log: edit inline assembly

just read the note on osdev wiki that stated that input operands
shouldn't be changed, so we move both rax and the console lock to the
output operands so the compiler knows we are modifying them for our
lovely optimisation

1 files changed, 1 insertions, 1 deletions

diff --git a/init/log.c b/init/log.c
index 2df6d82..4fe748e 100644
--- a/init/log.c
+++ b/init/log.c
@@ -42,7 +42,7 @@ retry:
         ;
 
     asm("mov %0, 1\n\t"
-        "xchg %0, %1" : "=r" (rax) : "m" (console_lock));
+        "xchg %0, %1" : "=r" (rax), "=m" (console_lock));
 
     if(rax)
         goto retry;