lguest: update commentry

Every so often, after code shuffles, I need to go through and unbitrot
the Lguest Journey (see drivers/lguest/README).  Since we now use RCU in
a simple form in one place I took the opportunity to expand that explanation.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/lguest/i386_head.S b/arch/x86/lguest/i386_head.S
index db6aa95eb054..27eac0faee48 100644
--- a/arch/x86/lguest/i386_head.S
+++ b/arch/x86/lguest/i386_head.S
@@ -102,6 +102,7 @@ send_interrupts:
          * create one manually here.
          */
         .byte 0x0f,0x01,0xc1 /* KVM_HYPERCALL */
+        /* Put eax back the way we found it. */
         popl %eax
         ret
 
@@ -125,6 +126,7 @@ ENTRY(lg_restore_fl)
         jnz send_interrupts
         /* Again, the normal path has used no extra registers.  Clever, huh? */
         ret
+/*:*/
 
 /* These demark the EIP range where host should never deliver interrupts. */
 .global lguest_noirq_start