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From:   "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To:     Laurent Dufour <ldufour@linux.ibm.com>, mpe@ellerman.id.au,
        benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com
Cc:     linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] powerpc/mm: Initialize the HPTE encoding values
In-Reply-To: <20190830120712.22971-2-ldufour@linux.ibm.com>
References: <20190830120712.22971-1-ldufour@linux.ibm.com> <20190830120712.22971-2-ldufour@linux.ibm.com>
Date:   Thu, 12 Sep 2019 19:02:40 +0530
Message-ID: <87v9txzll3.fsf@linux.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Laurent Dufour <ldufour@linux.ibm.com> writes:

> Before reading the HPTE encoding values we initialize all of them to -1 (an
> invalid value) to later being able to detect the initialized ones.
>
> Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>

We already do this in mmu_psize_set_default_penc() ?

> ---
>  arch/powerpc/mm/book3s64/hash_utils.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
> index c3bfef08dcf8..2039bc315459 100644
> --- a/arch/powerpc/mm/book3s64/hash_utils.c
> +++ b/arch/powerpc/mm/book3s64/hash_utils.c
> @@ -408,7 +408,7 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
>  {
>  	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
>  	const __be32 *prop;
> -	int size = 0;
> +	int size = 0, idx, base_idx;
>  
>  	/* We are scanning "cpu" nodes only */
>  	if (type == NULL || strcmp(type, "cpu") != 0)
> @@ -418,6 +418,11 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
>  	if (!prop)
>  		return 0;
>  
> +	/* Set all the penc values to invalid */
> +	for (base_idx = 0; base_idx < MMU_PAGE_COUNT; base_idx++)
> +		for (idx = 0; idx < MMU_PAGE_COUNT; idx++)
> +			mmu_psize_defs[base_idx].penc[idx] = -1;
> +
>  	pr_info("Page sizes from device-tree:\n");
>  	size /= 4;
>  	cur_cpu_spec->mmu_features &= ~(MMU_FTR_16M_PAGE);
> @@ -426,7 +431,6 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
>  		unsigned int slbenc = be32_to_cpu(prop[1]);
>  		unsigned int lpnum = be32_to_cpu(prop[2]);
>  		struct mmu_psize_def *def;
> -		int idx, base_idx;
>  
>  		size -= 3; prop += 3;
>  		base_idx = get_idx_from_shift(base_shift);
> -- 
> 2.23.0