# 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/sh4-linux/bin/sh4-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-ld --version
# < git log --format=%s --max-count=1 4aa9fc2a435abe95a1e8d7f8c7b3d6356514b37a
# < make -s -j 48 ARCH=sh O=/kisskb/build/linus_rts7751r2dplus_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  rts7751r2dplus_defconfig
# make -s -j 48 ARCH=sh O=/kisskb/build/linus_rts7751r2dplus_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  
  Generating include/generated/machtypes.h
<stdin>:1318:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp]
<stdin>:1321:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp]
<stdin>:1324:2: warning: #warning syscall pkey_free not implemented [-Wcpp]
<stdin>:1327:2: warning: #warning syscall statx not implemented [-Wcpp]
<stdin>:1333:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
<stdin>:1336:2: warning: #warning syscall rseq not implemented [-Wcpp]
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S: Assembler messages:
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:385: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:388: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/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/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/net/ipv4/ip_output.c: In function '__ip_append_data':
/kisskb/src/include/linux/skbuff.h:1338:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/ipv4/ip_output.c:885:14: note: 'extra_uref' was declared here
/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/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/sh/clk/cpg.c: In function 'r8':
/kisskb/src/drivers/sh/clk/cpg.c:41:2: warning: passing argument 1 of 'ioread8' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:29:21: note: expected 'void *' but argument is of type 'const void *'
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r16':
/kisskb/src/drivers/sh/clk/cpg.c:46:2: warning: passing argument 1 of 'ioread16' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:30:21: note: expected 'void *' but argument is of type 'const void *'
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r32':
/kisskb/src/drivers/sh/clk/cpg.c:51:2: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:32:21: note: expected 'void *' but argument is of type 'const void *'
  Kernel: arch/sh/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/linus_rts7751r2dplus_defconfig_sh4
# Build took: 0:00:30.987727