b93ffafdc79e11c1d0a04a85abf73ab0652fc482
Prefer using memfd_create() for the ring buffer. We were using /dev/shm, but this won't work on systems that either don't have /dev/shm or have mounted it with noexec, because for everything other than gfx700 we map the ring buffer with PROT_EXEC. memfd_create() is Linux specific and was added in Linux 3.17, so we will fallback to using /dev/shm on systems where memfd_create() is not available. Change-Id: I58fb533eebc362f6d29dc3e316a80801014d50e8
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