Re: [PATCHv2 10/14] bpf: Use set_memory.h header

kbuild test robot
2017-03-05T03:01:11Z

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Hi Laura,

[auto build test ERROR on linus/master]
[also build test ERROR on next-20170303]
[cannot apply to tip/x86/core drm/drm-next v4.10]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Laura-Abbott/set_memory_-functions-header-refactor/20170305-062939
config: arm-allmodconfig (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 errors (new ones prefixed by >>):

arch/arm/net/bpf_jit_32.c: In function 'bpf_jit_compile':
>> arch/arm/net/bpf_jit_32.c:1051:2: error: implicit declaration of function 'flush_icache_range' [-Werror=implicit-function-declaration]
flush_icache_range((u32)header, (u32)(ctx.target + ctx.idx));
^~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/flush_icache_range +1051 arch/arm/net/bpf_jit_32.c

ddecdfce Mircea Gherzan 2012-03-16 1035 goto out;
ddecdfce Mircea Gherzan 2012-03-16 1036
55309dd3 Daniel Borkmann 2014-09-08 1037 ctx.target = (u32 *) target_ptr;
ddecdfce Mircea Gherzan 2012-03-16 1038 ctx.idx = 0;
55309dd3 Daniel Borkmann 2014-09-08 1039
ddecdfce Mircea Gherzan 2012-03-16 1040 build_prologue(&ctx);
0b59d880 Nicolas Schichan 2015-05-07 1041 if (build_body(&ctx) < 0) {
0b59d880 Nicolas Schichan 2015-05-07 1042 #if __LINUX_ARM_ARCH__ < 7
0b59d880 Nicolas Schichan 2015-05-07 1043 if (ctx.imm_count)
0b59d880 Nicolas Schichan 2015-05-07 1044 kfree(ctx.imms);
0b59d880 Nicolas Schichan 2015-05-07 1045 #endif
0b59d880 Nicolas Schichan 2015-05-07 1046 bpf_jit_binary_free(header);
0b59d880 Nicolas Schichan 2015-05-07 1047 goto out;
0b59d880 Nicolas Schichan 2015-05-07 1048 }
ddecdfce Mircea Gherzan 2012-03-16 1049 build_epilogue(&ctx);
ddecdfce Mircea Gherzan 2012-03-16 1050
ebaef649 Daniel Borkmann 2015-11-14 @1051 flush_icache_range((u32)header, (u32)(ctx.target + ctx.idx));
ddecdfce Mircea Gherzan 2012-03-16 1052
ddecdfce Mircea Gherzan 2012-03-16 1053 #if __LINUX_ARM_ARCH__ < 7
ddecdfce Mircea Gherzan 2012-03-16 1054 if (ctx.imm_count)
ddecdfce Mircea Gherzan 2012-03-16 1055 kfree(ctx.imms);
ddecdfce Mircea Gherzan 2012-03-16 1056 #endif
ddecdfce Mircea Gherzan 2012-03-16 1057
ddecdfce Mircea Gherzan 2012-03-16 1058 if (bpf_jit_enable > 1)
79617801 Daniel Borkmann 2013-03-21 1059 /* there are 2 passes here */

:::::: The code at line 1051 was first introduced by commit
:::::: ebaef649c26b44ff28114b452fd067a270ca7f02 bpf, arm: start flushing icache range from header

:::::: TO: Daniel Borkmann <daniel@iogearbox.net>
:::::: CC: David S. Miller <davem@davemloft.net>

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