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Subject: [PATCH 3/4] x86: add kprobe-booster to X86_64
From: Harvey Harrison <harvey.harrison@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
       Jim Keniston <jkenisto@us.ibm.com>, Roland McGrath <roland@redhat.com>,
       Arjan van de Ven <arjan@infradead.org>, prasanna@in.ibm.com,
       anil.s.keshavamurthy@intel.com, davem@davemloft.net,
       systemtap-ml <systemtap@sources.redhat.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
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Date: Mon, 17 Dec 2007 14:27:44 -0800
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Sorry I missed an ifdef in this patch in the following hunk:

@@ -183,6 +185,9 @@ retry:
        }
 
        switch (opcode & 0xf0) {
+#ifdef X86_64
+       case 0x40:
+               goto retry; /* REX prefix is boostable */
        case 0x60:
                if (0x63 < opcode && opcode < 0x67)
                        goto retry; /* prefixes */

Just add the #ifdef to only catch case 0x40.

@@ -183,6 +185,10 @@ retry:
        }
 
        switch (opcode & 0xf0) {
+#ifdef X86_64
+       case 0x40:
+               goto retry; /* REX prefix is boostable */
+#endif
        case 0x60:
                if (0x63 < opcode && opcode < 0x67)
                        goto retry; /* prefixes */

Cheers,

Harvey

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