linux-kernel - [PATCH 05/14] mm/early_ioremap: Add prototype for early_memremap_pgprot

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Message-Id: <20210520084809.8576-6-mgorman@techsingularity.net>
Date:   Thu, 20 May 2021 09:48:00 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Streetman <ddstreet@...e.org>,
        Yang Shi <shy828301@...il.com>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 05/14] mm/early_ioremap: Add prototype for early_memremap_pgprot_adjust

make W=1 generates the following warning for mm/early_ioremap.c

mm/early_ioremap.c:34:24: warning: no previous prototype for ‘early_memremap_pgprot_adjust’ [-Wmissing-prototypes]
 pgprot_t __init __weak early_memremap_pgprot_adjust(resource_size_t phys_addr,
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

The weak functions that can be overridden by architectures are
declared in include/asm-generic/early_ioremap.h so add the prototype
there. The asm/fixmap.h header is need for pgprot_t.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 include/asm-generic/early_ioremap.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h
index 9def22e6e2b3..022f8f908b42 100644
--- a/include/asm-generic/early_ioremap.h
+++ b/include/asm-generic/early_ioremap.h
@@ -3,6 +3,7 @@
 #define _ASM_EARLY_IOREMAP_H_
 
 #include <linux/types.h>
+#include <asm/fixmap.h>
 
 /*
  * early_ioremap() and early_iounmap() are for temporary early boot-time
@@ -19,6 +20,14 @@ extern void *early_memremap_prot(resource_size_t phys_addr,
 extern void early_iounmap(void __iomem *addr, unsigned long size);
 extern void early_memunmap(void *addr, unsigned long size);
 
+/*
+ * Weak function called by early_memremap and early_memremap_ro. It does
+ * nothing, but architectures may provide their own version to handle
+ * memory encryption.
+ */
+extern pgprot_t early_memremap_pgprot_adjust(resource_size_t phys_addr,
+					    unsigned long size, pgprot_t prot);
+
 /*
  * Weak function called by early_ioremap_reset(). It does nothing, but
  * architectures may provide their own version to do any needed cleanups.
-- 
2.26.2