linux-kernel - Re: [PATCH 06/15] powerpc: fadamp: simplify fadump_reserve_crash

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Message-ID: <87o8nt197h.fsf@mpe.ellerman.id.au>
Date:   Sun, 02 Aug 2020 23:14:10 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michal Simek <monstr@...str.eu>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        clang-built-linux@...glegroups.com,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.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, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org,
        Hari Bathini <hbathini@...ibm.com>
Subject: Re: [PATCH 06/15] powerpc: fadamp: simplify fadump_reserve_crash_area()

Mike Rapoport <rppt@...nel.org> writes:
> On Thu, Jul 30, 2020 at 10:15:13PM +1000, Michael Ellerman wrote:
>> Mike Rapoport <rppt@...nel.org> writes:
>> > From: Mike Rapoport <rppt@...ux.ibm.com>
>> >
>> > fadump_reserve_crash_area() reserves memory from a specified base address
>> > till the end of the RAM.
>> >
>> > Replace iteration through the memblock.memory with a single call to
>> > memblock_reserve() with appropriate  that will take care of proper memory
>>                                      ^
>>                                      parameters?
>> > reservation.
>> >
>> > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
>> > ---
>> >  arch/powerpc/kernel/fadump.c | 20 +-------------------
>> >  1 file changed, 1 insertion(+), 19 deletions(-)
>> 
>> I think this looks OK to me, but I don't have a setup to test it easily.
>> I've added Hari to Cc who might be able to.
>> 
>> But I'll give you an ack in the hope that it works :)
>
> Actually, I did some digging in the git log and the traversal was added
> there on purpose by the commit b71a693d3db3 ("powerpc/fadump: exclude
> memory holes while reserving memory in second kernel")
> Presuming this is still reqruired I'm going to drop this patch and will
> simply replace for_each_memblock() with for_each_mem_range() in v2.

Thanks.

cheers