div64: Don't instrument the division function
This function may be called from tracing code, since that code needs to
read the timer and this often requires calling do_div(), which calls
__div64_32(). If this function is instrumented it causes an infinite loop,
since emitting a trace record requests the time, which in turn emits a
trace record, etc.
Update the prototype to prevent instrumentation code being added.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/div64.c b/lib/div64.c
index 7abc68c..62933c9 100644
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -25,7 +25,13 @@
#if BITS_PER_LONG == 32
#ifndef __div64_32
-u32 __attribute__((weak)) __div64_32(u64 *n, u32 base)
+/*
+ * Don't instrument this function as it may be called from tracing code, since
+ * it needs to read the timer and this often requires calling do_div(), which
+ * calls this function.
+ */
+uint32_t __attribute__((weak, no_instrument_function)) __div64_32(u64 *n,
+ u32 base)
{
u64 rem = *n;
u64 b = base;