linux-kernel - [PATCH 5.6 038/118] selftests: net: tcp_mmap: fix SO

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Message-Id: <20200513094420.731187269@linuxfoundation.org>
Date:   Wed, 13 May 2020 11:44:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Arjun Roy <arjunroy@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.6 038/118] selftests: net: tcp_mmap: fix SO_RCVLOWAT setting

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit a84724178bd7081cf3bd5b558616dd6a9a4ca63b ]

Since chunk_size is no longer an integer, we can not
use it directly as an argument of setsockopt().

This patch should fix tcp_mmap for Big Endian kernels.

Fixes: 597b01edafac ("selftests: net: avoid ptl lock contention in tcp_mmap")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Soheil Hassas Yeganeh <soheil@...gle.com>
Cc: Arjun Roy <arjunroy@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/testing/selftests/net/tcp_mmap.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/net/tcp_mmap.c
+++ b/tools/testing/selftests/net/tcp_mmap.c
@@ -282,12 +282,14 @@ static void setup_sockaddr(int domain, c
 static void do_accept(int fdlisten)
 {
 	pthread_attr_t attr;
+	int rcvlowat;
 
 	pthread_attr_init(&attr);
 	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 
+	rcvlowat = chunk_size;
 	if (setsockopt(fdlisten, SOL_SOCKET, SO_RCVLOWAT,
-		       &chunk_size, sizeof(chunk_size)) == -1) {
+		       &rcvlowat, sizeof(rcvlowat)) == -1) {
 		perror("setsockopt SO_RCVLOWAT");
 	}