4 Commits

Author	SHA1	Message	Date
Vineet Gupta	91e040a79d	ARC: syscall for userspace cmpxchg assist ... Older ARC700 cores (ARC750 specifically) lack instructions to implement atomic r-w-w. This is problematic for userspace libraries such as NPTL which need atomic primitives. So enable them by providing kernel assist. This is costly but really the only sane soluton (othern than tight spinning using the otherwise availiable atomic exchange EX instruciton). Good thing is there are only a few of these cores running Linux out in the wild. This only works on UP systems. Reviewed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>	2016-10-24 09:24:26 -07:00
Vineet Gupta	be64c997d9	ARC: remove extraneous __KERNEL__ guards ... Verified by doing make headers_install as none of these files are exported to userspace	2014-10-13 14:46:20 +05:30
Vineet Gupta	180d406e49	ARC: ABIv3: fork/vfork wrappers not needed in "no-legacy-syscall" ABI ... When switching to clone() only ABI - I missed out pruning the low level asm syscall wrappers Signed-off-by: Vineet Gupta <vgupta@synopsys.com>	2013-03-11 19:01:10 +05:30
Vineet Gupta	4adeefe161	ARC: Syscall support (no-legacy-syscall ABI) ... This includes support for generic clone/for/vfork/execve Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Arnd Bergmann <arnd@arndb.de>	2013-02-11 20:00:38 +05:30