# git rev-parse -q --verify e8c42ba3ffd9708cc2fab3fb57deeb1604202e7e^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git next-test
# git rev-parse -q --verify e8c42ba3ffd9708cc2fab3fb57deeb1604202e7e^{commit}
e8c42ba3ffd9708cc2fab3fb57deeb1604202e7e
# git checkout -q -f -B kisskb e8c42ba3ffd9708cc2fab3fb57deeb1604202e7e
# git clean -qxdf
# < git log -1
# commit e8c42ba3ffd9708cc2fab3fb57deeb1604202e7e
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Mon Aug 19 06:40:25 2019 +0000
# 
#     powerpc/603: Fix handling of the DIRTY flag
#     
#     If a page is already mapped RW without the DIRTY flag, the DIRTY
#     flag is never set and a TLB store miss exception is taken forever.
#     
#     This is easily reproduced with the following app:
#     
#     void main(void)
#     {
#             volatile char *ptr = mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
#     
#             *ptr = *ptr;
#     }
#     
#     When DIRTY flag is not set, bail out of TLB miss handler and take
#     a minor page fault which will set the DIRTY flag.
#     
#     Fixes: f8b58c64eaef ("powerpc/603: let's handle PAGE_DIRTY directly")
#     Cc: stable@vger.kernel.org # v5.1+
#     Reported-by: Doug Crawford <doug.crawford@intelight-its.com>
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/80432f71194d7ee75b2f5043ecf1501cf1cca1f3.1566196646.git.christophe.leroy@c-s.fr
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-ld --version
# < git log --format=%s --max-count=1 e8c42ba3ffd9708cc2fab3fb57deeb1604202e7e
# < make -s -j 24 ARCH=alpha O=/kisskb/build/powerpc-next_alpha-defconfig_alpha CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-  defconfig
# make -s -j 24 ARCH=alpha O=/kisskb/build/powerpc-next_alpha-defconfig_alpha CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/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/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
WARNING: "saved_config" [vmlinux] is COMMON symbol
  Kernel arch/alpha/boot/vmlinux.gz is ready
Completed OK
# rm -rf /kisskb/build/powerpc-next_alpha-defconfig_alpha
# Build took: 0:00:56.261615