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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6B1VhRQwgQQGh2ESABiP5pnpxVqXMTnf0pfde8jgU5c=; b=TKJiFPjVr2lsZ+Iu6sYa51serYlNyERHIQwgztYJylJUbFSghtjQnN4yADX1/B2hmp bYxCbJHwoBFEzBBzosTSWxnEjY8TW4DsBuM/hkOxqOeVoq71Qq1cKChThMWwCjlGmPwp mx2ibysVWOCh8WJO1ihy2U6g4OIjtStsVnoE68ySAz8IV+q5XjSYzYbFTnfSJbbWSH7K R4fCoIQXmejvmSSb74FdB0yvLGntiYYcsYPx0E51qSq2qkAJp1AkgOA2XcDVUobWtWbi b4MaXlNBTGVpw+KGfx2KlhxxY0GFqbpWwQJ5vUS+F8Pqxgoge4wKBOCQpkpK33+WH1kh nlDw== X-Gm-Message-State: APjAAAUOZqyeVtOxaU7SEry8jgq6/kqT0NkkBvwBK170tUCspomnAOzB EBkkimchJ9uGkA1DbyqnEWKsH0e5yovDNQUABD4= X-Google-Smtp-Source: APXvYqyPNyObzxGCszpMTR3wCIqeot/ONserksfYMvP/rvSOUlflaIV+vQ7wclyDj7cajseQxqH94Z+A90dnUyOQZjc= X-Received: by 2002:a63:c748:: with SMTP id v8mr19346399pgg.143.1580261280721; Tue, 28 Jan 2020 17:28:00 -0800 (PST) MIME-Version: 1.0 References: <1580189061-14091-1-git-send-email-yash.shah@sifive.com> In-Reply-To: From: JaeJoon Jung Date: Wed, 29 Jan 2020 10:27:49 +0900 Message-ID: Subject: Re: [PATCH] gpio/sifive: fix static checker warning To: Marc Zyngier Content-Type: multipart/mixed; boundary="0000000000004a46f3059d3d40cb" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200128_172802_019724_C62821E5 X-CRM114-Status: GOOD ( 20.71 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bgolaszewski@baylibre.com, wesley@sifive.com, linus.walleij@linaro.org, linux-kernel@vger.kernel.org, atish.patra@wdc.com, Yash Shah , Palmer Dabbelt , sachin.ghadi@sifive.com, linux-gpio@vger.kernel.org, Paul Walmsley , linux-riscv Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org --0000000000004a46f3059d3d40cb Content-Type: text/plain; charset="UTF-8" Because SiFive FU540 GPIO Registers are aligned 32-bit, I think that irq_state is good "unsigned int" than "unsigned long". I refer to SiFive FU540-C000 Manual v1p0 (GPIO Register Table 103) as "Only naturally aligned 32-bit memory accesses are supported" when you use assign_bit(offset, &chip->irq_state, 1), offset is 32-bit. I prefer to use bit operation instead of assign_bit(). u32 bit = BIT(offset); chip->irq_state |= bit; If you use this code, you do not use the assign_bit() and need not change irq_state data type. There are many improvements in my works for drivers/gpio/gpio-sifive.c. I hope to check my attached source file. On Tue, 28 Jan 2020 at 22:21, Marc Zyngier wrote: > > On 2020-01-28 05:24, Yash Shah wrote: > > Typcasting "irq_state" leads to the below static checker warning: > > The fix is to declare "irq_state" as unsigned long instead of u32. > > > > drivers/gpio/gpio-sifive.c:97 sifive_gpio_irq_enable() > > warn: passing casted pointer '&chip->irq_state' to > > 'assign_bit()' 32 vs 64. > > > > Fixes: 96868dce644d ("gpio/sifive: Add GPIO driver for SiFive SoCs") > > Reported-by: Dan Carpenter > > Signed-off-by: Yash Shah > > --- > > drivers/gpio/gpio-sifive.c | 6 +++--- > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c > > index 147a1bd..c54dd08 100644 > > --- a/drivers/gpio/gpio-sifive.c > > +++ b/drivers/gpio/gpio-sifive.c > > @@ -35,7 +35,7 @@ struct sifive_gpio { > > void __iomem *base; > > struct gpio_chip gc; > > struct regmap *regs; > > - u32 irq_state; > > + unsigned long irq_state; > > unsigned int trigger[SIFIVE_GPIO_MAX]; > > unsigned int irq_parent[SIFIVE_GPIO_MAX]; > > }; > > @@ -94,7 +94,7 @@ static void sifive_gpio_irq_enable(struct irq_data > > *d) > > spin_unlock_irqrestore(&gc->bgpio_lock, flags); > > > > /* Enable interrupts */ > > - assign_bit(offset, (unsigned long *)&chip->irq_state, 1); > > + assign_bit(offset, &chip->irq_state, 1); > > sifive_gpio_set_ie(chip, offset); > > } > > > > @@ -104,7 +104,7 @@ static void sifive_gpio_irq_disable(struct irq_data > > *d) > > struct sifive_gpio *chip = gpiochip_get_data(gc); > > int offset = irqd_to_hwirq(d) % SIFIVE_GPIO_MAX; > > > > - assign_bit(offset, (unsigned long *)&chip->irq_state, 0); > > + assign_bit(offset, &chip->irq_state, 0); > > sifive_gpio_set_ie(chip, offset); > > irq_chip_disable_parent(d); > > } > > Yup, nice one. Should have spotted it. > > Reviewed-by: Marc Zyngier > > Linus, do you want me to queue this via the irqchip tree (given that > it is where the original bug came from)? Or would you rather take it? > > M. > -- > Jazz is not dead. 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