linux-kernel - [PATCH 3.2 134/185] x86, efi: Don't use (U)EFI time services on 32 bit

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Message-ID: <lsq.1388282924.904743543@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:44 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Matt Fleming" <matt.fleming@...el.com>,
	"Matthew Garrett" <matthew.garrett@...ula.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 3.2 134/185] x86, efi: Don't use (U)EFI time services on
 32 bit

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Matthew Garrett <matthew.garrett@...ula.com>

commit 04bf9ba720fcc4fa313fa122b799ae0989b6cd50 upstream.

UEFI time services are often broken once we're in virtual mode. We were
already refusing to use them on 64-bit systems, but it turns out that
they're also broken on some 32-bit firmware, including the Dell Venue.
Disable them for now, we can revisit once we have the 1:1 mappings code
incorporated.

Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
Link: http://lkml.kernel.org/r/1385754283-2464-1-git-send-email-matthew.garrett@nebula.com
Cc: Matt Fleming <matt.fleming@...el.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
[bwh: Backported to 3.2: deleted code is slightly different]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/platform/efi/efi.c | 7 -------
 1 file changed, 7 deletions(-)

--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -614,11 +614,6 @@ void __init efi_init(void)
 
 	set_bit(EFI_MEMMAP, &x86_efi_facility);
 
-#ifdef CONFIG_X86_32
-	x86_platform.get_wallclock = efi_get_time;
-	x86_platform.set_wallclock = efi_set_rtc_mmss;
-#endif
-
 #if EFI_DEBUG
 	print_efi_memmap();
 #endif

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