# 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/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 faa6d21153fd11e139dd880044521389b34a24f2
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_iss476-smp_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  44x/iss476-smp_defconfig

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
# make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_iss476-smp_defconfig_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:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[<Ud140>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<Ud140>]' was declared here
/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/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here
INFO: Uncompressed kernel (size 0x621554) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
INFO: Uncompressed kernel (size 0x621554) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_44x_iss476-smp_defconfig_powerpc-gcc4.6
# Build took: 0:00:52.957095