linux-kernel - [PATCH 5/7] ia64: asm/io.h: Expect immutable pointer in virt_to

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Message-ID: <168155746830.13678.8071954787135972276.stgit@skinsburskii.localdomain>
Date:   Sat, 15 Apr 2023 04:17:48 -0700
From:   Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Helge Deller <deller@....de>, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>,
        linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] ia64: asm/io.h: Expect immutable pointer in virt_to_phys
 prototype

From: Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>

These helper function - virt_to_phys - doesn't need the address pointer to
be mutable.

In the same time expecting it to be mutable leads to the following build
warning for constant pointers:

  warning: passing argument 1 of ‘virt_to_phys’ discards ‘const’ qualifier from pointer target type

Signed-off-by: Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>
CC: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: Helge Deller <deller@....de>
CC: Arnd Bergmann <arnd@...db.de>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>
CC: linux-ia64@...r.kernel.org
CC: linux-kernel@...r.kernel.org
---
 arch/ia64/include/asm/io.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 83a492c8d298..c56ad21ba1e9 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -74,7 +74,7 @@ extern unsigned int num_io_spaces;
  * Change virtual addresses to physical addresses and vv.
  */
 static inline unsigned long
-virt_to_phys (volatile void *address)
+virt_to_phys (const volatile void *address)
 {
 	return (unsigned long) address - PAGE_OFFSET;
 }