linux-kernel - [PATCH 1/3] sgi-gru: use time

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Message-Id: <1442830699-20562-2-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Mon, 21 Sep 2015 15:48:17 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Dimitri Sivanich <sivanich@....com>
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 1/3] sgi-gru: use time_before()

From: Manuel Schölling <manuel.schoelling@....de>

To be future-proof and for better readability the time comparisons are
modified to use time_before() instead of plain, error-prone math.

Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
Acked-by: Dimitri Sivanich <sivanich@....com>
Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---

reference at: https://patchwork.kernel.org/patch/4270701/

 drivers/misc/sgi-gru/grumain.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c
index ae16c8c..1525870 100644
--- a/drivers/misc/sgi-gru/grumain.c
+++ b/drivers/misc/sgi-gru/grumain.c
@@ -930,6 +930,7 @@ int gru_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct gru_thread_state *gts;
 	unsigned long paddr, vaddr;
+	unsigned long expires;
 
 	vaddr = (unsigned long)vmf->virtual_address;
 	gru_dbg(grudev, "vma %p, vaddr 0x%lx (0x%lx)\n",
@@ -954,7 +955,8 @@ again:
 			mutex_unlock(&gts->ts_ctxlock);
 			set_current_state(TASK_INTERRUPTIBLE);
 			schedule_timeout(GRU_ASSIGN_DELAY);  /* true hack ZZZ */
-			if (gts->ts_steal_jiffies + GRU_STEAL_DELAY < jiffies)
+			expires = gts->ts_steal_jiffies + GRU_STEAL_DELAY;
+			if (time_before(expires, jiffies))
 				gru_steal_context(gts);
 			goto again;
 		}
-- 
1.9.1

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