linux-kernel - Re: [PATCH v2] Fix display of Maximum Memory

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Date:   Wed, 15 Jan 2020 16:07:49 -0800
From:   Tyrel Datwyler <tyreld@...ux.ibm.com>
To:     Michael Bringmann <mwb@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Gustavo Walbon <gwalbon@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH v2] Fix display of Maximum Memory

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@...ux.ibm.com>

> Signed-off-by: Michael Bringmann <mwb@...ux.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)
>