On 11/23/19 3:44 AM, kbuild test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: b9d3d01405061bb42358fe53f824e894a1922ced > commit: fc9702273e2edb90400a34b3be76f7b08fa3344b [11808/13503] bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY > config: arm-randconfig-a001-20191123 (attached as .config) > compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0 > reproduce: > wget https://urldefense.proofpoint.com/v2/url?u=https-3A__raw.githubusercontent.com_intel_lkp-2Dtests_master_sbin_make.cross&d=DwIBAg&c=5VD0RTtNlTh3ycd41b3MUw&r=vxqvl81C2rT6GOGdPyz8iQ&m=OyqPkKr2ayhE9rsjQ3V9TjPHNWGAzMj67odoKch8_YM&s=JuUtGb4L_bH6ANKEMAgVL3zSBnFkOW4jhVP9W3WBHBM&e= -O ~/bin/make.cross > chmod +x ~/bin/make.cross > git checkout fc9702273e2edb90400a34b3be76f7b08fa3344b > # save the attached .config to linux build tree > GCC_VERSION=7.4.0 make.cross ARCH=arm > > If you fix the issue, kindly add following tag > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > > All errors (new ones prefixed by >>): > > arm-linux-gnueabi-ld: section .data VMA [0000000000808000,00000000008829bf] overlaps section .ARM.unwind_idx VMA [00000000007d7000,000000000080b8ef] > arm-linux-gnueabi-ld: section .ARM.unwind_tab VMA [000000000080b8f0,000000000080febb] overlaps section .data VMA [0000000000808000,00000000008829bf] > kernel/bpf/syscall.o: In function `__bpf_map_area_alloc': >>> kernel/bpf/syscall.c:154: undefined reference to `vmalloc_user_node_flags' > Can't repro this with given config on x86_64. Trying to make make.cross work for me still. Any ideas why this is happening? I see that __vmalloc_node_flags_caller that we also use if #ifdef'ed as static inline in include/linux/vmalloc.h if no CONFIG_MMU is defined. Are we missing some config dependency or should I do the same trick as __vmalloc_node_flags_caller does? Also. Daniel, when I tried to build latest bpf-next with this config, I got another compilation error, related to your recent patch, you might want to take a look as well: CC kernel/tracepoint.o CC kernel/elfcore.o /data/users/andriin/linux/kernel/bpf/verifier.c: In function ‘fixup_bpf_calls’: /data/users/andriin/linux/kernel/bpf/verifier.c:9132:25: error: implicit declaration of function ‘bpf_jit_blinding_enabled’; did you mean ‘bpf_jit_kallsyms_enabled’? [-Werror=implicit-function-declaration] bool expect_blinding = bpf_jit_blinding_enabled(prog); ^~~~~~~~~~~~~~~~~~~~~~~~ bpf_jit_kallsyms_enabled CC kernel/irq_work.o CC kernel/crash_dump.o > vim +154 kernel/bpf/syscall.c > > 129 > 130 static void *__bpf_map_area_alloc(size_t size, int numa_node, bool mmapable) > 131 { > 132 /* We really just want to fail instead of triggering OOM killer > 133 * under memory pressure, therefore we set __GFP_NORETRY to kmalloc, > 134 * which is used for lower order allocation requests. > 135 * > 136 * It has been observed that higher order allocation requests done by > 137 * vmalloc with __GFP_NORETRY being set might fail due to not trying > 138 * to reclaim memory from the page cache, thus we set > 139 * __GFP_RETRY_MAYFAIL to avoid such situations. > 140 */ > 141 > 142 const gfp_t flags = __GFP_NOWARN | __GFP_ZERO; > 143 void *area; > 144 > 145 /* kmalloc()'ed memory can't be mmap()'ed */ > 146 if (!mmapable && size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { > 147 area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags, > 148 numa_node); > 149 if (area != NULL) > 150 return area; > 151 } > 152 if (mmapable) { > 153 BUG_ON(!PAGE_ALIGNED(size)); > > 154 return vmalloc_user_node_flags(size, numa_node, GFP_KERNEL | > 155 __GFP_RETRY_MAYFAIL | flags); > 156 } > 157 return __vmalloc_node_flags_caller(size, numa_node, > 158 GFP_KERNEL | __GFP_RETRY_MAYFAIL | > 159 flags, __builtin_return_address(0)); > 160 } > 161 > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.01.org_hyperkitty_list_kbuild-2Dall-40lists.01.org&d=DwIBAg&c=5VD0RTtNlTh3ycd41b3MUw&r=vxqvl81C2rT6GOGdPyz8iQ&m=OyqPkKr2ayhE9rsjQ3V9TjPHNWGAzMj67odoKch8_YM&s=zQax2z98Tn-V1wcH0rtwmJ0iA9DpFhqbVNzexx7wOWw&e= Intel Corporation >
