linux-kernel - [PATCH] x86: use brk allocation for DMI

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Date:	Fri, 27 Feb 2009 17:51:21 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH] x86: use brk allocation for DMI

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Use extend_brk() to allocate memory for DMI rather than having an
ad-hoc allocator.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/include/asm/dmi.h |   14 ++------------
 arch/x86/kernel/setup.c    |    6 ------
 2 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/dmi.h b/arch/x86/include/asm/dmi.h
index bc68212..aa32f7e 100644
--- a/arch/x86/include/asm/dmi.h
+++ b/arch/x86/include/asm/dmi.h
@@ -2,21 +2,11 @@
 #define _ASM_X86_DMI_H
 
 #include <asm/io.h>
+#include <asm/setup.h>
 
-#define DMI_MAX_DATA 2048
-
-extern int dmi_alloc_index;
-extern char dmi_alloc_data[DMI_MAX_DATA];
-
-/* This is so early that there is no good way to allocate dynamic memory.
-   Allocate data in an BSS array. */
 static inline void *dmi_alloc(unsigned len)
 {
-	int idx = dmi_alloc_index;
-	if ((dmi_alloc_index + len) > DMI_MAX_DATA)
-		return NULL;
-	dmi_alloc_index += len;
-	return dmi_alloc_data + idx;
+	return extend_brk(len, sizeof(int));
 }
 
 /* Use early IO mappings for DMI because it's initialized early */
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index ed02176..1d4fe19 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -215,12 +215,6 @@ unsigned long mmu_cr4_features = X86_CR4_PAE;
 int bootloader_type;
 
 /*
- * Early DMI memory
- */
-int dmi_alloc_index;
-char dmi_alloc_data[DMI_MAX_DATA];
-
-/*
  * Setup options
  */
 struct screen_info screen_info;
-- 
1.6.0.6

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