From: Russell King Date: Fri, 11 Sep 2015 07:34:52 +0000 (+0100) Subject: ARM: domains: add memory dependencies to get_domain/set_domain X-Git-Tag: omap-for-v4.3/fixes-rc5~138^2^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e8f580d1fcc18e290713984c379cb97131c015a;p=pandora-kernel.git ARM: domains: add memory dependencies to get_domain/set_domain We need to have memory dependencies on get_domain/set_domain to avoid the compiler over-optimising these inline assembly instructions. Loads/stores must not be reordered across a set_domain(), so introduce a compiler barrier for that assembly. The value of get_domain() must not be cached across a set_domain(), but we still want to allow the compiler to optimise it away. Introduce a dependency on current_thread_info()->cpu_domain to avoid this; the new memory clobber in set_domain() should therefore cause the compiler to re-load this. The other advantage of using this is we should have its address in the register set already, or very soon after at most call sites. Tested-by: Robert Jarzmik Signed-off-by: Russell King --- Reading git-diff-tree failed