md: deal with merge_bvec_fn in component devices better.

[safe/jmp/linux-2.6] / drivers / md / raid6algos.c

diff --git a/drivers/md/raid6algos.c b/drivers/md/raid6algos.c
index 9265761..bffc61b 100644 (file)
--- a/drivers/md/raid6algos.c
+++ b/drivers/md/raid6algos.c
@@ -5,7 +5,7 @@
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
- *   Bostom MA 02111-1307, USA; either version 2 of the License, or
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
  *   (at your option) any later version; incorporated herein by reference.
  *
  * ----------------------------------------------------------------------- */
@@ -16,32 +16,20 @@
  * Algorithm list and algorithm selection for RAID-6
  */
 
-#include "raid6.h"
+#include <linux/raid/pq.h>
 #ifndef __KERNEL__
 #include <sys/mman.h>
 #include <stdio.h>
+#else
+#if !RAID6_USE_EMPTY_ZERO_PAGE
+/* In .bss so it's zeroed */
+const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
+EXPORT_SYMBOL(raid6_empty_zero_page);
+#endif
 #endif
 
 struct raid6_calls raid6_call;
-
-/* Various routine sets */
-extern const struct raid6_calls raid6_intx1;
-extern const struct raid6_calls raid6_intx2;
-extern const struct raid6_calls raid6_intx4;
-extern const struct raid6_calls raid6_intx8;
-extern const struct raid6_calls raid6_intx16;
-extern const struct raid6_calls raid6_intx32;
-extern const struct raid6_calls raid6_mmxx1;
-extern const struct raid6_calls raid6_mmxx2;
-extern const struct raid6_calls raid6_sse1x1;
-extern const struct raid6_calls raid6_sse1x2;
-extern const struct raid6_calls raid6_sse2x1;
-extern const struct raid6_calls raid6_sse2x2;
-extern const struct raid6_calls raid6_sse2x4;
-extern const struct raid6_calls raid6_altivec1;
-extern const struct raid6_calls raid6_altivec2;
-extern const struct raid6_calls raid6_altivec4;
-extern const struct raid6_calls raid6_altivec8;
+EXPORT_SYMBOL_GPL(raid6_call);
 
 const struct raid6_calls * const raid6_algos[] = {
        &raid6_intx1,
@@ -52,7 +40,7 @@ const struct raid6_calls * const raid6_algos[] = {
        &raid6_intx16,
        &raid6_intx32,
 #endif
-#if defined(__i386__)
+#if defined(__i386__) && !defined(__arch_um__)
        &raid6_mmxx1,
        &raid6_mmxx2,
        &raid6_sse1x1,
@@ -60,7 +48,7 @@ const struct raid6_calls * const raid6_algos[] = {
        &raid6_sse2x1,
        &raid6_sse2x2,
 #endif
-#if defined(__x86_64__)
+#if defined(__x86_64__) && !defined(__arch_um__)
        &raid6_sse2x1,
        &raid6_sse2x2,
        &raid6_sse2x4,
@@ -79,6 +67,7 @@ const struct raid6_calls * const raid6_algos[] = {
 #else
 /* Need more time to be stable in userspace */
 #define RAID6_TIME_JIFFIES_LG2 9
+#define time_before(x, y) ((x) < (y))
 #endif
 
 /* Try to pick the best algorithm */
@@ -121,7 +110,8 @@ int __init raid6_select_algo(void)
                        j0 = jiffies;
                        while ( (j1 = jiffies) == j0 )
                                cpu_relax();
-                       while ( (jiffies-j1) < (1 << RAID6_TIME_JIFFIES_LG2) ) {
+                       while (time_before(jiffies,
+                                           j1 + (1<<RAID6_TIME_JIFFIES_LG2))) {
                                (*algo)->gen_syndrome(disks, PAGE_SIZE, dptrs);
                                perf++;
                        }
@@ -151,3 +141,13 @@ int __init raid6_select_algo(void)
 
        return best ? 0 : -EINVAL;
 }
+
+static void raid6_exit(void)
+{
+       do { } while (0);
+}
+
+subsys_initcall(raid6_select_algo);
+module_exit(raid6_exit);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RAID6 Q-syndrome calculations");