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>
This commit is contained in:
Simon Glass 2019-04-08 13:20:49 -06:00
parent ca49b2c6e2
commit f611a46ef1

View File

@ -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;