ACPI: Reevaluate whether the T-state is supported or not after cpu is online/offline

[~andy/linux] / kernel / printk.c

diff --git a/kernel/printk.c b/kernel/printk.c
index 38e7d5868d60ccdfc8f13176f6021a4a712cdee1..a23315dc4498844c113cecc9792eabd063e1d87b 100644 (file)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -274,7 +274,20 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
        char c;
        int error = 0;
 
-       error = security_syslog(type, from_file);
+       /*
+        * If this is from /proc/kmsg we only do the capabilities checks
+        * at open time.
+        */
+       if (type == SYSLOG_ACTION_OPEN || !from_file) {
+               if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
+                       return -EPERM;
+               if ((type != SYSLOG_ACTION_READ_ALL &&
+                    type != SYSLOG_ACTION_SIZE_BUFFER) &&
+                   !capable(CAP_SYS_ADMIN))
+                       return -EPERM;
+       }
+
+       error = security_syslog(type);
        if (error)
                return error;
 
@@ -1069,13 +1082,15 @@ void printk_tick(void)
 
 int printk_needs_cpu(int cpu)
 {
+       if (unlikely(cpu_is_offline(cpu)))
+               printk_tick();
        return per_cpu(printk_pending, cpu);
 }
 
 void wake_up_klogd(void)
 {
        if (waitqueue_active(&log_wait))
-               __raw_get_cpu_var(printk_pending) = 1;
+               this_cpu_write(printk_pending, 1);
 }
 
 /**