# git rev-parse -q --verify 18f14afe281648e31ed35c9ad2fcb724c4838ad9^{commit}
18f14afe281648e31ed35c9ad2fcb724c4838ad9
already have revision, skipping fetch
# git checkout -q -f -B kisskb 18f14afe281648e31ed35c9ad2fcb724c4838ad9
# git clean -qxdf
# < git log -1
# commit 18f14afe281648e31ed35c9ad2fcb724c4838ad9
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Fri Dec 15 23:44:49 2023 +1100
# 
#     powerpc/64s: Increase default stack size to 32KB
#     
#     There are reports of kernels crashing due to stack overflow while
#     running OpenShift (Kubernetes). The primary contributor to the stack
#     usage seems to be openvswitch, which is used by OVN-Kubernetes (based on
#     OVN (Open Virtual Network)), but NFS also contributes in some stack
#     traces.
#     
#     There may be some opportunities to reduce stack usage in the openvswitch
#     code, but doing so potentially require tradeoffs vs performance, and
#     also requires testing across architectures.
#     
#     Looking at stack usage across the kernel (using -fstack-usage), shows
#     that ppc64le stack frames are on average 50-100% larger than the
#     equivalent function built for x86-64. Which is not surprising given the
#     minimum stack frame size is 32 bytes on ppc64le vs 16 bytes on x86-64.
#     
#     So increase the default stack size to 32KB for the modern 64-bit Book3S
#     platforms, ie. pseries (virtualised) and powernv (bare metal). That
#     leaves the older systems like G5s, and the AmigaOne (pasemi) with a 16KB
#     stack which should be sufficient on those machines.
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Signed-off-by: Aneesh Kumar K.V (IBM) <aneesh.kumar@kernel.org>
#     Link: https://msgid.link/20231215124449.317597-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-12.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-12.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 18f14afe281648e31ed35c9ad2fcb724c4838ad9
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc12 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-12.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64_defconfig
# Added to kconfig CONFIG_PPC_64K_PAGES=n
# Added to kconfig CONFIG_PPC_4K_PAGES=y
# Added to kconfig CONFIG_HUGETLBFS=n
# < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc12 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-12.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc12 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-12.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
.config:5015:warning: override: reassigning to symbol PPC_4K_PAGES
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc12 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-12.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_ppc64_defconfig+NO_HUGETLB+4K_PAGES_powerpc-gcc12
# Build took: 0:03:32.047349