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authorVineet Gupta <Vineet.Gupta1@synopsys.com>2013-01-09 18:36:28 +0400
committerTony Luck <tony.luck@intel.com>2013-01-09 22:48:34 +0400
commitb6fca72536fb94098acb23c00b4e65d3bc4bb252 (patch)
tree5fec671de29e4fee7a0be6aca6e93d0acbe09a0d
parentd1c3ed669a2d452cacfb48c2d171a1f364dae2ed (diff)
downloadlinux-b6fca72536fb94098acb23c00b4e65d3bc4bb252.tar.xz
sysctl: Enable IA64 "ignore-unaligned-usertrap" to be used cross-arch
IA64 defines /proc/sys/kernel/ignore-unaligned-usertrap to control verbose warnings on unaligned access emulation. Although the exact mechanics of what to do with sysctl (ignore/shout) are arch specific, this change enables the sysctl to be usable cross-arch. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--arch/ia64/Kconfig1
-rw-r--r--init/Kconfig7
-rw-r--r--kernel/sysctl.c9
3 files changed, 15 insertions, 2 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3279646120e3..5fb10644d9ed 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -40,6 +40,7 @@ config IA64
select ARCH_THREAD_INFO_ALLOCATOR
select ARCH_CLOCKSOURCE_DATA
select GENERIC_TIME_VSYSCALL_OLD
+ select SYSCTL_ARCH_UNALIGN_NO_WARN
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
default y
diff --git a/init/Kconfig b/init/Kconfig
index 7d30240e5bfe..523bee15fb44 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1232,6 +1232,13 @@ config SYSCTL_EXCEPTION_TRACE
help
Enable support for /proc/sys/debug/exception-trace.
+config SYSCTL_ARCH_UNALIGN_NO_WARN
+ bool
+ help
+ Enable support for /proc/sys/kernel/ignore-unaligned-usertrap
+ Allows arch to define/use @no_unaligned_warning to possibly warn
+ about unaligned access emulation going on under the hood.
+
config KALLSYMS
bool "Load all symbols for debugging/ksymoops" if EXPERT
default y
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c88878db491e..840fd5eb2309 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -161,10 +161,13 @@ extern int unaligned_enabled;
#endif
#ifdef CONFIG_IA64
-extern int no_unaligned_warning;
extern int unaligned_dump_stack;
#endif
+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
+extern int no_unaligned_warning;
+#endif
+
#ifdef CONFIG_PROC_SYSCTL
static int proc_do_cad_pid(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
@@ -911,7 +914,7 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_doulongvec_minmax,
},
#endif
-#ifdef CONFIG_IA64
+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
{
.procname = "ignore-unaligned-usertrap",
.data = &no_unaligned_warning,
@@ -919,6 +922,8 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+#endif
+#ifdef CONFIG_IA64
{
.procname = "unaligned-dump-stack",
.data = &unaligned_dump_stack,