Re: Random panic in load_balance() with 3.16-rc

Frank Ch. Eigler
2014-07-28T12:28:36Z

torvalds wrote:

> [...]
> Actually, I prefer my patch that did it with cc-option checking, and
> does it unconditionally.
>
> Because if we do it even for non-debug builds - where it ostensibly
> shouldn't matter - we then have that GCC_COMPARE_DEBUG thing working
> regardless of configuration.

Please note that the data produced by "-g -fvar-tracking" is consumed
by tools like systemtap, perf, crash, and makes a significant
difference to the observability of debug AND non-debug kernels. (The
presence of compiled-in DEBUG_* self-checking code is orthogonal to
kernel observability via debuginfo.) Please consider only disabling
var-tracking optionally/temporarily to work around this already-fixed
compiler bug, but not losing high-quality dwarf data permanently.

- FChE