Kristof Provost 52bb6100e9 riscv: Fix copyin/copyout ... r343275 introduced a performance optimisation to the copyin/copyout routines by attempting to copy word-per-word rather than byte-per-byte where possible. This optimisation failed to account for cases where the buffer is longer than XLEN_BYTES, but due to misalignment does not not allow for any word-sized copies. E.g. a 9 byte buffer (with XLEN_BYTES == 8) which is misaligned by 2 bytes. The code nevertheless did a single full-word copy, which meant we copied too much data. This potentially clobbered other data. This is most easily demonstrated by a simple `sysctl -a`. Fix it by not assuming that we'll always have at least one full-word copy to do, but instead checking the remaining length first. Reviewed by: markj@, mhorne@, br@ (previous version) MFC after: 1 week Sponsored by: Axiado Differential Revision: https://reviews.freebsd.org/D21100		2019-07-29 14:59:14 +00:00
..
conf	sys: Remove DEV_RANDOM device option	2019-06-21 00:16:30 +00:00
include	RISC-V: expose extension bits in AT_HWCAP	2019-06-11 00:55:54 +00:00
riscv	riscv: Fix copyin/copyout	2019-07-29 14:59:14 +00:00