x86/alternatives: Add macro comments

... so that when one stares at the .s output, one can find her way
around the resulting asm magic.

With it, ALTERNATIVE looks like this now:

          # ALT: oldnstr
  661:
          ...
  662:
          # ALT: padding
  .skip ...
  663:
  .pushsection .altinstructions,"a"

  ...

  .popsection
  .pushsection .altinstr_replacement, "ax"
          # ALT: replacement 1
  6641:
  	...
  6651:
          .popsection

Merge __OLDINSTR() into OLDINSTR(), while at it.

No functional changes.

Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: X86 ML <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

0 files changed, 0 insertions, 0 deletions