On Sat, Jun 05, 2021 at 02:10:46PM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: ccc252d2e818f6a479441119ad453c3ce7c7c461 > commit: a7ba988ff9de37f0961b4bf96d17aca73d0d2e25 [7012/7430] mm, slub: change run-time assertion in kmalloc_index() to compile-time > config: parisc-randconfig-r014-20210604 (attached as .config) > compiler: hppa-linux-gcc (GCC) 9.3.0 > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a7ba988ff9de37f0961b4bf96d17aca73d0d2e25 > git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > git fetch --no-tags linux-next master > git checkout a7ba988ff9de37f0961b4bf96d17aca73d0d2e25 > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All errors (new ones prefixed by >>): > In file included from <command-line>: > In function 'kmalloc_index', > inlined from 'kmalloc_node' at include/linux/slab.h:572:20, > inlined from 'bpf_map_kmalloc_node.isra.0.part.0' at include/linux/bpf.h:1319:9: > >> include/linux/compiler_types.h:328:38: error: call to '__compiletime_assert_183' declared with attribute error: unexpected size in kmalloc_index() > 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > | ^ > include/linux/compiler_types.h:309:4: note: in definition of macro '__compiletime_assert' > 309 | prefix ## suffix(); \ > | ^~~~~~ > include/linux/compiler_types.h:328:2: note: in expansion of macro '_compiletime_assert' > 328 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > | ^~~~~~~~~~~~~~~~~~~ > include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' > 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) > | ^~~~~~~~~~~~~~~~~~ > include/linux/slab.h:389:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' > 389 | BUILD_BUG_ON_MSG(1, "unexpected size in kmalloc_index()"); > | ^~~~~~~~~~~~~~~~ Reproduce with attached config, and read the code. It has no problem in clang (clang-10/clang-11). it is problem with gcc. I found two ways to solve the error (maybe there would be better solution) Any thoughts or opinions? First ways is to change condition of kmalloc_index macro. diff --git a/include/linux/slab.h b/include/linux/slab.h index 70e46db766ca..be2c900cba4b 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -397,7 +397,7 @@ static __always_inline unsigned int __kmalloc_index(size_t size, /* Will never be reached. Needed because the compiler may complain */ return -1; } -#define kmalloc_index(s) __kmalloc_index(s, true) +#define kmalloc_index(s) __kmalloc_index(s, __builtin_constant_p(s) && true) #endif /* !CONFIG_SLOB */ void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __malloc; Second way is making bpf_map_kmalloc_node always inline. diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 02b02cb29ce2..09379d705349 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1312,7 +1312,7 @@ void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags); void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align, gfp_t flags); #else -static inline void * +static __always_inline void * bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags, int node) {
