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    SubjectRe: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable pagefault/preempt twice
    On Mon, May 18, 2020 at 11:48:43AM -0700, ira.weiny@intel.com wrote:
    > From: Ira Weiny <ira.weiny@intel.com>
    >
    > The kunmap_atomic clean up failed to remove one set of pagefault/preempt
    > enables when vaddr is not in the fixmap.
    >
    > Fixes: bee2128a09e6 ("arch/kunmap_atomic: consolidate duplicate code")
    > Signed-off-by: Ira Weiny <ira.weiny@intel.com>

    microblazeel works with this patch, as do the nosmp sparc32 boot tests,
    but sparc32 boot tests with SMP enabled still fail with lots of messages
    such as:

    BUG: Bad page state in process swapper/0 pfn:006a1
    page:f0933420 refcount:0 mapcount:1 mapping:(ptrval) index:0x1
    flags: 0x0()
    raw: 00000000 00000100 00000122 00000000 00000001 00000000 00000000 00000000
    page dumped because: nonzero mapcount
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B 5.7.0-rc6-next-20200518-00002-gb178d2d56f29 #1
    [f00e7ab8 :
    bad_page+0xa8/0x108 ]
    [f00e8b54 :
    free_pcppages_bulk+0x154/0x52c ]
    [f00ea024 :
    free_unref_page+0x54/0x6c ]
    [f00ed864 :
    free_reserved_area+0x58/0xec ]
    [f0527104 :
    kernel_init+0x14/0x110 ]
    [f000b77c :
    ret_from_kernel_thread+0xc/0x38 ]
    [00000000 :
    0x0 ]

    Code path leading to that message is different but always the same
    from free_unref_page().

    Still testing ppc images.

    Guenter

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