# git rev-parse -q --verify d497ebf5fb3a026c0817f8c96cde578787f24093^{commit}
d497ebf5fb3a026c0817f8c96cde578787f24093
already have revision, skipping fetch
# git checkout -q -f -B kisskb d497ebf5fb3a026c0817f8c96cde578787f24093
# git clean -qxdf
# < git log -1
# commit d497ebf5fb3a026c0817f8c96cde578787f24093
# Author: Frederic Barrat <fbarrat@linux.ibm.com>
# Date:   Mon Jun 18 14:14:36 2018 +0200
# 
#     ocxl: Fix page fault handler in case of fault on dying process
#     
#     If a process exits without doing proper cleanup, there's a window
#     where an opencapi device can try to access the memory of the dying
#     process and may trigger a page fault. That's an expected scenario and
#     the ocxl driver holds a reference on the mm_struct of the process
#     until the opencapi device is notified of the process exiting.
#     However, if mm_users is already at 0, i.e. the address space of the
#     process has already been destroyed, the driver shouldn't try resolving
#     the page fault, as it will fail, but it can also try accessing already
#     freed data.
#     
#     It is fixed by only calling the bottom half of the page fault handler
#     if mm_users is greater than 0 and get a reference on mm_users instead
#     of mm_count. Otherwise, we can safely return a translation fault to
#     the device, as its associated memory context is being removed. The
#     opencapi device will be properly cleaned up shortly after when closing
#     the file descriptors.
#     
#     Fixes: 5ef3166e8a32 ("ocxl: Driver code for 'generic' opencapi devices")
#     Cc: stable@vger.kernel.org # v4.16+
#     Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
#     Reviewed-By: Alastair D'Silva <alastair@d-silva.org>
#     Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version
# < git log --format=%s --max-count=1 d497ebf5fb3a026c0817f8c96cde578787f24093
# < make -s -j 48 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  defconfig
# make -s -j 48 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  
/kisskb/src/arch/mips/vdso/Makefile:32: MIPS VDSO requires binutils >= 2.25
/kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter.
/kisskb/src/arch/mips/vdso/Makefile:32: MIPS VDSO requires binutils >= 2.25
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1256:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:146:32: warning: 'levelspread[<U4960>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:94:6: note: 'levelspread[<U4960>]' was declared here
/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/Makefile:24: CC cannot link executables. Skipping bpfilter.
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1819:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2497:6: warning: 'ret' 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:339:21: note: 'pdeo' was declared here
/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
/kisskb/src/arch/mips/vdso/Makefile:32: MIPS VDSO requires binutils >= 2.25
/kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter.
/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]
FIT description: Linux 4.18.0-rc3-gd497ebf
Created:         Tue Jul  3 01:26:18 2018
 Image 0 (kernel@0)
  Description:  Linux 4.18.0-rc3-gd497ebf
  Created:      Tue Jul  3 01:26:18 2018
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4335997 Bytes = 4234.37 kB = 4.14 MB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x8082fb50
  Hash algo:    sha1
  Hash value:   41f39e6afe0b77c24ebbf9e5b02179212b629f90
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Tue Jul  3 01:26:18 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    3668 Bytes = 3.58 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   569c37cc891ce1e1f3a193cb41cc691a5d2debb5
 Image 2 (fdt@ni169445)
  Description:  NI 169445 device tree
  Created:      Tue Jul  3 01:26:18 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    1871 Bytes = 1.83 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   51b89b31605ee62038c8468c429af091dfc75ec7
 Image 3 (fdt@xilfpga)
  Description:  MIPSfpga (xilfpga) Device Tree
  Created:      Tue Jul  3 01:26:18 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    2708 Bytes = 2.64 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   509ce58e44c561d54539e64e9d4b47054e696fc6
 Default Configuration: 'conf@default'
 Configuration 0 (conf@default)
  Description:  Generic Linux kernel
  Kernel:       kernel@0
 Configuration 1 (conf@boston)
  Description:  Boston Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@boston
 Configuration 2 (conf@ni169445)
  Description:  NI 169445 Linux Kernel
  Kernel:       kernel@0
  FDT:          fdt@ni169445
 Configuration 3 (conf@xilfpga)
  Description:  MIPSfpga Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@xilfpga
Completed OK
# rm -rf /kisskb/build/powerpc-next_mips-defconfig_mips
# Build took: 0:01:40.607205