Doug / smarc-fsl-linux-kernel

06 Mar, 2012

1 commit

  • c22ab3329   kmsg_dump: don't run on non-error paths by default ... Browse Code »

    Since commit 04c6862c055f ("kmsg_dump: add kmsg_dump() calls to the
    reboot, halt, poweroff and emergency_restart paths"), kmsg_dump() gets
    run on normal paths including poweroff and reboot.

    This is less than ideal given pstore implementations that can only
    represent single backtraces, since a reboot may overwrite a stored oops
    before it's been picked up by userspace. In addition, some pstore
    backends may have low performance and provide a significant delay in
    reboot as a result.

    This patch adds a printk.always_kmsg_dump kernel parameter (which can also
    be changed from userspace). Without it, the code will only be run on
    failure paths rather than on normal paths. The option can be enabled in
    environments where there's a desire to attempt to audit whether or not a
    reboot was cleanly requested or not.

    Signed-off-by: Matthew Garrett
    Acked-by: Seiji Aguchi
    Cc: Seiji Aguchi
    Cc: David Woodhouse
    Cc: Marco Stornelli
    Cc: Artem Bityutskiy
    Cc: KOSAKI Motohiro
    Cc: Vivek Goyal
    Cc: Don Zickus
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Matthew Garrett
     

13 Jan, 2012

1 commit

  • a3dd33230   kexec: remove KMSG_DUMP_KEXEC ... Browse Code »

    KMSG_DUMP_KEXEC is useless because we already save kernel messages inside
    /proc/vmcore, and it is unsafe to allow modules to do other stuffs in a
    crash dump scenario.

    [akpm@linux-foundation.org: fix powerpc build]
    Signed-off-by: WANG Cong
    Reported-by: Vivek Goyal
    Acked-by: Vivek Goyal
    Acked-by: Jarod Wilson
    Cc: "Eric W. Biederman"
    Cc: KOSAKI Motohiro
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    WANG Cong
     

16 Jun, 2011

1 commit

  • ac5622418   kmsg_dump.h: fix build when CONFIG_PRINTK is disabled ... Browse Code »

    Fix when CONFIG_PRINTK is not enabled:

    include/linux/kmsg_dump.h:56: error: 'EINVAL' undeclared (first use in this function)
    include/linux/kmsg_dump.h:61: error: 'EINVAL' undeclared (first use in this function)

    Looks like commit 595dd3d8bf95 ("kmsg_dump: fix build for
    CONFIG_PRINTK=n") uses EINVAL without having the needed header file(s),
    but I'm sure that I build tested that patch also. oh well.

    Signed-off-by: Randy Dunlap
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Randy Dunlap
     

14 Jan, 2011

1 commit

  • 04c6862c0   kmsg_dump: add kmsg_dump() calls to the reboot, halt, poweroff and emergency_restart paths ... Browse Code »

    We need to know the reason why system rebooted in support service.
    However, we can't inform our customers of the reason because final
    messages are lost on current Linux kernel.

    This patch improves the situation above because the final messages are
    saved by adding kmsg_dump() to reboot, halt, poweroff and
    emergency_restart path.

    Signed-off-by: Seiji Aguchi
    Cc: David Woodhouse
    Cc: Marco Stornelli
    Reviewed-by: Artem Bityutskiy
    Reviewed-by: KOSAKI Motohiro
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Seiji Aguchi
     

01 Jan, 2010

1 commit

  • 0f4bd46ec   kmsg_dump: Dump on crash_kexec as well ... Browse Code »

    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

    KOSAKI Motohiro
     

02 Dec, 2009

1 commit

  • 595dd3d8b   kmsg_dump: fix build for CONFIG_PRINTK=n ... Browse Code »

    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

    Randy Dunlap
     

30 Nov, 2009

1 commit

  • 456b565cc   core: Add kernel message dumper to call on oopses and panics ... Browse Code »

    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

    Simon Kagstrom