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Date:   Tue, 19 May 2020 21:31:08 +0800
From:   kbuild test robot <>
To:     Roopa Prabhu <>,,
Subject: Re: [PATCH net-next 3/6] vxlan: ecmp support for mac fdb entries

Hi Roopa,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on net/master kselftest/next sparc-next/master linus/master v5.7-rc6 next-20200518]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see]

base: 5cdfe8306631b2224e3f81fc5a1e2721c7a1948b
config: um-defconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
        # save the attached .config to linux build tree
        make ARCH=um 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

cc1: warning: arch/um/include/uapi: No such file or directory [-Wmissing-include-dirs]
In file included from include/linux/kernel.h:11:0,
from net/ipv4/ip_tunnel_core.c:9:
include/asm-generic/fixmap.h: In function 'fix_to_virt':
include/asm-generic/fixmap.h:32:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
include/linux/compiler.h:330:9: note: in definition of macro '__compiletime_assert'
if (!(condition))                 ^~~~~~~~~
include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
include/asm-generic/fixmap.h:32:2: note: in expansion of macro 'BUILD_BUG_ON'
BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
In file included from include/linux/uaccess.h:11:0,
from include/linux/sched/task.h:11,
from include/linux/sched/signal.h:9,
from include/linux/rcuwait.h:6,
from include/linux/percpu-rwsem.h:7,
from include/linux/fs.h:34,
from include/linux/huge_mm.h:8,
from include/linux/mm.h:679,
from include/linux/bvec.h:13,
from include/linux/skbuff.h:17,
from net/ipv4/ip_tunnel_core.c:10:
arch/um/include/asm/uaccess.h: In function '__access_ok':
arch/um/include/asm/uaccess.h:17:29: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
(((unsigned long) (addr) >= FIXADDR_USER_START) &&                                 ^
arch/um/include/asm/uaccess.h:45:3: note: in expansion of macro '__access_ok_vsyscall'
__access_ok_vsyscall(addr, size) ||
In file included from net/ipv4/ip_tunnel_core.c:38:0:
include/net/vxlan.h: In function 'vxlan_fdb_nh_path_select':
include/net/vxlan.h:496:8: error: implicit declaration of function 'nexthop_path_fdb_result' [-Werror=implicit-function-declaration]
nhc = nexthop_path_fdb_result(nh, hash);
>> include/net/vxlan.h:496:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
nhc = nexthop_path_fdb_result(nh, hash);
cc1: some warnings being treated as errors

vim +496 include/net/vxlan.h

   490	static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh,
   491						    int hash,
   492						    struct vxlan_rdst *rdst)
   493	{
   494		struct fib_nh_common *nhc;
 > 496		nhc = nexthop_path_fdb_result(nh, hash);
   497		if (unlikely(!nhc))
   498			return false;
   500		switch (nhc->nhc_gw_family) {
   501		case AF_INET:
   502			rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4;
   503			rdst-> = AF_INET;
   504			break;
   505		case AF_INET6:
   506			rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6;
   507			rdst-> = AF_INET6;
   508			break;
   509		}
   511		return true;
   512	}

0-DAY CI Kernel Test Service, Intel Corporation

Download attachment ".config.gz" of type "application/gzip" (8489 bytes)

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