linux-kernel - [PATCH 31/31] Fix const sections for crc32 table

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Date:	Sat, 18 Aug 2012 10:30:22 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, James.Bottomley@...senPartnership.com,
	Joe Mario <jmario@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 31/31] Fix const sections for crc32 table

From: Joe Mario <jmario@...hat.com>

Fix the const sections for the code generated by crc32 table
There's no ro version of the cacheline aligned section, so we
cannot put in const data without a conflict Just don't make the
crc tables const for now.

[Some fixes and new description from AK]
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 lib/crc32.c          |    9 ++++++---
 lib/gen_crc32table.c |    6 +++---
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/crc32.c b/lib/crc32.c
index 61774b8..bb8c5ae 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -188,11 +188,13 @@ u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
 #else
 u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
 {
-	return crc32_le_generic(crc, p, len, crc32table_le, CRCPOLY_LE);
+	return crc32_le_generic(crc, p, len, 
+			(const u32 (*)[256])crc32table_le, CRCPOLY_LE);
 }
 u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
 {
-	return crc32_le_generic(crc, p, len, crc32ctable_le, CRC32C_POLY_LE);
+	return crc32_le_generic(crc, p, len, 
+			(const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE);
 }
 #endif
 EXPORT_SYMBOL(crc32_le);
@@ -253,7 +255,8 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
 #else
 u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
 {
-	return crc32_be_generic(crc, p, len, crc32table_be, CRCPOLY_BE);
+	return crc32_be_generic(crc, p, len, 
+			(const u32 (*)[256])crc32table_be, CRCPOLY_BE);
 }
 #endif
 EXPORT_SYMBOL(crc32_be);
diff --git a/lib/gen_crc32table.c b/lib/gen_crc32table.c
index 8f8d543..75fac57 100644
--- a/lib/gen_crc32table.c
+++ b/lib/gen_crc32table.c
@@ -109,7 +109,7 @@ int main(int argc, char** argv)
 
 	if (CRC_LE_BITS > 1) {
 		crc32init_le();
-		printf("static const u32 __cacheline_aligned "
+        	printf("static u32 __cacheline_aligned "
 		       "crc32table_le[%d][%d] = {",
 		       LE_TABLE_ROWS, LE_TABLE_SIZE);
 		output_table(crc32table_le, LE_TABLE_ROWS,
@@ -119,7 +119,7 @@ int main(int argc, char** argv)
 
 	if (CRC_BE_BITS > 1) {
 		crc32init_be();
-		printf("static const u32 __cacheline_aligned "
+        	printf("static u32 __cacheline_aligned "
 		       "crc32table_be[%d][%d] = {",
 		       BE_TABLE_ROWS, BE_TABLE_SIZE);
 		output_table(crc32table_be, LE_TABLE_ROWS,
@@ -128,7 +128,7 @@ int main(int argc, char** argv)
 	}
 	if (CRC_LE_BITS > 1) {
 		crc32cinit_le();
-		printf("static const u32 __cacheline_aligned "
+        	printf("static u32 __cacheline_aligned "
 		       "crc32ctable_le[%d][%d] = {",
 		       LE_TABLE_ROWS, LE_TABLE_SIZE);
 		output_table(crc32ctable_le, LE_TABLE_ROWS,
-- 
1.7.7.6

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