syscall: fix 32-bit uid calls
16-bit uid calls are not always supported in newer kernels.
R=dave, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/6279047
diff --git a/src/pkg/syscall/syscall_linux_arm.go b/src/pkg/syscall/syscall_linux_arm.go
index 48b5d31..2f29079 100644
--- a/src/pkg/syscall/syscall_linux_arm.go
+++ b/src/pkg/syscall/syscall_linux_arm.go
@@ -41,26 +41,28 @@
//sys recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys sendmsg(s int, msg *Msghdr, flags int) (err error)
-//sys Chown(path string, uid int, gid int) (err error)
-//sys Fchown(fd int, uid int, gid int) (err error)
+// 64-bit file system and 32-bit uid calls
+// (16-bit uid calls are not always supported in newer kernels)
+//sys Chown(path string, uid int, gid int) (err error) = SYS_CHOWN32
+//sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
//sys Fstatfs(fd int, buf *Statfs_t) (err error) = SYS_FSTATFS64
-//sysnb Getegid() (egid int)
-//sysnb Geteuid() (euid int)
-//sysnb Getgid() (gid int)
-//sysnb Getuid() (uid int)
-//sys Lchown(path string, uid int, gid int) (err error)
+//sysnb Getegid() (egid int) = SYS_GETEGID32
+//sysnb Geteuid() (euid int) = SYS_GETEUID32
+//sysnb Getgid() (gid int) = SYS_GETGID32
+//sysnb Getuid() (uid int) = SYS_GETUID32
+//sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
//sys Listen(s int, n int) (err error)
//sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
//sys Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
-//sys Setfsgid(gid int) (err error)
-//sys Setfsuid(uid int) (err error)
-//sysnb Setgid(gid int) (err error)
-//sysnb Setregid(rgid int, egid int) (err error)
-//sysnb Setresgid(rgid int, egid int, sgid int) (err error)
-//sysnb Setresuid(ruid int, euid int, suid int) (err error)
-//sysnb Setreuid(ruid int, euid int) (err error)
+//sys Setfsgid(gid int) (err error) = SYS_SETFSGID32
+//sys Setfsuid(uid int) (err error) = SYS_SETFSUID32
+//sysnb Setgid(gid int) (err error) = SYS_SETGID32
+//sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
+//sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
+//sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
+//sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
//sys Shutdown(fd int, how int) (err error)
//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
//sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
