linux-kernel - [PATCH AUTOSEL for 4.9 025/219] eventpoll.h: fix epoll event masks

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Date:   Sat, 3 Mar 2018 22:28:10 +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:     Greg KH <gregkh@...uxfoundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 025/219] eventpoll.h: fix epoll event masks

From: Greg KH <gregkh@...uxfoundation.org>

[ Upstream commit 6f051e4a685b768f3704c7c069aa1edee3010622 ]

[resend due to me forgetting to cc: linux-api the first time around I
posted these back on Feb 23]

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

When userspace tries to use these defines, it complains that it needs to
be an unsigned 1 that is shifted, so libc implementations have to create
their own version.  Fix this by defining it properly so that libcs can
just use the kernel uapi header.

Reported-by: Elliott Hughes <enh@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 include/uapi/linux/eventpoll.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/eventpoll.h b/include/uapi/linux/eventpoll.h
index bc96b14dfb2c..f4d5c998cc2b 100644
--- a/include/uapi/linux/eventpoll.h
+++ b/include/uapi/linux/eventpoll.h
@@ -40,7 +40,7 @@
 #define EPOLLRDHUP	0x00002000
 
 /* Set exclusive wakeup mode for the target file descriptor */
-#define EPOLLEXCLUSIVE (1 << 28)
+#define EPOLLEXCLUSIVE (1U << 28)
 
 /*
  * Request the handling of system wakeup events so as to prevent system suspends
@@ -52,13 +52,13 @@
  *
  * Requires CAP_BLOCK_SUSPEND
  */
-#define EPOLLWAKEUP (1 << 29)
+#define EPOLLWAKEUP (1U << 29)
 
 /* Set the One Shot behaviour for the target file descriptor */
-#define EPOLLONESHOT (1 << 30)
+#define EPOLLONESHOT (1U << 30)
 
 /* Set the Edge Triggered behaviour for the target file descriptor */
-#define EPOLLET (1 << 31)
+#define EPOLLET (1U << 31)
 
 /* 
  * On x86-64 make the 64bit structure have the same alignment as the
-- 
2.14.1