Re: [PATCH v2 3/8] objtool: stack validation 2.0

[Ingo Molnar]

* Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:

> This is a major rewrite of objtool.  Instead of only tracking frame
> pointer changes, it now tracks all stack-related operations, including
> all register saves/restores.
> 
> In addition to making stack validation more robust, this also paves the
> way for undwarf generation.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

Note, I have applied the first 3 patches, and got a bunch of new warnings on x86 
64-bit allmodconfig:

 arch/x86/kernel/alternative.o: warning: objtool: do_sync_core()+0x1b: unsupported instruction in callable function
 arch/x86/kernel/alternative.o: warning: objtool: text_poke()+0x1a8: unsupported instruction in callable function
 arch/x86/kernel/ftrace.o: warning: objtool: do_sync_core()+0x16: unsupported instruction in callable function
 arch/x86/kernel/cpu/mcheck/mce.o: warning: objtool: machine_check_poll()+0x166: unsupported instruction in callable function
 arch/x86/kernel/cpu/mcheck/mce.o: warning: objtool: do_machine_check()+0x147: unsupported instruction in callable function

(That's the vmlinux build - plus 4 more warnings in the modules build.)

That's with GCC 5.3.1.

Let me know if you need any more info.

Thanks,

	Ingo