From: John Garry <john.garry@huawei.com>
To: <robin.murphy@arm.com>, <joro@8bytes.org>, <will@kernel.org>
Cc: <iommu@lists.linux.dev>, <linux-kernel@vger.kernel.org>,
<linuxarm@huawei.com>, John Garry <john.garry@huawei.com>
Subject: [PATCH v2 2/2] iova: Remove magazine BUG_ON() checks
Date: Mon, 5 Sep 2022 17:11:23 +0800 [thread overview]
Message-ID: <1662369083-238529-3-git-send-email-john.garry@huawei.com> (raw)
In-Reply-To: <1662369083-238529-1-git-send-email-john.garry@huawei.com>
Two of the magazine helpers have BUG_ON() checks, as follows:
- iova_magazine_pop() - here we ensure that the mag is not empty. However we
already ensure that in the only caller, __iova_rcache_get().
- iova_magazine_push() - here we ensure that the mag is not full. However
we already ensure that in the only caller, __iova_rcache_insert().
As described, the two bug checks are pointless so drop them.
Signed-off-by: John Garry <john.garry@huawei.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/iova.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index 580fdf669922..8aece052ce72 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -694,8 +694,6 @@ static unsigned long iova_magazine_pop(struct iova_magazine *mag,
int i;
unsigned long pfn;
- BUG_ON(iova_magazine_empty(mag));
-
/* Only fall back to the rbtree if we have no suitable pfns at all */
for (i = mag->size - 1; mag->pfns[i] > limit_pfn; i--)
if (i == 0)
@@ -710,8 +708,6 @@ static unsigned long iova_magazine_pop(struct iova_magazine *mag,
static void iova_magazine_push(struct iova_magazine *mag, unsigned long pfn)
{
- BUG_ON(iova_magazine_full(mag));
-
mag->pfns[mag->size++] = pfn;
}
--
2.35.3
next prev parent reply other threads:[~2022-09-05 9:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-05 9:11 [PATCH v2 0/2] iova: Some misc changes John Garry
2022-09-05 9:11 ` [PATCH v2 1/2] iova: Remove some magazine pointer NULL checks John Garry
2022-09-05 15:06 ` Jerry Snitselaar
2022-09-06 9:28 ` Ethan Zhao
2022-09-06 10:50 ` John Garry
2022-09-06 13:37 ` Robin Murphy
2022-09-06 17:36 ` John Garry
2022-09-06 18:25 ` Robin Murphy
2022-09-07 8:46 ` John Garry
2022-09-07 9:05 ` Robin Murphy
2022-09-07 9:58 ` Ethan Zhao
2022-09-07 10:10 ` John Garry
2022-09-07 9:33 ` Ethan Zhao
2022-09-07 9:53 ` John Garry
2022-09-05 9:11 ` John Garry [this message]
2022-09-05 15:06 ` [PATCH v2 2/2] iova: Remove magazine BUG_ON() checks Jerry Snitselaar
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