linux-brain/arch/xtensa
Christian Brauner d68dbb0c9a
arch: handle arches who do not yet define clone3
This cleanly handles arches who do not yet define clone3.

clone3() was initially placed under __ARCH_WANT_SYS_CLONE under the
assumption that this would cleanly handle all architectures. It does
not.
Architectures such as nios2 or h8300 simply take the asm-generic syscall
definitions and generate their syscall table from it. Since they don't
define __ARCH_WANT_SYS_CLONE the build would fail complaining about
sys_clone3 missing. The reason this doesn't happen for legacy clone is
that nios2 and h8300 provide assembly stubs for sys_clone. This seems to
be done for architectural reasons.

The build failures for nios2 and h8300 were caught int -next luckily.
The solution is to define __ARCH_WANT_SYS_CLONE3 that architectures can
add. Additionally, we need a cond_syscall(clone3) for architectures such
as nios2 or h8300 that generate their syscall table in the way I
explained above.

Fixes: 8f3220a806 ("arch: wire-up clone3() syscall")
Signed-off-by: Christian Brauner <christian@brauner.io>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Adrian Reber <adrian@lisas.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: linux-api@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: x86@kernel.org
2019-06-21 01:54:53 +02:00
..
boot treewide: prefix header search paths with $(srctree)/ 2019-05-18 11:49:57 +09:00
configs xtensa: rename BUILTIN_DTB to BUILTIN_DTB_SOURCE 2019-01-26 02:02:16 -08:00
include arch: handle arches who do not yet define clone3 2019-06-21 01:54:53 +02:00
kernel arch: wire-up clone3() syscall 2019-06-09 09:29:46 +02:00
lib xtensa: replace variant/core.h with asm/core.h 2019-05-06 17:48:55 -07:00
mm init: provide a generic free_initmem implementation 2019-05-14 09:47:47 -07:00
oprofile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
platforms One more patch to remove io.h from clk-provider.h. We used to need this 2019-05-16 19:05:35 -07:00
variants xtensa: add test_kc705_be variant 2018-08-20 12:34:45 -07:00
Kconfig Xtensa updates for v5.2: 2019-05-11 10:27:34 -04:00
Kconfig.debug Kconfig: consolidate the "Kernel hacking" menu 2018-08-02 08:06:48 +09:00
Makefile xtensa: generate uapi header and syscall table header files 2018-12-02 23:45:41 -08:00