x86/alternatives: Disable interrupts and sync when optimizing NOPs in place

apply_alternatives() treats alternatives with the ALT_FLAG_NOT flag set
special as it optimizes the existing NOPs in place.

Unfortunately this happens with interrupts enabled and does not provide any
form of core synchronization.

So an interrupt hitting in the middle of the update and using the affected
code path will observe a half updated NOP and crash and burn. The following
3 NOP sequence was observed to expose this crash halfways reliably under
QEMU 32bit:

   0x90 0x90 0x90

which is replaced by the optimized 3 byte NOP:

   0x8d 0x76 0x00

So an interrupt can observe:

   1) 0x90 0x90 0x90		nop nop nop
   2) 0x8d 0x90 0x90		undefined
   3) 0x8d 0x76 0x90		lea    -0x70(%esi),%esi
   4) 0x8d 0x76 0x00		lea     0x0(%esi),%esi

Where only #1 and #4 are true NOPs. The same problem exists for 64bit obviously.

Disable interrupts around this NOP optimization and invoke sync_core()
before reenabling them.

Fixes: 270a69c4 ("x86/alternative: Support relocations in alternatives")
Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>