[PATCH v2] dump-dmesg: Understand >= v3.11-rc4 dmesg
Lubomir Rintel
lkundrak at v3.sk
Wed Sep 18 08:19:14 EDT 2013
Symbol name changed with the following commit:
62e32ac printk: rename struct log to struct printk_log
Signed-off-by: Lubomir Rintel <lkundrak at v3.sk>
Cc: Louis Bouchard <louis.bouchard at canonical.com>
Cc: Masaki Tachibana <tachibana at mxm.nes.nec.co.jp>
Cc: Minoru Usui <usui at mxm.nes.nec.co.jp>
Cc: Daisuke Nishimura <nishimura at mxp.nes.nec.co.jp>
Cc: Atsushi Kumagai <kumagai-atsushi at mxc.nes.nec.co.jp>
---
So, the change did make it into 3.11.
Does this make sense?
Changes for v2:
* Only back values for symbol names we did actually read; either "log"
or "printk_log"
makedumpfile.c | 66 ++++++++++++++++++++++++++++++++++++++++---------------
makedumpfile.h | 5 ++-
2 files changed, 51 insertions(+), 20 deletions(-)
diff --git a/makedumpfile.c b/makedumpfile.c
index b42565c..6f00167 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -49,6 +49,7 @@ unsigned long long pfn_hwpoison;
unsigned long long num_dumped;
+int use_printk_log; /* did we read printk_log symbol name? */
int retcd = FAILED; /* return code */
#define INITIALIZE_LONG_TABLE(table, value) \
@@ -1389,10 +1390,19 @@ get_structure_info(void)
OFFSET_INIT(elf64_phdr.p_paddr, "elf64_phdr", "p_paddr");
OFFSET_INIT(elf64_phdr.p_memsz, "elf64_phdr", "p_memsz");
- SIZE_INIT(log, "log");
- OFFSET_INIT(log.ts_nsec, "log", "ts_nsec");
- OFFSET_INIT(log.len, "log", "len");
- OFFSET_INIT(log.text_len, "log", "text_len");
+ SIZE_INIT(printk_log, "printk_log");
+ if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
+ use_printk_log = 1;
+ OFFSET_INIT(printk_log.ts_nsec, "printk_log", "ts_nsec");
+ OFFSET_INIT(printk_log.len, "printk_log", "len");
+ OFFSET_INIT(printk_log.text_len, "printk_log", "text_len");
+ } else {
+ use_printk_log = 0;
+ SIZE_INIT(printk_log, "log");
+ OFFSET_INIT(printk_log.ts_nsec, "log", "ts_nsec");
+ OFFSET_INIT(printk_log.len, "log", "len");
+ OFFSET_INIT(printk_log.text_len, "log", "text_len");
+ }
return TRUE;
}
@@ -1593,7 +1603,10 @@ write_vmcoreinfo_data(void)
WRITE_STRUCTURE_SIZE("node_memblk_s", node_memblk_s);
WRITE_STRUCTURE_SIZE("nodemask_t", nodemask_t);
WRITE_STRUCTURE_SIZE("pageflags", pageflags);
- WRITE_STRUCTURE_SIZE("log", log);
+ if (use_printk_log)
+ WRITE_STRUCTURE_SIZE("printk_log", printk_log);
+ else
+ WRITE_STRUCTURE_SIZE("log", printk_log);
/*
* write the member offset of 1st kernel
@@ -1628,9 +1641,16 @@ write_vmcoreinfo_data(void)
WRITE_MEMBER_OFFSET("vm_struct.addr", vm_struct.addr);
WRITE_MEMBER_OFFSET("vmap_area.va_start", vmap_area.va_start);
WRITE_MEMBER_OFFSET("vmap_area.list", vmap_area.list);
- WRITE_MEMBER_OFFSET("log.ts_nsec", log.ts_nsec);
- WRITE_MEMBER_OFFSET("log.len", log.len);
- WRITE_MEMBER_OFFSET("log.text_len", log.text_len);
+ if (use_printk_log) {
+ WRITE_MEMBER_OFFSET("printk_log.ts_nsec", printk_log.ts_nsec);
+ WRITE_MEMBER_OFFSET("printk_log.len", printk_log.len);
+ WRITE_MEMBER_OFFSET("printk_log.text_len", printk_log.text_len);
+ } else {
+ /* Compatibility with pre-3.11-rc4 */
