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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566// SPDX-License-Identifier: GPL-2.0#include <linux/kmsg_dump.h>#include <linux/spinlock.h>#include <linux/console.h>#include <linux/string.h>#include <shared/init.h>#include <shared/kern.h>#include <os.h>
static void kmsg_dumper_stdout(struct kmsg_dumper *dumper, struct kmsg_dump_detail *detail){ static struct kmsg_dump_iter iter; static DEFINE_SPINLOCK(lock); static char line[1024]; struct console *con; unsigned long flags; size_t len = 0; int cookie;
/* * If no consoles are available to output crash information, dump * the kmsg buffer to stdout. */
cookie = console_srcu_read_lock(); for_each_console_srcu(con) { /* * The ttynull console and disabled consoles are ignored * since they cannot output. All other consoles are * expected to output the crash information. */ if (strcmp(con->name, "ttynull") != 0 && console_is_usable(con, console_srcu_read_flags(con), true)) { break; } } console_srcu_read_unlock(cookie); if (con) return;
if (!spin_trylock_irqsave(&lock, flags)) return;
kmsg_dump_rewind(&iter);
printf("kmsg_dump:\n"); while (kmsg_dump_get_line(&iter, true, line, sizeof(line), &len)) { line[len] = '\0'; printf("%s", line); }
spin_unlock_irqrestore(&lock, flags);}
static struct kmsg_dumper kmsg_dumper = { .dump = kmsg_dumper_stdout};
static int __init kmsg_dumper_stdout_init(void){ return kmsg_dump_register(&kmsg_dumper);}
__uml_postsetup(kmsg_dumper_stdout_init);