Ian Campbell 85323a991d xen: arm: mandate EABI and use generic atomic operations. ... Rob Herring has observed that c81611c4e9 "xen: event channel arrays are xen_ulong_t and not unsigned long" introduced a compile failure when building without CONFIG_AEABI: /tmp/ccJaIZOW.s: Assembler messages: /tmp/ccJaIZOW.s:831: Error: even register required -- `ldrexd r5,r6,[r4]' Will Deacon pointed out that this is because OABI does not require even base registers for 64-bit values. We can avoid this by simply using the existing atomic64_xchg operation and the same containerof trick as used by the cmpxchg macros. However since this code is used on memory which is shared with the hypervisor we require proper atomic instructions and cannot use the generic atomic64 callbacks (which are based on spinlocks), therefore add a dependency on !GENERIC_ATOMIC64. Since we already depend on !CPU_V6 there isn't much downside to this. While thinking about this we also observed that OABI has different struct alignment requirements to EABI, which is a problem for hypercall argument structs which are shared with the hypervisor and which must be in EABI layout. Since I don't expect people to want to run OABI kernels on Xen depend on CONFIG_AEABI explicitly too (although it also happens to be enforced by the !GENERIC_ATOMIC64 requirement too). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Rob Herring <robherring2@gmail.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		2013-03-11 13:52:19 -04:00
..
events.h	xen: arm: mandate EABI and use generic atomic operations.	2013-03-11 13:52:19 -04:00
hypercall.h	xen/arm: compile netback	2012-08-08 17:21:23 +00:00
hypervisor.h
interface.h	xen: arm: implement remap interfaces needed for privcmd mappings.	2012-11-29 14:00:19 +00:00
page.h	xen: introduce xen_remap, use it instead of ioremap	2013-02-19 22:02:34 -05:00