flag parameters add-on: remove epoll_create size param

Remove the size parameter from the new epoll_create syscall and renames the
syscall itself. The updated test program follows.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <fcntl.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <sys/syscall.h>

#ifndef __NR_epoll_create2
# ifdef __x86_64__
# define __NR_epoll_create2 291
# elif defined __i386__
# define __NR_epoll_create2 329
# else
# error "need __NR_epoll_create2"
# endif
#endif

#define EPOLL_CLOEXEC O_CLOEXEC

int
main (void)
{
int fd = syscall (__NR_epoll_create2, 0);
if (fd == -1)
{
puts ("epoll_create2(0) failed");
return 1;
}
int coe = fcntl (fd, F_GETFD);
if (coe == -1)
{
puts ("fcntl failed");
return 1;
}
if (coe & FD_CLOEXEC)
{
puts ("epoll_create2(0) set close-on-exec flag");
return 1;
}
close (fd);

fd = syscall (__NR_epoll_create2, EPOLL_CLOEXEC);
if (fd == -1)
{
puts ("epoll_create2(EPOLL_CLOEXEC) failed");
return 1;
}
coe = fcntl (fd, F_GETFD);
if (coe == -1)
{
puts ("fcntl failed");
return 1;
}
if ((coe & FD_CLOEXEC) == 0)
{
puts ("epoll_create2(EPOLL_CLOEXEC) set close-on-exec flag");
return 1;
}
close (fd);

puts ("OK");

return 0;
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Ulrich Drepper <[e-mail]>
Acked-by: Davide Libenzi <[e-mail]>
Cc: Michael Kerrisk <[e-mail]>
Cc: <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/x86/ia32/ia32entry.S

···
 	.quad compat_sys_timerfd_gettime
 	.quad compat_sys_signalfd4
 	.quad sys_eventfd2
-	.quad sys_epoll_create2
+	.quad sys_epoll_create1
 	.quad sys_dup3			/* 330 */
 	.quad sys_pipe2
 	.quad sys_inotify_init1

arch/x86/kernel/syscall_table_32.S

···
 	.long sys_timerfd_gettime
 	.long sys_signalfd4
 	.long sys_eventfd2
-	.long sys_epoll_create2
+	.long sys_epoll_create1
 	.long sys_dup3			/* 330 */
 	.long sys_pipe2
 	.long sys_inotify_init1

fs/eventpoll.c

···
  * RB tree. With the current implementation, the "size" parameter is ignored
  * (besides sanity checks).
  */
-asmlinkage long sys_epoll_create2(int size, int flags)
+asmlinkage long sys_epoll_create1(int flags)
 {
 	int error, fd = -1;
 	struct eventpoll *ep;
···
 		return -EINVAL;
 
 	DNPRINTK(3, (KERN_INFO "[%p] eventpoll: sys_epoll_create(%d)\n",
-		     current, size));
+		     current, flags));
 
 	/*
-	 * Sanity check on the size parameter, and create the internal data
-	 * structure ( "struct eventpoll" ).
+	 * Create the internal data structure ( "struct eventpoll" ).
 	 */
-	error = -EINVAL;
-	if (size <= 0 || (error = ep_alloc(&ep)) < 0) {
+	error = ep_alloc(&ep);
+	if (error < 0) {
 		fd = error;
 		goto error_return;
 	}
···
 
 error_return:
 	DNPRINTK(3, (KERN_INFO "[%p] eventpoll: sys_epoll_create(%d) = %d\n",
-		     current, size, fd));
+		     current, flags, fd));
 
 	return fd;
 }
 
 asmlinkage long sys_epoll_create(int size)
 {
-	return sys_epoll_create2(size, 0);
+	if (size < 0)
+		return -EINVAL;
+
+	return sys_epoll_create1(0);
 }
 
 /*

include/asm-x86/unistd_32.h

···
 #define __NR_timerfd_gettime	326
 #define __NR_signalfd4		327
 #define __NR_eventfd2		328
-#define __NR_epoll_create2	329
+#define __NR_epoll_create1	329
 #define __NR_dup3		330
 #define __NR_pipe2		331
 #define __NR_inotify_init1	332

include/asm-x86/unistd_64.h

···
 __SYSCALL(__NR_signalfd4, sys_signalfd4)
 #define __NR_eventfd2				290
 __SYSCALL(__NR_eventfd2, sys_eventfd2)
-#define __NR_epoll_create2			291
-__SYSCALL(__NR_epoll_create2, sys_epoll_create2)
+#define __NR_epoll_create1			291
+__SYSCALL(__NR_epoll_create1, sys_epoll_create1)
 #define __NR_dup3				292
 __SYSCALL(__NR_dup3, sys_dup3)
 #define __NR_pipe2				293

include/linux/eventpoll.h

···
 #include <linux/fcntl.h>
 #include <linux/types.h>
 
-/* Flags for epoll_create2.  */
+/* Flags for epoll_create1.  */
 #define EPOLL_CLOEXEC O_CLOEXEC
 
 /* Valid opcodes to issue to sys_epoll_ctl() */

include/linux/syscalls.h

···
 asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp,
 			fd_set __user *exp, struct timeval __user *tvp);
 asmlinkage long sys_epoll_create(int size);
-asmlinkage long sys_epoll_create2(int size, int flags);
+asmlinkage long sys_epoll_create1(int flags);
 asmlinkage long sys_epoll_ctl(int epfd, int op, int fd,
 				struct epoll_event __user *event);
 asmlinkage long sys_epoll_wait(int epfd, struct epoll_event __user *events,