linux-kernel - [PATCH] x86, efi: Only print warning when desc

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Message-ID: <4DB74A50.3080804@kernel.org>
Date:	Tue, 26 Apr 2011 15:42:24 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Huang Ying <ying.huang@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, efi: Only print warning when desc_size is smaller than
 defined one.


One system get warning:
	Kernel-defined memdesc doesn't match the one from EFI!

UEFI spec allows GetMemoryMap() return bigger desc_size and desc_ver for future
extension.
And desc_size is already used to get offset of next memory entry.

Only need to check if desc_size is smaller than defined struct.

Also print the size in warning if it happens.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/platform/efi/efi.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6/arch/x86/platform/efi/efi.c
===================================================================
--- linux-2.6.orig/arch/x86/platform/efi/efi.c
+++ linux-2.6/arch/x86/platform/efi/efi.c
@@ -448,9 +448,10 @@ void __init efi_init(void)
 		printk(KERN_ERR "Could not map the EFI memory map!\n");
 	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 
-	if (memmap.desc_size != sizeof(efi_memory_desc_t))
+	if (memmap.desc_size < sizeof(efi_memory_desc_t))
 		printk(KERN_WARNING
-		  "Kernel-defined memdesc doesn't match the one from EFI!\n");
+		  "Kernel-defined memdesc size is bigger than the one from EFI! %ld > %ld\n",
+			 sizeof(efi_memory_desc_t), memmap.desc_size);
 
 	if (add_efi_memmap)
 		do_add_efi_memmap();
--
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