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net: socket: add __sys_recvfrom() helper; remove in-kernel call to syscall

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Using the net-internal helper __sys_recvfrom() allows us to avoid the
internal calls to the sys_recvfrom() 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: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
2018-03-13 19:10:06 +01:00
parent b51d3cdf44
commit 7a09e1eb9c
3 changed files with 21 additions and 9 deletions
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3
net/compat.c
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@@ -760,7 +760,8 @@ COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len
unsigned int, flags, struct sockaddr __user *, addr,
int __user *, addrlen)
{
return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
addrlen);
}
COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,