# git rev-parse -q --verify ac790d09885d36143076e7e02825c541e8eee899^{commit}
ac790d09885d36143076e7e02825c541e8eee899
already have revision, skipping fetch
# git checkout -q -f -B kisskb ac790d09885d36143076e7e02825c541e8eee899
# git clean -qxdf
# < git log -1
# commit ac790d09885d36143076e7e02825c541e8eee899
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Wed Jun 29 10:39:25 2022 +0530
# 
#     powerpc/memhotplug: Add add_pages override for PPC
#     
#     With commit ffa0b64e3be5 ("powerpc: Fix virt_addr_valid() for 64-bit Book3E & 32-bit")
#     the kernel now validate the addr against high_memory value. This results
#     in the below BUG_ON with dax pfns.
#     
#     [  635.798741][T26531] kernel BUG at mm/page_alloc.c:5521!
#     1:mon> e
#     cpu 0x1: Vector: 700 (Program Check) at [c000000007287630]
#         pc: c00000000055ed48: free_pages.part.0+0x48/0x110
#         lr: c00000000053ca70: tlb_finish_mmu+0x80/0xd0
#         sp: c0000000072878d0
#        msr: 800000000282b033
#       current = 0xc00000000afabe00
#       paca    = 0xc00000037ffff300   irqmask: 0x03   irq_happened: 0x05
#         pid   = 26531, comm = 50-landscape-sy
#     kernel BUG at :5521!
#     Linux version 5.19.0-rc3-14659-g4ec05be7c2e1 (kvaneesh@ltc-boston8) (gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #625 SMP Thu Jun 23 00:35:43 CDT 2022
#     1:mon> t
#     [link register   ] c00000000053ca70 tlb_finish_mmu+0x80/0xd0
#     [c0000000072878d0] c00000000053ca54 tlb_finish_mmu+0x64/0xd0 (unreliable)
#     [c000000007287900] c000000000539424 exit_mmap+0xe4/0x2a0
#     [c0000000072879e0] c00000000019fc1c mmput+0xcc/0x210
#     [c000000007287a20] c000000000629230 begin_new_exec+0x5e0/0xf40
#     [c000000007287ae0] c00000000070b3cc load_elf_binary+0x3ac/0x1e00
#     [c000000007287c10] c000000000627af0 bprm_execve+0x3b0/0xaf0
#     [c000000007287cd0] c000000000628414 do_execveat_common.isra.0+0x1e4/0x310
#     [c000000007287d80] c00000000062858c sys_execve+0x4c/0x60
#     [c000000007287db0] c00000000002c1b0 system_call_exception+0x160/0x2c0
#     [c000000007287e10] c00000000000c53c system_call_common+0xec/0x250
#     
#     The fix is to make sure we update high_memory on memory hotplug.
#     This is similar to what x86 does in commit 3072e413e305 ("mm/memory_hotplug: introduce add_pages")
#     
#     Fixes: ffa0b64e3be5 ("powerpc: Fix virt_addr_valid() for 64-bit Book3E & 32-bit")
#     Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20220629050925.31447-1-aneesh.kumar@linux.ibm.com
# < /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 ac790d09885d36143076e7e02825c541e8eee899
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_makalu_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/makalu_defconfig
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_makalu_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_makalu_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_makalu_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_40x_makalu_defconfig_powerpc-gcc5
# Build took: 0:00:22.135213