linux-kernel - [PATCH 3/4] parisc: Use absolute_pointer for memcmp on fixed memory location

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Message-Id: <20210912160149.2227137-4-linux@roeck-us.net>
Date:   Sun, 12 Sep 2021 09:01:48 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-alpha@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
        netdev@...r.kernel.org, linux-sparse@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 3/4] parisc: Use absolute_pointer for memcmp on fixed memory location

parisc:allmodconfig fails to build with the following error
when using gcc 11.x.

arch/parisc/kernel/setup.c: In function 'start_parisc':
arch/parisc/kernel/setup.c:389:28: error:
	'__builtin_memcmp_eq' specified bound 8 exceeds source size 0

Avoid the problem by using absolute_pointer() when providing a memory
address to memcmp().

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/parisc/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
index cceb09855e03..4e13345b6581 100644
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -384,7 +384,7 @@ void __init start_parisc(void)
 	struct pdc_coproc_cfg coproc_cfg;
 
 	/* check QEMU/SeaBIOS marker in PAGE0 */
-	running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
+	running_on_qemu = (memcmp(absolute_pointer(&PAGE0->pad0), "SeaBIOS", 8) == 0);
 
 	cpunum = smp_processor_id();
 
-- 
2.33.0