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fs: add do_eventfd() helper; remove internal call to sys_eventfd() 

Using this helper removes an in-kernel call to the sys_eventfd() syscall.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2018-03-11 11:34:37 +01:00
parent 52fb6db0fd
commit 2fc96f8331
1 changed files with 8 additions and 3 deletions
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11
fs/eventfd.c
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@ -380,7 +380,7 @@ struct eventfd_ctx *eventfd_ctx_fileget(struct file *file)
} }
EXPORT_SYMBOL_GPL(eventfd_ctx_fileget); EXPORT_SYMBOL_GPL(eventfd_ctx_fileget);
SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags) static int do_eventfd(unsigned int count, int flags)
{ {
struct eventfd_ctx *ctx; struct eventfd_ctx *ctx;
int fd; int fd;
@ -409,8 +409,13 @@ SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)
return fd; return fd;
} }
SYSCALL_DEFINE1(eventfd, unsigned int, count) SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)
{ {
return sys_eventfd2(count, 0); return do_eventfd(count, flags);
}
SYSCALL_DEFINE1(eventfd, unsigned int, count)
{
return do_eventfd(count, 0);
} }