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sysctl: Enable IA64 "ignore-unaligned-usertrap" to be used cross-arch

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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>
This commit is contained in:
Vineet Gupta 2013-01-09 20:06:28 +05:30 committed by Tony Luck
parent d1c3ed669a
commit b6fca72536
3 changed files with 15 additions and 2 deletions
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1
arch/ia64/Kconfig
View File

@ -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

7
init/Kconfig
View File

@ -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

9
kernel/sysctl.c
View File

@ -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,