On Tue, 2015-24-11 at 11:26:08 UTC, Michael Ellerman wrote: > Most users of RTAS (Run-Time Abstraction Services) use rtas_call(), > which deals with locking as well as endian handling. > > However we have two users outside of rtas.c that can't use rtas_call() > because they have different locking requirements. > > The hotplug CPU code can't take the RTAS lock because the CPU would go > offline with the lock held and no other CPUs would be able to call RTAS > until the CPU came back online. > > The xmon code doesn't want to take the lock because it would risk dead > locking when we are trying to recover from a crash. > > Both sites required multiple patches when we added little endian > support, proving that programmers can't do endian right. > > Although that ship has sailed, we can still clean the code up by > providing an unlocked version of rtas_call() which avoids the need to > open code the logic elsewhere. > > Signed-off-by: Michael Ellerman <[email protected]>
Series applied to powerpc next. https://git.kernel.org/powerpc/c/209eb4e5cbaba53ab555f3e7b4 cheers _______________________________________________ Linuxppc-dev mailing list [email protected] https://lists.ozlabs.org/listinfo/linuxppc-dev
