# git rev-parse -q --verify 47b8def9358c5eb888e78b24b7e5b7f2e2e97b8e^{commit}
47b8def9358c5eb888e78b24b7e5b7f2e2e97b8e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 47b8def9358c5eb888e78b24b7e5b7f2e2e97b8e
# git clean -qxdf
# < git log -1
# commit 47b8def9358c5eb888e78b24b7e5b7f2e2e97b8e
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Tue Oct 24 20:06:04 2023 +0530
# 
#     powerpc/mm: Avoid calling arch_enter/leave_lazy_mmu() in set_ptes
#     
#     With commit 9fee28baa601 ("powerpc: implement the new page table range
#     API") we added set_ptes to powerpc architecture. The implementation
#     included calling arch_enter/leave_lazy_mmu() calls.
#     
#     The patch removes the usage of arch_enter/leave_lazy_mmu() because
#     set_pte is not supposed to be used when updating a pte entry. Powerpc
#     architecture uses this rule to skip the expensive tlb invalidate which
#     is not needed when you are setting up the pte for the first time. See
#     commit 56eecdb912b5 ("mm: Use ptep/pmdp_set_numa() for updating
#     _PAGE_NUMA bit") for more details
#     
#     The patch also makes sure we are not using the interface to update a
#     valid/present pte entry by adding VM_WARN_ON check all the ptes we
#     are setting up. Furthermore, we add a comment to set_pte_filter to
#     clarify it can only update folio-related flags and cannot filter
#     pfn specific details in pte filtering.
#     
#     Removal of arch_enter/leave_lazy_mmu() also will avoid nesting of
#     these functions that are not supported. For ex:
#     
#     remap_pte_range()
#       -> arch_enter_lazy_mmu()
#       -> set_ptes()
#           -> arch_enter_lazy_mmu()
#           -> arch_leave_lazy_mmu()
#       -> arch_leave_lazy_mmu()
#     
#     Fixes: 9fee28baa601 ("powerpc: implement the new page table range API")
#     Signed-off-by: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20231024143604.16749-1-aneesh.kumar@linux.ibm.com
# < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-gcc --version
# < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-ld --version
# < git log --format=%s --max-count=1 47b8def9358c5eb888e78b24b7e5b7f2e2e97b8e
# make -s -j 40 ARCH=microblaze O=/kisskb/build/powerpc-fixes_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  mmu_defconfig
# < make -s -j 40 ARCH=microblaze O=/kisskb/build/powerpc-fixes_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  help
# make -s -j 40 ARCH=microblaze O=/kisskb/build/powerpc-fixes_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  olddefconfig
# make -s -j 40 ARCH=microblaze O=/kisskb/build/powerpc-fixes_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  
Kernel: arch/microblaze/boot/linux.bin is ready  (#1)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_mmu_defconfig_microblaze-gcc5
# Build took: 0:00:36.846327