# git rev-parse -q --verify 579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb^{commit}
579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb
already have revision, skipping fetch
# git checkout -q -f -B kisskb 579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb
# git clean -qxdf
# < git log -1
# commit 579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Wed Jan 23 11:51:38 2019 +0530
# 
#     powerpc/radix: Fix kernel crash with mremap()
#     
#     With support for split pmd lock, we use pmd page pmd_huge_pte pointer
#     to store the deposited page table. In those config when we move page
#     tables we need to make sure we move the deposited page table to the
#     correct pmd page. Otherwise this can result in crash when we withdraw
#     of deposited page table because we can find the pmd_huge_pte NULL.
#     
#     eg:
#     
#       __split_huge_pmd+0x1070/0x1940
#       __split_huge_pmd+0xe34/0x1940 (unreliable)
#       vma_adjust_trans_huge+0x110/0x1c0
#       __vma_adjust+0x2b4/0x9b0
#       __split_vma+0x1b8/0x280
#       __do_munmap+0x13c/0x550
#       sys_mremap+0x220/0x7e0
#       system_call+0x5c/0x70
#     
#     Fixes: 675d995297d4 ("powerpc/book3s64: Enable split pmd ptlock.")
#     Cc: stable@vger.kernel.org # v4.18+
#     Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_xes_mpc85xx_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  85xx/xes_mpc85xx_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_xes_mpc85xx_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/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/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:152:32: warning: 'levelspread[<Uc460>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:100:6: note: 'levelspread[<Uc460>]' 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/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/fs/udf/unicode.c: In function 'udf_name_conv_char':
/kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' 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/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/drivers/mtd/nand/raw/fsl_upm.c: In function 'fun_wait_rnb':
/kisskb/src/drivers/mtd/nand/raw/fsl_upm.c:69:20: warning: unused variable 'mtd' [-Wunused-variable]
INFO: Uncompressed kernel (size 0x7d6a28) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x800000)
Image Name:   Linux-5.0.0-rc1-g579b9239c1f3
Created:      Fri Feb  1 05:59:20 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    4060923 Bytes = 3965.75 KiB = 3.87 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_85xx_xes_mpc85xx_defconfig_powerpc-gcc4.6
# Build took: 0:00:53.321195