From 774846defceb16dcab2f0215cfc467f7c93f1c26 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 1 Feb 2016 22:06:59 +0000 Subject: [PATCH] efi/runtime-wrappers: Remove out of date comment regarding in_nmi() This code is long gone, so remove the comment as well. Signed-off-by: Ard Biesheuvel Signed-off-by: Matt Fleming Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1454364428-494-6-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar --- drivers/firmware/efi/runtime-wrappers.c | 26 ------------------------- 1 file changed, 26 deletions(-) diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c index e9f2867f0d91..311f415bff51 100644 --- a/drivers/firmware/efi/runtime-wrappers.c +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -61,32 +61,6 @@ */ static DEFINE_SPINLOCK(efi_runtime_lock); -/* - * Some runtime services calls can be reentrant under NMI, even if the table - * above says they are not. (source: UEFI Specification v2.4A) - * - * Table 32. Functions that may be called after Machine Check, INIT and NMI - * +----------------------------+------------------------------------------+ - * | Function | Called after Machine Check, INIT and NMI | - * +----------------------------+------------------------------------------+ - * | GetTime() | Yes, even if previously busy. | - * | GetVariable() | Yes, even if previously busy | - * | GetNextVariableName() | Yes, even if previously busy | - * | QueryVariableInfo() | Yes, even if previously busy | - * | SetVariable() | Yes, even if previously busy | - * | UpdateCapsule() | Yes, even if previously busy | - * | QueryCapsuleCapabilities() | Yes, even if previously busy | - * | ResetSystem() | Yes, even if previously busy | - * +----------------------------+------------------------------------------+ - * - * In order to prevent deadlocks under NMI, the wrappers for these functions - * may only grab the efi_runtime_lock or rtc_lock spinlocks if !efi_in_nmi(). - * However, not all of the services listed are reachable through NMI code paths, - * so the the special handling as suggested by the UEFI spec is only implemented - * for QueryVariableInfo() and SetVariable(), as these can be reached in NMI - * context through efi_pstore_write(). - */ - /* * As per commit ef68c8f87ed1 ("x86: Serialize EFI time accesses on rtc_lock"), * the EFI specification requires that callers of the time related runtime