# 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/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-ld --version
# < git log --format=%s --max-count=1 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a
# < make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  defconfig
# make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  
/kisskb/src/arch/mips/vdso/Makefile:38: MIPS VDSO requires binutils >= 2.25
/kisskb/src/arch/mips/boot/dts/xilfpga/nexys4ddr.dts:109.16-112.8: Warning (i2c_bus_reg): /i2c@10A00000/ad7420@4B: I2C bus unit address format error, expected "4b"
/kisskb/src/arch/mips/vdso/Makefile:38: MIPS VDSO requires binutils >= 2.25
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:152:32: warning: 'levelspread[<U6780>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:100:6: note: 'levelspread[<U6780>]' was declared here
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1263:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/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 [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:227:19: note: 'i' was declared here
/kisskb/src/arch/mips/vdso/Makefile:38: MIPS VDSO requires binutils >= 2.25
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
FIT description: Linux 5.0.0-rc4-g4aa9fc2a435a
Created:         Tue Jan 29 07:58:31 2019
 Image 0 (kernel@0)
  Description:  Linux 5.0.0-rc4-g4aa9fc2a435a
  Created:      Tue Jan 29 07:58:31 2019
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4329397 Bytes = 4227.93 KiB = 4.13 MiB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x8080c210
  Hash algo:    sha1
  Hash value:   5242fe2dcad57fd49c8e100b28bc2f9e150afd84
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Tue Jan 29 07:58:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    3793 Bytes = 3.70 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   4799f50d688573234da6e9d7701234d394759ef4
 Image 2 (fdt@ni169445)
  Description:  NI 169445 device tree
  Created:      Tue Jan 29 07:58:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    1871 Bytes = 1.83 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   51b89b31605ee62038c8468c429af091dfc75ec7
 Image 3 (fdt@xilfpga)
  Description:  MIPSfpga (xilfpga) Device Tree
  Created:      Tue Jan 29 07:58:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    2708 Bytes = 2.64 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   509ce58e44c561d54539e64e9d4b47054e696fc6
 Default Configuration: 'conf@default'
 Configuration 0 (conf@default)
  Description:  Generic Linux kernel
  Kernel:       kernel@0
 Configuration 1 (conf@boston)
  Description:  Boston Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@boston
 Configuration 2 (conf@ni169445)
  Description:  NI 169445 Linux Kernel
  Kernel:       kernel@0
  FDT:          fdt@ni169445
 Configuration 3 (conf@xilfpga)
  Description:  MIPSfpga Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@xilfpga
Completed OK
# rm -rf /kisskb/build/linus_mips-defconfig_mips
# Build took: 0:01:29.529402