+ WRITE_MEMBER_OFFSET("log.ts_nsec", printk_log.ts_nsec);
+ WRITE_MEMBER_OFFSET("log.len", printk_log.len);
+ WRITE_MEMBER_OFFSET("log.text_len", printk_log.text_len);
+ }
if (SYMBOL(node_data) != NOT_FOUND_SYMBOL)
WRITE_ARRAY_LENGTH("node_data", node_data);
@@ -1909,7 +1929,6 @@ read_vmcoreinfo(void)
READ_STRUCTURE_SIZE("node_memblk_s", node_memblk_s);
READ_STRUCTURE_SIZE("nodemask_t", nodemask_t);
READ_STRUCTURE_SIZE("pageflags", pageflags);
- READ_STRUCTURE_SIZE("log", log);
READ_MEMBER_OFFSET("page.flags", page.flags);
READ_MEMBER_OFFSET("page._count", page._count);
@@ -1940,9 +1959,20 @@ read_vmcoreinfo(void)
READ_MEMBER_OFFSET("vm_struct.addr", vm_struct.addr);
READ_MEMBER_OFFSET("vmap_area.va_start", vmap_area.va_start);
READ_MEMBER_OFFSET("vmap_area.list", vmap_area.list);
- READ_MEMBER_OFFSET("log.ts_nsec", log.ts_nsec);
- READ_MEMBER_OFFSET("log.len", log.len);
- READ_MEMBER_OFFSET("log.text_len", log.text_len);
+
+ READ_STRUCTURE_SIZE("printk_log", printk_log);
+ if (SIZE(printk_log) != NOT_FOUND_STRUCTURE) {
+ use_printk_log = 1;
+ READ_MEMBER_OFFSET("printk_log.ts_nsec", printk_log.ts_nsec);
+ READ_MEMBER_OFFSET("printk_log.len", printk_log.len);
+ READ_MEMBER_OFFSET("printk_log.text_len", printk_log.text_len);
+ } else {
+ use_printk_log = 0;
+ READ_STRUCTURE_SIZE("log", printk_log);
+ READ_MEMBER_OFFSET("log.ts_nsec", printk_log.ts_nsec);
+ READ_MEMBER_OFFSET("log.len", printk_log.len);
+ READ_MEMBER_OFFSET("log.text_len", printk_log.text_len);
+ }
READ_ARRAY_LENGTH("node_data", node_data);
READ_ARRAY_LENGTH("pgdat_list", pgdat_list);
@@ -3705,13 +3735,13 @@ dump_log_entry(char *logptr, int fp)
ulonglong nanos;
ulong rem;
- text_len = USHORT(logptr + OFFSET(log.text_len));
- ts_nsec = ULONGLONG(logptr + OFFSET(log.ts_nsec));
+ text_len = USHORT(logptr + OFFSET(printk_log.text_len));
+ ts_nsec = ULONGLONG(logptr + OFFSET(printk_log.ts_nsec));
nanos = (ulonglong)ts_nsec / (ulonglong)1000000000;
rem = (ulonglong)ts_nsec % (ulonglong)1000000000;
- msg = logptr + SIZE(log);
+ msg = logptr + SIZE(printk_log);
sprintf(buf, "[%5lld.%06ld] ", nanos, rem/1000);
@@ -3749,7 +3779,7 @@ log_from_idx(unsigned int idx, char *logbuf)
* the buffer.
*/
- msglen = USHORT(logptr + OFFSET(log.len));
+ msglen = USHORT(logptr + OFFSET(printk_log.len));
if (!msglen)
logptr = logbuf;
@@ -3770,9 +3800,9 @@ log_next(unsigned int idx, char *logbuf)
* return the one after that.
*/
- msglen = USHORT(logptr + OFFSET(log.len));
+ msglen = USHORT(logptr + OFFSET(printk_log.len));
if (!msglen) {
- msglen = USHORT(logbuf + OFFSET(log.len));
+ msglen = USHORT(logbuf + OFFSET(printk_log.len));
return msglen;
}
diff --git a/makedumpfile.h b/makedumpfile.h
index a5826e0..c33852a 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -1198,6 +1198,7 @@ struct size_table {
long cpumask_t;
long kexec_segment;
long elf64_hdr;
+ long printk_log;
long log;
long pageflags;
@@ -1337,11 +1338,11 @@ struct offset_table {
long p_memsz;
} elf64_phdr;
- struct log_s {
+ struct printk_log_s {
long ts_nsec;
long len;
long text_len;
- } log;
+ } printk_log;
};
--
1.7.1
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