path: root/kernel
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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 08:53:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 08:53:20 -0700
commitc3d1f1746b966907ba5ad2f75ddca24db8b21147 (patch)
tree548a25e104d8bdb906030b8d3bf78fbfde0e5817 /kernel
parent66eddbfcc1f6610fa7c73c8d20a57eaf8e284e2f (diff)
parent0d365753d0b7c26043fdfa97790411606fb40112 (diff)
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: (150 commits) MIPS: PowerTV: Separate PowerTV USB support from non-USB code MIPS: strip the un-needed sections of vmlinuz MIPS: Clean up the calculation of VMLINUZ_LOAD_ADDRESS MIPS: Clean up arch/mips/boot/compressed/decompress.c MIPS: Clean up arch/mips/boot/compressed/ld.script MIPS: Unify the suffix of compressed vmlinux.bin MIPS: PowerTV: Add Gaia platform definitions. MIPS: BCM47xx: Fix nvram_getenv return value. MIPS: Octeon: Allow more than 3.75GB of memory with PCIe MIPS: Clean up notify_die() usage. MIPS: Remove unused task_struct.trap_no field. Documentation: Mention that KProbes is supported on MIPS SAMPLES: kprobe_example: Make it print something on MIPS. MIPS: kprobe: Add support. MIPS: Add instrunction format for BREAK and SYSCALL MIPS: kprobes: Define regs_return_value() MIPS: Ritually kill stupid printk. MIPS: Octeon: Disallow MSI-X interrupt and fall back to MSI interrupts. MIPS: Octeon: Support 256 MSI on PCIe MIPS: Decode core number for R2 CPUs. ...
Diffstat (limited to 'kernel')
1 files changed, 31 insertions, 2 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 444b770c959..4ab0164bcf8 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -37,6 +37,8 @@
#include <linux/ratelimit.h>
#include <linux/kmsg_dump.h>
#include <linux/syslog.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
#include <asm/uaccess.h>
@@ -985,6 +987,32 @@ void resume_console(void)
+ * console_cpu_notify - print deferred console messages after CPU hotplug
+ * @self: notifier struct
+ * @action: CPU hotplug event
+ * @hcpu: unused
+ *
+ * If printk() is called from a CPU that is not online yet, the messages
+ * will be spooled but will not show up on the console. This function is
+ * called when a new CPU comes online (or fails to come up), and ensures
+ * that any such output gets printed.
+ */
+static int __cpuinit console_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ case CPU_DYING:
+ acquire_console_sem();
+ release_console_sem();
+ }
+ return NOTIFY_OK;
* acquire_console_sem - lock the console system for exclusive use.
* Acquires a semaphore which guarantees that the caller has
@@ -1371,7 +1399,7 @@ int unregister_console(struct console *console)
-static int __init disable_boot_consoles(void)
+static int __init printk_late_init(void)
struct console *con;
@@ -1382,9 +1410,10 @@ static int __init disable_boot_consoles(void)
+ hotcpu_notifier(console_cpu_notify, 0);
return 0;
#if defined CONFIG_PRINTK