ce282b868b
Summary: Some architectures (powerpc Book-E) have a vm_paddr_t larger than intptr_t. Casting from the intptr_t to vm_paddr_t causes sign extension, leading to a potentially invalid address. This was seen when running X on a PowerPC P1022 machine, which mapped the backing framebuffer at 0xc1800000. When mmap()d by X, this yielded an invalid address of 0xffffffffc1800000, or, as the hardware would see it, 0xfc1800000. Reviewed By: ray Differential Revision: https://reviews.freebsd.org/D13332