linux-kernel - Re: [PATCH] memblock: make memblock_find_in

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20210730104643.GG22278@shell.armlinux.org.uk>
Date:   Fri, 30 Jul 2021 11:46:43 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Frank Rowand <frowand.list@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Len Brown <lenb@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Will Deacon <will@...nel.org>, devicetree@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-mm@...ck.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH] memblock: make memblock_find_in_range method private

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.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!