[PATCH] i386: PARAVIRT: Remove CONFIG_DEBUG_PARAVIRT

Remove CONFIG_DEBUG_PARAVIRT.  When inlining code, this option
attempts to trash registers in the patch-site's "clobber" field, on
the grounds that this should find bugs with incorrect clobbers.
Unfortunately, the clobber field really means "registers modified by
this patch site", which includes return values.

Because of this, this option has outlived its usefulness, so remove
it.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 1 insertions, 13 deletions

diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index 9b8e85a8edec..915b6c4d9baf 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -334,19 +334,7 @@ void apply_paravirt(struct paravirt_patch *start, struct paravirt_patch *end)
 
                 used = paravirt_ops.patch(p->instrtype, p->clobbers, p->instr,
                                           p->len);
-#ifdef CONFIG_DEBUG_PARAVIRT
-                {
-                int i;
-                /* Deliberately clobber regs using "not %reg" to find bugs. */
-                for (i = 0; i < 3; i++) {
-                        if (p->len - used >= 2 && (p->clobbers & (1 << i))) {
-                                memcpy(p->instr + used, "\xf7\xd0", 2);
-                                p->instr[used+1] |= i;
-                                used += 2;
-                        }
-                }
-                }
-#endif
+
                 /* Pad the rest with nops */
                 nop_out(p->instr + used, p->len - used);
         }