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

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Date:   Wed, 19 Dec 2018 17:34:32 +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 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.

Regards,
Buland Singh