On Tue, Jan 20, 2015 at 04:21:59PM +0000, Nathan Whitehorn wrote:
> Author: nwhitehorn
> Date: Tue Jan 20 16:21:59 2015
> New Revision: 277421
> URL: https://svnweb.freebsd.org/changeset/base/277421
> 
> Log:
>   There does not seem to be any reason to acquire GIANT here. Follow amd64
>   in removing it.
>   
>   MFC after:  1 month
> 
> Modified:
>   head/sys/powerpc/powerpc/mem.c
> 
> Modified: head/sys/powerpc/powerpc/mem.c
> ==============================================================================
> --- head/sys/powerpc/powerpc/mem.c    Tue Jan 20 15:45:09 2015        
> (r277420)
> +++ head/sys/powerpc/powerpc/mem.c    Tue Jan 20 16:21:59 2015        
> (r277421)
> @@ -100,8 +100,6 @@ memrw(struct cdev *dev, struct uio *uio,
>       cnt = 0;
>       error = 0;
>  
> -     GIANT_REQUIRED;
> -

This is not an acquisition, to be pedantic.  Really, it is cdevsw which
has D_NEEDGIANT flag which acquires Giant.  After architectures get
rid of GIANT_REQUIRED, flag can be removed.
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