linux-kernel - [PATCH 18/20] x86: ioremap: add early_memremap_pgprot

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Message-Id: <20230516193549.544673-19-arnd@kernel.org>
Date:   Tue, 16 May 2023 21:35:47 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     x86@...nel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Juergen Gross <jgross@...e.com>,
        "Srivatsa S. Bhat (VMware)" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-pci@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-pm@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 18/20] x86: ioremap: add early_memremap_pgprot_adjust prototype

From: Arnd Bergmann <arnd@...db.de>

early_memremap_pgprot_adjust() is a __weak function with a local
prototype, but x86 has a custom implementation that does not
see the prototype, causing a W=1 warning:

arch/x86/mm/ioremap.c:785:17: error: no previous prototype for 'early_memremap_pgprot_adjust' [-Werror=missing-prototypes]

Move the declaration into the global linux/io.h header to avoid this.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/io.h | 5 +++++
 mm/internal.h      | 6 ------
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/include/linux/io.h b/include/linux/io.h
index 308f4f0cfb93..7304f2a69960 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -68,6 +68,11 @@ void *devm_memremap(struct device *dev, resource_size_t offset,
 		size_t size, unsigned long flags);
 void devm_memunmap(struct device *dev, void *addr);
 
+/* architectures can override this */
+pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
+					unsigned long size, pgprot_t prot);
+
+
 #ifdef CONFIG_PCI
 /*
  * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
diff --git a/mm/internal.h b/mm/internal.h
index 68410c6d97ac..e6029d94bdb2 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -178,12 +178,6 @@ extern unsigned long highest_memmap_pfn;
  */
 #define MAX_RECLAIM_RETRIES 16
 
-/*
- * in mm/early_ioremap.c
- */
-pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
-					unsigned long size, pgprot_t prot);
-
 /*
  * in mm/vmscan.c:
  */
-- 
2.39.2