From mboxrd@z Thu Jan  1 00:00:00 1970
From: agust@denx.de (Anatolij Gustschin)
Date: Thu, 1 Dec 2016 23:45:23 +0100
Subject: [PATCH v4 1/3] lib: add bitrev8x4()
In-Reply-To: <bc92eb1507448731163ae67fc888668d327f9168.1480551148.git.stillcompiling@gmail.com>
References: <cover.1480551148.git.stillcompiling@gmail.com>
 <bc92eb1507448731163ae67fc888668d327f9168.1480551148.git.stillcompiling@gmail.com>
Message-ID: <20161201234523.3bed63dc@crub>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thu,  1 Dec 2016 09:04:50 -0800
Joshua Clayton stillcompiling at gmail.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