linux/Documentation/admin-guide/kdump, branch v6.4

mm, treewide: redefine MAX_ORDER sanely

2023-04-06T02:42:46Z

MAX_ORDER currently defined as number of orders page allocator supports: user can ask buddy allocator for page order between 0 and MAX_ORDER-1. This definition is counter-intuitive and lead to number of bugs all over the kernel. Change the definition of MAX_ORDER to be inclusive: the range of orders user can ask from buddy allocator is 0..MAX_ORDER now. [kirill@shutemov.name: fix min() warning] Link: https://lkml.kernel.org/r/20230315153800.32wib3n5rickolvh@box [akpm@linux-foundation.org: fix another min_t warning] [kirill@shutemov.name: fixups per Zi Yan] Link: https://lkml.kernel.org/r/20230316232144.b7ic4cif4kjiabws@box.shutemov.name [akpm@linux-foundation.org: fix underlining in docs] Link: https://lore.kernel.org/oe-kbuild-all/202303191025.VRCTk6mP-lkp@intel.com/ Link: https://lkml.kernel.org/r/20230315113133.11326-11-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov Reviewed-by: Michael Ellerman [powerpc] Cc: "Kirill A. Shutemov" Cc: Zi Yan Signed-off-by: Andrew Morton

Merge tag 'printk-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

2023-02-23T21:49:45Z

Pull printk updates from Petr Mladek: - Refactor printk code for formatting messages that are shown on consoles. This is a preparatory step for introducing atomic consoles which could not share the global buffers - Prevent memory leak when removing printk index in debugfs - Dump also the newest printk message by the sample gdbmacro - Fix a compiler warning * tag 'printk-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printf: fix errname.c list kernel/printk/index.c: fix memory leak with using debugfs_lookup() printk: Use scnprintf() to print the message about the dropped messages on a console printk: adjust string limit macros printk: use printk_buffers for devkmsg printk: introduce console_prepend_dropped() for dropped messages printk: introduce printk_get_next_message() and printk_message printk: introduce struct printk_buffers console: Document struct console console: Use BIT() macros for @flags values printk: move size limit macros into internal.h docs: gdbmacros: print newest record

docs: gdbmacros: print newest record

2023-01-03T09:44:14Z

@head_id points to the newest record, but the printing loop exits when it increments to this value (before printing). Exit the printing loop after the newest record has been printed. The python-based function in scripts/gdb/linux/dmesg.py already does this correctly. Fixes: e60768311af8 ("scripts/gdb: update for lockless printk ringbuffer") Cc: stable@vger.kernel.org Signed-off-by: John Ogness Reviewed-by: Petr Mladek Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20221229134339.197627-1-john.ogness@linutronix.de

Documentation: kdump: describe VMCOREINFO export for RISCV64

2022-12-03T00:48:58Z

The following interrelated definitions and ranges are needed by the kdump crash tool, which are exported by "arch/riscv/kernel/crash_core.c": VA_BITS, PAGE_OFFSET, phys_ram_base, KERNEL_LINK_ADDR, MODULES_VADDR ~ MODULES_END, VMALLOC_START ~ VMALLOC_END, VMEMMAP_START ~ VMEMMAP_END, Document these RISCV64 exports above. Reviewed-by: Bagas Sanjaya Signed-off-by: Xianting Tian Acked-by: Baoquan He Link: https://lore.kernel.org/r/20221026144208.373504-3-xianting.tian@linux.alibaba.com [Palmer: wrap commit text] Signed-off-by: Palmer Dabbelt

Remove duplicate words inside documentation

2022-09-27T19:21:43Z

I have removed repeated `the` inside the documentation Signed-off-by: Akhil Raj Link: https://lore.kernel.org/r/20220827145359.32599-1-lf32.dev@gmail.com Signed-off-by: Jonathan Corbet

Merge branch 'akpm' (patches from Andrew)

2022-03-24T21:14:07Z

Merge more updates from Andrew Morton: "Various misc subsystems, before getting into the post-linux-next material. 41 patches. Subsystems affected by this patch series: procfs, misc, core-kernel, lib, checkpatch, init, pipe, minix, fat, cgroups, kexec, kdump, taskstats, panic, kcov, resource, and ubsan" * emailed patches from Andrew Morton : (41 commits) Revert "ubsan, kcsan: Don't combine sanitizer with kcov on clang" kernel/resource: fix kfree() of bootmem memory again kcov: properly handle subsequent mmap calls kcov: split ioctl handling into locked and unlocked parts panic: move panic_print before kmsg dumpers panic: add option to dump all CPUs backtraces in panic_print docs: sysctl/kernel: add missing bit to panic_print taskstats: remove unneeded dead assignment kasan: no need to unset panic_on_warn in end_report() ubsan: no need to unset panic_on_warn in ubsan_epilogue() panic: unset panic_on_warn inside panic() docs: kdump: add scp example to write out the dump file docs: kdump: update description about sysfs file system support arm64: mm: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef x86/setup: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef riscv: mm: init: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef kexec: make crashk_res, crashk_low_res and crash_notes symbols always visible cgroup: use irqsave in cgroup_rstat_flush_locked(). fat: use pointer to simple type in put_user() minix: fix bug when opening a file with O_DIRECT ...

docs: kdump: add scp example to write out the dump file

2022-03-24T02:00:34Z

Except cp and makedumpfile, add scp example to write out the dump file. Link: https://lkml.kernel.org/r/1644324666-15947-3-git-send-email-yangtiezhu@loongson.cn Signed-off-by: Tiezhu Yang Acked-by: Baoquan He Cc: Andrey Ryabinin Cc: Jonathan Corbet Cc: Marco Elver Cc: Xuefeng Li Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

docs: kdump: update description about sysfs file system support

2022-03-24T02:00:34Z

Patch series "Update doc and fix some issues about kdump", v2. This patch (of 5): After commit 6a108a14fa35 ("kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT"), "Configure standard kernel features (for small systems)" is not exist, we should use "Configure standard kernel features (expert users)" now. Link: https://lkml.kernel.org/r/1644324666-15947-1-git-send-email-yangtiezhu@loongson.cn Link: https://lkml.kernel.org/r/1644324666-15947-2-git-send-email-yangtiezhu@loongson.cn Signed-off-by: Tiezhu Yang Acked-by: Baoquan He Cc: Baoquan He Cc: Jonathan Corbet Cc: Marco Elver Cc: Andrey Ryabinin Cc: Xuefeng Li Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Documentation: vmcoreinfo: Fix htmldocs warning

2022-03-09T12:16:33Z

Since commit 2369f171d5c5 ("arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges"), Stephen reports a warning when building htmldocs: | Documentation/admin-guide/kdump/vmcoreinfo.rst:498: WARNING: Title underline too short. Extend the underline to squash the warning. Fixes: 2369f171d5c5 ("arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges") Reported-by: Stephen Rothwell Signed-off-by: Will Deacon

arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges

2022-03-07T21:25:47Z

The following interrelated ranges are needed by the kdump crash tool: MODULES_VADDR ~ MODULES_END, VMALLOC_START ~ VMALLOC_END, VMEMMAP_START ~ VMEMMAP_END Since these values change from time to time, it is preferable to export them via vmcoreinfo than to change the crash's code frequently. Signed-off-by: Huang Shijie Link: https://lore.kernel.org/r/20220209092642.9181-1-shijie@os.amperecomputing.com Signed-off-by: Will Deacon