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From: Nicholas Mc Guire <hofrat@osadl.org>
To: Jon Mason <jdmason@kudzu.us>
Cc: Dave Jiang <dave.jiang@intel.com>,
	Allen Hubbe <Allen.Hubbe@emc.com>,
	Logan Gunthorpe <logang@deltatee.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
	linux-ntb@googlegroups.com, linux-kernel@vger.kernel.org,
	Nicholas Mc Guire <hofrat@osadl.org>
Subject: [PATCH 2/2] ntb: make DMA_OUT_RESOURCE_TO HZ independent
Date: Mon, 22 Aug 2016 18:51:36 +0200	[thread overview]
Message-ID: <1471884696-25558-2-git-send-email-hofrat@osadl.org> (raw)
In-Reply-To: <1471884696-25558-1-git-send-email-hofrat@osadl.org>

schedule_timeout_* takes a timeout in jiffies but the code currently is
passing in a constant which makes this timeout HZ dependent, so pass it
through msecs_to_jiffies() to fix this up.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
---

Problem found by coccinelle script

The below patch sets the timeout to 50ms - not clear what HZ setting was
assumed during design/testing, so this needs an ack by someone who knows
the driver and can confirm that 50ms is reasonable to wait on DMA retries.

Patch was compile tested with: x86_64_defconfig + CONFIG_NTB=m,
CONFIG_NTB_PERF=m

Patch is against 4.8.0-rc2 (localversion-next is -next-20160822)

 drivers/ntb/test/ntb_perf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 6a50f20..e065b69 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -72,7 +72,7 @@
 #define MAX_THREADS		32
 #define MAX_TEST_SIZE		SZ_1M
 #define MAX_SRCS		32
-#define DMA_OUT_RESOURCE_TO	50
+#define DMA_OUT_RESOURCE_TO	msecs_to_jiffies(50)
 #define DMA_RETRIES		20
 #define SZ_4G			(1ULL << 32)
 #define MAX_SEG_ORDER		20 /* no larger than 1M for kmalloc buffer */
-- 
2.1.4

  reply	other threads:[~2016-08-22 16:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-22 16:51 [PATCH 1/2] ntb_transport: " Nicholas Mc Guire
2016-08-22 16:51 ` Nicholas Mc Guire [this message]
2016-08-22 16:58   ` [PATCH 2/2] ntb: " Jiang, Dave
2016-08-23 16:43     ` Jon Mason

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