From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-124.mta0.migadu.com [91.218.175.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E3E14B0E3B for ; Fri, 18 Sep 2026 08:48:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789721337; cv=none; b=BzyVadojl+AjlchV1Dl3Rkr/UgJZLR3nShhTTe5lk4TYL6oI9Q3skrRpKvECIgrczLRf7CwyuIbPkKx8HkH7LJTF35zTQ32KvoiUKyoraltTkdFD1ICuE2zL4Cki/Zr1JQYCgffkgrKnZhuM+RPks7y3hya5FIqNtSlzeVW5QtI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789721337; c=relaxed/simple; bh=BGRV/j7qC/zFRryyQ69/Qz6UrrritH2vK+O2tUc3+pA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AoQqksCgzY9w7KoDuGP1yhGPLzincl0VwcvT5ovdIlrCSU0T0hnxOJloC9+gcR9FTDjorvDPACR0iIQXCU6Dn7Vg4+83w//hNhowmVzZbnqyiCgOa/dOEVXUjlf48NXlv2KmVcmdNnkc8amTtc6LSIntpO+a2x4GtyqQbd079Y4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=N+eIauUv; arc=none smtp.client-ip=91.218.175.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="N+eIauUv" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=BGRV/j7qC/zFRryyQ69/Qz6UrrritH2vK+O2tUc3+pA=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789721328; v=1; x=1790326128; b=N+eIauUvk9q0yZwY04e7hswM20JaJhHMg1rsm5Pxz8h9GmWgeU/13NnFpzrfk/AH2+YXEgIk d3p51EiZ3CrKDfboFo/JBI9HuHIizs67n7gGPFEhJikQH8YQ8rYal/OzX4pV1O/sDf8J0JYoltL 0NwFltHidckM8QCMAq/h/144= X-Envelope-To: linux-kernel@vger.kernel.org Received: by mta10.migadu.com with ESMTPS id 308a52a5f758be34; Fri, 18 Sep 2026 08:48:48 +0000 X-Mizu-Trace-ID: 308a52a5f758be34 X-Migadu-Flow: FLOW_OUT Date: Fri, 18 Sep 2026 16:48:41 +0800 From: Baoquan He To: Wandun Cc: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, robh@kernel.org, saravanak@kernel.org, akpm@linux-foundation.org, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, m.szyprowski@samsung.com, mark.rutland@arm.com, kernel@xen0n.name, alex@ghiti.fr, hpa@zytor.com, ruirui.yang@linux.dev, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, iommu@lists.linux.dev Subject: Re: [PATCH v6 03/10] crash_core: fold duplicated memblock arch hooks into the weak default Message-ID: References: <20260902073116.802752-1-chenwandun1@gmail.com> <20260902073116.802752-4-chenwandun1@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On 09/18/26 at 04:45pm, Wandun wrote: > > > On 9/18/26 15:30, Baoquan He wrote: > > On 09/02/26 at 03:31pm, Wandun Chen wrote: > >> From: Wandun Chen > >> > >> arm64, loongarch and riscv open-code the same memblock walk in > >> arch_get_system_nr_ranges() and arch_crash_populate_cmem(). Move it into > >> the __weak defaults in kernel/crash_core.c and delete the arch copies. > >> > >> No functional change. > > > > In one version, you also tried to remove these functions on x86, I could > > remember it wrong. > > Yes, the x86 implementation can also remove these functions and use the same > approach as arm64, RISC-V, and LoongArch. However since this change would not > reduce the vmcore size on x86 at all, I did not include it in the current series. > > I plan to refactor this part on x86 after this series. OK, that's fine. I remember I saw the code, but couldn't find it in this patch. Thanks for telling. > > > > > > > Anyway, this looks good to me. > > > > Acked-by: Baoquan He > > > >> > >> Signed-off-by: Wandun Chen > >> Tested-by: Meijing Zhao > >> --- > >> arch/arm64/kernel/machine_kexec_file.c | 29 ---------------------- > >> arch/loongarch/kernel/machine_kexec_file.c | 27 -------------------- > >> arch/riscv/kernel/machine_kexec_file.c | 26 ------------------- > >> kernel/crash_core.c | 25 +++++++++++++++++-- > >> 4 files changed, 23 insertions(+), 84 deletions(-) > >> > >> diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c > >> index 854d872dfd0f..34d944d3f22f 100644 > >> --- a/arch/arm64/kernel/machine_kexec_file.c > >> +++ b/arch/arm64/kernel/machine_kexec_file.c > >> @@ -14,7 +14,6 @@ > >> #include > >> #include > >> #include > >> -#include > >> #include > >> #include > >> #include > >> @@ -39,34 +38,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image) > >> return kexec_image_post_load_cleanup_default(image); > >> } > >> > >> -#ifdef CONFIG_CRASH_DUMP > >> -unsigned int arch_get_system_nr_ranges(void) > >> -{ > >> - unsigned int nr_ranges = 2 + crashk_cma_cnt; /* for exclusion of crashkernel region */ > >> - phys_addr_t start, end; > >> - u64 