10 Aug, 2010
1 commit
-
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
05 Aug, 2010
1 commit
-
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
21 May, 2010
2 commits
-
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 -
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
07 Mar, 2010
1 commit
-
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
01 Mar, 2010
1 commit
04 Feb, 2010
2 commits
-
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 -
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
25 Jan, 2010
1 commit
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* 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
01 Jan, 2010
1 commit
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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
18 Dec, 2009
1 commit
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Fix kernel-doc warnings in printk.c:
Warning(kernel/printk.c:1422): No description found for parameter 'dumper'
Warning(kernel/printk.c:1422): Excess function parameter 'dump' description in 'kmsg_dump_register'
Warning(kernel/printk.c:1451): No description found for parameter 'dumper'
Warning(kernel/printk.c:1451): Excess function parameter 'dump' description in 'kmsg_dump_unregister'Signed-off-by: Randy Dunlap
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Dec, 2009
1 commit
-
* git://git.infradead.org/mtd-2.6: (90 commits)
jffs2: Fix long-standing bug with symlink garbage collection.
mtd: OneNAND: Fix test of unsigned in onenand_otp_walk()
mtd: cfi_cmdset_0002, fix lock imbalance
Revert "mtd: move mxcnd_remove to .exit.text"
mtd: m25p80: add support for Macronix MX25L4005A
kmsg_dump: fix build for CONFIG_PRINTK=n
mtd: nandsim: add support for 4KiB pages
mtd: mtdoops: refactor as a kmsg_dumper
mtd: mtdoops: make record size configurable
mtd: mtdoops: limit the maximum mtd partition size
mtd: mtdoops: keep track of used/unused pages in an array
mtd: mtdoops: several minor cleanups
core: Add kernel message dumper to call on oopses and panics
mtd: add ARM pismo support
mtd: pxa3xx_nand: Fix PIO data transfer
mtd: nand: fix multi-chip suspend problem
mtd: add support for switching old SST chips into QRY mode
mtd: fix M29W800D dev_id and uaddr
mtd: don't use PF_MEMALLOC
mtd: Add bad block table overrides to Davinci NAND driver
...Fixed up conflicts (mostly trivial) in
drivers/mtd/devices/m25p80.c
drivers/mtd/maps/pcmciamtd.c
drivers/mtd/nand/pxa3xx_nand.c
kernel/printk.c
06 Dec, 2009
1 commit
-
…l/git/tip/linux-2.6-tip
* 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
ratelimit: Make suppressed output messages more useful
printk: Remove ratelimit.h from kernel.h
ratelimit: Fix/allow use in atomic contexts
ratelimit: Use per ratelimit context locking
02 Dec, 2009
1 commit
-
kmsg_dump() fails to build when CONFIG_PRINTK=n; provide stubs
for the kmsg_dump*() functions when CONFIG_PRINTK=n.kernel/printk.c: In function 'kmsg_dump':
kernel/printk.c:1501: error: 'log_buf_len' undeclared (first use in this function)
kernel/printk.c:1502: error: 'logged_chars' undeclared (first use in this function)
kernel/printk.c:1506: error: 'log_buf' undeclared (first use in this function)Signed-off-by: Randy Dunlap
Acked-by: Simon Kagstrom
Signed-off-by: David Woodhouse
30 Nov, 2009
1 commit
-
The core functionality is implemented as per Linus suggestion from
http://lists.infradead.org/pipermail/linux-mtd/2009-October/027620.html
(with the kmsg_dump implementation by Linus). A struct kmsg_dumper has
been added which contains a callback to dump the kernel log buffers on
crashes. The kmsg_dump function gets called from oops_exit() and panic()
and invokes this callbacks with the crash reason.[dwmw2: Fix log_end handling]
Signed-off-by: Simon Kagstrom
Reviewed-by: Anders Grafstrom
Reviewed-by: Linus Torvalds
Acked-by: Ingo Molnar
Signed-off-by: Artem Bityutskiy
Signed-off-by: David Woodhouse
23 Oct, 2009
1 commit
-
Today I got:
[39648.224782] Registered led device: iwl-phy0::TX
[40676.545099] __ratelimit: 246 callbacks suppressed
[40676.545103] abcdef[23675]: segfault at 0 ...as you can see the ratelimit message contains a function prefix.
