linux-kernel - Re: [PATCH 01/11] kexec_file: allow archs to handle special regions while locating memory hole

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Message-ID: <38237270-ce15-c8ec-a527-1ff938ca257d@linux.ibm.com>
Date:   Mon, 29 Jun 2020 11:30:35 +0530
From:   Hari Bathini <hbathini@...ux.ibm.com>
To:     piliu <piliu@...hat.com>, Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kexec-ml <kexec@...ts.infradead.org>,
        Petr Tesarik <ptesarik@...e.cz>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Sourabh Jain <sourabhjain@...ux.ibm.com>,
        lkml <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...abs.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH 01/11] kexec_file: allow archs to handle special regions
 while locating memory hole



On 28/06/20 7:58 am, piliu wrote:
> Hi Hari,
> 
> If in [4/11],  get_exclude_memory_ranges() turns out to be unnecessary
> ,then this patch is abundant either. As my understanding, memblock has
> already helped to achieved the purpose that get_exclude_memory_ranges()
> wants.

As mentioned in the other patch, there is a need for @exclude_ranges as crashkernel
region is likely to have an overlap with regions like opal, rtas..

But yeah.. the weak function should have been kexec_locate_mem_hole() instead
of kexec_add_buffer(). Will take care of that in v2.

> On 06/27/2020 03:04 AM, Hari Bathini wrote:
>> Some archs can have special memory regions, within the given memory
>> range, which can't be used for the buffer in a kexec segment. As
>> kexec_add_buffer() function is being called from generic code as well,
>> add weak arch_kexec_add_buffer definition for archs to override & take
>> care of special regions before trying to locate a memory hole.
>>
>> Signed-off-by: Hari Bathini <hbathini@...ux.ibm.com>

Thanks
Hari