From: Dave Airlie <airlied@xxxxxxxx> Date: Sat, 26 May 2007 21:32:10 +0100 (IST) > the DRM can use cmpxchg in userspace, to implement DRM_CAS, have a look in > drm git libdrm/xf86drm.h we appear to have a sparc implementation, this > gives us fast userspace locking, however if an arch doesn't implement > DRM_CAS we fallback to the heavyweight in-kernel lock, That instruction only works on sparc64 cpus, which includes 32-bit apps running a system with sparc64 cpus. That's why I hard-code the opcode in that asm statement of the DRM sources. - To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
