# git rev-parse -q --verify 5b82a04d57b60f48dc7f73763941a6542ad1cf16^{commit}
5b82a04d57b60f48dc7f73763941a6542ad1cf16
already have revision, skipping fetch
# git checkout -q -f -B kisskb 5b82a04d57b60f48dc7f73763941a6542ad1cf16
# git clean -qxdf
# < git log -1
# commit 5b82a04d57b60f48dc7f73763941a6542ad1cf16
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Thu Feb 6 13:50:29 2020 +0000
# 
#     powerpc/hugetlb: Fix 8M hugepages on 8xx
#     
#     Commit 55c8fc3f4930 ("powerpc/8xx: reintroduce 16K pages with HW
#     assistance") redefined pte_t as a struct of 4 pte_basic_t, because
#     in 16K pages mode there are four identical entries in the page table.
#     But hugepd entries for 8k pages require only one entrie of size
#     pte_basic_t. So there is no point in creating a cache for 4 entries
#     page tables.
#     
#     Also, with HW assistance the entries must be 4k aligned, the 8xx
#     drops the last 12 bits. Redefine HUGEPD_SHIFT_MASK to mask them out.
#     
#     Calculate PTE_T_ORDER using the size of pte_basic_t instead of pte_t.
#     
#     In 16k mode, define a specific set_huge_pte_at() function which writes
#     the pte in a single entry instead of using set_pte_at() which writes
#     4 identical entries. Define set_pte_filter() inline otherwise GCC
#     doesn't inline it anymore because it is now used twice, and that gives
#     a pretty suboptimal code because of pte_t being a struct of 4 entries.
#     This function is also used for 512k pages which only require one entry
#     as well allthough replicating it four times is harmless as 512k pages
#     entries are spread every 128 bytes in the table.
#     
#     Fixes: 22569b881d37 ("powerpc/8xx: Enable 8M hugepage support with HW assistance")
#     Cc: stable@vger.kernel.org # v5.0+
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/e744db1529271d11a3fdcdf641617846907b6ffd.1580997012.git.christophe.leroy@c-s.fr
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 5b82a04d57b60f48dc7f73763941a6542ad1cf16
# < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_RADIX_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64_defconfig
# Added to kconfig CONFIG_PPC_RADIX_MMU=n
# yes \n | make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_RADIX_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_RADIX_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld: warning: orphan section `.gnu.hash' from `linker stubs' being placed in section `.gnu.hash'.
arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'
make[1]: *** [/kisskb/src/Makefile:1077: vmlinux] Error 1
make: *** [Makefile:179: sub-make] Error 2
Command 'make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_RADIX_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-fixes_ppc64_defconfig+NO_RADIX_powerpc-gcc8
# Build took: 0:03:50.433497