# git rev-parse -q --verify 249fad734a25889a4f23ed014d43634af6798063^{commit}
249fad734a25889a4f23ed014d43634af6798063
already have revision, skipping fetch
# git checkout -q -f -B kisskb 249fad734a25889a4f23ed014d43634af6798063
# git clean -qxdf
# < git log -1
# commit 249fad734a25889a4f23ed014d43634af6798063
# Author: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
# Date:   Mon Nov 18 09:14:52 2019 +0530
# 
#     powerpc/perf: Disable trace_imc pmu
#     
#     When a root user or a user with CAP_SYS_ADMIN privilege uses any
#     trace_imc performance monitoring unit events, to monitor application
#     or KVM threads, it may result in a checkstop (System crash).
#     
#     The cause is frequent switching of the "trace/accumulation" mode of
#     the In-Memory Collection hardware (LDBAR).
#     
#     This patch disables the trace_imc PMU unit entirely to avoid
#     triggering the checkstop. A future patch will reenable it at a later
#     stage once a workaround has been developed.
#     
#     Fixes: 012ae244845f ("powerpc/perf: Trace imc PMU functions")
#     Cc: stable@vger.kernel.org # v5.2+
#     Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
#     Tested-by: Hariharan T.S. <hari@linux.ibm.com>
#     [mpe: Add pr_info_once() so dmesg shows the PMU has been disabled]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191118034452.9939-1-maddy@linux.vnet.ibm.com
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 249fad734a25889a4f23ed014d43634af6798063
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  mpc885_ads_defconfig
# Added to kconfig CONFIG_HUGETLBFS=y
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1377:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
WARNING: vmlinux.o(.text+0xbca8): Section mismatch in reference from the function mmu_mark_initmem_nx() to the function .init.text:mmu_mapin_ram_chunk()
The function mmu_mark_initmem_nx() references
the function __init mmu_mapin_ram_chunk().
This is often because mmu_mark_initmem_nx lacks a __init 
annotation or the annotation of mmu_mapin_ram_chunk is wrong.

WARNING: vmlinux.o(.text+0xbcc0): Section mismatch in reference from the function mmu_mark_initmem_nx() to the function .init.text:mmu_mapin_ram_chunk()
The function mmu_mark_initmem_nx() references
the function __init mmu_mapin_ram_chunk().
This is often because mmu_mark_initmem_nx lacks a __init 
annotation or the annotation of mmu_mapin_ram_chunk is wrong.

WARNING: vmlinux.o(.text+0xbcd8): Section mismatch in reference from the function mmu_mark_initmem_nx() to the function .init.text:mmu_mapin_ram_chunk()
The function mmu_mark_initmem_nx() references
the function __init mmu_mapin_ram_chunk().
This is often because mmu_mark_initmem_nx lacks a __init 
annotation or the annotation of mmu_mapin_ram_chunk is wrong.

Image Name:   Linux-5.4.0-g249fad734a25
Created:      Fri Dec  6 03:32:29 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    1780018 Bytes = 1738.30 KiB = 1.70 MiB
Load Address: 00400000
Entry Point:  004001dc
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_mpc885_ads_defconfig+HUGETLB_powerpc-gcc4.6
# Build took: 0:00:43.675352