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From: Baoquan He <bhe@redhat.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: Emil Renner Berthing <kernel@esmil.dk>,
	linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-mips@vger.kernel.org, Max Filippov <jcmvbkbc@gmail.com>,
	Paul Mackerras <paulus@samba.org>,
	sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org,
	Will Deacon <will@kernel.org>, Stafford Horne <shorne@gmail.com>,
	linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
	linux-c6x-dev@linux-c6x.org,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Michael Ellerman <mpe@ellerman.id.au>,
	x86@kernel.org, Russell King <linux@armlinux.org.uk>,
	Mike Rapoport <rppt@linux.ibm.com>,
	clang-built-linux@googlegroups.com,
	Ingo Molnar <mingo@redhat.com>,
	linux-arm-kernel@lists.infradead.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	uclinux-h8-devel@lists.sourceforge.jp,
	linux-xtensa@linux-xtensa.org, openrisc@lists.librecores.org,
	Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Hari Bathini <hbathini@linux.ibm.com>,
	Michal Simek <monstr@monstr.eu>,
	linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2 14/17] x86/setup: simplify reserve_crashkernel()
Date: Wed, 5 Aug 2020 14:00:06 +0800
Message-ID: <20200805060006.GU10792@MiWiFi-R3L-srv> (raw)
In-Reply-To: <20200802163601.8189-15-rppt@kernel.org>

On 08/02/20 at 07:35pm, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> * 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 <rppt@linux.ibm.com>
> ---
>  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 <bhe@redhat.com>

> 
> 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
> 

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  parent reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-02 16:35 [PATCH v2 00/17] memblock: seasonal cleaning^w cleanup Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 01/17] KVM: PPC: Book3S HV: simplify kvm_cma_reserve() Mike Rapoport
2020-08-04 13:53   ` Daniel Axtens
2020-08-02 16:35 ` [PATCH v2 02/17] dma-contiguous: simplify cma_early_percent_memory() Mike Rapoport
2020-08-05  3:50   ` Baoquan He
2020-08-02 16:35 ` [PATCH v2 03/17] arm, xtensa: simplify initialization of high memory pages Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 04/17] arm64: numa: simplify dummy_numa_init() Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 05/17] h8300, nds32, openrisc: simplify detection of memory extents Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 06/17] riscv: drop unneeded node initialization Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 07/17] mircoblaze: drop unneeded NUMA and sparsemem initializations Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 08/17] memblock: make for_each_memblock_type() iterator private Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 09/17] memblock: make memblock_debug and related functionality private Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 10/17] memblock: reduce number of parameters in for_each_mem_range() Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 11/17] arch, mm: replace for_each_memblock() with for_each_mem_pfn_range() Mike Rapoport
2020-08-05  3:57   ` Baoquan He
2020-08-02 16:35 ` [PATCH v2 12/17] arch, drivers: replace for_each_membock() with for_each_mem_range() Mike Rapoport
2020-08-05 11:00   ` Thomas Bogendoerfer
2020-08-02 16:35 ` [PATCH v2 13/17] x86/setup: simplify initrd relocation and reservation Mike Rapoport
2020-08-02 18:01   ` Ingo Molnar
2020-08-05  4:20   ` Baoquan He
2020-08-05  5:59     ` Mike Rapoport
2020-08-02 16:35 ` [PATCH v2 14/17] x86/setup: simplify reserve_crashkernel() Mike Rapoport
2020-08-02 18:02   ` Ingo Molnar
2020-08-05  6:00   ` Baoquan He [this message]
2020-08-02 16:35 ` [PATCH v2 15/17] memblock: remove unused memblock_mem_size() Mike Rapoport
2020-08-05  8:29   ` Baoquan He
2020-08-02 16:36 ` [PATCH v2 16/17] memblock: implement for_each_reserved_mem_region() using __next_mem_region() Mike Rapoport
2020-08-05  9:11   ` Baoquan He
2020-08-05 17:11   ` Miguel Ojeda
2020-08-02 16:36 ` [PATCH v2 17/17] memblock: use separate iterators for memory and reserved regions Mike Rapoport
2020-08-02 18:03   ` Ingo Molnar
2020-08-05  9:29   ` Baoquan He
2020-08-05 10:58   ` Thomas Bogendoerfer
2020-08-05 17:10   ` Miguel Ojeda

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