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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Mike Rapoport <rppt@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christoph Hellwig <hch@lst.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Max Filippov <jcmvbkbc@gmail.com>,
        Michal Simek <monstr@monstr.eu>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Mackerras <paulus@samba.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Russell King <linux@armlinux.org.uk>,
        Stafford Horne <shorne@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <will@kernel.org>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
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        uclinux-h8-devel@lists.sourceforge.jp, x86@kernel.org,
        Hari Bathini <hbathini@in.ibm.com>
Subject: Re: [PATCH 06/15] powerpc: fadamp: simplify fadump_reserve_crash_area()
In-Reply-To: <20200801101854.GD534153@kernel.org>
References: <20200728051153.1590-1-rppt@kernel.org> <20200728051153.1590-7-rppt@kernel.org> <87d04d5hda.fsf@mpe.ellerman.id.au> <20200801101854.GD534153@kernel.org>
Date:   Sun, 02 Aug 2020 23:14:10 +1000
Message-ID: <87o8nt197h.fsf@mpe.ellerman.id.au>
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Sender: linux-kernel-owner@vger.kernel.org
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Mike Rapoport <rppt@kernel.org> writes:
> On Thu, Jul 30, 2020 at 10:15:13PM +1000, Michael Ellerman wrote:
>> Mike Rapoport <rppt@kernel.org> writes:
>> > From: Mike Rapoport <rppt@linux.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@linux.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