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 for <linuxppc-dev@lists.ozlabs.org> from <aneesh.kumar@linux.vnet.ibm.com>;
 Mon, 19 Dec 2016 01:58:51 -0700
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Reza Arbab <arbab@linux.vnet.ibm.com>,
 Michael Ellerman <mpe@ellerman.id.au>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org, Balbir Singh <bsingharora@gmail.com>,
 Alistair Popple <apopple@au1.ibm.com>
Subject: Re: [PATCH v3 1/5] powerpc/mm: set the radix linear page mapping size
In-Reply-To: <1481831443-22761-2-git-send-email-arbab@linux.vnet.ibm.com>
References: <1481831443-22761-1-git-send-email-arbab@linux.vnet.ibm.com>
 <1481831443-22761-2-git-send-email-arbab@linux.vnet.ibm.com>
Date: Mon, 19 Dec 2016 14:28:42 +0530
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Reza Arbab <arbab@linux.vnet.ibm.com> writes:

> This was defaulting to 4K, regardless of PAGE_SIZE.
>
> Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com>
> ---
>  arch/powerpc/mm/pgtable-radix.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
> index 623a0dc..54bd70e 100644
> --- a/arch/powerpc/mm/pgtable-radix.c
> +++ b/arch/powerpc/mm/pgtable-radix.c
> @@ -351,8 +351,10 @@ void __init radix__early_init_mmu(void)
>  #ifdef CONFIG_PPC_64K_PAGES
>  	/* PAGE_SIZE mappings */
>  	mmu_virtual_psize = MMU_PAGE_64K;
> +	mmu_linear_psize = MMU_PAGE_64K;

That is not clearly correct, we map the linear address with either 64K,
2M or 1G depending on the memory available. Take a look at
static void __init radix_init_pgtable(void)


>  #else
>  	mmu_virtual_psize = MMU_PAGE_4K;
> +	mmu_linear_psize = MMU_PAGE_4K;
>  #endif
>
>  #ifdef CONFIG_SPARSEMEM_VMEMMAP
> -- 
> 1.8.3.1