From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@ozlabs.org
Cc: Paul Mackerras <paulus@samba.org>, linux-kernel@vger.kernel.org
Subject: Re: [RFC][POWERPC] Provide a way to protect 4k subpages when using 64k pages
Date: Fri, 7 Dec 2007 13:03:41 +0100 [thread overview]
Message-ID: <200712071303.42413.arnd@arndb.de> (raw)
In-Reply-To: <18264.58263.818005.757831@cargo.ozlabs.ibm.com>
On Friday 07 December 2007, Paul Mackerras wrote:
> I have re-purposed the ioperm system call for this. =A0The old ioperm
> system call never did anything (except return an ENOSYS error) and in
> fact never could have actually been useful for anything on the PowerPC
> architecture, so nothing ever used it.
Couldn't there be a program that relies on ioperm to return -ENOSYS on
powerpc in order to fall back on some other method of I/O access?
The risk of actually breaking something is certainly low, but I think
you can never be sure here, so why not use a new syscall number?
Arnd <><
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@ozlabs.org
Cc: Paul Mackerras <paulus@samba.org>, linux-kernel@vger.kernel.org
Subject: Re: [RFC][POWERPC] Provide a way to protect 4k subpages when using 64k pages
Date: Fri, 7 Dec 2007 13:03:41 +0100 [thread overview]
Message-ID: <200712071303.42413.arnd@arndb.de> (raw)
In-Reply-To: <18264.58263.818005.757831@cargo.ozlabs.ibm.com>
On Friday 07 December 2007, Paul Mackerras wrote:
> I have re-purposed the ioperm system call for this. The old ioperm
> system call never did anything (except return an ENOSYS error) and in
> fact never could have actually been useful for anything on the PowerPC
> architecture, so nothing ever used it.
Couldn't there be a program that relies on ioperm to return -ENOSYS on
powerpc in order to fall back on some other method of I/O access?
The risk of actually breaking something is certainly low, but I think
you can never be sure here, so why not use a new syscall number?
Arnd <><
next prev parent reply other threads:[~2007-12-07 12:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-07 6:09 [RFC][POWERPC] Provide a way to protect 4k subpages when using 64k pages Paul Mackerras
2007-12-07 12:03 ` Arnd Bergmann [this message]
2007-12-07 12:03 ` Arnd Bergmann
2007-12-11 15:53 ` Christoph Hellwig
2007-12-11 21:21 ` Arnd Bergmann
2007-12-11 21:21 ` Arnd Bergmann
2007-12-11 21:37 ` Paul Mackerras
2007-12-11 23:38 ` Benjamin Herrenschmidt
2007-12-11 23:38 ` Benjamin Herrenschmidt
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