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From: Arnd Bergmann <arnd@arndb.de>
To: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: linux-arch <linux-arch@vger.kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrey Konovalov <andreyknvl@google.com>,
	Aleksa Sarai <cyphar@cyphar.com>, Ingo Molnar <mingo@kernel.org>,
	Khalid Aziz <khalid.aziz@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"open list:SYNOPSYS ARC ARCHITECTURE"
	<linux-snps-arc@lists.infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC 1/4] asm-generic/uaccess: don't define inline functions if noinline lib/* in use
Date: Thu, 16 Jan 2020 12:43:39 +0100
Message-ID: <CAK8P3a398-ojtETr9A7YsGTHBnmqyiykcC0YmHQSL5Cw1jy=Ew@mail.gmail.com> (raw)
In-Reply-To: <6eb7587b-c3bc-691d-9d27-d4e687114a42@synopsys.com>

On Thu, Jan 16, 2020 at 12:02 AM Vineet Gupta
<Vineet.Gupta1@synopsys.com> wrote:
> On 1/14/20 12:57 PM, Arnd Bergmann wrote:
> > On Tue, Jan 14, 2020 at 9:08 PM Vineet Gupta <Vineet.Gupta1@synopsys.com> wrote:
> >> There are 2 generic varaints of strncpy_from_user() / strnlen_user()
> >>  (1). inline version in asm-generic/uaccess.h
> >>  (2). optimized word-at-a-time version in lib/*
> >>
> >> This patch disables #1 if #2 selected. This allows arches to continue
> >> reusing asm-generic/uaccess.h for rest of code
> >>
> >> This came up when switching ARC to generic word-at-a-time interface
> >>
> >> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
> > This looks like a useful change, but I think we can do even better: It
> > seems that
> > there are no  callers of __strnlen_user or __strncpy_from_user  in the
> > kernel today, so these should not be defined either when the Kconfig symbols
> > are set. Also, I would suggest moving the 'extern' declaration for the two
> > functions into the #else branch of the conditional so it does not need to be
> > duplicated.
>
> Given where things seem to be heading, do u still want an updated patch for this
> or do u plan to ditch the inline version in short term anyways.

I'm trying to come up with a cleanup series now that I'll send you.
You can base on top of that if you like.

     Arnd

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Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14 20:08 [RFC 0/4] Switching ARC to optimized generic strncpy_from_user Vineet Gupta
2020-01-14 20:08 ` [RFC 1/4] asm-generic/uaccess: don't define inline functions if noinline lib/* in use Vineet Gupta
2020-01-14 20:57   ` Arnd Bergmann
2020-01-15 23:01     ` Vineet Gupta
2020-01-16 11:43       ` Arnd Bergmann [this message]
2020-01-14 21:32   ` Linus Torvalds
2020-01-15  9:08     ` Arnd Bergmann
2020-01-15 14:12       ` Al Viro
2020-01-15 14:21         ` Arnd Bergmann
2020-01-14 20:08 ` [RFC 2/4] lib/strncpy_from_user: Remove redundant user space pointer range check Vineet Gupta
2020-01-14 21:22   ` Linus Torvalds
2020-01-14 21:52     ` Vineet Gupta
2020-01-14 23:46     ` Al Viro
2020-01-15 14:42   ` Andrey Konovalov
2020-01-15 23:00     ` Vineet Gupta
2020-01-14 20:08 ` [RFC 3/4] ARC: uaccess: remove noinline variants of __strncpy_from_user() and friends Vineet Gupta
2020-01-14 20:08 ` [RFC 4/4] ARC: uaccess: use optimized generic __strnlen_user/__strncpy_from_user Vineet Gupta
2020-01-14 20:42   ` Arnd Bergmann
2020-01-14 21:36     ` Vineet Gupta
2020-01-14 21:49       ` Linus Torvalds
2020-01-14 22:14         ` Vineet Gupta

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