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Subject[RESEND PATCH] sysctl: Enable PARISC "unaligned-trap" to be used cross-arch
Date
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>
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>
---
arch/parisc/Kconfig | 1 +
init/Kconfig | 8 ++++++++
kernel/sysctl.c | 7 ++++++-
3 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index b77feff..8c76095 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -20,6 +20,7 @@ config PARISC
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
+ select SYSCTL_ARCH_UNALIGN_ALLOW
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS
diff --git a/init/Kconfig b/init/Kconfig
index e188f9f..e64bb18 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1240,6 +1240,14 @@ config SYSCTL_ARCH_UNALIGN_NO_WARN
unaligned access emulation going on under the hood.
see arch/ia64/kernel/unaligned.c for reference

+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
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 840fd5e..c4cd655 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -157,13 +157,16 @@ extern int sysctl_tsb_ratio;

#ifdef __hppa__
extern int pwrsw_enabled;
-extern int unaligned_enabled;
#endif

#ifdef CONFIG_IA64
extern int unaligned_dump_stack;
#endif

+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
+extern int unaligned_enabled;
+#endif
+
#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
extern int no_unaligned_warning;
#endif
@@ -548,6 +551,8 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+#endif
+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
{
.procname = "unaligned-trap",
.data = &unaligned_enabled,
--
1.7.4.1


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