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dynamic-debug-howto: fix optional/omitted ending line number to be LARGE instead of 0 

line-range is supposed to treat "1-" as "1-endoffile", so
handle the special case by setting last_lineno to UINT_MAX.

Fixes this error:

  dynamic_debug:ddebug_parse_query: last-line:0 < 1st-line:1
  dynamic_debug:ddebug_exec_query: query parse failed

Link: http://lkml.kernel.org/r/10a6a101-e2be-209f-1f41-54637824788e@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Randy Dunlap 2017-11-17 15:27:35 -08:00 committed by Linus Torvalds
parent 8c703d6604
commit 1f3c790bd5
1 changed files with 4 additions and 0 deletions
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4
lib/dynamic_debug.c
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@ -360,6 +360,10 @@ static int ddebug_parse_query(char *words[], int nwords,
if (parse_lineno(last, &query->last_lineno) < 0) if (parse_lineno(last, &query->last_lineno) < 0)
return -EINVAL; return -EINVAL;
/* special case for last lineno not specified */
if (query->last_lineno == 0)
query->last_lineno = UINT_MAX;
if (query->last_lineno < query->first_lineno) { if (query->last_lineno < query->first_lineno) {
pr_err("last-line:%d < 1st-line:%d\n", pr_err("last-line:%d < 1st-line:%d\n",
query->last_lineno, query->last_lineno,