linux-kernel - Re: [PATCH 11/17] powerpc/nohash32: set GUARDED attribute in the PMD directly

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Message-ID: <87vabur8pr.fsf@concordia.ellerman.id.au>
Date:   Fri, 11 May 2018 16:45:52 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        aneesh.kumar@...ux.vnet.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH  11/17] powerpc/nohash32: set GUARDED attribute in the PMD directly

Christophe Leroy <christophe.leroy@....fr> writes:

> diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
> index 59be5dfcb3e9..b8c347077e02 100644
> --- a/arch/powerpc/mm/ioremap.c
> +++ b/arch/powerpc/mm/ioremap.c
> @@ -132,9 +132,14 @@ void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
>  	if (slab_is_available()) {
>  		struct vm_struct *area;
>  
> -		area = __get_vm_area_caller(size, VM_IOREMAP,
> -					    ioremap_bot, IOREMAP_END,
> -					    caller);
> +		if (flags & _PAGE_GUARDED)

On 64-bit configs:

  arch/powerpc/mm/ioremap.c:135:15: error: '_PAGE_GUARDED' undeclared (first use in this function)

cheers