Buildresult: powerpc-next/arm64-defconfig/arm64-gcc5 built on Jul 3 2018, 01:45

kisskb

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Status:	OK
Date/Time:	Jul 3 2018, 01:45
Duration:	0:03:30.971002
Builder:	ka2
Revision:	ocxl: Fix page fault handler in case of fault on dying process (`d497ebf5fb3a026c0817f8c96cde578787f24093)`
Target:	powerpc-next/arm64-defconfig/arm64-gcc5
Branch:	powerpc-next
Compiler:	arm64-gcc5 (aarch64-linux-gcc.br_real (Buildroot 2016.11-git-00613-ge98b4dd) 5.4.0)
Config:	defconfig (download)
Log:	Download original Possible warnings (1) <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp] Full Log # 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/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version # < git log --format=%s --max-count=1 d497ebf5fb3a026c0817f8c96cde578787f24093 # < make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-next_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux- defconfig # make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-next_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux- arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum arch/arm64/Makefile:40: LSE atomics not supported by binutils <stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp] Completed OK # rm -rf /kisskb/build/powerpc-next_arm64-defconfig_arm64 # Build took: 0:03:30.971002

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