Since this is always __ratelimit, this wont help much.This patch changes __ratelimit and printk_ratelimit to print the
function name that calls ratelimit.This will pinpoint the responsible function, as long as not several
different places call ratelimit with the same ratelimit state at
the same time. In that case we catch only one random function that
calls ratelimit after the wait period.Signed-off-by: Christian Borntraeger
Cc: Dave Young
Cc: Linus Torvalds
CC: Andrew Morton
LKML-Reference:
Signed-off-by: Ingo Molnar
23 Sep, 2009
2 commits
-
When syslog is not possible, at the same time there's no serial/net
console available, it will be hard to read the printk messages. For
example oops/panic/warning messages in shutdown phase.Add a printk delay feature, we can make each printk message delay some
milliseconds.Setting the delay by proc/sysctl interface: /proc/sys/kernel/printk_delay
The value range from 0 - 10000, default value is 0
[akpm@linux-foundation.org: fix a few things]
Signed-off-by: Dave Young
Acked-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Rename `printk_delay_msec' to `loops_per_msec', because the patch "printk:
add printk_delay to make messages readable for some scenarios" wishes to
more appropriately use the `printk_delay_msec' identifier.[akpm@linux-foundation.org: add a comment]
Signed-off-by: Dave Young
Acked-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
22 Sep, 2009
1 commit
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Decouple kernel.h from ratelimit.h: the global declaration of
printk's ratelimit_state is not needed, and it leads to messy
circular dependencies due to ratelimit.h's (new) adding of a
spinlock_types.h include.Cc: Peter Zijlstra
Cc: Andrew Morton
Cc: Linus Torvalds
Cc: David S. Miller
LKML-Reference:
Signed-off-by: Ingo Molnar
15 Sep, 2009
1 commit
-
console_print() is an old legacy interface mostly unused in the entire
kernel tree. It's best to clean up its existing use and let developers
use their own implementation of it as they feel fit.Signed-off-by: Anirban Sinha
Signed-off-by: Linus Torvalds
09 Aug, 2009
1 commit
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Don't return when we find the first bootconsole - it can leave
other bootconsoles still installed, and they can be used and
cause problems later (if they are in the init section, and
eventually released), and cause problems. Make sure we remove
all of them.Signed-off-by: Sonic Zhang
Signed-off-by: Robin Getz
Signed-off-by: Andrew Morton
Signed-off-by: Ingo Molnar
10 Jul, 2009
2 commits
-
When logging to console is disabled from userspace using klogctl()
and later re-enabled, console_loglevel gets set to the default
log level instead to the previous value.This means that if the kernel was booted with 'quiet', the boot is
suddenly no longer quiet after logging to console gets re-enabled.Save the current console_loglevel when logging is disabled and
restore to that value. If the log level is set to a specific value
while disabled, this is interpreted as an implicit re-enabling of
the logging.The problem that prompted this patch is described in:
http://lkml.org/lkml/2009/6/28/234
There are two variations possible on the patch below:
1) If klogctl(7) is called while logging is not disabled, then set level
to default (partially preserving current functionality):
case 7: /* Enable logging to console */
- console_loglevel = default_console_loglevel;
+ if (saved_console_loglevel == -1)
+ console_loglevel = default_console_loglevel;
+ else {
+ console_loglevel = saved_console_loglevel;
+ saved_console_loglevel = -1;
+ }2) If klogctl(8) is called while logging is disabled, then don't enable
logging, but remember the requested value for when logging does get
enabled again:
case 8: /* Set level of messages printed to console */
[...]
- console_loglevel = len;
+ if (saved_console_loglevel == -1)
+ console_loglevel = len;
+ else
+ saved_console_loglevel = len;Yet another option would be to ignore the request.
Signed-off-by: Frans Pop
Cc: cryptsetup@packages.debian.org
Cc: Andrew Morton
Cc: Linus Torvalds
LKML-Reference:
Signed-off-by: Ingo Molnar -
Today, when a console is registered without CON_PRINTBUFFER,
end users never see the announcement of it being added, and
never know if they missed something, if the console is really
at the start or not, and just leads to general confusion.This re-orders existing code, to make sure the console is
added, before the "console [%s%d] enabled" is printed out -
ensuring that this message is _always_ seen.This has the desired/intended side effect of making sure that
"console enabled:" messages are printed on the bootconsole, and
the real console. This does cause the same line is printed
twice if the bootconsole and real console are the same device,
but if they are on different devices, the message is printed to
both consoles.Signed-off-by : Robin Getz
Cc: "Andrew Morton"
Cc: "Linus Torvalds"
LKML-Reference:
Signed-off-by: Ingo Molnar
03 Jul, 2009
1 commit
-
Today, register_console() assumes the following usage:
- The first console to register with a flag set to CON_BOOT
is the one and only bootconsole.- If another register_console() is called with an additional
CON_BOOT, it is silently rejected.- As soon as a console without the CON_BOOT set calls
registers the bootconsole is automatically unregistered.- Once there is a "real" console - register_console() will
silently reject any consoles with it's CON_BOOT flag set.In many systems (alpha, blackfin, microblaze, mips, powerpc,
sh, & x86), there are early_printk implementations, which use
the CON_BOOT which come out serial ports, vga, usb, & memory
buffers.In many embedded systems, it would be nice to have two
bootconsoles - in case the primary fails, you always have
access to a backup memory buffer - but this requires at least
two CON_BOOT consoles...This patch enables that functionality.
