# git rev-parse -q --verify faa6d21153fd11e139dd880044521389b34a24f2^{commit}
faa6d21153fd11e139dd880044521389b34a24f2
already have revision, skipping fetch
# git checkout -q -f -B kisskb faa6d21153fd11e139dd880044521389b34a24f2
# git clean -qxdf
# < git log -1
# commit faa6d21153fd11e139dd880044521389b34a24f2
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Tue Sep 3 18:04:52 2019 +0530
# 
#     powerpc/nvdimm: use H_SCM_QUERY hcall on H_OVERLAP error
#     
#     Right now we force an unbind of SCM memory at drcindex on H_OVERLAP error.
#     This really slows down operations like kexec where we get the H_OVERLAP
#     error because we don't go through a full hypervisor re init.
#     
#     H_OVERLAP error for a H_SCM_BIND_MEM hcall indicates that SCM memory at
#     drc index is already bound. Since we don't specify a logical memory
#     address for bind hcall, we can use the H_SCM_QUERY hcall to query
#     the already bound logical address.
#     
#     Boot time difference with and without patch is:
#     
#     [    5.583617] IOMMU table initialized, virtual merging enabled
#     [    5.603041] papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Retrying bind after unbinding
#     [  301.514221] papr_scm ibm,persistent-memory:ibm,pmemory@44108001: Retrying bind after unbinding
#     [  340.057238] hv-24x7: read 1530 catalog entries, created 537 event attrs (0 failures), 275 descs
#     
#     after fix
#     
#     [    5.101572] IOMMU table initialized, virtual merging enabled
#     [    5.116984] papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Querying SCM details
#     [    5.117223] papr_scm ibm,persistent-memory:ibm,pmemory@44108001: Querying SCM details
#     [    5.120530] hv-24x7: read 1530 catalog entries, created 537 event attrs (0 failures), 275 descs
#     
#     Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20190903123452.28620-2-aneesh.kumar@linux.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 faa6d21153fd11e139dd880044521389b34a24f2
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_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 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_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 0x4c1f38) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-5.3.0-gfaa6d21153fd
Created:      Wed Sep 25 13:46:59 2019
Image Type:   PowerPC Linux Multi-File Image (gzip compressed)
Data Size:    2451778 Bytes = 2394.31 KiB = 2.34 MiB
Load Address: 00000000
Entry Point:  00000000
Contents:
   Image 0: 2444892 Bytes = 2387.59 KiB = 2.33 MiB
   Image 1: 2 Bytes = 0.00 KiB = 0.00 MiB
   Image 2: 6866 Bytes = 6.71 KiB = 0.01 MiB
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_40x_obs600_defconfig_powerpc-gcc5
# Build took: 0:00:46.026621