# 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/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_le_defconfig
# Added to kconfig CONFIG_PPC_SPLPAR=n
# yes \n | make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
WARNING: modpost: Found 3 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_ppc64le-gcc5
# Build took: 0:02:24.454157