Per the code, -r(LIST_HEAD_REVERSE) only work with LIST_HEAD_FORMAT
which is set by -H or -h.
Previously, if LIST_HEAD_FORMAT was not set, `list -r` will traverse the
list in order, that doesn't obey the -r(reverse) semantics.
Add a further check to ensure -r is used in conjunction with -H or -h.
Signed-off-by: Li Zhijian <lizhij...@fujitsu.com>
---
help.c | 3 ++-
tools.c | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/help.c b/help.c
index d80e843703c1..6f7e093cbef1 100644
--- a/help.c
+++ b/help.c
@@ -5977,7 +5977,8 @@ char *help__list[] = {
" ",
" -x Override the default output format with hexadecimal format.",
" -d Override the default output format with decimal format.",
-" -r For a list linked with list_head structures, traverse the
list",
+" -r Must be used in conjunction with either -H or -h.",
+" For a list linked with list_head structures, traverse the
list",
" in the reverse order by using the \"prev\" pointer instead",
" of \"next\".",
" -B Use the algorithm from R. P. Brent to detect loops instead of",
diff --git a/tools.c b/tools.c
index 0f2db108838a..67977605c276 100644
--- a/tools.c
+++ b/tools.c
@@ -3451,6 +3451,9 @@ cmd_list(void)
}
}
+ if (ld->flags & LIST_HEAD_REVERSE && !(ld->flags & LIST_HEAD_FORMAT))
+ error(FATAL, "-r must be used in conjunction with -H or -h\n");
+
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
--
2.29.2
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