __pid_t shm_lpid;			/* pid of last shmop */
-    shmatt_t shm_nattch;		/* number of current attaches */
-    unsigned long int __glibc_reserved4;
-    unsigned long int __glibc_reserved5;
-  };
-
-#ifdef __USE_MISC
-
-/* ipcs ctl commands */
-# define SHM_STAT 	13
-# define SHM_INFO 	14
-# define SHM_STAT_ANY	15
-
-/* shm_mode upper byte flags */
-# define SHM_DEST	01000	/* segment will be destroyed on last detach */
-# define SHM_LOCKED	02000   /* segment will not be swapped */
-# define SHM_HUGETLB	04000	/* segment is mapped via hugetlb */
-# define SHM_NORESERVE	010000	/* don't check for reservations */
-
-struct	shminfo
-  {
-    unsigned long int shmmax;
-    unsigned long int shmmin;
-    unsigned long int shmmni;
-    unsigned long int shmseg;
-    unsigned long int shmall;
-    unsigned long int __glibc_reserved1;
-    unsigned long int __glibc_reserved2;
-    unsigned long int __glibc_reserved3;
-    unsigned long int __glibc_reserved4;
-  };
-
-struct shm_info
-  {
-    int used_ids;
-    unsigned long int shm_tot;	/* total allocated shm */
-    unsigned long int shm_rss;	/* total resident shm */
-    unsigned long int shm_swp;	/* total swapped shm */
-    unsigned long int swap_attempts;
-    unsigned long int swap_successes;
-  };
-
-#endif /* __USE_MISC */
-
-__END_DECLS
diff --git a/sysdeps/unix/sysv/linux/sh/bits/shmlba.h b/sysdeps/unix/sysv/linux/sh/bits/shmlba.h
new file mode 100644
index 0000000000..5c337b326d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sh/bits/shmlba.h
@@ -0,0 +1,24 @@ 
+/* Define SHMLBA.  SH version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		0x4000
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/shm.h b/sysdeps/unix/sysv/linux/sparc/bits/shm.h
index d967f167d9..5262a79210 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/shm.h
@@ -21,6 +21,7 @@ 
 
 #include <bits/types.h>
 #include <bits/wordsize.h>
+#include <bits/shmlba.h>
 
 /* Permission flag for shmget.  */
 #define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
@@ -38,10 +39,6 @@ 
 
 __BEGIN_DECLS
 
-/* Segment low boundary address multiple.  */
-#define SHMLBA		(__getshmlba ())
-extern int __getshmlba (void) __attribute__ ((__const__));
-
 
 /* Type to count number of attaches.  */
 typedef unsigned long int shmatt_t;
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/shmlba.h b/sysdeps/unix/sysv/linux/sparc/bits/shmlba.h
new file mode 100644
index 0000000000..fe2a76b2c3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/bits/shmlba.h
@@ -0,0 +1,29 @@ 
+/* Define SHMLBA.  SPARC version.
+   Copyright (C) 2018 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+__BEGIN_DECLS
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		(__getshmlba ())
+extern int __getshmlba (void) __attribute__ ((__const__));
+
+__END_DECLS
diff --git a/sysdeps/unix/sysv/linux/x86/bits/shm.h b/sysdeps/unix/sysv/linux/x86/bits/shm.h
index 767bb78573..4b88ff09aa 100644
--- a/sysdeps/unix/sysv/linux/x86/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/x86/bits/shm.h
@@ -20,6 +20,7 @@ 
 #endif
 
 #include <bits/types.h>
+#include <bits/shmlba.h>
 
 /* Permission flag for shmget.  */
 #define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
@@ -37,10 +38,6 @@ 
 
 __BEGIN_DECLS
 
-/* Segment low boundary address multiple.  */
-#define SHMLBA		(__getpagesize ())
-extern int __getpagesize (void) __THROW __attribute__ ((__const__));
-
 
 /* Type to count number of attaches.  */
 typedef __syscall_ulong_t shmatt_t;