linux-kernel - [PATCH] xen-netback: fix type mismatch warning

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Message-Id: <20161012145434.2493788-1-arnd@arndb.de>
Date:   Wed, 12 Oct 2016 16:54:01 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Wei Liu <wei.liu2@...rix.com>,
        Paul Durrant <paul.durrant@...rix.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        David Vrabel <david.vrabel@...rix.com>,
        xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] xen-netback: fix type mismatch warning

Wiht the latest rework of the xen-netback driver, we get a warning
on ARM about the types passed into min():

drivers/net/xen-netback/rx.c: In function 'xenvif_rx_next_chunk':
include/linux/kernel.h:739:16: error: comparison of distinct pointer types lacks a cast [-Werror]

The reason is that XEN_PAGE_SIZE is not size_t here. There
is no actual bug, and we can easily avoid the warning using the
min_t() macro instead of min().

Fixes: eb1723a29b9a ("xen-netback: refactor guest rx")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/xen-netback/rx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/xen-netback/rx.c b/drivers/net/xen-netback/rx.c
index 8e9ade6ccf18..aeb150258c6c 100644
--- a/drivers/net/xen-netback/rx.c
+++ b/drivers/net/xen-netback/rx.c
@@ -337,9 +337,9 @@ static void xenvif_rx_next_chunk(struct xenvif_queue *queue,
 	frag_data += pkt->frag_offset;
 	frag_len -= pkt->frag_offset;
 
-	chunk_len = min(frag_len, XEN_PAGE_SIZE - offset);
-	chunk_len = min(chunk_len,
-			XEN_PAGE_SIZE -	xen_offset_in_page(frag_data));
+	chunk_len = min_t(size_t, frag_len, XEN_PAGE_SIZE - offset);
+	chunk_len = min_t(size_t, chunk_len, XEN_PAGE_SIZE -
+					     xen_offset_in_page(frag_data));
 
 	pkt->frag_offset += chunk_len;
 
-- 
2.9.0