x86: use brk allocation for DMI

Impact: use new interface instead of previous ad hoc implementation

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

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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 3ac2aa7..e894f36 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -216,12 +216,6 @@ 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;