# git rev-parse -q --verify 26bc672134241a080a83b2ab9aa8abede8d30e1c^{commit}
26bc672134241a080a83b2ab9aa8abede8d30e1c
already have revision, skipping fetch
# git checkout -q -f -B kisskb 26bc672134241a080a83b2ab9aa8abede8d30e1c
# git clean -qxdf
# < git log -1
# commit 26bc672134241a080a83b2ab9aa8abede8d30e1c
# Merge: 7111fa1151e3 fa729c4df558
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Nov 5 09:44:02 2019 -0800
# 
#     Merge tag 'for-linus-2019-11-05' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
#     
#     Pull clone3 stack argument update from Christian Brauner:
#      "This changes clone3() to do basic stack validation and to set up the
#       stack depending on whether or not it is growing up or down.
#     
#       With clone3() the expectation is now very simply that the .stack
#       argument points to the lowest address of the stack and that
#       .stack_size specifies the initial stack size. This is diferent from
#       legacy clone() where the "stack" argument had to point to the lowest
#       or highest address of the stack depending on the architecture.
#     
#       clone3() was released with 5.3. Currently, it is not documented and
#       very unclear to userspace how the stack and stack_size argument have
#       to be passed. After talking to glibc folks we concluded that changing
#       clone3() to determine stack direction and doing basic validation is
#       the right course of action.
#     
#       Note, this is a potentially user visible change. In the very unlikely
#       case, that it breaks someone's use-case we will revert. (And then e.g.
#       place the new behavior under an appropriate flag.)
#     
#       Note that passing an empty stack will continue working just as before.
#       Breaking someone's use-case is very unlikely. Neither glibc nor musl
#       currently expose a wrapper for clone3(). There is currently also no
#       real motivation for anyone to use clone3() directly. First, because
#       using clone{3}() with stacks requires some assembly (see glibc and
#       musl). Second, because it does not provide features that legacy
#       clone() doesn't. New features for clone3() will first happen in v5.5
#       which is why v5.4 is still a good time to try and make that change now
#       and backport it to v5.3.
#     
#       I did a codesearch on https://codesearch.debian.net, github, and
#       gitlab and could not find any software currently relying directly on
#       clone3(). I expect this to change once we land CLONE_CLEAR_SIGHAND
#       which was a request coming from glibc at which point they'll likely
#       start using it"
#     
#     * tag 'for-linus-2019-11-05' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
#       clone3: validate stack arguments
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-ld --version
# < git log --format=%s --max-count=1 26bc672134241a080a83b2ab9aa8abede8d30e1c
# < make -s -j 80 ARCH=arm O=/kisskb/build/linus_imx_v4_v5_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  imx_v4_v5_defconfig
# make -s -j 80 ARCH=arm O=/kisskb/build/linus_imx_v4_v5_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:121:34: warning: 'levelspread[<U91e0>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U91e0>]' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/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/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2591:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1852:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/sound/soc/fsl/fsl_ssi.c: In function 'fsl_ssi_hw_params':
/kisskb/src/sound/soc/fsl/fsl_ssi.c:769:7: warning: 'baudrate' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/sound/soc/fsl/fsl_ssi.c:680:25: note: 'baudrate' was declared here
/kisskb/src/drivers/usb/core/devio.c: In function 'async_completed':
/kisskb/src/drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
WARNING: "return_address" [vmlinux] is a static EXPORT_SYMBOL_GPL
Completed OK
# rm -rf /kisskb/build/linus_imx_v4_v5_defconfig_arm
# Build took: 0:00:56.765936