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From: Josef Bacik <josef@toxicpanda.com>
To: David Laight <David.Laight@ACULAB.COM>,
	Al Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@lst.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"kernel-team@fb.com" <kernel-team@fb.com>,
	"willy@infradead.org" <willy@infradead.org>
Subject: Re: [PATCH][v2] proc: use vmalloc for our kernel buffer
Date: Thu, 13 Aug 2020 17:31:54 -0400	[thread overview]
Message-ID: <cd5ecedc-cef1-4325-36aa-e7b06485f3a1@toxicpanda.com> (raw)
In-Reply-To: <3612878ce143427b89a70de3abfb657d@AcuMS.aculab.com>

On 8/13/20 5:10 PM, David Laight wrote:
> From: Josef Bacik
>> Sent: 13 August 2020 18:19
> ...
>> We wouldn't even need the extra +1 part, since we're only copying in how much
>> the user wants anyway, we could just go ahead and convert this to
>>
>> left -= snprintf(buffer, left, "0x%04x\n", *(unsigned int *) table->data);
>>
>> and be fine, right?  Or am I misunderstanding what you're looking for?  Thanks,
> 
> Doesn't that need to be scnprintf()?
> IIRC snprintf() returns the number of bytes that would have been
> written were the buffer infinite size?
> (I suspect this is an 'accidental' return value from the original
> SYSV? userspace implementation that just dumped characters that
> wouldn't fit in the buffer somewhere.)
> 

Yeah, if you look at the patches I just sent you'll notice I used scnprintf() 
everywhere.  Thanks,

Josef

  reply	other threads:[~2020-08-13 21:31 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-13 14:53 [PATCH] " Josef Bacik
2020-08-13 14:59 ` Matthew Wilcox
2020-08-13 15:08   ` Josef Bacik
2020-08-13 15:33 ` [PATCH][v2] " Josef Bacik
2020-08-13 15:37   ` Christoph Hellwig
2020-08-13 15:40     ` Josef Bacik
2020-08-13 15:41       ` Christoph Hellwig
2020-08-13 16:20         ` Al Viro
2020-08-13 17:19           ` Josef Bacik
2020-08-13 17:31             ` Al Viro
2020-08-13 17:36               ` Josef Bacik
2020-08-13 21:10             ` David Laight
2020-08-13 21:31               ` Josef Bacik [this message]
2020-08-13 16:19 ` [PATCH] " David Laight
2020-08-13 16:21   ` Al Viro
2020-08-13 17:08   ` Josef Bacik

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