linux-kernel - Re: [RFC PATCH 1/4] hazptr: Add initial implementation of hazard pointers

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Message-ID: <48992c9f-6c61-4716-977c-66e946adb399@efficios.com>
Date: Wed, 25 Sep 2024 15:10:11 +0200
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Jonas Oberhauser <jonas.oberhauser@...weicloud.com>,
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org, linux-mm@...ck.org,
 lkmm@...ts.linux.dev, "Paul E. McKenney" <paulmck@...nel.org>,
 Frederic Weisbecker <frederic@...nel.org>,
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
 Joel Fernandes <joel@...lfernandes.org>,
 Josh Triplett <josh@...htriplett.org>, Uladzislau Rezki <urezki@...il.com>,
 Steven Rostedt <rostedt@...dmis.org>, Lai Jiangshan
 <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
 Mark Rutland <mark.rutland@....com>, Thomas Gleixner <tglx@...utronix.de>,
 Kent Overstreet <kent.overstreet@...il.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Vlastimil Babka <vbabka@...e.cz>, maged.michael@...il.com,
 Neeraj Upadhyay <neeraj.upadhyay@....com>
Subject: Re: [RFC PATCH 1/4] hazptr: Add initial implementation of hazard
 pointers

On 2024-09-25 14:47, Mathieu Desnoyers wrote:
[...]

> Like so:
> 
> #include <stdio.h>
> 
> #define __str_1(x)  #x
> #define __str(x)    __str_1(x)
> 
> /* x86-64 */
> #define bne_ptr(_a, _b, _label) \
>      asm goto ( \
>          "cmpq %[a], %[b]\n\t" \
>          "jne %l[" __str(_label) "]\n\t" \
>          : : [a] "r" (_a), [b] "r" (_b) \
>          : : _label)
> 
> int x;
> 
> int v[2];
> 
> int main(void)
> {
>      bne_ptr(v, v + 1, label_same);
>      x = 1;
> label_same:

Note that this label should probably be called "label_ne".
I flipped the macro logic without changing the labels.

Thanks,

Mathieu

>      printf("%d\n", x);
>      return 0;
> }
> 
> 
>>
>> Regards,
>> Boqun
>>
>>> Thanks,
>>>
>>> Mathieu
>>>
>>>> Regards,
>>>> Boqun
>>>>
>>>>>
>>>>> Have fun,
>>>>>      jonas
>>>>>
>>>
>>> -- 
>>> Mathieu Desnoyers
>>> EfficiOS Inc.
>>> https://www.efficios.com
>>>
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com