# git rev-parse -q --verify 736706bee3298208343a76096370e4f6a5c55915^{commit}
736706bee3298208343a76096370e4f6a5c55915
already have revision, skipping fetch
# git checkout -q -f -B kisskb 736706bee3298208343a76096370e4f6a5c55915
# git clean -qxdf
# < git log -1
# commit 736706bee3298208343a76096370e4f6a5c55915
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Mar 4 10:39:05 2019 -0800
# 
#     get rid of legacy 'get_ds()' function
#     
#     Every in-kernel use of this function defined it to KERNEL_DS (either as
#     an actual define, or as an inline function).  It's an entirely
#     historical artifact, and long long long ago used to actually read the
#     segment selector valueof '%ds' on x86.
#     
#     Which in the kernel is always KERNEL_DS.
#     
#     Inspired by a patch from Jann Horn that just did this for a very small
#     subset of users (the ones in fs/), along with Al who suggested a script.
#     I then just took it to the logical extreme and removed all the remaining
#     gunk.
#     
#     Roughly scripted with
#     
#        git grep -l '(get_ds())' -- :^tools/ | xargs sed -i 's/(get_ds())/(KERNEL_DS)/'
#        git grep -lw 'get_ds' -- :^tools/ | xargs sed -i '/^#define get_ds()/d'
#     
#     plus manual fixups to remove a few unusual usage patterns, the couple of
#     inline function cases and to fix up a comment that had become stale.
#     
#     The 'get_ds()' function remains in an x86 kvm selftest, since in user
#     space it actually does something relevant.
#     
#     Inspired-by: Jann Horn <jannh@google.com>
#     Inspired-by: Al Viro <viro@zeniv.linux.org.uk>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 736706bee3298208343a76096370e4f6a5c55915
# < make -s -j 120 ARCH=x86_64 O=/kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-  allnoconfig
# make -s -j 120 ARCH=x86_64 O=/kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/arch/x86/kernel/apic/io_apic.c: In function 'mp_map_pin_to_irq':
/kisskb/src/arch/x86/kernel/apic/io_apic.c:1034:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/arch/x86/kernel/e820.c: In function 'e820__setup_pci_gap':
/kisskb/src/arch/x86/kernel/e820.c:650:16: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/linus_x86_64-allnoconfig_x86_64-gcc4.6
# Build took: 0:00:09.718901