diff options
Diffstat (limited to 'drivers/char/ramoops.c')
| -rw-r--r-- | drivers/char/ramoops.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c index 73dcb0ee41f..1a9f5f6d6ac 100644 --- a/drivers/char/ramoops.c +++ b/drivers/char/ramoops.c @@ -29,9 +29,8 @@ #include <linux/ramoops.h> #define RAMOOPS_KERNMSG_HDR "====" -#define RAMOOPS_HEADER_SIZE (5 + sizeof(struct timeval)) -#define RECORD_SIZE 4096 +#define RECORD_SIZE 4096UL static ulong mem_address; module_param(mem_address, ulong, 0400); @@ -65,15 +64,22 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper, struct ramoops_context, dump); unsigned long s1_start, s2_start; unsigned long l1_cpy, l2_cpy; - int res; - char *buf; + int res, hdr_size; + char *buf, *buf_orig; struct timeval timestamp; + if (reason != KMSG_DUMP_OOPS && + reason != KMSG_DUMP_PANIC && + reason != KMSG_DUMP_KEXEC) + return; + /* Only dump oopses if dump_oops is set */ if (reason == KMSG_DUMP_OOPS && !dump_oops) return; - buf = (char *)(cxt->virt_addr + (cxt->count * RECORD_SIZE)); + buf = cxt->virt_addr + (cxt->count * RECORD_SIZE); + buf_orig = buf; + memset(buf, '\0', RECORD_SIZE); res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR); buf += res; @@ -81,8 +87,9 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper, res = sprintf(buf, "%lu.%lu\n", (long)timestamp.tv_sec, (long)timestamp.tv_usec); buf += res; - l2_cpy = min(l2, (unsigned long)(RECORD_SIZE - RAMOOPS_HEADER_SIZE)); - l1_cpy = min(l1, (unsigned long)(RECORD_SIZE - RAMOOPS_HEADER_SIZE) - l2_cpy); + hdr_size = buf - buf_orig; + l2_cpy = min(l2, RECORD_SIZE - hdr_size); + l1_cpy = min(l1, RECORD_SIZE - hdr_size - l2_cpy); s2_start = l2 - l2_cpy; s1_start = l1 - l1_cpy; |