# git rev-parse -q --verify 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a^{commit}
4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a
# git clean -qxdf
# < git log -1
# commit 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a
# Author: Michal Hocko <mhocko@suse.com>
# Date:   Fri Jan 25 19:08:58 2019 +0100
# 
#     Revert "mm, memory_hotplug: initialize struct pages for the full memory section"
#     
#     This reverts commit 2830bf6f05fb3e05bc4743274b806c821807a684.
#     
#     The underlying assumption that one sparse section belongs into a single
#     numa node doesn't hold really. Robert Shteynfeld has reported a boot
#     failure. The boot log was not captured but his memory layout is as
#     follows:
#     
#       Early memory node ranges
#         node   1: [mem 0x0000000000001000-0x0000000000090fff]
#         node   1: [mem 0x0000000000100000-0x00000000dbdf8fff]
#         node   1: [mem 0x0000000100000000-0x0000001423ffffff]
#         node   0: [mem 0x0000001424000000-0x0000002023ffffff]
#     
#     This means that node0 starts in the middle of a memory section which is
#     also in node1.  memmap_init_zone tries to initialize padding of a
#     section even when it is outside of the given pfn range because there are
#     code paths (e.g.  memory hotplug) which assume that the full worth of
#     memory section is always initialized.
#     
#     In this particular case, though, such a range is already intialized and
#     most likely already managed by the page allocator.  Scribbling over
#     those pages corrupts the internal state and likely blows up when any of
#     those pages gets used.
#     
#     Reported-by: Robert Shteynfeld <robert.shteynfeld@gmail.com>
#     Fixes: 2830bf6f05fb ("mm, memory_hotplug: initialize struct pages for the full memory section")
#     Cc: stable@kernel.org
#     Signed-off-by: Michal Hocko <mhocko@suse.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-ld --version
# < git log --format=%s --max-count=1 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a
# < make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  allmodconfig
# make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  
/kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery':
/kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (ret == -EOPNOTSUPP)
     ^
/kisskb/src/drivers/input/joystick/analog.c:172:2: warning: #warning Precise timer not defined for this architecture. [-Wcpp]
 #warning Precise timer not defined for this architecture.
  ^~~~~~~
WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: "clear_page" [fs/ocfs2/dlm/ocfs2_dlm.ko] has no CRC!
WARNING: "clear_page" [fs/ntfs/ntfs.ko] has no CRC!
WARNING: "copy_page" [fs/nilfs2/nilfs2.ko] has no CRC!
WARNING: "clear_page" [fs/gfs2/gfs2.ko] has no CRC!
WARNING: "copy_page" [fs/fuse/fuse.ko] has no CRC!
WARNING: "clear_page" [fs/fuse/fuse.ko] has no CRC!
WARNING: "clear_page" [fs/exofs/libore.ko] has no CRC!
WARNING: "clear_page" [fs/exofs/exofs.ko] has no CRC!
WARNING: "copy_page" [fs/cachefiles/cachefiles.ko] has no CRC!
WARNING: "copy_page" [fs/btrfs/btrfs.ko] has no CRC!
WARNING: "clear_page" [fs/btrfs/btrfs.ko] has no CRC!
WARNING: "clear_page" [drivers/scsi/sd_mod.ko] has no CRC!
WARNING: "clear_page" [drivers/md/raid456.ko] has no CRC!
WARNING: "clear_page" [drivers/md/dm-integrity.ko] has no CRC!
WARNING: "copy_page" [drivers/gpu/drm/ttm/ttm.ko] has no CRC!
WARNING: "clear_page" [drivers/gpu/drm/ttm/ttm.ko] has no CRC!
WARNING: "copy_page" [drivers/block/drbd/drbd.ko] has no CRC!
Completed OK
# rm -rf /kisskb/build/linus_nds32-allmodconfig_nds32le
# Build took: 0:09:49.741771