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Aneesh Kumar K.V 787d563b86 mm/debug_vm_pgtable: fix kernel crash by checking for THP support 
Architectures can have CONFIG_TRANSPARENT_HUGEPAGE enabled but no THP
support enabled based on platforms.  For ex: with 4K PAGE_SIZE ppc64
supports THP only with radix translation.

This results in below crash when running with hash translation and 4K
PAGE_SIZE.

    kernel BUG at arch/powerpc/include/asm/book3s/64/hash-4k.h:140!
    cpu 0x61: Vector: 700 (Program Check) at [c000000ff948f860]
        pc: debug_vm_pgtable+0x480/0x8b0
        lr: debug_vm_pgtable+0x474/0x8b0
    ...
        debug_vm_pgtable+0x374/0x8b0 (unreliable)
        do_one_initcall+0x98/0x4f0
        kernel_init_freeable+0x330/0x3fc
        kernel_init+0x24/0x148

Check for THP support correctly

Link: http://lkml.kernel.org/r/20200608125252.407659-1-aneesh.kumar@linux.ibm.com
Fixes: 399145f9eb ("mm/debug: add tests validating architecture page table helpers")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-10 19:14:18 -07:00
arch
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fs nilfs2: fix null pointer dereference at nilfs_segctor_do_construct() 2020-06-10 19:14:17 -07:00
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kernel kcov: check kcov_softirq in kcov_remote_stop() 2020-06-10 19:14:17 -07:00
lib lib: fix bitmap_parse() on 64-bit big endian archs 2020-06-10 19:14:17 -07:00
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mm mm/debug_vm_pgtable: fix kernel crash by checking for THP support 2020-06-10 19:14:18 -07:00
net
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scripts checkpatch: correct check for kernel parameters doc 2020-06-10 19:14:17 -07:00
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README 

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,
several of them using the Restructured Text markup notation.

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.