# git rev-parse -q --verify a816fd6b49b6b0628b968faefd49a6de4ce27066^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
warning: The last gc run reported the following. Please correct the root cause
and remove .git/gc.log.
Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

# git rev-parse -q --verify a816fd6b49b6b0628b968faefd49a6de4ce27066^{commit}
a816fd6b49b6b0628b968faefd49a6de4ce27066
# git checkout -q -f -B kisskb a816fd6b49b6b0628b968faefd49a6de4ce27066
# git clean -qxdf
# < git log -1
# commit a816fd6b49b6b0628b968faefd49a6de4ce27066
# Merge: 4a3164e3d7be 556a888a14af
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Apr 2 20:24:32 2019 -1000
# 
#     Merge tag 'pidfd-fixes-v5.1-rc3' of gitolite.kernel.org:pub/scm/linux/kernel/git/brauner/linux
#     
#     Pull pidfd fix from Christian Brauner:
#      "This should be an uncontroversial fix for pidfd_send_signal() by Jann
#       to better align it's behavior with other signal sending functions:
#     
#       In one of the early versions of the patchset it was suggested to not
#       unconditionally error out when a signal with SI_USER is sent to a
#       non-current task (cf. [1]).
#     
#       Instead, pidfd_send_signal() currently silently changes this to a
#       regular kill signal. While this is technically fine, the semantics are
#       weird since the kernel just silently converts a user's request behind
#       their back and also no other signal sending function allows to do
#       this. It gets more hairy when we introduce sending signals to a
#       specific thread soon.
#     
#       So let's align pidfd_send_signal() with all the other signal sending
#       functions and error out when SI_USER signals are sent to a non-current
#       task"
#     
#     * tag 'pidfd-fixes-v5.1-rc3' of gitolite.kernel.org:pub/scm/linux/kernel/git/brauner/linux:
#       signal: don't silently convert SI_USER signals to non-current pidfd
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-ld --version
# < git log --format=%s --max-count=1 a816fd6b49b6b0628b968faefd49a6de4ce27066
# < make -s -j 8 ARCH=s390 O=/kisskb/build/linus_s390-allnoconfig_s390x CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-  allnoconfig
# make -s -j 8 ARCH=s390 O=/kisskb/build/linus_s390-allnoconfig_s390x CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-  
<stdin>:1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp]
<stdin>:1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp]
<stdin>:1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp]
<stdin>:1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:187:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/arch/s390/mm/pgtable.c:413:15: warning: 'pmd_alloc_map' defined but not used [-Wunused-function]
/kisskb/src/arch/s390/kernel/machine_kexec.c:145:22: warning: 'do_start_kdump' defined but not used [-Wunused-function]
Completed OK
# rm -rf /kisskb/build/linus_s390-allnoconfig_s390x
# Build took: 0:03:34.343249