[patch 11/20] x86, ds: fix bounds check in ds selftest

[markus.t.metzger@intel.com]

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Fix a bad bounds check in the debug store selftest.


Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---
 arch/x86/kernel/ds_selftest.c |    7 	6 +	1 -	0 !
 1 file changed, 6 insertions(+), 1 deletion(-)

Index: b/arch/x86/kernel/ds_selftest.c
===================================================================
--- a/arch/x86/kernel/ds_selftest.c
+++ b/arch/x86/kernel/ds_selftest.c
@@ -47,8 +47,13 @@ static int ds_selftest_bts_consistency(c
 		printk(KERN_CONT "bad bts buffer setup...");
 		error = -1;
 	}
+	/*
+	 * We allow top in [begin; end], since its not clear when the
+	 * overflow adjustment happens: after the increment or before the
+	 * write.
+	 */
 	if ((trace->ds.top < trace->ds.begin) ||
-	    (trace->ds.end <= trace->ds.top)) {
+	    (trace->ds.end < trace->ds.top)) {
 		printk(KERN_CONT "bts top out of bounds...");
 		error = -1;
 	}

-- 

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