linux-kernel - Re: [PATCH] hpet: Fix missing '=' character in the __setup() code of hpet_mmap

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Date:   Thu, 20 Dec 2018 12:07:57 +0530
From:   Buland Singh <bsingh@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     clemens@...isch.de, arnd@...db.de, linux-kernel@...r.kernel.org,
        trivial@...nel.org, prarit@...hat.com
Subject: Re: [PATCH] hpet: Fix missing '=' character in the __setup() code of
 hpet_mmap_enable.

On 12/19/18 6:07 PM, Greg KH wrote:
> On Wed, Dec 19, 2018 at 05:34:32PM +0530, Buland Singh wrote:
>> On 12/19/18 3:16 PM, Greg KH wrote:
>>> On Wed, Dec 19, 2018 at 02:55:02PM +0530, Buland Singh wrote:
>>>> The kernel command parameter 'hpet_mmap' never takes effect due to missing
>>>> '=' character in the __setup() code of hpet_mmap_enable and the memory map
>>>> of the HPET registers never get expose to userspace.
>>>>
>>>> Signed-off-by: Buland Singh <bsingh@...hat.com>
>>>> ---
>>>>    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 4a22b4b41aef..9bffcd37cc7b 100644
>>>> --- a/drivers/char/hpet.c
>>>> +++ b/drivers/char/hpet.c
>>>> @@ -377,7 +377,7 @@ 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);
>>>
>>> What commit caused this bug?  Should this go to the stable kernel trees?
>>
>> Hello Greg,
>>
>> The commit id is 3d035f58. The bug is there since the initial patch which
>> introduced the kernel parameter 'hpet_mmap'. The fix should go to the
>> stable kernel trees.
> 
> Great, can you resend it with all of this information (a fixes: and cc:
> stable tag?)

Sure, I will send the v2 with all the information.

Regards,
Buland Singh