md/raid6: move raid6 data processing to raid6_pq.ko

Move the raid6 data processing routines into a standalone module
(raid6_pq) to prepare them to be called from async_tx wrappers and other
non-md drivers/modules.  This precludes a circular dependency of raid456
needing the async modules for data processing while those modules in
turn depend on raid456 for the base level synchronous raid6 routines.

To support this move:
1/ The exportable definitions in raid6.h move to include/linux/raid/pq.h
2/ The raid6_call, recovery calls, and table symbols are exported
3/ Extra #ifdef __KERNEL__ statements to enable the userspace raid6test to
   compile

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/md/mktables.c b/drivers/md/mktables.c
index b61d5767aae7..3b1500843bba 100644
--- a/drivers/md/mktables.c
+++ b/drivers/md/mktables.c
@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
         uint8_t v;
         uint8_t exptbl[256], invtbl[256];
 
-        printf("#include \"raid6.h\"\n");
+        printf("#include <linux/raid/pq.h>\n");
 
         /* Compute multiplication table */
         printf("\nconst u8  __attribute__((aligned(256)))\n"
@@ -76,6 +76,9 @@ int main(int argc, char *argv[])
                 printf("\t},\n");
         }
         printf("};\n");
+        printf("#ifdef __KERNEL__\n");
+        printf("EXPORT_SYMBOL(raid6_gfmul);\n");
+        printf("#endif\n");
 
         /* Compute power-of-2 table (exponent) */
         v = 1;
@@ -92,6 +95,9 @@ int main(int argc, char *argv[])
                 }
         }
         printf("};\n");
+        printf("#ifdef __KERNEL__\n");
+        printf("EXPORT_SYMBOL(raid6_gfexp);\n");
+        printf("#endif\n");
 
         /* Compute inverse table x^-1 == x^254 */
         printf("\nconst u8 __attribute__((aligned(256)))\n"
@@ -104,6 +110,9 @@ int main(int argc, char *argv[])
                 }
         }
         printf("};\n");
+        printf("#ifdef __KERNEL__\n");
+        printf("EXPORT_SYMBOL(raid6_gfinv);\n");
+        printf("#endif\n");
 
         /* Compute inv(2^x + 1) (exponent-xor-inverse) table */
         printf("\nconst u8 __attribute__((aligned(256)))\n"
@@ -115,6 +124,9 @@ int main(int argc, char *argv[])
                                (j == 7) ? '\n' : ' ');
         }
         printf("};\n");
+        printf("#ifdef __KERNEL__\n");
+        printf("EXPORT_SYMBOL(raid6_gfexi);\n");
+        printf("#endif\n");
 
         return 0;
 }