3 Commits

Author	SHA1	Message	Date
Heiko Carstens	d8ad075ef6	[S390] don't call handle_mm_fault() if in an atomic context. ... There are several places in the futex code where a spin_lock is held and still uaccesses happen. Deadlocks are avoided by increasing the preempt count. The pagefault handler will then not take any locks but will immediately search the fixup tables. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	2007-01-09 10:18:50 +01:00
Heiko Carstens	22155914b6	[S390] uaccess_pt: add missing down_read() and convert to is_init(). ... Doesn't seem to be a good idea to duplicate code :) Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	2006-12-08 15:53:49 +01:00
Gerald Schaefer	59f35d53fd	[S390] Add dynamic size check for usercopy functions. ... Use a wrapper for copy_to/from_user to chose the best usercopy method. The mvcos instruction is better for sizes greater than 256 bytes, if mvcos is not available a page table walk is better for sizes greater than 1024 bytes. Also removed the redundant copy_to/from_user_std_small functions. Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	2006-12-04 15:40:45 +01:00