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Date:   Fri, 30 Jul 2021 11:46:43 +0100
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Mike Rapoport <rppt@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andy Lutomirski <luto@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Frank Rowand <frowand.list@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Ingo Molnar <mingo@redhat.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Len Brown <lenb@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
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Subject: Re: [PATCH] memblock: make memblock_find_in_range method private
Message-ID: <20210730104643.GG22278@shell.armlinux.org.uk>
References: <20210730104039.7047-1-rppt@kernel.org>
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Sender: Russell King (Oracle) <linux@armlinux.org.uk>
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On Fri, Jul 30, 2021 at 01:40:39PM +0300, Mike Rapoport wrote:
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index f97eb2371672..1f8ef9fd5215 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -1012,31 +1012,25 @@ static void __init reserve_crashkernel(void)
>  		unsigned long long lowmem_max = __pa(high_memory - 1) + 1;
>  		if (crash_max > lowmem_max)
>  			crash_max = lowmem_max;
> -		crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max,
> -						    crash_size, CRASH_ALIGN);
> +
> +		crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
> +						       CRASH_ALIGN, crash_max);
>  		if (!crash_base) {
>  			pr_err("crashkernel reservation failed - No suitable area found.\n");
>  			return;
>  		}
>  	} else {
> +		unsigned long long crash_max = crash_base + crash_size;
>  		unsigned long long start;
>  
> -		start = memblock_find_in_range(crash_base,
> -					       crash_base + crash_size,
> -					       crash_size, SECTION_SIZE);
> +		start = memblock_phys_alloc_range(crash_size, SECTION_SIZE,
> +						  crash_base, crash_max);
>  		if (start != crash_base) {
> -			pr_err("crashkernel reservation failed - memory is in use.\n");
> +			pr_err("crashkernel reservation failed - No suitable area found.\n");

This change to the error message is incorrect. In this code block, we
are trying to get the exact specified memory block - it is not about
there being "no suitable area" - the requested memory block is not
available. So, the original message carries the exact correct meaning.

-- 
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