The patch titled
Subject: reboot: hide from sysfs not applicable settings
has been added to the -mm tree. Its filename is
reboot-hide-from-sysfs-not-applicable-settings.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/reboot-hide-from-sysfs-not-applicable-settings.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/reboot-hide-from-sysfs-not-applicable-settings.patch
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------------------------------------------------------
From: Matteo Croce <mcroce@xxxxxxxxxxxxx>
Subject: reboot: hide from sysfs not applicable settings
Not all the reboot settings from both the kernel command line or sysfs
interface are available to all platforms.
Filter out reboot_type and reboot_force which are x86 only, and also
remove reboot_cpu on kernels without SMP support.
This saves some space, and avoid confusing the user with settings which
will have no effect.
Link: https://lkml.kernel.org/r/20201130173717.198952-3-mcroce@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Matteo Croce <mcroce@xxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/reboot.c | 54 ++++++++++++++++++++++++++--------------------
1 file changed, 31 insertions(+), 23 deletions(-)
--- a/kernel/reboot.c~reboot-hide-from-sysfs-not-applicable-settings
+++ a/kernel/reboot.c
@@ -666,6 +666,29 @@ static ssize_t mode_store(struct kobject
}
static struct kobj_attribute reboot_mode_attr = __ATTR_RW(mode);
+#ifdef CONFIG_X86
+static ssize_t force_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", reboot_force);
+}
+static ssize_t force_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ bool res;
+
+ if (!capable(CAP_SYS_BOOT))
+ return -EPERM;
+
+ if (kstrtobool(buf, &res))
+ return -EINVAL;
+
+ reboot_default = 0;
+ reboot_force = res;
+
+ return count;
+}
+static struct kobj_attribute reboot_force_attr = __ATTR_RW(force);
+
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
const char *val;
@@ -721,7 +744,9 @@ static ssize_t type_store(struct kobject
return count;
}
static struct kobj_attribute reboot_type_attr = __ATTR_RW(type);
+#endif
+#ifdef CONFIG_SMP
static ssize_t cpu_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", reboot_cpu);
@@ -749,34 +774,17 @@ static ssize_t cpu_store(struct kobject
return count;
}
static struct kobj_attribute reboot_cpu_attr = __ATTR_RW(cpu);
-
-static ssize_t force_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-{
- return sprintf(buf, "%d\n", reboot_force);
-}
-static ssize_t force_store(struct kobject *kobj, struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- bool res;
-
- if (!capable(CAP_SYS_BOOT))
- return -EPERM;
-
- if (kstrtobool(buf, &res))
- return -EINVAL;
-
- reboot_default = 0;
- reboot_force = res;
-
- return count;
-}
-static struct kobj_attribute reboot_force_attr = __ATTR_RW(force);
+#endif
static struct attribute *reboot_attrs[] = {
&reboot_mode_attr.attr,
+#ifdef CONFIG_X86
+ &reboot_force_attr.attr,
&reboot_type_attr.attr,
+#endif
+#ifdef CONFIG_SMP
&reboot_cpu_attr.attr,
- &reboot_force_attr.attr,
+#endif
NULL,
};
_
Patches currently in -mm which might be from mcroce@xxxxxxxxxxxxx are
reboot-refactor-and-comment-the-cpu-selection-code.patch
reboot-allow-to-specify-reboot-mode-via-sysfs.patch
reboot-remove-cf9_safe-from-allowed-types-and-rename-cf9_force.patch
reboot-allow-to-override-reboot-type-if-quirks-are-found.patch
reboot-hide-from-sysfs-not-applicable-settings.patch
