linux-kernel - RE: [PATCH] vsprintf: Do not break early boot with probing addresses

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Message-ID: <45348cf615fe40d383c1a25688d4a88f@AcuMS.aculab.com>
Date:   Tue, 14 May 2019 08:28:21 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Sergey Senozhatsky' <sergey.senozhatsky.work@...il.com>,
        Petr Mladek <pmladek@...e.com>
CC:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        'christophe leroy' <christophe.leroy@....fr>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        "Tobin C . Harding" <me@...in.cc>, Michal Hocko <mhocko@...e.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Russell Currey <ruscur@...sell.cc>,
        "Stephen Rothwell" <sfr@...abs.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: RE: [PATCH] vsprintf: Do not break early boot with probing addresses

> And I like Steven's "(fault)" idea.
> How about this:
> 
> 	if ptr < PAGE_SIZE		-> "(null)"
> 	if IS_ERR_VALUE(ptr)		-> "(fault)"
> 
> 	-ss

Or:
	if (ptr < PAGE_SIZE)
		return ptr ? "(null+)" : "(null)";
	if IS_ERR_VALUE(ptr)
		return "(errno)"

	David

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