On Tue, Aug 29, 2023 at 03:20:37PM -0700, Linus Torvalds wrote: > On Mon, 28 Aug 2023 at 22:54, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > > > Linus, please pull mm.git's non-MM updates for this cycle. > > Hmm. For some non-obvious (to me) reason this triggers > > vmlinux.o: warning: objtool: ibt_selftest+0x18: sibling call from > callable instruction with modified stack frame > > which didn't happen before, even though the pull doesn't actually > change that file at all. > > I see that Josh has a patch to fix this by making it be real assembly > code rather than a hacky inline asm in a C file, but it's a bit > surprising, and I don't see why it's triggered now when it wasn't > before. > > At a guess it's related to the Kconfig changes, but I have nothing to > back that guess up with. > > Slightly annoying, but I guess I'll live with the warning for now. As far as I can tell this warning only shows up with the rare combination of CONFIG_X86_KERNEL_IBT and CONFIG_UNWINDER_FRAME_POINTER (the latter being pretty much deprecated at this point). Did you manage to enable frame pointers somehow? The fix (to rewrite the IBT selftest) was merged into tip/x86/shstk. Presumably it'll be in a pull request soon-ish. -- Josh
