On Wed, Jun 24, 2020 at 02:45:30PM -0700, Sami Tolvanen wrote: > On Wed, Jun 24, 2020 at 11:27:37PM +0200, Peter Zijlstra wrote: > > On Wed, Jun 24, 2020 at 01:31:42PM -0700, Sami Tolvanen wrote: > > > With LTO, LLVM bitcode won't be compiled into native code until > > > modpost_link. This change postpones calls to recordmcount until after > > > this step. > > > > > > In order to exclude specific functions from inspection, we add a new > > > code section .text..nomcount, which we tell recordmcount to ignore, and > > > a __nomcount attribute for moving functions to this section. > > > > I'm confused, you only add this to functions in ftrace itself, which is > > compiled with: > > > > KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS)) > > > > and so should not have mcount/fentry sites anyway. So what's the point > > of ignoring them further? > > > > This Changelog does not explain. > > Normally, recordmcount ignores each ftrace.o file, but since we are > running it on vmlinux.o, we need another way to stop it from looking > at references to mcount/fentry that are not calls. Here's a comment > from recordmcount.c: > > /* > * The file kernel/trace/ftrace.o references the mcount > * function but does not call it. Since ftrace.o should > * not be traced anyway, we just skip it. > */ > > But I agree, the commit message could use more defails. Also +Steven > for thoughts about this approach. Ah, is thi because recordmcount isn't smart enough to know the difference between "CALL $mcount" and any other RELA that has mcount? At least for x86_64 I can do a really quick take for a recordmcount pass in objtool, but I suppose you also need this for ARM64 ?
