arm64 fixes for 4.3-rc6

- Fix module CFLAGS setting in workaround for erratum #843419
 - Update MINSIGSTKSZ and SIGSTKSZ to match glibc
 - Wire up some new compat syscalls
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQEcBAABCgAGBQJWHl+mAAoJELescNyEwWM0UUEH/if7AeWriEIJD6Fdgvft4bLn
 NNojsj0kq1b4m1LCydqNXiz4Vf2xdjNcuR8Ap5h3wbgG0h8rSvwXV9XDPeeZHlU/
 CGPgLjrzSSsF1idw8Z37NHj0wm7yAgbsJjBI9Zrbnkm8ZExRKXUTHJCn0dUtDAc3
 OYpgBgKaYqxqd4Lr+ZOw/OIkiqdvshTRrOYl2ai5yH8CvN3qdSNPanLwO5Z5hidQ
 iP655RlEDUDIKZQGp5sPp8zLEdqgluuzHm5nmF1/D+7jHwJABLHD+YLuPzHk1wgn
 ihk+2vN/7ok+qawaekVHliy5ySuGZMCS15YIHnSMk7K+AKP4fHYk1GOdzx0xuIA=
 =hw5U
 -----END PGP SIGNATURE-----

Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "Here are a few more arm64 fixes for 4.3.  Again, nothing too
  significant, but worth having nonetheless.  The MINSIGSTKSZ update is
  a bit grotty, but the value we currently have is wrong (too small), so
  anybody using that will have issues already.  It has Arnd's ack for
  the asm-generic change.

  Summary:

   - Fix module CFLAGS setting in workaround for erratum #843419
   - Update MINSIGSTKSZ and SIGSTKSZ to match glibc
   - Wire up some new compat syscalls"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: compat: wire up new syscalls
  arm64: Fix MINSIGSTKSZ and SIGSTKSZ
  arm64: errata: use KBUILD_CFLAGS_MODULE for erratum #843419

arch/arm64/Makefile

@@ -42,7 +42,7 @@ endif
 CHECKFLAGS	+= -D__aarch64__
 
 ifeq ($(CONFIG_ARM64_ERRATUM_843419), y)
-CFLAGS_MODULE	+= -mcmodel=large
+KBUILD_CFLAGS_MODULE	+= -mcmodel=large
 endif
 
 # Default value

arch/arm64/include/asm/unistd.h

@@ -44,7 +44,7 @@
 #define __ARM_NR_compat_cacheflush	(__ARM_NR_COMPAT_BASE+2)
 #define __ARM_NR_compat_set_tls		(__ARM_NR_COMPAT_BASE+5)
 
-#define __NR_compat_syscalls		388
+#define __NR_compat_syscalls		390
 #endif
 
 #define __ARCH_WANT_SYS_CLONE

arch/arm64/include/asm/unistd32.h

@@ -797,3 +797,12 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create)
 __SYSCALL(__NR_bpf, sys_bpf)
 #define __NR_execveat 387
 __SYSCALL(__NR_execveat, compat_sys_execveat)
+#define __NR_userfaultfd 388
+__SYSCALL(__NR_userfaultfd, sys_userfaultfd)
+#define __NR_membarrier 389
+__SYSCALL(__NR_membarrier, sys_membarrier)
+
+/*
+ * Please add new compat syscalls above this comment and update
+ * __NR_compat_syscalls in asm/unistd.h.
+ */

arch/arm64/include/uapi/asm/signal.h

@@ -19,6 +19,9 @@
 /* Required for AArch32 compatibility. */
 #define SA_RESTORER	0x04000000
 
+#define MINSIGSTKSZ 5120
+#define SIGSTKSZ    16384
+
 #include <asm-generic/signal.h>
 
 #endif

include/uapi/asm-generic/signal.h

@@ -80,8 +80,10 @@
  *	SA_RESTORER	0x04000000
  */
 
+#if !defined MINSIGSTKSZ || !defined SIGSTKSZ
 #define MINSIGSTKSZ	2048
 #define SIGSTKSZ	8192
+#endif
 
 #ifndef __ASSEMBLY__
 typedef struct {