libbpf-tools/softirqs: Fix logarithmic calculation issue

Should use log2l. When there is a function call, R1 unbounded memory access problem occurs, so inline is used. Signed-off-by: Feng Yang <[email protected]>
iovisor · Feb 7, 2025 · 6cade19 · 6cade19
1 parent 3896116
commit 6cade19
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/libbpf-tools/softirqs.bpf.c b/libbpf-tools/softirqs.bpf.c
@@ -41,7 +41,7 @@ static int handle_entry(unsigned int vec_nr)
 	return 0;
 }
 
-static int handle_exit(unsigned int vec_nr)
+static __always_inline int handle_exit(unsigned int vec_nr)
 {
 	if (!is_target_cpu())
 		return 0;
@@ -66,7 +66,7 @@ static int handle_exit(unsigned int vec_nr)
 		u64 slot;
 
 		hist = &hists[vec_nr];
-		slot = log2(delta);
+		slot = log2l(delta);
 		if (slot >= MAX_SLOTS)
 			slot = MAX_SLOTS - 1;
 		__sync_fetch_and_add(&hist->slots[slot], 1);