Re: [PATCH v4 04/29] objtool: Add a pass for generating __mcount_loc
From: Miroslav Benes <mbenes@suse.cz>
Date: 2020-10-01 13:17:18
Also in:
linux-arch, linux-kbuild, linux-pci, lkml
Hi Sami, On Tue, 29 Sep 2020, Sami Tolvanen wrote:
From: Peter Zijlstra <peterz@infradead.org> Add the --mcount option for generating __mcount_loc sections needed for dynamic ftrace. Using this pass requires the kernel to be compiled with -mfentry and CC_USING_NOP_MCOUNT to be defined in Makefile. Link: https://lore.kernel.org/lkml/20200625200235.GQ4781@hirez.programming.kicks-ass.net/ (local) Signed-off-by: Peter Zijlstra <peterz@infradead.org> [Sami: rebased to mainline, dropped config changes, fixed to actually use --mcount, and wrote a commit message.] Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <redacted>
I am sorry to reply on v4. Should have been sooner. Julien has been sending patches to make objtool's check functionality arch-agnostic as much as possible. So it seems to me that the patch should be based on the effort I also wonder about making 'mcount' command separate from 'check'. Similar to what is 'orc' now. But that could be done later. See tip-tree/objtool/core for both. Thanks Miroslav _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel