# git rev-parse -q --verify 4d8cbf6dbcdaebe949461b0a933ae4c71cb53edc^{commit}
# git fetch -q -n -f https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/kspp
# git rev-parse -q --verify 4d8cbf6dbcdaebe949461b0a933ae4c71cb53edc^{commit}
4d8cbf6dbcdaebe949461b0a933ae4c71cb53edc
# git checkout -q -f -B kisskb 4d8cbf6dbcdaebe949461b0a933ae4c71cb53edc
# git clean -qxdf
# < git log -1
# commit 4d8cbf6dbcdaebe949461b0a933ae4c71cb53edc
# Author: Gustavo A. R. Silva <gustavoars@kernel.org>
# Date:   Fri Jul 14 13:56:37 2023 -0600
# 
#     fs: omfs: Use flexible-array member in struct omfs_extent
#     
#     Memory for 'struct omfs_extent' and a 'e_extent_count' number of extent
#     entries is indirectly allocated through 'bh->b_data', which is a pointer
#     to data within the page. This implies that the member 'e_entry'
#     (which is the start of extent entries) functions more like an array than
#     a single object of type 'struct omfs_extent_entry'.
#     
#     So we better turn this object into a proper array, in this case a
#     flexible-array member, and with that, fix the following
#     -Wstringop-overflow warning seen after building s390 architecture with
#     allyesconfig (GCC 13):
#     
#     fs/omfs/file.c: In function 'omfs_grow_extent':
#     include/linux/fortify-string.h:57:33: warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
#        57 | #define __underlying_memcpy     __builtin_memcpy
#           |                                 ^
#     include/linux/fortify-string.h:648:9: note: in expansion of macro '__underlying_memcpy'
#       648 |         __underlying_##op(p, q, __fortify_size);                        \
#           |         ^~~~~~~~~~~~~
#     include/linux/fortify-string.h:693:26: note: in expansion of macro '__fortify_memcpy_chk'
#       693 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
#           |                          ^~~~~~~~~~~~~~~~~~~~
#     fs/omfs/file.c:170:9: note: in expansion of macro 'memcpy'
#       170 |         memcpy(terminator, entry, sizeof(struct omfs_extent_entry));
#           |         ^~~~~~
#     In file included from fs/omfs/omfs.h:8,
#                      from fs/omfs/file.c:11:
#     fs/omfs/omfs_fs.h:80:34: note: at offset 16 into destination object 'e_entry' of size 16
#        80 |         struct omfs_extent_entry e_entry;       /* start of extent entries */
#           |                                  ^~~~~~~
#     
#     There are some binary differences before and after changes, but this are
#     expected due to the change in the size of 'struct omfs_extent' and the
#     necessary adjusments.
#     
#     This helps with the ongoing efforts to globally enable
#     -Wstringop-overflow.
#     
#     Link: https://github.com/KSPP/linux/issues/330
#     Reviewed-by: Kees Cook <keescook@chromium.org>
#     Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
# < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-ld --version
# < git log --format=%s --max-count=1 4d8cbf6dbcdaebe949461b0a933ae4c71cb53edc
# make -s -j 40 ARCH=m68k O=/kisskb/build/gustavoars_allmodconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  allmodconfig
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# < make -s -j 40 ARCH=m68k O=/kisskb/build/gustavoars_allmodconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  help
# make -s -j 40 ARCH=m68k O=/kisskb/build/gustavoars_allmodconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  olddefconfig
# make -s -j 40 ARCH=m68k O=/kisskb/build/gustavoars_allmodconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  
Completed OK
# rm -rf /kisskb/build/gustavoars_allmodconfig_m68k-gcc11
# Build took: 0:07:19.948072