I added this on top of your patch to make it compile (and look a little nicer).
With that, bptest worked nicely.
---
arch/i386/kernel/kprobes.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
Index: b/arch/i386/kernel/kprobes.c
===================================================================
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -35,6 +35,7 @@
#include <asm/cacheflush.h>
#include <asm/desc.h>
#include <asm/uaccess.h>
+#include <asm/debugreg.h>
void jprobe_return_end(void);
@@ -660,16 +661,16 @@ int __kprobes kprobe_exceptions_notify(s
ret = NOTIFY_STOP;
break;
case DIE_DEBUG:
-
- /* The DR6 value is stored in args->err */
-#define DR6 (args->err)
-
- if ((DR6 & DR_STEP) && post_kprobe_handler(args->regs)) {
- if ((DR6 & ~DR_STEP) == 0)
- ret = NOTIFY_STOP;
- }
+ /*
+ * The %db6 value is stored in args->err.
+ * If DR_STEP is the only bit set and it's ours,
+ * we should eat this exception.
+ */
+ if ((args->err & DR_STEP) &&
+ post_kprobe_handler(args->regs) &&
+ (args->err & ~DR_STEP) == 0)
+ ret = NOTIFY_STOP;
break;
-#undef DR6
case DIE_GPF:
case DIE_PAGE_FAULT:
-
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