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Wed, 05 Aug 2020 02:00:30 -0400 X-MC-Unique: i88hwEKrNImuiQFvk1P0-w-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8D7338064AC; Wed, 5 Aug 2020 06:00:13 +0000 (UTC) Received: from localhost (ovpn-12-71.pek2.redhat.com [10.72.12.71]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E5810726A3; Wed, 5 Aug 2020 06:00:08 +0000 (UTC) Date: Wed, 5 Aug 2020 14:00:06 +0800 From: Baoquan He To: Mike Rapoport Subject: Re: [PATCH v2 14/17] x86/setup: simplify reserve_crashkernel() Message-ID: <20200805060006.GU10792@MiWiFi-R3L-srv> References: <20200802163601.8189-1-rppt@kernel.org> <20200802163601.8189-15-rppt@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200802163601.8189-15-rppt@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Cc: Emil Renner Berthing , linux-sh@vger.kernel.org, Peter Zijlstra , Benjamin Herrenschmidt , Dave Hansen , linux-mips@vger.kernel.org, Max Filippov , Paul Mackerras , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, Will Deacon , Stafford Horne , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Yoshinori Sato , Michael Ellerman , x86@kernel.org, Russell King , Mike Rapoport , clang-built-linux@googlegroups.com, Ingo Molnar , linux-arm-kernel@lists.infradead.org, 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 , Hari Bathini , Michal Simek , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Palmer Dabbelt , Andrew Morton , Christoph Hellwig X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 08/02/20 at 07:35pm, Mike Rapoport wrote: > From: Mike Rapoport > > * Replace magic numbers with defines > * Replace memblock_find_in_range() + memblock_reserve() with > memblock_phys_alloc_range() > * Stop checking for low memory size in reserve_crashkernel_low(). The > allocation from limited range will anyway fail if there is no enough > memory, so there is no need for extra traversal of memblock.memory > > Signed-off-by: Mike Rapoport > --- > arch/x86/kernel/setup.c | 40 ++++++++++++++-------------------------- > 1 file changed, 14 insertions(+), 26 deletions(-) Applied this patch on top of 5.8, crashkernel reservation works well. And the code change looks good. Reviewed-by: Baoquan He > > diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c > index d8de4053c5e8..d7ced6982524 100644 > --- a/arch/x86/kernel/setup.c > +++ b/arch/x86/kernel/setup.c > @@ -419,13 +419,13 @@ static int __init reserve_crashkernel_low(void) > { > #ifdef CONFIG_X86_64 > unsigned long long base, low_base = 0, low_size = 0; > - unsigned long total_low_mem; > + unsigned long low_mem_limit; > int ret; > > - total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT)); > + low_mem_limit = min(memblock_phys_mem_size(), CRASH_ADDR_LOW_MAX); > > /* crashkernel=Y,low */ > - ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base); > + ret = parse_crashkernel_low(boot_command_line, low_mem_limit, &low_size, &base); > if (ret) { > /* > * two parts from kernel/dma/swiotlb.c: > @@ -443,23 +443,17 @@ static int __init reserve_crashkernel_low(void) > return 0; > } > > - low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN); > + low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX); > if (!low_base) { > pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n", > (unsigned long)(low_size >> 20)); > return -ENOMEM; > } > > - ret = memblock_reserve(low_base, low_size); > - if (ret) { > - pr_err("%s: Error reserving crashkernel low memblock.\n", __func__); > - return ret; > - } > - > - pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n", > + pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (low RAM limit: %ldMB)\n", > (unsigned long)(low_size >> 20), > (unsigned long)(low_base >> 20), > - (unsigned long)(total_low_mem >> 20)); > + (unsigned long)(low_mem_limit >> 20)); > > crashk_low_res.start = low_base; > crashk_low_res.end = low_base + low_size - 1; > @@ -503,13 +497,13 @@ static void __init reserve_crashkernel(void) > * unless "crashkernel=size[KMG],high" is specified. > */ > if (!high) > - crash_base = memblock_find_in_range(CRASH_ALIGN, > - CRASH_ADDR_LOW_MAX, > - crash_size, CRASH_ALIGN); > + crash_base = memblock_phys_alloc_range(crash_size, > + CRASH_ALIGN, CRASH_ALIGN, > + CRASH_ADDR_LOW_MAX); > if (!crash_base) > - crash_base = memblock_find_in_range(CRASH_ALIGN, > - CRASH_ADDR_HIGH_MAX, > - crash_size, CRASH_ALIGN); > + crash_base = memblock_phys_alloc_range(crash_size, > + CRASH_ALIGN, CRASH_ALIGN, > + CRASH_ADDR_HIGH_MAX); > if (!crash_base) { > pr_info("crashkernel reservation failed - No suitable area found.\n"); > return; > @@ -517,19 +511,13 @@ static void __init reserve_crashkernel(void) > } else { > unsigned long long start; > > - start = memblock_find_in_range(crash_base, > - crash_base + crash_size, > - crash_size, 1 << 20); > + start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base, > + crash_base + crash_size); > if (start != crash_base) { > pr_info("crashkernel reservation failed - memory is in use.\n"); > return; > } > } > - ret = memblock_reserve(crash_base, crash_size); > - if (ret) { > - pr_err("%s: Error reserving crashkernel memblock.\n", __func__); > - return; > - } > > if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) { > memblock_free(crash_base, crash_size); > -- > 2.26.2 > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu