[PATCH] x86: Adds mtrr_save_fixed_ranges() for use in two later patches.

In this current implementation which is used in other patches,
mtrr_save_fixed_ranges() accepts a dummy void pointer because
in the current implementation of one of these patches, this
function may be called from smp_call_function_single() which
requires that this function takes a void pointer argument.

This function calls get_fixed_ranges(), passing mtrr_state.fixed_ranges
which is the element of the static struct which stores our current
backup of the fixed-range MTRR values which all CPUs shall be
using.

Because  mtrr_save_fixed_ranges calls get_fixed_ranges after
kernel initialisation time, __init needs to be removed from
the declaration of get_fixed_ranges().

If CONFIG_MTRR is not set, we define mtrr_save_fixed_ranges
as an empty statement because there is nothing to do.

AK: Moved prototypes for x86-64 around to fix warnings

Signed-off-by: Bernhard Kaindl <bk@suse.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Dave Jones <davej@codemonkey.org.uk>

arch/i386/kernel/cpu/mtrr/generic.c

@@ -37,7 +37,7 @@ get_mtrr_var_range(unsigned int index, struct mtrr_var_range *vr)
 	rdmsr(MTRRphysMask_MSR(index), vr->mask_lo, vr->mask_hi);
 }
 
-static void __init
+static void
 get_fixed_ranges(mtrr_type * frs)
 {
 	unsigned int *p = (unsigned int *) frs;
@@ -51,6 +51,11 @@ get_fixed_ranges(mtrr_type * frs)
 		rdmsr(MTRRfix4K_C0000_MSR + i, p[6 + i * 2], p[7 + i * 2]);
 }
 
+void mtrr_save_fixed_ranges(void *info)
+{
+	get_fixed_ranges(mtrr_state.fixed_ranges);
+}
+
 static void __init print_fixed(unsigned base, unsigned step, const mtrr_type*types)
 {
 	unsigned i;

include/asm-i386/mtrr.h

@@ -69,6 +69,7 @@ struct mtrr_gentry
 
 /*  The following functions are for use by other drivers  */
 # ifdef CONFIG_MTRR
+extern void mtrr_save_fixed_ranges(void *);
 extern int mtrr_add (unsigned long base, unsigned long size,
 		     unsigned int type, char increment);
 extern int mtrr_add_page (unsigned long base, unsigned long size,
@@ -79,6 +80,7 @@ extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
 extern void mtrr_ap_init(void);
 extern void mtrr_bp_init(void);
 #  else
+#define mtrr_save_fixed_ranges(arg) do {} while (0)
 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
 				unsigned int type, char increment)
 {

include/asm-x86_64/mtrr.h

@@ -138,9 +138,11 @@ struct mtrr_gentry32
 #ifdef CONFIG_MTRR
 extern void mtrr_ap_init(void);
 extern void mtrr_bp_init(void);
+extern void mtrr_save_fixed_ranges(void *);
 #else
 #define mtrr_ap_init() do {} while (0)
 #define mtrr_bp_init() do {} while (0)
+#define mtrr_save_fixed_ranges(arg) do {} while (0)
 #endif
 
 #endif /* __KERNEL__ */