internal/poll,syscall: drop the fallback for accept4 on linux/arm

For #67001

Change-Id: Ic0b91cd393046c53e41908e8dbbe2ab5fb6b8a74
Reviewed-on: https://go-review.googlesource.com/c/go/+/588216
Reviewed-by: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: David Chase <[email protected]>
Reviewed-by: Tobias Klauser <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>

Author: panjf2000

src/internal/poll/sock_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements accept for platforms that provide a fast path for
 // setting SetNonblock and CloseOnExec.
 
-//go:build dragonfly || freebsd || (linux && !arm) || netbsd || openbsd
+//go:build dragonfly || freebsd || linux || netbsd || openbsd
 
 package poll
 

src/internal/poll/sock_cloexec_accept.go

@@ -190,7 +190,7 @@ linux_amd64)
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 linux_arm)
-	GOOSARCH_in="syscall_linux_arm.go syscall_linux_accept.go"
+	GOOSARCH_in="syscall_linux_arm.go"
 	mkerrors="$mkerrors"
 	mksyscall="./mksyscall.pl -l32 -arm"
 	mksysnum="curl -s 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/arm/include/uapi/asm/unistd.h' | ./mksysnum_linux.pl -"

src/syscall/mkall.sh

@@ -682,6 +682,10 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
 	return nil, EAFNOSUPPORT
 }
 
+func Accept(fd int) (nfd int, sa Sockaddr, err error) {
+	return Accept4(fd, 0)
+}
+
 func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
 	var rsa RawSockaddrAny
 	var len _Socklen = SizeofSockaddrAny