Remove __ASSUME_SOCKETCALL.

The __ASSUME_SOCKETCALL macro in kernel-features.h is no longer used
for anything.  (It used to be used in defining other macros related to
accept4 / recvmmsg / sendmmsg availability, but the code in that area
was simplified once we could assume a kernel with those features,
whether through a syscall or through socketcall, so allowing those
functions to be handled much like other socket operations, without
requring __ASSUME_SOCKETCALL.)  This patch removes that unused macro.

(Note: once we can assume a Linux 4.4 or later kernel, much of the
support for using socketcall at all can be removed from glibc,
although a few functions may need that support in glibc for longer.)

Tested with build-many-glibcs.py.

	* sysdeps/unix/sysv/linux/kernel-features.h: Remove comment about
	__ASSUME_SOCKETCALL.
	* sysdeps/unix/sysv/linux/i386/kernel-features.h
	(__ASSUME_SOCKETCALL): Remove.
	* sysdeps/unix/sysv/linux/m68k/kernel-features.h
	(__ASSUME_SOCKETCALL): Likewise.
	* sysdeps/unix/sysv/linux/microblaze/kernel-features.h
	(__ASSUME_SOCKETCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/kernel-features.h
	(__ASSUME_SOCKETCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/kernel-features.h
	(__ASSUME_SOCKETCALL): Likewise.
	* sysdeps/unix/sysv/linux/sh/kernel-features.h
	(__ASSUME_SOCKETCALL): Likewise.
	* sysdeps/unix/sysv/linux/sparc/kernel-features.h
	(__ASSUME_SOCKETCALL): Likewise.

9 files changed, 19 insertions, 25 deletions

diff --git a/ChangeLog b/ChangeLog
index 78cdbcf6c4..f5a8656571 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,22 @@
+2018-11-08  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/unix/sysv/linux/kernel-features.h: Remove comment about
+	__ASSUME_SOCKETCALL.
+	* sysdeps/unix/sysv/linux/i386/kernel-features.h
+	(__ASSUME_SOCKETCALL): Remove.
+	* sysdeps/unix/sysv/linux/m68k/kernel-features.h
+	(__ASSUME_SOCKETCALL): Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/kernel-features.h
+	(__ASSUME_SOCKETCALL): Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/kernel-features.h
+	(__ASSUME_SOCKETCALL): Likewise.
+	* sysdeps/unix/sysv/linux/s390/kernel-features.h
+	(__ASSUME_SOCKETCALL): Likewise.
+	* sysdeps/unix/sysv/linux/sh/kernel-features.h
+	(__ASSUME_SOCKETCALL): Likewise.
+	* sysdeps/unix/sysv/linux/sparc/kernel-features.h
+	(__ASSUME_SOCKETCALL): Likewise.
+
 2018-11-08  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #23509]
diff --git a/sysdeps/unix/sysv/linux/i386/kernel-features.h b/sysdeps/unix/sysv/linux/i386/kernel-features.h
index f3cfd48c44..aac9b613d5 100644
--- a/sysdeps/unix/sysv/linux/i386/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/i386/kernel-features.h
@@ -17,9 +17,6 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* i386 uses socketcall.  */
-#define __ASSUME_SOCKETCALL		1
-
 /* Direct socketcalls available with kernel 4.3.  */
 #if __LINUX_KERNEL_VERSION >= 0x040300
 # define __ASSUME_SOCKET_SYSCALL             1
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 5543d92d7e..0ac1616b33 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -37,10 +37,6 @@
    introduced.  If somebody cares these values can afterwards be
    corrected.  */
 
-/* Some architectures use the socketcall multiplexer for some or all
-   socket-related operations instead of separate syscalls.
-   __ASSUME_SOCKETCALL is defined for such architectures.  */
-
 /* The changed st_ino field appeared in 2.4.0-test6.  However, SH is lame,
    and still does not have a 64-bit inode field.  */
 #define __ASSUME_ST_INO_64_BIT		1
diff --git a/sysdeps/unix/sysv/linux/m68k/kernel-features.h b/sysdeps/unix/sysv/linux/m68k/kernel-features.h
index 6980f922e3..c17eec15f0 100644
--- a/sysdeps/unix/sysv/linux/m68k/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/m68k/kernel-features.h
@@ -17,9 +17,6 @@
    License along with the GNU C Library.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* m68k uses socketcall.  */
-#define __ASSUME_SOCKETCALL	1
-
 /* Direct socketcalls available with kernel 4.3.  */
 #if __LINUX_KERNEL_VERSION >= 0x040300
 # define __ASSUME_SOCKET_SYSCALL             1
diff --git a/sysdeps/unix/sysv/linux/microblaze/kernel-features.h b/sysdeps/unix/sysv/linux/microblaze/kernel-features.h
index dfee428f49..7fb6c0cbb2 100644
--- a/sysdeps/unix/sysv/linux/microblaze/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/microblaze/kernel-features.h
@@ -16,9 +16,6 @@
    <http://www.gnu.org/licenses/>.  */
 
 
-/* MicroBlaze uses socketcall.  */
-#define __ASSUME_SOCKETCALL	1
-
 /* All supported kernel versions for MicroBlaze have these syscalls.  */
 #define __ASSUME_SOCKET_SYSCALL		1
 #define __ASSUME_BIND_SYSCALL		1
diff --git a/sysdeps/unix/sysv/linux/powerpc/kernel-features.h b/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
index 503f562d76..1d05a5d1b6 100644
--- a/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
@@ -17,9 +17,6 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* PowerPC uses socketcall.  */
-#define __ASSUME_SOCKETCALL		1
-
 /* New syscalls added for PowerPC in 2.6.37.  */
 #define __ASSUME_SOCKET_SYSCALL	1
 #define __ASSUME_BIND_SYSCALL		1
diff --git a/sysdeps/unix/sysv/linux/s390/kernel-features.h b/sysdeps/unix/sysv/linux/s390/kernel-features.h
index f718264926..ff0c4c8336 100644
--- a/sysdeps/unix/sysv/linux/s390/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/s390/kernel-features.h
@@ -17,9 +17,6 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* S/390 uses socketcall.  */
-#define __ASSUME_SOCKETCALL		1
-
 /* Direct socketcalls available with kernel 4.3.  */
 #if __LINUX_KERNEL_VERSION >= 0x040300
 # define __ASSUME_SOCKET_SYSCALL             1
diff --git a/sysdeps/unix/sysv/linux/sh/kernel-features.h b/sysdeps/unix/sysv/linux/sh/kernel-features.h
index 60b6a8126b..8b9ff0c445 100644
--- a/sysdeps/unix/sysv/linux/sh/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sh/kernel-features.h
@@ -20,9 +20,6 @@
 #ifndef __KERNEL_FEATURES_SH__
 # define __KERNEL_FEATURES_SH__
 
-/* SH uses socketcall.  */
-#define __ASSUME_SOCKETCALL		1
-
 /* These syscalls were added for SH in 2.6.37.  */
 #define __ASSUME_SOCKET_SYSCALL		1
 #define __ASSUME_BIND_SYSCALL		1
diff --git a/sysdeps/unix/sysv/linux/sparc/kernel-features.h b/sysdeps/unix/sysv/linux/sparc/kernel-features.h
index fd48081a77..b4a7227be2 100644
--- a/sysdeps/unix/sysv/linux/sparc/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sparc/kernel-features.h
@@ -17,9 +17,6 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* SPARC uses socketcall.  */
-#define __ASSUME_SOCKETCALL		1
-
 #include_next <kernel-features.h>
 
 /* 32-bit SPARC kernels do not support