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2ebc3b68ac
Patch series "mm: fixes for fallouts from mem_init() cleanup". These are the fixes for fallouts from mem_init() cleanup reported by Nathan Chancellor and kbuild. The details are in the commit messages. This patch (of 2): Kernel test robot reports the following crash on 32-bit system with FLATMEM and DEBUG_VM_PGFLAGS enabled: [ 0.478822][ T0] kernel BUG at include/linux/page-flags.h:536! [ 0.479312][ T0] Oops: invalid opcode: 0000 [#1] PREEMPT SMP [ 0.479768][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.14.0-rc6-00357-g8268af309d07 #1 [ 0.480470][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 0.481260][ T0] EIP: reserve_bootmem_region (include/linux/page-flags.h:536) [ 0.481683][ T0] Code: 5d c3 01 f1 89 c8 ba e1 38 f4 c3 e8 1e 37 8e fc 0f 0b b8 90 e2 62 c4 e8 e2 05 5e fc 01 f1 89 c8 ba be 85 f7 c3 e8 04 37 8e fc <0f> 0b b8 80 e2 62 c4 e8 c8 05 5e fc 55 89 e5 53 57 56 83 ec 10 89 [ 0.483177][ T0] EAX: 00000000 EBX: c425df50 ECX: 00000000 EDX: 00000000 [ 0.483712][ T0] ESI: 017ffc00 EDI: ffffffff EBP: c425df34 ESP: c425df2c [ 0.484248][ T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210046 [ 0.484846][ T0] CR0: 80050033 CR2: 00000000 CR3: 04b48000 CR4: 00000090 [ 0.485376][ T0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 0.485907][ T0] DR6: fffe0ff0 DR7: 00000400 [ 0.486253][ T0] Call Trace: [ 0.486494][ T0] ? __die_body (arch/x86/kernel/dumpstack.c:478) [ 0.486822][ T0] ? die (arch/x86/kernel/dumpstack.c:?) [ 0.487099][ T0] ? do_trap (arch/x86/kernel/traps.c:? arch/x86/kernel/traps.c:197) [ 0.487409][ T0] ? do_error_trap (arch/x86/kernel/traps.c:217) [ 0.487752][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536) [ 0.488153][ T0] ? exc_overflow (arch/x86/kernel/traps.c:301) [ 0.488490][ T0] ? handle_invalid_op (arch/x86/kernel/traps.c:254) [ 0.488869][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536) [ 0.489271][ T0] ? exc_invalid_op (arch/x86/kernel/traps.c:316) [ 0.489619][ T0] ? handle_exception (arch/x86/entry/entry_32.S:1055) [ 0.489996][ T0] ? exc_overflow (arch/x86/kernel/traps.c:301) [ 0.490332][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536) [ 0.490733][ T0] ? exc_overflow (arch/x86/kernel/traps.c:301) [ 0.491068][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536) [ 0.491470][ T0] memmap_init_reserved_pages (mm/memblock.c:2203) [ 0.491887][ T0] free_low_memory_core_early (mm/memblock.c:?) [ 0.492302][ T0] memblock_free_all (mm/memblock.c:2272 include/linux/atomic/atomic-arch-fallback.h:546 include/linux/atomic/atomic-long.h:123 include/linux/atomic/atomic-instrumented.h:3261 include/linux/mm.h:67 mm/memblock.c:2273) [ 0.492659][ T0] mem_init (arch/x86/mm/init_32.c:735) [ 0.492952][ T0] mm_core_init (mm/mm_init.c:2730) [ 0.493271][ T0] start_kernel (init/main.c:958) [ 0.493604][ T0] i386_start_kernel (arch/x86/kernel/head32.c:79) [ 0.493969][ T0] startup_32_smp (arch/x86/kernel/head_32.S:292) The crash happens because after commit |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.