# 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-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-gcc --version
# < git log --format=%s --max-count=1 d497ebf5fb3a026c0817f8c96cde578787f24093
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_allmodconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-  allmodconfig
# Added to kconfig CONFIG_CPU_LITTLE_ENDIAN=y
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_allmodconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_allmodconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-  
/kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter.
/kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter.
In file included from /kisskb/src/include/linux/io.h:25:0,
                 from /kisskb/src/include/linux/of_address.h:7,
                 from /kisskb/src/drivers/ata/ahci_qoriq.c:18:
/kisskb/src/drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
/kisskb/src/arch/powerpc/include/asm/io.h:160:2: warning: 'px_is' may be used uninitialized in this function [-Wmaybe-uninitialized]
  __asm__ __volatile__("sync;"#insn"%U0%X0 %1,%0"   \
  ^
/kisskb/src/drivers/ata/ahci_qoriq.c:86:14: note: 'px_is' was declared here
  u32 px_cmd, px_is, px_val;
              ^
In file included from /kisskb/src/include/linux/io.h:25:0,
                 from /kisskb/src/include/linux/of_address.h:7,
                 from /kisskb/src/drivers/ata/ahci_qoriq.c:18:
/kisskb/src/arch/powerpc/include/asm/io.h:160:2: warning: 'px_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]
  __asm__ __volatile__("sync;"#insn"%U0%X0 %1,%0"   \
  ^
/kisskb/src/drivers/ata/ahci_qoriq.c:86:6: note: 'px_cmd' was declared here
  u32 px_cmd, px_is, px_val;
      ^
WARNING: vmlinux.o(.text+0x36b4): Section mismatch in reference from the variable __boot_from_prom to the function .init.text:prom_init()
The function __boot_from_prom() references
the function __init prom_init().
This is often because __boot_from_prom lacks a __init 
annotation or the annotation of prom_init is wrong.

WARNING: vmlinux.o(.text+0x3944): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:early_setup()
The function start_here_multiplatform() references
the function __init early_setup().
This is often because start_here_multiplatform lacks a __init 
annotation or the annotation of early_setup is wrong.

WARNING: vmlinux.o(.text+0x3978): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel()
The function start_here_common() references
the function __init start_kernel().
This is often because start_here_common lacks a __init 
annotation or the annotation of start_kernel is wrong.

Completed OK
# rm -rf /kisskb/build/powerpc-next_allmodconfig+ppc64le_ppc64le
# Build took: 0:12:30.798007