linux-kernel - [PATCH] lib/raid6: Replace custom zero page with ZERO

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Message-ID: <Z9U0_uj1E2MlYhGx@gondor.apana.org.au>
Date: Sat, 15 Mar 2025 16:06:22 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Song Liu <song@...nel.org>, Yu Kuai <yukuai3@...wei.com>,
	linux-raid@...r.kernel.org
Subject: [PATCH] lib/raid6: Replace custom zero page with ZERO_PAGE

Use the system-wide zero page instead of a custom zero page.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index 98030accf641..1460c15dea63 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -11,8 +11,9 @@
 #ifdef __KERNEL__
 
 #include <linux/blkdev.h>
+#include <linux/mm.h>
 
-extern const char raid6_empty_zero_page[PAGE_SIZE];
+#define raid6_empty_zero_page ((const char *)page_address(ZERO_PAGE(0)))
 
 #else /* ! __KERNEL__ */
 /* Used for testing in user space */
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index cd2e88ee1f14..03f1a8c179f7 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -18,9 +18,6 @@
 #else
 #include <linux/module.h>
 #include <linux/gfp.h>
-/* In .bss so it's zeroed */
-const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
-EXPORT_SYMBOL(raid6_empty_zero_page);
 #endif
 
 struct raid6_calls raid6_call;
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt