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author | Thomas Meyer <thomas@m3y3r.de> | 2015-03-28 10:07:37 +0100 |
---|---|---|
committer | Richard Weinberger <richard@nod.at> | 2015-04-13 21:17:37 +0200 |
commit | 04a418495e0852263d77c4fb82adf470feaafef3 (patch) | |
tree | 55101ddcf7076f7f90a4957b3cdaed946289ccd7 /arch/um/kernel/um_arch.c | |
parent | x86, UML: fix integer overflow in ELF_ET_DYN_BASE (diff) | |
download | linux-04a418495e0852263d77c4fb82adf470feaafef3.tar.xz linux-04a418495e0852263d77c4fb82adf470feaafef3.zip |
um: add a kmsg_dumper
Add a kmsg_dumper, that dumps the kmsg buffer to stdout, when no console
is available. This an enables the printing of early panic() calls
triggered in uml_postsetup().
When a panic() call happens so early in the UML kernel no
earlyprintk/console is available yet, but with a kmsg_dumper in place
the kernel message buffer will be outputted to the user, to give a
better hint, of what the failure was.
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/kernel/um_arch.c')
-rw-r--r-- | arch/um/kernel/um_arch.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 9b06957e98ce..926ecdceba86 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -11,6 +11,7 @@ #include <linux/string.h> #include <linux/utsname.h> #include <linux/sched.h> +#include <linux/kmsg_dump.h> #include <asm/pgtable.h> #include <asm/processor.h> #include <asm/sections.h> @@ -211,6 +212,7 @@ static void __init uml_postsetup(void) static int panic_exit(struct notifier_block *self, unsigned long unused1, void *unused2) { + kmsg_dump(KMSG_DUMP_PANIC); bust_spinlocks(1); bust_spinlocks(0); uml_exitcode = 1; |