linux-kernel - Re: [PATCH v1 03/16] powerpc/32: move LOAD_MSR_KERNEL() into head

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Date:   Mon, 11 Feb 2019 11:21:44 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v1 03/16] powerpc/32: move LOAD_MSR_KERNEL() into
 head_32.h and use it

On Fri, 2019-02-08 at 12:52 +0000, Christophe Leroy wrote:
>  /*
> + * MSR_KERNEL is > 0x8000 on 4xx/Book-E since it include MSR_CE.
> + */
> +.macro __LOAD_MSR_KERNEL r, x
> +.if \x >= 0x8000
> +       lis \r, (\x)@h
> +       ori \r, \r, (\x)@l
> +.else
> +       li \r, (\x)
> +.endif
> +.endm
> +#define LOAD_MSR_KERNEL(r, x) __LOAD_MSR_KERNEL r, x
> +

You changed the limit from >= 0x10000 to >= 0x8000 without a
corresponding explanation as to why...

Ben.