On Mon, Nov 11, 2024 at 12:59:47PM +0100, Peter Zijlstra wrote: > Since there is only a single fastop() function, convert the FASTOP > stuff from CALL_NOSPEC+RET to JMP_NOSPEC+JMP, avoiding the return > thunks and all that jazz. > > Specifically FASTOPs rely on the return thunk to preserve EFLAGS, > which not all of them can trivially do (call depth tracing suffers > here). > > Objtool strenuously complains about this: > > - indirect call without a .rodata, fails to determine JUMP_TABLE, > annotate > - fastop functions fall through, exception > - unreachable instruction after fastop_return, save/restore This wording makes it sound like this patch triggers objtool warnings, which I'm guessing is not true? -- Josh
