linux-kernel - Re: [PATCH v2 4/6] ARM: change vmalloc_start to vmalloc

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Date:   Fri, 28 May 2021 21:15:27 +0800
From:   "Xu, Yanfei" <yanfei.xu@...driver.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     rppt@...nel.org, ardb@...nel.org, linus.walleij@...aro.org,
        akpm@...ux-foundation.org, carver4lio@....com,
        tiantao6@...ilicon.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] ARM: change vmalloc_start to vmalloc_size



On 5/28/21 6:11 PM, Russell King (Oracle) wrote:
> [Please note: This e-mail is from an EXTERNAL e-mail address]
> 
> Rather than storing the start of vmalloc space, store the size, and
> move the calculation into adjust_lowmem_limit(). We now have one single
> place where this calculation takes place.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Reviewed-by: Yanfei Xu <yanfei.xu@...driver.com>

Regards,
Yanfei
> ---
>   arch/arm/mm/mmu.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> index ed2846bdb1f4..5ae11e6f2a58 100644
> --- a/arch/arm/mm/mmu.c
> +++ b/arch/arm/mm/mmu.c
> @@ -1123,7 +1123,7 @@ void __init debug_ll_io_init(void)
>   }
>   #endif
> 
> -static unsigned long __initdata vmalloc_start = VMALLOC_END - (240 << 20);
> +static unsigned long __initdata vmalloc_size = 240 << 20;
> 
>   /*
>    * vmalloc=size forces the vmalloc area to be exactly 'size'
> @@ -1148,7 +1148,7 @@ static int __init early_vmalloc(char *arg)
>                          vmalloc_reserve >> 20);
>          }
> 
> -       vmalloc_start = VMALLOC_END - vmalloc_reserve;
> +       vmalloc_size = vmalloc_reserve;
>          return 0;
>   }
>   early_param("vmalloc", early_vmalloc);
> @@ -1168,7 +1168,7 @@ void __init adjust_lowmem_bounds(void)
>           * and may itself be outside the valid range for which phys_addr_t
>           * and therefore __pa() is defined.
>           */
> -       vmalloc_limit = (u64)vmalloc_start - VMALLOC_OFFSET -
> +       vmalloc_limit = (u64)VMALLOC_END - vmalloc_size - VMALLOC_OFFSET -
>                          PAGE_OFFSET + PHYS_OFFSET;
> 
>          /*
> --
> 2.20.1
>