On Wed, 22 Aug 2018 19:37:44 +0800 kbuild test robot <lkp@xxxxxxxxx> wrote: > tree: git://git.cmpxchg.org/linux-mmotm.git master > head: 10b78d76f1897885d7753586ecd113e9d6728c5d > commit: be2e6e87ac5e7f8f30c442bb1a042266e1ab6fcd [187/242] mm/memblock: introduce pfn_valid_region() > config: arm-omap2plus_defconfig (attached as .config) > compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > git checkout be2e6e87ac5e7f8f30c442bb1a042266e1ab6fcd > # save the attached .config to linux build tree > GCC_VERSION=7.2.0 make.cross ARCH=arm > > All error/warnings (new ones prefixed by >>): > > mm/memblock.c: In function 'pfn_valid_region': > >> mm/memblock.c:1290:6: error: 'early_region_idx' undeclared (first use in this function); did you mean 'early_pfn_to_nid'? > if (early_region_idx != -1) { > ^~~~~~~~~~~~~~~~ > early_pfn_to_nid > mm/memblock.c:1290:6: note: each undeclared identifier is reported only once for each function it appears in > >> mm/memblock.c:1305:1: warning: control reaches end of non-void function [-Wreturn-type] > } oops --- a/mm/memblock.c~mm-page_alloc-reduce-unnecessary-binary-search-in-memblock_next_valid_pfn-fix-fix +++ a/mm/memblock.c @@ -1232,6 +1232,7 @@ int __init_memblock memblock_set_node(ph #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ #ifdef CONFIG_HAVE_MEMBLOCK_PFN_VALID +static int early_region_idx __initdata_memblock = -1; unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn) { struct memblock_type *type = &memblock.memory; @@ -1240,7 +1241,6 @@ unsigned long __init_memblock memblock_n uint mid, left = 0; unsigned long start_pfn, end_pfn, next_start_pfn; phys_addr_t addr = PFN_PHYS(++pfn); - static int early_region_idx __initdata_memblock = -1; /* fast path, return pfn+1 if next pfn is in the same region */ if (early_region_idx != -1) { _
