From: Yinghai Lu on
From: Ian Campbell <ian.campbell(a)>

This avoids an infinite loop in free_early_partial().

Add a warning to free_early_partial to catch future problems.

-v5: put back start > end back into WARN_ONCE()
-v6: use one line for if according to linus

Signed-off-by: Ian Campbell <ian.campbell(a)>
Signed-off-by: Yinghai Lu <yinghai(a)>
Cc: Peter Zijlstra <peterz(a)>
Cc: Ingo Molnar <mingo(a)>
kernel/early_res.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/early_res.c b/kernel/early_res.c
index 3cb2c66..69bed5b 100644
--- a/kernel/early_res.c
+++ b/kernel/early_res.c
@@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end)
struct early_res *r;
int i;

+ if (start == end)
+ return;
+ if (WARN_ONCE(start > end, "free_early_partial: wrong range [%#llx, %#llx]\n", start, end))
+ return;
i = find_overlapped_early(start, end);
if (i >= max_early_res)

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