linux/kernel/printk.c, branch v2.6.36

gcc-4.6: printk: use stable variable to dump kmsg buffer

2010-08-10T03:45:06Z

kmsg_dump takes care to sample the global variables inside a spinlock, but then goes on to use the same variables outside the spinlock region too. Use the correct variable. This will make the race window smaller. Found by gcc 4.6's new warnings. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

printk: fix delayed messages from CPU hotplug events

2010-08-05T12:25:59Z

When a secondary CPU is being brought up, it is not uncommon for printk() to be invoked when cpu_online(smp_processor_id()) == 0. The case that I witnessed personally was on MIPS: http://lkml.org/lkml/2010/5/30/4 If (can_use_console() == 0), printk() will spool its output to log_buf and it will be visible in "dmesg", but that output will NOT be echoed to the console until somebody calls release_console_sem() from a CPU that is online. Therefore, the boot time messages from the new CPU can get stuck in "limbo" for a long time, and might suddenly appear on the screen when a completely unrelated event (e.g. "eth0: link is down") occurs. This patch modifies the console code so that any pending messages are automatically flushed out to the console whenever a CPU hotplug operation completes successfully or aborts. The issue was seen on 2.6.34. Original patch by Kevin Cernekee with cleanups by akpm and additional fixes by Santosh Shilimkar. This patch superseeds https://patchwork.linux-mips.org/patch/1357/. Signed-off-by: Kevin Cernekee To: To: To: To: To: Cc: Cc: Reviewed-by: Paul Mundt Signed-off-by: Kevin Cernekee Patchwork: https://patchwork.linux-mips.org/patch/1534/ LKML-Reference: LKML-Reference: Signed-off-by: Ralf Baechle

printk,kdb: capture printk() when in kdb shell

2010-05-21T02:04:27Z

Certain calls from the kdb shell will call out to printk(), and any of these calls should get vectored back to the kdb_printf() so that the kdb pager and processing can be used, as well as to properly channel I/O to the polled I/O devices. CC: Randy Dunlap Signed-off-by: Jason Wessel Acked-by: Andrew Morton

kdb: core for kgdb back end (2 of 2)

2010-05-21T02:04:21Z

This patch contains the hooks and instrumentation into kernel which live outside the kernel/debug directory, which the kdb core will call to run commands like lsmod, dmesg, bt etc... CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel Signed-off-by: Martin Hicks

printk: avoid warning when CONFIG_PRINTK is disabled

2010-03-06T19:26:33Z

kernel/printk.c:72: warning: `saved_console_loglevel' defined but not used Signed-off-by: Gustavo F. Padovan Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'next' into for-linus

2010-02-28T22:36:31Z

syslog: use defined constants instead of raw numbers

2010-02-04T03:20:41Z

Right now the syslog "type" action are just raw numbers which makes the source difficult to follow. This patch replaces the raw numbers with defined constants for some level of sanity. Signed-off-by: Kees Cook Acked-by: John Johansen Acked-by: Serge Hallyn Signed-off-by: James Morris

syslog: distinguish between /proc/kmsg and syscalls

2010-02-04T03:20:12Z

This allows the LSM to distinguish between syslog functions originating from /proc/kmsg access and direct syscalls. By default, the commoncaps will now no longer require CAP_SYS_ADMIN to read an opened /proc/kmsg file descriptor. For example the kernel syslog reader can now drop privileges after opening /proc/kmsg, instead of staying privileged with CAP_SYS_ADMIN. MAC systems that implement security_syslog have unchanged behavior. Signed-off-by: Kees Cook Acked-by: Serge Hallyn Acked-by: John Johansen Signed-off-by: James Morris

Merge git://git.infradead.org/~dwmw2/mtd-2.6.33

2010-01-24T18:31:34Z

* git://git.infradead.org/~dwmw2/mtd-2.6.33: mtd: tests: fix read, speed and stress tests on NOR flash mtd: Really add ARM pismo support kmsg_dump: Dump on crash_kexec as well

kmsg_dump: Dump on crash_kexec as well

2009-12-31T19:45:04Z

crash_kexec gets called before kmsg_dump(KMSG_DUMP_OOPS) if panic_on_oops is set, so the kernel log buffer is not stored for this case. This patch adds a KMSG_DUMP_KEXEC dump type which gets called when crash_kexec() is invoked. To avoid getting double dumps, the old KMSG_DUMP_PANIC is moved below crash_kexec(). The mtdoops driver is modified to handle KMSG_DUMP_KEXEC in the same way as a panic. Signed-off-by: KOSAKI Motohiro Acked-by: Simon Kagstrom Signed-off-by: David Woodhouse