With the change applied, on boot you get (if you try to
re-enable a boot console after the "real" console has been
registered):root:/> dmesg | grep console
bootconsole [early_shadow0] enabled
bootconsole [early_BFuart0] enabled
Kernel command line: root=/dev/mtdblock0 rw earlyprintk=serial,uart0,57600 console=ttyBF0,57600 nmi_debug=regs
console handover:boot [early_BFuart0] boot [early_shadow0] -> real [ttyBF0]
Too late to register bootconsole early_shadow0or:
root:/> dmesg | grep console
Kernel command line: root=/dev/mtdblock0 rw console=ttyBF0,57600
console [ttyBF0] enabledSigned-off-by: Robin Getz
Cc: "Linus Torvalds"
Cc: "Andrew Morton"
Cc: "Mike Frysinger"
Cc: "Paul Mundt"
LKML-Reference:
Signed-off-by: Ingo Molnar
17 Jun, 2009
2 commits
-
This adds a KERN_DEFAULT loglevel marker, for when you cannot decide
which loglevel you want, and just want to keep an existing printk
with the default loglevel.The difference between having KERN_DEFAULT and having no log-level
marker at all is two-fold:- having the log-level marker will now force a new-line if the
previous printout had not added one (perhaps because it forgot,
but perhaps because it expected a continuation)- having a log-level marker is required if you are printing out a
message that otherwise itself could perhaps otherwise be mistaken
for a log-level.Signed-of-by: Linus Torvalds
-
It used to be that we would only look at the log-level in a printk()
after explicit newlines, which can cause annoying problems when the
previous printk() did not end with a '\n'. In that case, the log-level
marker would be just printed out in the middle of the line, and be
seen as just noise rather than change the logging level.This changes things to always look at the log-level in the first
bytes of the printout. If a log level marker is found, it is always
used as the log-level. Additionally, if no newline existed, one is
added (unless the log-level is the explicit KERN_CONT marker, to
explicitly show that it's a continuation of a previous line).Acked-by: Arjan van de Ven
Signed-off-by: Linus Torvalds
06 Apr, 2009
1 commit
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* 'printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
printk: correct the behavior of printk_timed_ratelimit()
vsprintf: unify the format decoding layer for its 3 users, cleanup
fix regression from "vsprintf: unify the format decoding layer for its 3 users"
vsprintf: fix bug in negative value printing
vsprintf: unify the format decoding layer for its 3 users
vsprintf: add binary printf
printk: introduce printk_once()Fix trivial conflicts (printk_once vs log_buf_kexec_setup() added near
each other) in include/linux/kernel.h.
03 Apr, 2009
1 commit
-
It would be nice to be able to extract the dmesg log from a vmcore file
without needing to keep the debug symbols for the running kernel handy all
the time. We have a facility to do this in /proc/vmcore. This patch adds
the log_buf and log_end symbols to the vmcoreinfo area so that tools (like
makedumpfile) can easily extract the dmesg logs from a vmcore image.[akpm@linux-foundation.org: several fixes and cleanups]
[akpm@linux-foundation.org: fix unused log_buf_kexec_setup()]
[akpm@linux-foundation.org: build fix]
Signed-off-by: Neil Horman
Cc: Simon Horman
Acked-by: Vivek Goyal
Cc: Neil Horman
Cc: Simon Horman
Cc: Vivek Goyal
Cc: Randy Dunlap
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Mar, 2009
1 commit
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Impact: fix jiffies-comparison sign-wrap behavior
The behavior provided by printk_timed_ratelimit() is, in some
situations, probably not what a caller would reasonably expect:bool printk_timed_ratelimit(unsigned long *caller_jiffies,
unsigned int interval_msecs)
{
if (*caller_jiffies == 0 || time_after(jiffies, *caller_jiffies)) {
*caller_jiffies = jiffies + msecs_to_jiffies(interval_msecs);
return true;
}
return false;
}On a 32 bit computer, if printk_timed_ratelimit() is initially called at
time jiffies == Ja, *caller_jiffies is set to
Ja + msecs_to_jiffies(interval_msecs): let's say Ja + 42 for this
example.If this caller then doesn't call printk_timed_ratelimit() until
jiffies == Ja + (1 << 31) + 42 (which can happen as soon as ~ 25 days
later on a 1000 HZ system), printk_timed_ratelimit() will then always
