[PATCH v3] arm64: Synchronise dump_backtrace() with perf callchain
catalin.marinas at arm.com
Mon Oct 19 11:02:15 PDT 2015
On Sat, Oct 17, 2015 at 02:28:11PM +0000, Jungseok Lee wrote:
> Note that this patch does not cover a case where MMU is disabled. The
> last stack frame of swapper, for example, has PC in a form of physical
> address. Unfortunately, a simple conversion using phys_to_virt() cannot
> cover all scenarios since PC is retrieved from LR - 4, not LR. It is
> a big tradeoff to change both head.S and unwind_frame() for only a few
> of symbols in *.S. Thus, this hunk does not take care of the case.
That's fine, I think we can cope with a physical address as the last
entry in the trace.
Patch queued for 4.4. Thanks.
More information about the linux-arm-kernel