Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v2] Fix display of Maximum Memory
To:     Michael Bringmann <mwb@linux.ibm.com>,
        linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        Michael Ellerman <mpe@ellerman.id.au>,
        Gustavo Walbon <gwalbon@linux.ibm.com>,
        Paul Mackerras <paulus@samba.org>
References: <5577aef8-1d5a-ca95-ff0a-9c7b5977e5bf@linux.ibm.com>
From:   Tyrel Datwyler <tyreld@linux.ibm.com>
Message-ID: <7f8f6e88-8187-d690-13cb-dae0e47c313b@linux.ibm.com>
Date:   Wed, 15 Jan 2020 16:07:49 -0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.3.0
MIME-Version: 1.0
In-Reply-To: <5577aef8-1d5a-ca95-ff0a-9c7b5977e5bf@linux.ibm.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 1/15/20 6:53 AM, Michael Bringmann wrote:
> Correct overflow problem in calculation+display of Maximum Memory
> value to syscfg where 32bits is insufficient.
> 

Probably needs the following Fixes tag:

Fixes: 772b039fd9a7 ("powerpc/pseries: Export maximum memory value")

otherwise,

Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>

> Signed-off-by: Michael Bringmann <mwb@linux.ibm.com>
> ---
>  arch/powerpc/platforms/pseries/lparcfg.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c
> index e33e8bc..f00411c 100644
> --- a/arch/powerpc/platforms/pseries/lparcfg.c
> +++ b/arch/powerpc/platforms/pseries/lparcfg.c
> @@ -433,12 +433,12 @@ static void parse_em_data(struct seq_file *m)
> 
>  static void maxmem_data(struct seq_file *m)
>  {
> -	unsigned long maxmem = 0;
> +	u64 maxmem = 0;
> 
> -	maxmem += drmem_info->n_lmbs * drmem_info->lmb_size;
> -	maxmem += hugetlb_total_pages() * PAGE_SIZE;
> +	maxmem += (u64)drmem_info->n_lmbs * drmem_info->lmb_size;
> +	maxmem += (u64)hugetlb_total_pages() * PAGE_SIZE;
> 
> -	seq_printf(m, "MaxMem=%ld\n", maxmem);
> +	seq_printf(m, "MaxMem=%llu\n", maxmem);
>  }
> 
>  static int pseries_lparcfg_data(struct seq_file *m, void *v)
>