linux-kernel - Re: [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP

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Message-Id: <d181b762-3e7b-7a0a-2505-54ead241456d@linux.ibm.com>
Date:   Thu, 17 Oct 2019 18:36:26 +1100
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com,
        dja@...ens.net
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK

On 10/9/19 7:16 pm, Christophe Leroy wrote:
> +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
> +#define THREAD_SHIFT		PAGE_SHIFT
> +#else
>   #define THREAD_SHIFT		CONFIG_THREAD_SHIFT
> +#endif
> 
>   #define THREAD_SIZE		(1 << THREAD_SHIFT)
> 

Looking at 64-bit book3s: with 64K pages, this results in a THREAD_SIZE 
that's too large for immediate mode arithmetic operations, which is 
annoying. Hmm.

-- 
Andrew Donnellan              OzLabs, ADL Canberra
ajd@...ux.ibm.com             IBM Australia Limited