# git rev-parse -q --verify 2a8c2c4e2cb5a5e9bf8f980ebec356ff8343d16e^{commit}
2a8c2c4e2cb5a5e9bf8f980ebec356ff8343d16e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 2a8c2c4e2cb5a5e9bf8f980ebec356ff8343d16e
# git clean -qxdf
# < git log -1
# commit 2a8c2c4e2cb5a5e9bf8f980ebec356ff8343d16e
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Sat Jan 11 19:20:49 2020 +0000
# 
#     powerpc/vdso: Switch VDSO to generic C implementation.
#     
#     For VDSO32 on PPC64, we create a fake 32 bits config, on the same
#     principle as MIPS architecture, in order to get the correct parts of
#     the different asm header files.
#     
#     With the C VDSO, the performance is slightly lower, but it is worth
#     it as it will ease maintenance and evolution, and also brings clocks
#     that are not supported with the ASM VDSO.
#     
#     On an 8xx at 132 MHz, vdsotest with the ASM VDSO:
#     gettimeofday:    vdso: 828 nsec/call
#     clock-getres-realtime-coarse:    vdso: 391 nsec/call
#     clock-gettime-realtime-coarse:    vdso: 614 nsec/call
#     clock-getres-realtime:    vdso: 460 nsec/call
#     clock-gettime-realtime:    vdso: 876 nsec/call
#     clock-getres-monotonic-coarse:    vdso: 399 nsec/call
#     clock-gettime-monotonic-coarse:    vdso: 691 nsec/call
#     clock-getres-monotonic:    vdso: 460 nsec/call
#     clock-gettime-monotonic:    vdso: 1026 nsec/call
#     
#     On an 8xx at 132 MHz, vdsotest with the C VDSO:
#     gettimeofday:    vdso: 955 nsec/call
#     clock-getres-realtime-coarse:    vdso: 545 nsec/call
#     clock-gettime-realtime-coarse:    vdso: 592 nsec/call
#     clock-getres-realtime:    vdso: 545 nsec/call
#     clock-gettime-realtime:    vdso: 941 nsec/call
#     clock-getres-monotonic-coarse:    vdso: 545 nsec/call
#     clock-gettime-monotonic-coarse:    vdso: 591 nsec/call
#     clock-getres-monotonic:    vdso: 545 nsec/call
#     clock-gettime-monotonic:    vdso: 940 nsec/call
#     
#     It is even better for gettime with monotonic clocks.
#     
#     Unsupported clocks with ASM VDSO:
#     clock-gettime-boottime:    vdso: 3851 nsec/call
#     clock-gettime-tai:    vdso: 3852 nsec/call
#     clock-gettime-monotonic-raw:    vdso: 3396 nsec/call
#     
#     Same clocks with C VDSO:
#     clock-gettime-tai:    vdso: 941 nsec/call
#     clock-gettime-monotonic-raw:    vdso: 1001 nsec/call
#     clock-gettime-monotonic-coarse:    vdso: 591 nsec/call
#     
#     On an 8321E at 333 MHz, vdsotest with the ASM VDSO:
#     gettimeofday:    vdso: 220 nsec/call
#     clock-getres-realtime-coarse:    vdso: 102 nsec/call
#     clock-gettime-realtime-coarse:    vdso: 178 nsec/call
#     clock-getres-realtime:    vdso: 129 nsec/call
#     clock-gettime-realtime:    vdso: 235 nsec/call
#     clock-getres-monotonic-coarse:    vdso: 105 nsec/call
#     clock-gettime-monotonic-coarse:    vdso: 208 nsec/call
#     clock-getres-monotonic:    vdso: 129 nsec/call
#     clock-gettime-monotonic:    vdso: 274 nsec/call
#     
#     On an 8321E at 333 MHz, vdsotest with the C VDSO:
#     gettimeofday:    vdso: 272 nsec/call
#     clock-getres-realtime-coarse:    vdso: 160 nsec/call
#     clock-gettime-realtime-coarse:    vdso: 184 nsec/call
#     clock-getres-realtime:    vdso: 166 nsec/call
#     clock-gettime-realtime:    vdso: 281 nsec/call
#     clock-getres-monotonic-coarse:    vdso: 160 nsec/call
#     clock-gettime-monotonic-coarse:    vdso: 184 nsec/call
#     clock-getres-monotonic:    vdso: 169 nsec/call
#     clock-gettime-monotonic:    vdso: 275 nsec/call
#     
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     ---
#     v7:
#     - Split out preparatory changes in a new preceding patch
#     - Added -fasynchronous-unwind-tables to CC flags.
#     
#     v6:
#     - Added missing prototypes in asm/vdso/gettimeofday.h for __c_kernel_ functions.
#     - Using STACK_FRAME_OVERHEAD instead of INT_FRAME_SIZE
#     - Rebased on powerpc/merge as of 7 Apr 2020
#     - Fixed build failure with gcc 9
#     - Added a patch to create asm/vdso/processor.h and more cpu_relax() in it
# < /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 2a8c2c4e2cb5a5e9bf8f980ebec356ff8343d16e
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/chleroy_ep8248e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ep8248e_defconfig
drivers/platform/Kconfig:17: can't open file "drivers/platform/saf3000/Kconfig"
make[2]: *** [/kisskb/src/scripts/kconfig/Makefile:88: ep8248e_defconfig] Error 1
make[1]: *** [/kisskb/src/Makefile:591: ep8248e_defconfig] Error 2
make: *** [Makefile:183: sub-make] Error 2
Command 'make -s -j 48 ARCH=powerpc O=/kisskb/build/chleroy_ep8248e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ep8248e_defconfig' returned non-zero exit status 2
# rm -rf /kisskb/build/chleroy_ep8248e_defconfig_powerpc-gcc5
# Build took: 0:00:01.547995