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From:   Arnd Bergmann <arnd@kernel.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>
Cc:     Arnd Bergmann <arnd@arndb.de>, linux-kernel@vger.kernel.org,
        clang-built-linux@googlegroups.com
Subject: [PATCH] irqchip/gic-v3: fix OF_BAD_ADDR error handling
Date:   Tue, 23 Mar 2021 14:18:35 +0100
Message-Id: <20210323131842.2773094-1-arnd@kernel.org>
MIME-Version: 1.0
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From: Arnd Bergmann <arnd@arndb.de>

When building with extra warnings enabled, clang points out a
mistake in the error handling:

drivers/irqchip/irq-gic-v3-mbi.c:306:21: error: result of comparison of constant 18446744073709551615 with expression of type 'phys_addr_t' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
                if (mbi_phys_base == OF_BAD_ADDR) {

Truncate the constant to the same type as the variable it gets compared
to, to shut make the check work and void the warning.

Fixes: 505287525c24 ("irqchip/gic-v3: Add support for Message Based Interrupts as an MSI controller")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/irqchip/irq-gic-v3-mbi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-mbi.c b/drivers/irqchip/irq-gic-v3-mbi.c
index 563a9b366294..e81e89a81cb5 100644
--- a/drivers/irqchip/irq-gic-v3-mbi.c
+++ b/drivers/irqchip/irq-gic-v3-mbi.c
@@ -303,7 +303,7 @@ int __init mbi_init(struct fwnode_handle *fwnode, struct irq_domain *parent)
 	reg = of_get_property(np, "mbi-alias", NULL);
 	if (reg) {
 		mbi_phys_base = of_translate_address(np, reg);
-		if (mbi_phys_base == OF_BAD_ADDR) {
+		if (mbi_phys_base == (phys_addr_t)OF_BAD_ADDR) {
 			ret = -ENXIO;
 			goto err_free_mbi;
 		}
-- 
2.29.2