Tested-by: Doron Tsur <dor...@mellanox.com>
Test log:
Compilation environments:
Ubuntu 13.10, x86_64, gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
Ubuntu 13.04, x86_64, gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
[ -ftrack-macro-expansion=2 issue submitted:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59495 ]
Kernel headers installed at:
make -C .../linux-stable headers_install \
INSTALL_HDR_PATH=/builds/kernel_tests_user_headers/
Pre-patch compilation:
gcc -Wall -Wextra -Werror
-I/builds/kernel_tests_pre_patch_user_headers/include
include-uapi-linux-netlink.h.test.c
In file included from include-uapi-linux-netlink.h.test.c:2:0:
include-uapi-linux-netlink.h.test.c: In function ‘main’:
/builds/kernel_tests_pre_patch_user_headers/include/linux/netlink.h:89:24:
error: comparison between signed and unsigned integer expressions
[-Werror=sign-compare]
(nlh)->nlmsg_len <= (len))
^
include-uapi-linux-netlink.h.test.c:26:5: note: in expansion of macro ‘NLMSG_OK’
NLMSG_OK(&auxiliary_netlink_header, active_len));
^
cc1: all warnings being treated as errors
$ ./a.out
nlmsg_len= 1, len = 1 NLMSG_OK(nlh,len) test result: 0
nlmsg_len= 1, len = 3000 NLMSG_OK(nlh,len) test result: 0
nlmsg_len= 3000, len = 1 NLMSG_OK(nlh,len) test result: 0
nlmsg_len= 3000, len = 3000 NLMSG_OK(nlh,len) test result: 1
Signed-off-by: Doron Tsur <dor...@mellanox.com>
---
include/uapi/linux/netlink.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
index 1a85940..1884d4e 100644
--- a/include/uapi/linux/netlink.h
+++ b/include/uapi/linux/netlink.h
@@ -86,7 +86,7 @@ struct nlmsghdr {
(struct nlmsghdr*)(((char*)(nlh)) +
NLMSG_ALIGN((nlh)->nlmsg_len)))
#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
- (nlh)->nlmsg_len <= (len))
+ (int)(nlh)->nlmsg_len <= (len))
#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
#define NLMSG_NOOP 0x1 /* Nothing. */
--
1.7.1
--
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