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From: Arnd Bergmann <arnd@kernel.org>
To: Santosh Shilimkar <ssantosh@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>
Cc: soc@kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Russell King <linux@armlinux.org.uk>,
	Robin Murphy <robin.murphy@arm.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Jim Quinlan <james.quinlan@broadcom.com>,
	Maxime Ripard <maxime@cerno.tech>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com
Subject: [PATCH] ARM: keystone: fix integer overflow warning
Date: Tue, 23 Mar 2021 14:18:05 +0100
Message-ID: <20210323131814.2751750-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

clang warns about an impossible condition when building with 32-bit
phys_addr_t:

arch/arm/mach-keystone/keystone.c:79:16: error: result of comparison of constant 51539607551 with expression of type 'phys_addr_t' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
            mem_end   > KEYSTONE_HIGH_PHYS_END) {
            ~~~~~~~   ^ ~~~~~~~~~~~~~~~~~~~~~~
arch/arm/mach-keystone/keystone.c:78:16: error: result of comparison of constant 34359738368 with expression of type 'phys_addr_t' (aka 'unsigned int') is always true [-Werror,-Wtautological-constant-out-of-range-compare]
        if (mem_start < KEYSTONE_HIGH_PHYS_START ||
            ~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~

Change the temporary variable to a fixed-size u64 to avoid the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/mach-keystone/keystone.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index cd711bfc591f..2c647bdf8d25 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -65,7 +65,7 @@ static void __init keystone_init(void)
 static long long __init keystone_pv_fixup(void)
 {
 	long long offset;
-	phys_addr_t mem_start, mem_end;
+	u64 mem_start, mem_end;
 
 	mem_start = memblock_start_of_DRAM();
 	mem_end = memblock_end_of_DRAM();
@@ -78,7 +78,7 @@ static long long __init keystone_pv_fixup(void)
 	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
 	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
 		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
-		        (u64)mem_start, (u64)mem_end);
+		        mem_start, mem_end);
 		return 0;
 	}
 
-- 
2.29.2


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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 13:18 Arnd Bergmann [this message]
2021-03-23 17:56 ` Santosh Shilimkar
2021-03-23 18:24 ` Nathan Chancellor
2021-04-01 10:23 ` Arnd Bergmann

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