Ard Biesheuvel 161485e827 efi: Implement mandatory locking for UEFI Runtime Services ... According to section 7.1 of the UEFI spec, Runtime Services are not fully reentrant, and there are particular combinations of calls that need to be serialized. Use a spinlock to serialize all Runtime Services with respect to all others, even if this is more than strictly needed. We've managed to get away without requiring a runtime services lock until now because most of the interactions with EFI involve EFI variables, and those operations are already serialised with __efivars->lock. Some of the assumptions underlying the decision whether locks are needed or not (e.g., SetVariable() against ResetSystem()) may not apply universally to all [new] architectures that implement UEFI. Rather than try to reason our way out of this, let's just implement at least what the spec requires in terms of locking. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>		2014-10-03 18:40:57 +01:00
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asm	efi: Implement mandatory locking for UEFI Runtime Services	2014-10-03 18:40:57 +01:00
uapi/asm	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2014-08-16 09:25:34 -06:00