linux-kernel - Re: [PATCH -next] printk: Use the BITS_PER

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Message-ID: <e333684b-6833-fb62-2c6e-480f14333f8a@huawei.com>
Date: Tue, 3 Sep 2024 11:39:27 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: John Ogness <john.ogness@...utronix.de>, <pmladek@...e.com>,
	<rostedt@...dmis.org>, <senozhatsky@...omium.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] printk: Use the BITS_PER_LONG macro



On 2024/9/2 20:07, John Ogness wrote:
> On 2024-09-02, Jinjie Ruan <ruanjinjie@...wei.com> wrote:
>> sizeof(unsigned long) * 8 is the number of bits in an unsigned long
>> variable, replace it with BITS_PER_LONG macro to make it simpler.
>>
>> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
>> ---
>>  kernel/printk/printk_ringbuffer.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/kernel/printk/printk_ringbuffer.h b/kernel/printk/printk_ringbuffer.h
>> index bd2a892deac1..7433fe477e08 100644
>> --- a/kernel/printk/printk_ringbuffer.h
>> +++ b/kernel/printk/printk_ringbuffer.h
>> @@ -122,7 +122,7 @@ enum desc_state {
>>  
>>  #define _DATA_SIZE(sz_bits)	(1UL << (sz_bits))
>>  #define _DESCS_COUNT(ct_bits)	(1U << (ct_bits))
>> -#define DESC_SV_BITS		(sizeof(unsigned long) * 8)
>> +#define DESC_SV_BITS		BITS_PER_LONG
> 
> We should also add:
> 
> #include <linux/bits.h>

maybe  #include <asm/bitsperlong.h> ?

> 
> John Ogness