linux-kernel - [PATCH BUGFIX 3/3] null_blk: change type of completion

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Date:	Mon,  2 Nov 2015 15:31:13 +0100
From:	Paolo Valente <paolo.valente@...more.it>
To:	Jens Axboe <axboe@...com>,
	Matias Bjørling <m@...rling.me>,
	Arianna Avanzini <avanzini@...gle.com>
Cc:	Paolo Valente <paolo.valente@...more.it>,
	Akinobu Mita <akinobu.mita@...il.com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Ming Lei <ming.lei@...onical.com>,
	Mike Krinkin <krinkin.m.u@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH BUGFIX 3/3] null_blk: change type of completion_nsec to unsigned long

From: Arianna Avanzini <avanzini@...gle.com>

This commit at least doubles the maximum value for
completion_nsec. This helps in special cases where one wants/needs to
emulate an extremely slow I/O (for example to spot bugs).

Signed-off-by: Paolo Valente <paolo.valente@...more.it>
Signed-off-by: Arianna Avanzini <avanzini@...gle.com>
---
 drivers/block/null_blk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index caaff67..6f0bb2f 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -125,8 +125,8 @@ static const struct kernel_param_ops null_irqmode_param_ops = {
 device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO);
 MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer");
 
-static int completion_nsec = 10000;
-module_param(completion_nsec, int, S_IRUGO);
+static unsigned long completion_nsec = 10000;
+module_param(completion_nsec, ulong, S_IRUGO);
 MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns");
 
 static int hw_queue_depth = 64;
-- 
1.9.1

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