# git rev-parse -q --verify f01ad0b9f2dcfd006e1fa77104fdf989980ff20f^{commit}
f01ad0b9f2dcfd006e1fa77104fdf989980ff20f
already have revision, skipping fetch
# git checkout -q -f -B kisskb f01ad0b9f2dcfd006e1fa77104fdf989980ff20f
# git clean -qxdf
# < git log -1
# commit f01ad0b9f2dcfd006e1fa77104fdf989980ff20f
# Author: Christophe Leroy <christophe.leroy@csgroup.eu>
# Date:   Thu Nov 18 10:39:53 2021 +0100
# 
#     powerpc/32: Fix hardlockup on vmap stack overflow
#     
#     Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not
#     activate MMU before reading task struct") a vmap stack overflow
#     results in a hard lockup. This is because emergency_ctx is still
#     addressed with its virtual address allthough data MMU is not active
#     anymore at that time.
#     
#     Fix it by using a physical address instead.
#     
#     Fixes: c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct")
#     Cc: stable@vger.kernel.org # v5.10+
#     Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/ce30364fb7ccda489272af4a1612b6aa147e1d23.1637227521.git.christophe.leroy@csgroup.eu
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 f01ad0b9f2dcfd006e1fa77104fdf989980ff20f
# < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  mpc85xx_defconfig
# Added to kconfig CONFIG_PPC_E500MC=y
# Added to kconfig CONFIG_VIRTUALIZATION=y
# Added to kconfig CONFIG_KVM_E500MC=y
# Added to kconfig 
# < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
.config:4301:warning: override: reassigning to symbol PPC_E500MC
.config:4302:warning: override: reassigning to symbol VIRTUALIZATION
# make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
<stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
In file included from /kisskb/src/include/linux/build_bug.h:5,
                 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:22:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
   22 | #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
      |                                                 ^
/kisskb/src/include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
   78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
      |                                             ^
/kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:139:13: note: in expansion of macro 'IS_ERR_VALUE'
  139 |         if (IS_ERR_VALUE(fep->ring_mem_addr))
      |             ^~~~~~~~~~~~
/kisskb/src/arch/powerpc/boot/dts/fsl/mpc8541cds.dts:341.15-350.5: Warning (pci_device_reg): /pci@e0008000/i8259@19000: PCI unit address format error, expected "12,0"
/kisskb/src/arch/powerpc/boot/dts/fsl/mpc8541cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0)
/kisskb/src/arch/powerpc/boot/dts/fsl/mpc8555cds.dts:341.15-350.5: Warning (pci_device_reg): /pci@e0008000/i8259@19000: PCI unit address format error, expected "12,0"
/kisskb/src/arch/powerpc/boot/dts/fsl/mpc8555cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_mpc85xx_defconfig+KVM_powerpc-gcc11
# Build took: 0:01:48.758048