# git rev-parse -q --verify 7c1bb6bbf75d8ca5ec878627d3170effcaf54f27^{commit}
7c1bb6bbf75d8ca5ec878627d3170effcaf54f27
already have revision, skipping fetch
# git checkout -q -f -B kisskb 7c1bb6bbf75d8ca5ec878627d3170effcaf54f27
# git clean -qxdf
# < git log -1
# commit 7c1bb6bbf75d8ca5ec878627d3170effcaf54f27
# Author: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
# Date:   Thu Sep 5 23:50:30 2019 +0530
# 
#     powerpc: Use ftrace_graph_ret_addr() when unwinding
#     
#     With support for HAVE_FUNCTION_GRAPH_RET_ADDR_PTR,
#     ftrace_graph_ret_addr() provides more robust unwinding when function
#     graph is in use. Update show_stack() to use the same.
#     
#     With dump_stack() added to sysrq_sysctl_handler(), before this patch:
#       root@(none):/sys/kernel/debug/tracing# cat /proc/sys/kernel/sysrq
#       CPU: 0 PID: 218 Comm: cat Not tainted 5.3.0-rc7-00868-g8453ad4a078c-dirty #20
#       Call Trace:
#       [c0000000d1e13c30] [c00000000006ab98] return_to_handler+0x0/0x40 (dump_stack+0xe8/0x164) (unreliable)
#       [c0000000d1e13c80] [c000000000145680] sysrq_sysctl_handler+0x48/0xb8
#       [c0000000d1e13cd0] [c00000000006ab98] return_to_handler+0x0/0x40 (proc_sys_call_handler+0x274/0x2a0)
#       [c0000000d1e13d60] [c00000000006ab98] return_to_handler+0x0/0x40 (return_to_handler+0x0/0x40)
#       [c0000000d1e13d80] [c00000000006ab98] return_to_handler+0x0/0x40 (__vfs_read+0x3c/0x70)
#       [c0000000d1e13dd0] [c00000000006ab98] return_to_handler+0x0/0x40 (vfs_read+0xb8/0x1b0)
#       [c0000000d1e13e20] [c00000000006ab98] return_to_handler+0x0/0x40 (ksys_read+0x7c/0x140)
#     
#     After this patch:
#       Call Trace:
#       [c0000000d1e33c30] [c00000000006ab58] return_to_handler+0x0/0x40 (dump_stack+0xe8/0x164) (unreliable)
#       [c0000000d1e33c80] [c000000000145680] sysrq_sysctl_handler+0x48/0xb8
#       [c0000000d1e33cd0] [c00000000006ab58] return_to_handler+0x0/0x40 (proc_sys_call_handler+0x274/0x2a0)
#       [c0000000d1e33d60] [c00000000006ab58] return_to_handler+0x0/0x40 (__vfs_read+0x3c/0x70)
#       [c0000000d1e33d80] [c00000000006ab58] return_to_handler+0x0/0x40 (vfs_read+0xb8/0x1b0)
#       [c0000000d1e33dd0] [c00000000006ab58] return_to_handler+0x0/0x40 (ksys_read+0x7c/0x140)
#       [c0000000d1e33e20] [c00000000006ab58] return_to_handler+0x0/0x40 (system_call+0x5c/0x68)
#     
#     Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/dc89c9a887121342d9c7819482c3dabdece2a323.1567707399.git.naveen.n.rao@linux.vnet.ibm.com
# < /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 7c1bb6bbf75d8ca5ec878627d3170effcaf54f27
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-next_40x_obs600_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/obs600_defconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-next_40x_obs600_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/kernel/head_40x.S: Assembler messages:
/kisskb/src/arch/powerpc/kernel/head_40x.S:802: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x4bbe9c) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-5.3.0-rc2-g7c1bb6bbf75d
Created:      Thu Sep 19 00:59:48 2019
Image Type:   PowerPC Linux Multi-File Image (gzip compressed)
Data Size:    2442690 Bytes = 2385.44 KiB = 2.33 MiB
Load Address: 00000000
Entry Point:  00000000
Contents:
   Image 0: 2435804 Bytes = 2378.71 KiB = 2.32 MiB
   Image 1: 3 Bytes = 0.00 KiB = 0.00 MiB
   Image 2: 6866 Bytes = 6.71 KiB = 0.01 MiB
Completed OK
# rm -rf /kisskb/build/powerpc-next_40x_obs600_defconfig_powerpc-gcc5
# Build took: 0:00:22.718850