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* [dpdk-dev] [PATCH] ivshmem: fix overlap detection code
@ 2016-05-24 12:50 Anatoly Burakov
  2016-05-24 12:52 ` Burakov, Anatoly
  0 siblings, 1 reply; 4+ messages in thread
From: Anatoly Burakov @ 2016-05-24 12:50 UTC (permalink / raw)
  To: dev

Partial revert of an earlier ill-conceived "fix".
Adjacent segments can never be considered overlapping because we
are not comparing ends to starts, but rather starts to starts.
Therefore the earlier fix was wrong (plus it also had a typo).

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/linuxapp/eal/eal_ivshmem.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_ivshmem.c b/lib/librte_eal/linuxapp/eal/eal_ivshmem.c
index 07aec69..eea0314 100644
--- a/lib/librte_eal/linuxapp/eal/eal_ivshmem.c
+++ b/lib/librte_eal/linuxapp/eal/eal_ivshmem.c
@@ -184,21 +184,21 @@ overlap(const struct rte_memzone * mz1, const struct rte_memzone * mz2)
 	i_end2 = mz2->ioremap_addr + mz2->len;
 
 	/* check for overlap in virtual addresses */
-	if (start1 > start2 && start1 < end2)
+	if (start1 >= start2 && start1 < end2)
 		result |= VIRT;
 	if (start2 >= start1 && start2 < end1)
 		result |= VIRT;
 
 	/* check for overlap in physical addresses */
-	if (p_start1 > p_start2 && p_start1 < p_end2)
+	if (p_start1 >= p_start2 && p_start1 < p_end2)
 		result |= PHYS;
-	if (p_start2 > p_start1 && p_start2 < p_end1)
+	if (p_start2 >= p_start1 && p_start2 < p_end1)
 		result |= PHYS;
 
 	/* check for overlap in ioremap addresses */
-	if (i_start1 > i_start2 && i_start1 < i_end2)
+	if (i_start1 >= i_start2 && i_start1 < i_end2)
 		result |= IOREMAP;
-	if (i_start2 > i_start1 && i_start2 < i_end1)
+	if (i_start2 >= i_start1 && i_start2 < i_end1)
 		result |= IOREMAP;
 
 	return result;
-- 
2.5.5

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2016-06-07 10:03 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-05-24 12:50 [dpdk-dev] [PATCH] ivshmem: fix overlap detection code Anatoly Burakov
2016-05-24 12:52 ` Burakov, Anatoly
2016-05-24 18:31   ` Ferruh Yigit
2016-06-07 10:03     ` Thomas Monjalon

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