linux-kernel - [PATCH AUTOSEL for 4.14 52/97] staging: lustre: disable preempt while sampling processor id.

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Message-ID: <20180319155411.12348-52-alexander.levin@microsoft.com>
Date:   Mon, 19 Mar 2018 15:55:35 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     NeilBrown <neilb@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 52/97] staging: lustre: disable preempt while
 sampling processor id.

From: NeilBrown <neilb@...e.com>

[ Upstream commit dbeccabf5294e80f7cc9ee566746c42211bed736 ]

Calling smp_processor_id() without disabling preemption
triggers a warning (if CONFIG_DEBUG_PREEMPT).
I think the result of cfs_cpt_current() is only used as a hint for
load balancing, rather than as a precise and stable indicator of
the current CPU.  So it doesn't need to be called with
preemption disabled.

So disable preemption inside cfs_cpt_current() to silence the warning.

Signed-off-by: NeilBrown <neilb@...e.com>
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
index 2da051c0d251..a4bb93b440a5 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
@@ -528,19 +528,20 @@ EXPORT_SYMBOL(cfs_cpt_spread_node);
 int
 cfs_cpt_current(struct cfs_cpt_table *cptab, int remap)
 {
-	int cpu = smp_processor_id();
-	int cpt = cptab->ctb_cpu2cpt[cpu];
+	int cpu;
+	int cpt;
 
-	if (cpt < 0) {
-		if (!remap)
-			return cpt;
+	preempt_disable();
+	cpu = smp_processor_id();
+	cpt = cptab->ctb_cpu2cpt[cpu];
 
+	if (cpt < 0 && remap) {
 		/* don't return negative value for safety of upper layer,
 		 * instead we shadow the unknown cpu to a valid partition ID
 		 */
 		cpt = cpu % cptab->ctb_nparts;
 	}
-
+	preempt_enable();
 	return cpt;
 }
 EXPORT_SYMBOL(cfs_cpt_current);
-- 
2.14.1