[PATCH v3 1/2] raid6/test: fix the compilation error and warning

[Zhengyuan Liu <liuzhengyuan@xxxxxxxxxx>]

The compilation error is redeclaration showed as following:

	In file included from ../../../include/linux/limits.h:6,
	                 from /usr/include/x86_64-linux-gnu/bits/local_lim.h:38,
	                 from /usr/include/x86_64-linux-gnu/bits/posix1_lim.h:161,
	                 from /usr/include/limits.h:183,
	                 from /usr/lib/gcc/x86_64-linux-gnu/8/include-fixed/limits.h:194,
	                 from /usr/lib/gcc/x86_64-linux-gnu/8/include-fixed/syslimits.h:7,
	                 from /usr/lib/gcc/x86_64-linux-gnu/8/include-fixed/limits.h:34,
	                 from ../../../include/linux/raid/pq.h:30,
	                 from algos.c:14:
	../../../include/linux/types.h:114:15: error: conflicting types for ‘int64_t’
	 typedef s64   int64_t;
	               ^~~~~~~
	In file included from /usr/include/stdint.h:34,
	                 from /usr/lib/gcc/x86_64-linux-gnu/8/include/stdint.h:9,
	                 from /usr/include/inttypes.h:27,
	                 from ../../../include/linux/raid/pq.h:29,
	                 from algos.c:14:
	/usr/include/x86_64-linux-gnu/bits/stdint-intn.h:27:19: note: previous \
	declaration of ‘int64_t’ was here
	 typedef __int64_t int64_t;

The compilation warning is redefination showed as following:

	In file included from tables.c:2:
	../../../include/linux/export.h:180: warning: "EXPORT_SYMBOL" redefined
	 #define EXPORT_SYMBOL(sym)  __EXPORT_SYMBOL(sym, "")

	In file included from tables.c:1:
	../../../include/linux/raid/pq.h:61: note: this is the location of the previous definition
	 #define EXPORT_SYMBOL(sym)

Fixes: 54d50897d54 ("linux/kernel.h: split *_MAX and *_MIN macros into <linux/limits.h>")
Signed-off-by: Zhengyuan Liu <liuzhengyuan@xxxxxxxxxx>
---
 include/linux/raid/pq.h | 3 ++-
 lib/raid6/mktables.c    | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index 0832c9b66852..e0ddb47f4402 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -27,7 +27,6 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
 
 #include <errno.h>
 #include <inttypes.h>
-#include <limits.h>
 #include <stddef.h>
 #include <sys/mman.h>
 #include <sys/time.h>
@@ -59,7 +58,9 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
 #define enable_kernel_altivec()
 #define disable_kernel_altivec()
 
+#undef	EXPORT_SYMBOL
 #define EXPORT_SYMBOL(sym)
+#undef	EXPORT_SYMBOL_GPL
 #define EXPORT_SYMBOL_GPL(sym)
 #define MODULE_LICENSE(licence)
 #define MODULE_DESCRIPTION(desc)
diff --git a/lib/raid6/mktables.c b/lib/raid6/mktables.c
index 9c485df1308f..f02e10fa6238 100644
--- a/lib/raid6/mktables.c
+++ b/lib/raid6/mktables.c
@@ -56,8 +56,8 @@ int main(int argc, char *argv[])
 	uint8_t v;
 	uint8_t exptbl[256], invtbl[256];
 
-	printf("#include <linux/raid/pq.h>\n");
 	printf("#include <linux/export.h>\n");
+	printf("#include <linux/raid/pq.h>\n");
 
 	/* Compute multiplication table */
 	printf("\nconst u8  __attribute__((aligned(256)))\n"
-- 
2.20.1