# 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-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 18f14afe281648e31ed35c9ad2fcb724c4838ad9
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  mpc85xx_defconfig
Using /kisskb/src/arch/powerpc/configs/mpc85xx_base.config as base
Merging /kisskb/src/arch/powerpc/configs/85xx-32bit.config
Merging /kisskb/src/arch/powerpc/configs/85xx-hw.config
Merging /kisskb/src/arch/powerpc/configs/fsl-emb-nonhw.config
#
# merged configuration written to .config (needs make)
#
# < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/include/linux/build_bug.h:5:0,
                 from /kisskb/src/include/linux/container_of.h:5,
                 from /kisskb/src/include/linux/list.h:5,
                 from /kisskb/src/include/linux/module.h:12,
                 from /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:15:
/kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: In function 'allocate_bd':
/kisskb/src/include/linux/err.h:28:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
                                                 ^
/kisskb/src/include/linux/compiler.h:77:42: note: in definition of macro 'unlikely'
 # define unlikely(x) __builtin_expect(!!(x), 0)
                                          ^
/kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:138:6: note: in expansion of macro 'IS_ERR_VALUE'
  if (IS_ERR_VALUE(fep->ring_mem_addr))
      ^
/kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: At top level:
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5
# Build took: 0:01:29.044087