# git rev-parse -q --verify b55129f97aeefd265314e12d98935330e011a14a^{commit}
b55129f97aeefd265314e12d98935330e011a14a
already have revision, skipping fetch
# git checkout -q -f -B kisskb b55129f97aeefd265314e12d98935330e011a14a
# git clean -qxdf
# < git log -1
# commit b55129f97aeefd265314e12d98935330e011a14a
# Author: Christophe Leroy <christophe.leroy@csgroup.eu>
# Date:   Mon Jun 15 12:57:59 2020 +0000
# 
#     powerpc/8xx: Provide ptep_get() with 16k pages
#     
#     READ_ONCE() now enforces atomic read, which leads to:
#     
#       CC      mm/gup.o
#     In file included from ./include/linux/kernel.h:11:0,
#                      from mm/gup.c:2:
#     In function 'gup_hugepte.constprop',
#         inlined from 'gup_huge_pd.isra.79' at mm/gup.c:2465:8:
#     ./include/linux/compiler.h:392:38: error: call to '__compiletime_assert_222' declared with attribute error: Unsupported access size for {READ,WRITE}_ONCE().
#       _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
#                                           ^
#     ./include/linux/compiler.h:373:4: note: in definition of macro '__compiletime_assert'
#         prefix ## suffix();    \
#         ^
#     ./include/linux/compiler.h:392:2: note: in expansion of macro '_compiletime_assert'
#       _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
#       ^
#     ./include/linux/compiler.h:405:2: note: in expansion of macro 'compiletime_assert'
#       compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
#       ^
#     ./include/linux/compiler.h:291:2: note: in expansion of macro 'compiletime_assert_rwonce_type'
#       compiletime_assert_rwonce_type(x);    \
#       ^
#     mm/gup.c:2428:8: note: in expansion of macro 'READ_ONCE'
#       pte = READ_ONCE(*ptep);
#             ^
#     In function 'gup_get_pte',
#         inlined from 'gup_pte_range' at mm/gup.c:2228:9,
#         inlined from 'gup_pmd_range' at mm/gup.c:2613:15,
#         inlined from 'gup_pud_range' at mm/gup.c:2641:15,
#         inlined from 'gup_p4d_range' at mm/gup.c:2666:15,
#         inlined from 'gup_pgd_range' at mm/gup.c:2694:15,
#         inlined from 'internal_get_user_pages_fast' at mm/gup.c:2795:3:
#     ./include/linux/compiler.h:392:38: error: call to '__compiletime_assert_219' declared with attribute error: Unsupported access size for {READ,WRITE}_ONCE().
#       _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
#                                           ^
#     ./include/linux/compiler.h:373:4: note: in definition of macro '__compiletime_assert'
#         prefix ## suffix();    \
#         ^
#     ./include/linux/compiler.h:392:2: note: in expansion of macro '_compiletime_assert'
#       _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
#       ^
#     ./include/linux/compiler.h:405:2: note: in expansion of macro 'compiletime_assert'
#       compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
#       ^
#     ./include/linux/compiler.h:291:2: note: in expansion of macro 'compiletime_assert_rwonce_type'
#       compiletime_assert_rwonce_type(x);    \
#       ^
#     mm/gup.c:2199:9: note: in expansion of macro 'READ_ONCE'
#       return READ_ONCE(*ptep);
#              ^
#     make[2]: *** [mm/gup.o] Error 1
#     
#     Define ptep_get() on 8xx when using 16k pages.
#     
#     Fixes: 9e343b467c70 ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses")
#     Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
#     Acked-by: Will Deacon <will@kernel.org>
#     Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/341688399c1b102756046d19ea6ce39db1ae4742.1592225558.git.christophe.leroy@csgroup.eu
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 b55129f97aeefd265314e12d98935330e011a14a
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mvme5100_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  mvme5100_defconfig
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mvme5100_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mvme5100_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mvme5100_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x445e0c) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_mvme5100_defconfig_powerpc-gcc4.9
# Build took: 0:00:58.661599