Hi!

On Fri, Sep 12, 2025 at 10:37:34AM +0200, Christophe Leroy wrote:

 BEGIN_FTR_SECTION
+	lwarx   r0,0,r1
+END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
 	stwcx.	r0,0,r1		/* to clear the reservation */
-FTR_SECTION_ELSE
-	lwarx	r0,0,r1
-ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)

Hrm.  So this is for V'ger (mpc7450)?  What kind of issues does that
old thing have with unpaired larx/stcx., some performance impact?

The extra "dummy" larx has serious performance impact itself, on most
implementations (also on all newer stuff).


Segher