linux-kernel - Re: [PATCH v4 1/3] lib: add bitrev8x4()

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Date:   Thu, 1 Dec 2016 23:45:23 +0100
From:   Anatolij Gustschin <agust@...x.de>
To:     Joshua Clayton <stillcompiling@...il.com>
Cc:     Alan Tull <atull@...nsource.altera.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] lib: add bitrev8x4()

On Thu,  1 Dec 2016 09:04:50 -0800
Joshua Clayton stillcompiling@...il.com wrote:
...
>diff --git a/arch/arm/include/asm/bitrev.h b/arch/arm/include/asm/bitrev.h
>index ec291c3..6d2e9ca 100644
>--- a/arch/arm/include/asm/bitrev.h
>+++ b/arch/arm/include/asm/bitrev.h
>@@ -17,4 +17,9 @@ static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)
> 	return __arch_bitrev32((u32)x) >> 24;
> }
> 
>+static __always_inline __attribute_const__ u32 __arch_bitrev8x4(u32 x)
>+{
>+	__asm__ ("rbit %0, %1; rev %0, %0" : "=r" (x) : "r" (x));

	return x;
>+}

otherwise you get

In function '__arch_bitrev8x4':
warning: no return statement in function returning non-void [-Wreturn-type]

--
Anatolij