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The ARM patch that was added in commit94841d87fd("libdrm: fix support for xserver with Vivante drivers") makes the assumption that ldrex/strex is available on ARM. While this is true on ARMv6+, it is not true on ARMv4/ARMv5. Due to this, we had to make follow-up commits like7bac31ceea("package/x11r7/xserver_xorg-server: dri needs arm >= v6") and more is needed in the reverse dependencies to disable DRI usage on ARMv4/ARMv5. In fact, it turns out that the CAS code in libdrm is only an optimization, and it will gracefully fall back to a system call based lock/unlock mechanism. So we simply change the patch to only provide the optimized CAS implementation on ARMv6+. The original reason for this patch was to fix Vivante drivers, and Vivante GPUs are only used in ARMv6+ cores, so we should be fine (famous last words). Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>