Building the kernel on s390 with -Og produces the following warning: WARNING: vmlinux.o(.text+0x28dabe): Section mismatch in reference from the function populate_section_memmap() to the function .meminit.text:__populate_section_memmap() The function populate_section_memmap() references the function __meminit __populate_section_memmap(). This is often because populate_section_memmap lacks a __meminit annotation or the annotation of __populate_section_memmap is wrong. While -Og is not supported, in theory this might still happen with another compiler or on another architecture. So fix this by using the correct section annotations. Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx> --- v1 -> v2: Do not touch mm/sparse.c version of __populate_section_memmap: its __init annotation is correct, since it is only called during init phase (by sparse_init_nid), and contains the call to another __init function. Spotted by kbuild test robot <lkp@xxxxxxxxx> and Oscar Salvador <osalvador@xxxxxxx>. I was notified that v1 has already been included into http://ozlabs.org/~akpm/mmots/broken-out. Since this is not a git repository, I've decided to send a v2 instead of the fix. Please let me know if I should send a fix instead. mm/sparse.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/sparse.c b/mm/sparse.c index f6891c1992b1..c2c01b6330af 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -647,7 +647,7 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) #endif #ifdef CONFIG_SPARSEMEM_VMEMMAP -static struct page *populate_section_memmap(unsigned long pfn, +static struct page * __meminit populate_section_memmap(unsigned long pfn, unsigned long nr_pages, int nid, struct vmem_altmap *altmap) { return __populate_section_memmap(pfn, nr_pages, nid, altmap); @@ -669,7 +669,7 @@ static void free_map_bootmem(struct page *memmap) vmemmap_free(start, end, NULL); } #else -struct page *populate_section_memmap(unsigned long pfn, +struct page * __meminit populate_section_memmap(unsigned long pfn, unsigned long nr_pages, int nid, struct vmem_altmap *altmap) { struct page *page, *ret; -- 2.23.0
