• Josh Poimboeuf's avatar
    objtool: Add support for alternatives at the end of a section · 17bc3391
    Josh Poimboeuf authored
    Now that the previous patch gave objtool the ability to read retpoline
    alternatives, it shows a new warning:
    
      arch/x86/entry/entry_64.o: warning: objtool: .entry_trampoline: don't know how to handle alternatives at end of section
    
    This is due to the JMP_NOSPEC in entry_SYSCALL_64_trampoline().
    
    Previously, objtool ignored this situation because it wasn't needed, and
    it would have required a bit of extra code.  Now that this case exists,
    add proper support for it.
    Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Guenter Roeck <linux@roeck-us.net>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/2a30a3c2158af47d891a76e69bb1ef347e0443fd.1517284349.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    17bc3391
check.c 48.1 KB