Hi, On Thu, Jun 28, 2018 at 02:28:57PM +0800, Baoquan He wrote: > Pavel pointed out that the behaviour of allocating memmap together > for one node should be defaulted for all ARCH-es. It won't break > anything because it will drop to the fallback action to allocate > imemmap for each section at one time if failed on large chunk of > memory. > > So remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER and clean up the > related codes. > This patch causes several of my qemu boot tests to fail. powerpc:mac99:ppc64_book3s_defconfig:initrd:nosmp powerpc:mac99:ppc64_book3s_defconfig:initrd:smp4 powerpc:mac99:ppc64_book3s_defconfig:rootfs:smp4 powerpc:pseries:pseries_defconfig:initrd powerpc:pseries:pseries_defconfig:rootfs powerpc:powernv:powernv_defconfig:initrd Bisect points to this patch. Bisect log is attached for reference. Reverting the patch fixes the problem. [ Yes, I am aware that Michael already reported the problem at https://lkml.org/lkml/2018/7/11/480 ] Guenter --- # bad: [98be45067040799a801e6ce52d8bf4659a153893] Add linux-next specific files for 20180711 # good: [1e4b044d22517cae7047c99038abb444423243ca] Linux 4.18-rc4 git bisect start 'HEAD' 'v4.18-rc4' # good: [ade30e73739a5174bcaee5860fee76c2365548c5] Merge remote-tracking branch 'crypto/master' git bisect good ade30e73739a5174bcaee5860fee76c2365548c5 # good: [792be221c35d19a1c486789e5b5c91c05279b94d] Merge remote-tracking branch 'tip/auto-latest' git bisect good 792be221c35d19a1c486789e5b5c91c05279b94d # good: [1d66737ba99400ab9a79c906a25b2090f4cc8b18] Merge remote-tracking branch 'mux/for-next' git bisect good 1d66737ba99400ab9a79c906a25b2090f4cc8b18 # good: [c02d5416bd8504866dd80d2129f4648747166b6f] Merge remote-tracking branch 'kspp/for-next/kspp' git bisect good c02d5416bd8504866dd80d2129f4648747166b6f # bad: [1e741337a9416010a48c6034855e316ba8057111] ntb: ntb_hw_switchtec: cleanup 64bit IO defines to use the common header git bisect bad 1e741337a9416010a48c6034855e316ba8057111 # good: [205a106bac127145a4defae7d0d35945001fe924] kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN git bisect good 205a106bac127145a4defae7d0d35945001fe924 # bad: [e87ebebf76c9ceeaea21a256341d6765c657e550] mm, oom: remove sleep from under oom_lock git bisect bad e87ebebf76c9ceeaea21a256341d6765c657e550 # good: [9f95e9e87283a578fb676f14fd5e1edd4cb401f7] mm/vmscan.c: iterate only over charged shrinkers during memcg shrink_slab() git bisect good 9f95e9e87283a578fb676f14fd5e1edd4cb401f7 # bad: [0ba29a108979bdbe3f77094e8b5cc06652e2698b] mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER git bisect bad 0ba29a108979bdbe3f77094e8b5cc06652e2698b # good: [ca464c7768574c49f58a5be8962330814262820f] mm/sparse.c: add a static variable nr_present_sections git bisect good ca464c7768574c49f58a5be8962330814262820f # good: [4f02f8533cbad406e004b3bfe75f65e6b791efd5] mm/sparse.c: add a new parameter 'data_unit_size' for alloc_usemap_and_memmap git bisect good 4f02f8533cbad406e004b3bfe75f65e6b791efd5 # good: [110cb339e5d95c77cf83d33de25f6f392d0ca7f6] mm-sparse-optimize-memmap-allocation-during-sparse_init-checkpatch-fixes git bisect good 110cb339e5d95c77cf83d33de25f6f392d0ca7f6 # first bad commit: [0ba29a108979bdbe3f77094e8b5cc06652e2698b] mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
