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    Subject[PATCH AUTOSEL 4.4 55/63] hpet: Fix missing '=' character in the __setup() code of hpet_mmap_enable
    Date
    From: Buland Singh <bsingh@redhat.com>

    [ Upstream commit 24d48a61f2666630da130cc2ec2e526eacf229e3 ]

    Commit '3d035f580699 ("drivers/char/hpet.c: allow user controlled mmap for
    user processes")' introduced a new kernel command line parameter hpet_mmap,
    that is required to expose the memory map of the HPET registers to
    user-space. Unfortunately the kernel command line parameter 'hpet_mmap' is
    broken and never takes effect due to missing '=' character in the __setup()
    code of hpet_mmap_enable.

    Before this patch:

    dmesg output with the kernel command line parameter hpet_mmap=1

    [ 0.204152] HPET mmap disabled

    dmesg output with the kernel command line parameter hpet_mmap=0

    [ 0.204192] HPET mmap disabled

    After this patch:

    dmesg output with the kernel command line parameter hpet_mmap=1

    [ 0.203945] HPET mmap enabled

    dmesg output with the kernel command line parameter hpet_mmap=0

    [ 0.204652] HPET mmap disabled

    Fixes: 3d035f580699 ("drivers/char/hpet.c: allow user controlled mmap for user processes")
    Signed-off-by: Buland Singh <bsingh@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/char/hpet.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
    index 240b6cf1d97c..72e073895ed9 100644
    --- a/drivers/char/hpet.c
    +++ b/drivers/char/hpet.c
    @@ -376,7 +376,7 @@ static __init int hpet_mmap_enable(char *str)
    pr_info("HPET mmap %s\n", hpet_mmap_enabled ? "enabled" : "disabled");
    return 1;
    }
    -__setup("hpet_mmap", hpet_mmap_enable);
    +__setup("hpet_mmap=", hpet_mmap_enable);

    static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
    {
    --
    2.19.1
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