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GET /api/patches/2218962/?format=api
{ "id": 2218962, "url": "http://patchwork.ozlabs.org/api/patches/2218962/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402072701.628293-9-ruanjinjie@huawei.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260402072701.628293-9-ruanjinjie@huawei.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260402072701.628293-9-ruanjinjie@huawei.com/", "date": "2026-04-02T07:26:54", "name": "[v12,08/15] crash: Add crash_prepare_headers() to exclude crash kernel memory", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "b33cded3ed0a0e9fd2f39db3aa0c96c97b0bdf25", "submitter": { "id": 84791, "url": "http://patchwork.ozlabs.org/api/people/84791/?format=api", "name": "Jinjie Ruan", "email": "ruanjinjie@huawei.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402072701.628293-9-ruanjinjie@huawei.com/mbox/", "series": [ { "id": 498443, "url": "http://patchwork.ozlabs.org/api/series/498443/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498443", "date": "2026-04-02T07:26:46", "name": "arm64/riscv: Add support for crashkernel CMA reservation", "version": 12, "mbox": "http://patchwork.ozlabs.org/series/498443/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218962/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218962/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19199-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256\n header.s=dkim header.b=fqpO3Hvp;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Thu, 2 Apr\n 2026 15:26:05 +0800" ], "ARC-Seal": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1775114772;\n\tcv=none;\n b=lJgG77oX9izDrkfwAaRQJ64JBcqx3Bp4Hu8lzkZCka4iTOME4QBpA+JQx2q9/JDjnFVcq33RvsKnDdHh5SWOMAGJgJTKQnPI0+qUqoWcqIZVrRXXoK0KT6WN0fWT+CGguv1qzyf6EqdYDnX6GoMKGKhsCtaqVMxwIFFzRDhjYsdlE+FK7oeOE9p7gcatCvaEyi5xF+Ncb5stw42tSYuMRNRF2AMZSJMrel5Zza9RyikwEFaJ0dUgYSCq4c+5jiZ6A5fa+ZsWnTHsard5MtYeXdRd9yxHj6zodOp8DuoXydxOFyHqyT5tnXbiYgAkwtIoZt2bPGSXYvQflYEgpg6JgQ==", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707;\n\tt=1775114772; c=relaxed/relaxed;\n\tbh=a5oa/1akbFaboX4rfV7+Vg9uBkAhjnDcb7jWorQ4YFU=;\n\th=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version:Content-Type;\n b=aOl19UblbRloUTk5S4EDPXsyk+1o7voIIlO6G+dbClpp1aPCN8M8lI8CbUdCANHBdgP9ZET3zMjgiDEXEd0E/sYuJ4Etjvyq9jb8MW/q7PjPB2SvwpjtCvXyw1YeO2/M6C7HBCCG2Mm/lRab4AruqAWciKa9FCOLFgqSq0KE1EI4PaFscIqd4ZDnT9ZxxVqagh1C3fABUpGSxmAEe350cG6AaV8YcItb9zhI24DWBd4AhB0mzMXCvlD5UHKxcxQzL2/b8t2gfHkjMamlvqJcl2cYHmtF3rLiRGQg+hhDDuil53jIb5v4HgCf3sL5qpUJ0LV2E7ReHEo+kkSEbZwsnA==", "ARC-Authentication-Results": "i=1; lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=huawei.com;\n dkim=pass (1024-bit key;\n unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256\n header.s=dkim header.b=fqpO3Hvp; dkim-atps=neutral;\n spf=pass (client-ip=113.46.200.220; helo=canpmsgout05.his.huawei.com;\n envelope-from=ruanjinjie@huawei.com;\n receiver=lists.ozlabs.org) smtp.mailfrom=huawei.com", "dkim-signature": "v=1; a=rsa-sha256; d=huawei.com; s=dkim;\n\tc=relaxed/relaxed; q=dns/txt;\n\th=From;\n\tbh=a5oa/1akbFaboX4rfV7+Vg9uBkAhjnDcb7jWorQ4YFU=;\n\tb=fqpO3HvpIjuAcuK0qAVSEZLAj73VpXyTH01PSTMPaRqRwgyGBa4gPp9dgSa5NyKMyIXjIrgPm\n\tAQxT8ME9ISrCOTJjv/+U1ydwIc7H0xGh87cLN+Up5FXVPDzghq6wk2BpjRl0Go8AXaMJRDhGs7V\n\t9ihJ7PMu9s3QAj+Hj82lfYw=", "From": "Jinjie Ruan <ruanjinjie@huawei.com>", "To": "<corbet@lwn.net>, <skhan@linuxfoundation.org>, <catalin.marinas@arm.com>,\n\t<will@kernel.org>, <chenhuacai@kernel.org>, <kernel@xen0n.name>,\n\t<maddy@linux.ibm.com>, <mpe@ellerman.id.au>, <npiggin@gmail.com>,\n\t<chleroy@kernel.org>, <pjw@kernel.org>, <palmer@dabbelt.com>,\n\t<aou@eecs.berkeley.edu>, <alex@ghiti.fr>, <tglx@kernel.org>,\n\t<mingo@redhat.com>, <bp@alien8.de>, <dave.hansen@linux.intel.com>,\n\t<hpa@zytor.com>, <robh@kernel.org>, <saravanak@kernel.org>,\n\t<akpm@linux-foundation.org>, <bhe@redhat.com>, <vgoyal@redhat.com>,\n\t<dyoung@redhat.com>, <rdunlap@infradead.org>, <peterz@infradead.org>,\n\t<pawan.kumar.gupta@linux.intel.com>, <feng.tang@linux.alibaba.com>,\n\t<dapeng1.mi@linux.intel.com>, <kees@kernel.org>, <elver@google.com>,\n\t<paulmck@kernel.org>, <lirongqing@baidu.com>, <rppt@kernel.org>,\n\t<leitao@debian.org>, <ardb@kernel.org>, <jbohac@suse.cz>,\n\t<cfsworks@gmail.com>, <tangyouling@kylinos.cn>, <sourabhjain@linux.ibm.com>,\n\t<ritesh.list@gmail.com>, <hbathini@linux.ibm.com>, <eajames@linux.ibm.com>,\n\t<guoren@kernel.org>, <songshuaishuai@tinylab.org>, <kevin.brodsky@arm.com>,\n\t<vishal.moola@gmail.com>, <junhui.liu@pigmoral.tech>, <coxu@redhat.com>,\n\t<fuqiang.wang@easystack.cn>, <liaoyuanhong@vivo.com>,\n\t<takahiro.akashi@linaro.org>, <james.morse@arm.com>, <lizhengyu3@huawei.com>,\n\t<x86@kernel.org>, <linux-doc@vger.kernel.org>,\n\t<linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,\n\t<loongarch@lists.linux.dev>, <linuxppc-dev@lists.ozlabs.org>,\n\t<linux-riscv@lists.infradead.org>, <devicetree@vger.kernel.org>,\n\t<kexec@lists.infradead.org>", "CC": "<ruanjinjie@huawei.com>", "Subject": "[PATCH v12 08/15] crash: Add crash_prepare_headers() to exclude crash\n kernel memory", "Date": "Thu, 2 Apr 2026 15:26:54 +0800", "Message-ID": "<20260402072701.628293-9-ruanjinjie@huawei.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20260402072701.628293-1-ruanjinjie@huawei.com>", "References": "<20260402072701.628293-1-ruanjinjie@huawei.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-Originating-IP": "[10.90.53.73]", "X-ClientProxiedBy": "kwepems100002.china.huawei.com (7.221.188.206) To\n dggpemf500011.china.huawei.com (7.185.36.131)", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "The crash memory alloc, and the exclude of crashk_res, crashk_low_res\nand crashk_cma memory are almost identical across different architectures,\nhandling them in the crash core would eliminate a lot of duplication, so\nadd crash_prepare_headers() helper to handle them in the common code.\n\nTo achieve the above goal, three architecture-specific functions are\nintroduced:\n\n- arch_get_system_nr_ranges(). Pre-counts the max number of memory ranges.\n\n- arch_crash_populate_cmem(). Collects the memory ranges and fills them\n into cmem.\n\n- arch_crash_exclude_ranges(). Architecture's additional crash memory\n ranges exclusion, defaulting to empty.\n\nReviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>\nAcked-by: Baoquan He <bhe@redhat.com>\nAcked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>\nSigned-off-by: Jinjie Ruan <ruanjinjie@huawei.com>\n---\n include/linux/crash_core.h | 5 +++\n kernel/crash_core.c | 82 ++++++++++++++++++++++++++++++++++++--\n 2 files changed, 84 insertions(+), 3 deletions(-)", "diff": "diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h\nindex d35726d6a415..033b20204aca 100644\n--- a/include/linux/crash_core.h\n+++ b/include/linux/crash_core.h\n@@ -66,6 +66,8 @@ extern int crash_exclude_mem_range(struct crash_mem *mem,\n \t\t\t\t unsigned long long mend);\n extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,\n \t\t\t\t void **addr, unsigned long *sz);\n+extern int crash_prepare_headers(int need_kernel_map, void **addr,\n+\t\t\t\t unsigned long *sz, unsigned long *nr_mem_ranges);\n \n struct kimage;\n struct kexec_segment;\n@@ -83,6 +85,9 @@ int kexec_should_crash(struct task_struct *p);\n int kexec_crash_loaded(void);\n void crash_save_cpu(struct pt_regs *regs, int cpu);\n extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);\n+extern unsigned int arch_get_system_nr_ranges(void);\n+extern int arch_crash_populate_cmem(struct crash_mem *cmem);\n+extern int arch_crash_exclude_ranges(struct crash_mem *cmem);\n \n #else /* !CONFIG_CRASH_DUMP*/\n struct pt_regs;\ndiff --git a/kernel/crash_core.c b/kernel/crash_core.c\nindex 2c1a3791e410..96a96e511f5a 100644\n--- a/kernel/crash_core.c\n+++ b/kernel/crash_core.c\n@@ -170,9 +170,6 @@ static inline resource_size_t crash_resource_size(const struct resource *res)\n \treturn !res->end ? 0 : resource_size(res);\n }\n \n-\n-\n-\n int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,\n \t\t\t void **addr, unsigned long *sz)\n {\n@@ -274,6 +271,85 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,\n \treturn 0;\n }\n \n+static struct crash_mem *alloc_cmem(unsigned int nr_ranges)\n+{\n+\tstruct crash_mem *cmem;\n+\n+\tcmem = kvzalloc_flex(*cmem, ranges, nr_ranges);\n+\tif (!cmem)\n+\t\treturn NULL;\n+\n+\tcmem->max_nr_ranges = nr_ranges;\n+\treturn cmem;\n+}\n+\n+unsigned int __weak arch_get_system_nr_ranges(void) { return 0; }\n+int __weak arch_crash_populate_cmem(struct crash_mem *cmem) { return -1; }\n+int __weak arch_crash_exclude_ranges(struct crash_mem *cmem) { return 0; }\n+\n+static int crash_exclude_core_ranges(struct crash_mem *cmem)\n+{\n+\tint ret, i;\n+\n+\t/* Exclude crashkernel region */\n+\tret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\tif (crashk_low_res.end) {\n+\t\tret = crash_exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end);\n+\t\tif (ret)\n+\t\t\treturn ret;\n+\t}\n+\n+\tfor (i = 0; i < crashk_cma_cnt; ++i) {\n+\t\tret = crash_exclude_mem_range(cmem, crashk_cma_ranges[i].start,\n+\t\t\t\t\t crashk_cma_ranges[i].end);\n+\t\tif (ret)\n+\t\t\treturn ret;\n+\t}\n+\n+\treturn 0;\n+}\n+\n+int crash_prepare_headers(int need_kernel_map, void **addr, unsigned long *sz,\n+\t\t\t unsigned long *nr_mem_ranges)\n+{\n+\tunsigned int max_nr_ranges;\n+\tstruct crash_mem *cmem;\n+\tint ret;\n+\n+\tmax_nr_ranges = arch_get_system_nr_ranges();\n+\tif (!max_nr_ranges)\n+\t\treturn -ENOMEM;\n+\n+\tcmem = alloc_cmem(max_nr_ranges);\n+\tif (!cmem)\n+\t\treturn -ENOMEM;\n+\n+\tret = arch_crash_populate_cmem(cmem);\n+\tif (ret)\n+\t\tgoto out;\n+\n+\tret = crash_exclude_core_ranges(cmem);\n+\tif (ret)\n+\t\tgoto out;\n+\n+\tret = arch_crash_exclude_ranges(cmem);\n+\tif (ret)\n+\t\tgoto out;\n+\n+\t/* Return the computed number of memory ranges, for hotplug usage */\n+\tif (nr_mem_ranges)\n+\t\t*nr_mem_ranges = cmem->nr_ranges;\n+\n+\tret = crash_prepare_elf64_headers(cmem, need_kernel_map, addr, sz);\n+\n+out:\n+\tkvfree(cmem);\n+\treturn ret;\n+}\n+\n /**\n * crash_exclude_mem_range - exclude a mem range for existing ranges\n * @mem: mem->range contains an array of ranges sorted in ascending order\n", "prefixes": [ "v12", "08/15" ] }