Hi Yuchung,
[auto build test ERROR on net-next/master]
url: https://github.com/0day-ci/linux/commits/Neal-Cardwell/tcp-BBR-congestion-control-algorithm/20160917-025323
config: arm-nhk8815_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm
All error/warnings (new ones prefixed by >>):
In file included from arch/arm/include/asm/div64.h:126:0,
from include/linux/kernel.h:142,
from include/linux/crypto.h:21,
from include/crypto/hash.h:16,
from net/ipv4/tcp.c:250:
net/ipv4/tcp.c: In function 'tcp_get_info':
include/asm-generic/div64.h:207:28: warning: comparison of distinct pointer types lacks a cast
(void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
^quoted
net/ipv4/tcp.c:2794:3: note: in expansion of macro 'do_div'
do_div(rate, intv);
^~~~~~
In file included from arch/arm/include/asm/atomic.h:14:0,
from include/linux/atomic.h:4,
from include/linux/crypto.h:20,
from include/crypto/hash.h:16,
from net/ipv4/tcp.c:250:
include/asm-generic/div64.h:220:25: warning: right shift count >= width of type [-Wshift-count-overflow]
} else if (likely(((n) >> 32) == 0)) { \
^
include/linux/compiler.h:167:40: note: in definition of macro 'likely'
# define likely(x) __builtin_expect(!!(x), 1)
^quoted
net/ipv4/tcp.c:2794:3: note: in expansion of macro 'do_div'
do_div(rate, intv);
^~~~~~
In file included from arch/arm/include/asm/div64.h:126:0,
from include/linux/kernel.h:142,
from include/linux/crypto.h:21,
from include/crypto/hash.h:16,
from net/ipv4/tcp.c:250:quoted
include/asm-generic/div64.h:224:22: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
__rem = __div64_32(&(n), __base); \
^quoted
net/ipv4/tcp.c:2794:3: note: in expansion of macro 'do_div'
do_div(rate, intv);
^~~~~~
In file included from include/linux/kernel.h:142:0,
from include/linux/crypto.h:21,
from include/crypto/hash.h:16,
from net/ipv4/tcp.c:250:
arch/arm/include/asm/div64.h:32:24: note: expected 'uint64_t * {aka long long unsigned int *}' but argument is of type 'u32 * {aka unsigned int *}'
static inline uint32_t __div64_32(uint64_t *n, uint32_t base)
^~~~~~~~~~
cc1: some warnings being treated as errors
vim +/do_div +2794 net/ipv4/tcp.c
2778 } while (u64_stats_fetch_retry_irq(&tp->syncp, start));
2779 info->tcpi_segs_out = tp->segs_out;
2780 info->tcpi_segs_in = tp->segs_in;
2781
2782 notsent_bytes = READ_ONCE(tp->write_seq) - READ_ONCE(tp->snd_nxt);
2783 info->tcpi_notsent_bytes = max(0, notsent_bytes);
2784
2785 info->tcpi_min_rtt = tcp_min_rtt(tp);
2786 info->tcpi_data_segs_in = tp->data_segs_in;
2787 info->tcpi_data_segs_out = tp->data_segs_out;
2788
2789 info->tcpi_delivery_rate_app_limited = tp->rate_app_limited ? 1 : 0;
2790 rate = READ_ONCE(tp->rate_delivered);
2791 intv = READ_ONCE(tp->rate_interval_us);
2792 if (rate && intv) {
2793 rate = rate * tp->mss_cache * USEC_PER_SEC;2794 do_div(rate, intv);
2795 put_unaligned(rate, &info->tcpi_delivery_rate);
2796 }
2797 }
2798 EXPORT_SYMBOL_GPL(tcp_get_info);
2799
2800 static int do_tcp_getsockopt(struct sock *sk, int level,
2801 int optname, char __user *optval, int __user *optlen)
2802 {
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