sysctl: Enable PARISC "unaligned-trap" to be used cross-arch

PARISC defines /proc/sys/kernel/unaligned-trap to runtime toggle
unaligned access emulation.

The exact mechanics of enablig/disabling are still arch specific, we can
make the sysctl usable by other arches.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index be8b7f55312d..01180da49add 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1232,6 +1232,14 @@ config SYSCTL_EXCEPTION_TRACE
         help
           Enable support for /proc/sys/debug/exception-trace.
 
+config SYSCTL_ARCH_UNALIGN_ALLOW
+        bool
+        help
+          Enable support for /proc/sys/kernel/unaligned-trap
+          Allows arches to define/use @unaligned_enabled to runtime toggle
+          the unaligned access emulation.
+          see arch/parisc/kernel/unaligned.c for reference
+
 config KALLSYMS
          bool "Load all symbols for debugging/ksymoops" if EXPERT
          default y