From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Ellerman Date: Thu, 30 Jul 2020 12:15:13 +0000 Subject: Re: [PATCH 06/15] powerpc: fadamp: simplify fadump_reserve_crash_area() Message-Id: <87d04d5hda.fsf@mpe.ellerman.id.au> List-Id: References: <20200728051153.1590-1-rppt@kernel.org> <20200728051153.1590-7-rppt@kernel.org> In-Reply-To: <20200728051153.1590-7-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Mike Rapoport , Andrew Morton Cc: linux-sh@vger.kernel.org, Peter Zijlstra , Benjamin Herrenschmidt , Dave Hansen , Hari Bathini , linux-mips@vger.kernel.org, Max Filippov , Paul Mackerras , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, Will Deacon , Stafford Horne , Marek Szyprowski , linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Yoshinori Sato , x86@kernel.org, Russell King , Mike Rapoport , clang-built-linux@googlegroups.com, Ingo Molnar , Catalin Marinas , uclinux-h8-devel@lists.sourceforge.jp, linux-xtensa@linux-xtensa.org, openrisc@lists.librecores.org, Borislav Petkov , Andy Lutomirski , Paul Walmsley , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Michal Simek , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Palmer Dabbelt , Christoph Hellwig Mike Rapoport writes: > From: Mike Rapoport > > 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 > --- > 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 :) Acked-by: Michael Ellerman > diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c > index 78ab9a6ee6ac..2446a61e3c25 100644 > --- a/arch/powerpc/kernel/fadump.c > +++ b/arch/powerpc/kernel/fadump.c > @@ -1658,25 +1658,7 @@ int __init fadump_reserve_mem(void) > /* Preserve everything above the base address */ > static void __init fadump_reserve_crash_area(u64 base) > { > - struct memblock_region *reg; > - u64 mstart, msize; > - > - for_each_memblock(memory, reg) { > - mstart = reg->base; > - msize = reg->size; > - > - if ((mstart + msize) < base) > - continue; > - > - if (mstart < base) { > - msize -= (base - mstart); > - mstart = base; > - } > - > - pr_info("Reserving %lluMB of memory at %#016llx for preserving crash data", > - (msize >> 20), mstart); > - memblock_reserve(mstart, msize); > - } > + memblock_reserve(base, memblock_end_of_DRAM() - base); > } > > unsigned long __init arch_reserved_kernel_pages(void) > -- > 2.26.2