# git rev-parse -q --verify 642e7fd23353e22290e3d51719fcb658dc252342^{commit}
642e7fd23353e22290e3d51719fcb658dc252342
already have revision, skipping fetch
# git checkout -q -f -B kisskb 642e7fd23353e22290e3d51719fcb658dc252342
# git clean -qxdf
# < git log -1
# commit 642e7fd23353e22290e3d51719fcb658dc252342
# Merge: 2103596 c9a2119
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Apr 2 21:22:12 2018 -0700
# 
#     Merge branch 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux
#     
#     Pull removal of in-kernel calls to syscalls from Dominik Brodowski:
#      "System calls are interaction points between userspace and the kernel.
#       Therefore, system call functions such as sys_xyzzy() or
#       compat_sys_xyzzy() should only be called from userspace via the
#       syscall table, but not from elsewhere in the kernel.
#     
#       At least on 64-bit x86, it will likely be a hard requirement from
#       v4.17 onwards to not call system call functions in the kernel: It is
#       better to use use a different calling convention for system calls
#       there, where struct pt_regs is decoded on-the-fly in a syscall wrapper
#       which then hands processing over to the actual syscall function. This
#       means that only those parameters which are actually needed for a
#       specific syscall are passed on during syscall entry, instead of
#       filling in six CPU registers with random user space content all the
#       time (which may cause serious trouble down the call chain). Those
#       x86-specific patches will be pushed through the x86 tree in the near
#       future.
#     
#       Moreover, rules on how data may be accessed may differ between kernel
#       data and user data. This is another reason why calling sys_xyzzy() is
#       generally a bad idea, and -- at most -- acceptable in arch-specific
#       code.
#     
#       This patchset removes all in-kernel calls to syscall functions in the
#       kernel with the exception of arch/. On top of this, it cleans up the
#       three places where many syscalls are referenced or prototyped, namely
#       kernel/sys_ni.c, include/linux/syscalls.h and include/linux/compat.h"
#     
#     * 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux: (109 commits)
#       bpf: whitelist all syscalls for error injection
#       kernel/sys_ni: remove {sys_,sys_compat} from cond_syscall definitions
#       kernel/sys_ni: sort cond_syscall() entries
#       syscalls/x86: auto-create compat_sys_*() prototypes
#       syscalls: sort syscall prototypes in include/linux/compat.h
#       net: remove compat_sys_*() prototypes from net/compat.h
#       syscalls: sort syscall prototypes in include/linux/syscalls.h
#       kexec: move sys_kexec_load() prototype to syscalls.h
#       x86/sigreturn: use SYSCALL_DEFINE0
#       x86: fix sys_sigreturn() return type to be long, not unsigned long
#       x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
#       mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()
#       mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()
#       mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()
#       fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate()
#       fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscalls
#       fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()
#       fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall
#       kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()
#       kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare()
#       ...
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < git log --format=%s --max-count=1 642e7fd23353e22290e3d51719fcb658dc252342
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_pseries_defconfig+NO_SPLPAR_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  pseries_defconfig
# Added to kconfig CONFIG_PPC_SPLPAR=n
# yes \n | make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_pseries_defconfig+NO_SPLPAR_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_pseries_defconfig+NO_SPLPAR_powerpc 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:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/bridge/br_netlink.c: In function 'br_afspec':
/kisskb/src/net/bridge/br_netlink.c:635:7: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc':
/kisskb/src/fs/nfsd/nfs4xdr.c:2043:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/swap_state.c: In function '__add_to_swap_cache':
/kisskb/src/mm/swap_state.c:135:5: warning: 'error' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1440:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1822:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1732:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:231:19: note: 'i' was declared here
WARNING: modpost: Found 2 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
Completed OK
# rm -rf /kisskb/build/linus_pseries_defconfig+NO_SPLPAR_powerpc
# Build took: 0:02:03.489917