return false to this caller until jiffies loops completely (1 << 31 more
ticks).Ths change makes it only return false if jiffies is in the small
time window starting at the previous call when true was returned and
ending interval_msecs later. Note that if jiffies loops completely
between two calls to printk_timed_ratelimit(), it will obviously still
wrongly return false, but this is something with a low probability.If something completely reliable is needed I guess jiffies_64 must be
used (which this change does not do).Signed-off-by: Guillaume Knispel
Cc: Ulrich Drepper
Cc: Rusty Russell
Cc: Andrew Morton
Cc: Linus Torvalds
LKML-Reference:
Signed-off-by: Ingo Molnar
22 Feb, 2009
1 commit
-
This fixes a race where a thread acquires the console while the
console is suspended, and the console is resumed before this
thread releases it. In this case, the secondary console
semaphore would be left locked, and the primary semaphore would
be released twice. This in turn would cause the console switch
on suspend or resume to hang forever.Note that suspend_console does not actually lock the console
for clients that use acquire_console_sem, it only locks it for
clients that use try_acquire_console_sem. If we change
suspend_console to fully lock the console, then the kernel
may deadlock on suspend. One client of try_acquire_console_sem
is acquire_console_semaphore_for_printk, which uses it to
prevent printk from using the console while it is suspended.Signed-off-by: Arve Hjønnevåg
Signed-off-by: Rafael J. Wysocki
Cc: Len Brown
Cc: Greg KH
Signed-off-by: Linus Torvalds
14 Jan, 2009
2 commits
-
Signed-off-by: Heiko Carstens
-
Remove the -ENOSYS implementation for !CONFIG_PRINTK and use
the cond_syscall infrastructure instead.Acked-by: Kyle McMartin
Signed-off-by: Heiko Carstens
06 Jan, 2009
1 commit
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Remove bogus indentation of new_text_line declaration introduced in
commit ac60ad741.Acked-by: Nick Andrew
Signed-off-by: Jiri Kosina
20 Dec, 2008
1 commit
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Impact: fix truncated recursion bug message printout
When recursion_bug is true, kernel discards original message because printk_buf
contains recursion_bug_msg with NULL terminator. The sizeof(recursion_bug_msg)
makes this, use strlen() to get correct length without NULL terminator.Reported-by: Toshikazu Nakayama
Signed-off-by: Hiroshi Shimamoto
Signed-off-by: Ingo Molnar
24 Oct, 2008
1 commit
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both log_buf_copy() and log_buf_len are unused.
Signed-off-by: Ingo Molnar
17 Oct, 2008
3 commits
-
* 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
do_generic_file_read: s/EINTR/EIO/ if lock_page_killable() fails
softirq, warning fix: correct a format to avoid a warning
softirqs, debug: preemption check
x86, pci-hotplug, calgary / rio: fix EBDA ioremap()
IO resources, x86: ioremap sanity check to catch mapping requests exceeding, fix
IO resources, x86: ioremap sanity check to catch mapping requests exceeding the BAR sizes
softlockup: Documentation/sysctl/kernel.txt: fix softlockup_thresh description
dmi scan: warn about too early calls to dmi_check_system()
generic: redefine resource_size_t as phys_addr_t
generic: make PFN_PHYS explicitly return phys_addr_t
generic: add phys_addr_t for holding physical addresses
softirq: allocate less vectors
IO resources: fix/remove printk
printk: robustify printk, update comment
printk: robustify printk, fix #2
printk: robustify printk, fix
printk: robustify printkFixed up conflicts in:
arch/powerpc/include/asm/types.h
arch/powerpc/platforms/Kconfig.cputype
manually. -
Add documentation in kerneldoc for new printk format extensions
This patch documents the new %pS/%pF options in printk in kernel doc.
Hope I didn't miss any other extension.
Signed-off-by: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
People can use the real name an an index into MAINTAINERS to find the
current email address.Signed-off-by: Francois Cami
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
15 Oct, 2008
1 commit
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…' and 'core/misc' into core-v28-for-linus
14 Oct, 2008
1 commit
-
This is pure tty code so put it in the tty layer where it can be with the
locking relevant material it usesSigned-off-by: Alan Cox
Signed-off-by: Linus Torvalds