i; > >> - > >> - for_each_mem_range(i, &start, &end) > >> - nr_ranges++; > >> - > >> - return nr_ranges; > >> -} > >> - > >> -int arch_crash_populate_cmem(struct crash_mem *cmem) > >> -{ > >> - phys_addr_t start, end; > >> - u64 i; > >> - > >> - for_each_mem_range(i, &start, &end) { > >> - cmem->ranges[cmem->nr_ranges].start = start; > >> - cmem->ranges[cmem->nr_ranges].end = end - 1; > >> - cmem->nr_ranges++; > >> - } > >> - > >> - return 0; > >> -} > >> -#endif > >> - > >> /* > >> * Tries to add the initrd and DTB to the image. If it is not possible to find > >> * valid locations, this function will undo changes to the image and return non > >> diff --git a/arch/loongarch/kernel/machine_kexec_file.c b/arch/loongarch/kernel/machine_kexec_file.c > >> index 5412aa9f3568..481b8f906a56 100644 > >> --- a/arch/loongarch/kernel/machine_kexec_file.c > >> +++ b/arch/loongarch/kernel/machine_kexec_file.c > >> @@ -13,7 +13,6 @@ > >> #include > >> #include > >> #include > >> -#include > >> #include > >> #include > >> #include > >> @@ -56,32 +55,6 @@ static void cmdline_add_initrd(struct kimage *image, unsigned long *cmdline_tmpl > >> } > >> > >> #ifdef CONFIG_CRASH_DUMP > >> -unsigned int arch_get_system_nr_ranges(void) > >> -{ > >> - int nr_ranges = 2; /* for exclusion of crashkernel region */ > >> - phys_addr_t start, end; > >> - uint64_t i; > >> - > >> - for_each_mem_range(i, &start, &end) > >> - nr_ranges++; > >> - > >> - return nr_ranges; > >> -} > >> - > >> -int arch_crash_populate_cmem(struct crash_mem *cmem) > >> -{ > >> - phys_addr_t start, end; > >> - uint64_t i; > >> - > >> - for_each_mem_range(i, &start, &end) { > >> - cmem->ranges[cmem->nr_ranges].start = start; > >> - cmem->ranges[cmem->nr_ranges].end = end - 1; > >> - cmem->nr_ranges++; > >> - } > >> - > >> - return 0; > >> -} > >> - > >> /* > >> * Add the "mem=size@start" command line parameter to command line, indicating the > >> * memory region the new kernel can use to boot into. > >> diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c > >> index 808e872f4063..fdc6695e8588 100644 > >> --- a/arch/riscv/kernel/machine_kexec_file.c > >> +++ b/arch/riscv/kernel/machine_kexec_file.c > >> @@ -37,32 +37,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image) > >> } > >> > >> #ifdef CONFIG_CRASH_DUMP > >> -unsigned int arch_get_system_nr_ranges(void) > >> -{ > >> - unsigned int nr_ranges = 2 + crashk_cma_cnt; /* For exclusion of crashkernel region */ > >> - u64 i; > >> - phys_addr_t start, end; > >> - > >> - for_each_mem_range(i, &start, &end) > >> - nr_ranges++; > >> - > >> - return nr_ranges; > >> -} > >> - > >> -int arch_crash_populate_cmem(struct crash_mem *cmem) > >> -{ > >> - u64 i; > >> - phys_addr_t start, end; > >> - > >> - for_each_mem_range(i, &start, &end) { > >> - cmem->ranges[cmem->nr_ranges].start = start; > >> - cmem->ranges[cmem->nr_ranges].end = end - 1; > >> - cmem->nr_ranges++; > >> - } > >> - > >> - return 0; > >> -} > >> - > >> static char *setup_kdump_cmdline(struct kimage *image, char *cmdline, > >> unsigned long cmdline_len) > >> { > >> diff --git a/kernel/crash_core.c b/kernel/crash_core.c > >> index 2b36aa9fade0..77285ae3ce60 100644 > >> --- a/kernel/crash_core.c > >> +++ b/kernel/crash_core.c > >> @@ -281,8 +281,29 @@ static struct crash_mem *alloc_cmem(unsigned int nr_ranges) > >> return cmem; > >> } > >> > >> -unsigned int __weak arch_get_system_nr_ranges(void) { return 0; } > >> -int __weak arch_crash_populate_cmem(struct crash_mem *cmem) { return -1; } > >> +unsigned int __weak arch_get_system_nr_ranges(void) > >> +{ > >> + unsigned int nr_ranges = 2 + crashk_cma_cnt; /* crashk_res + crashk_low_res, +CMA splits */ > >> + phys_addr_t start, end; > >> + u64 i; > >> + > >> + for_each_mem_range(i, &start, &end) > >> + nr_ranges++; > >> + return nr_ranges; > >> +} > >> + > >> +int __weak arch_crash_populate_cmem(struct crash_mem *cmem) > >> +{ > >> + phys_addr_t start, end; > >> + u64 i; > >> + > >> + for_each_mem_range(i, &start, &end) { > >> + cmem->ranges[cmem->nr_ranges].start = start; > >> + cmem->ranges[cmem->nr_ranges].end = end - 1; > >> + cmem->nr_ranges++; > >> + } > >> + return 0; > >> +} > >> int __weak arch_crash_exclude_ranges(struct crash_mem *cmem) { return 0; } > >> > >> int __weak arch_crash_exclude_mem_range(struct crash_mem **mem, > >> -- > >> 2.43.0 > >> >