From: Ralf Baechle <ralf@linux-mips.org>
To: Pete Zaitcev <zaitcev@redhat.com>
Cc: schwidefsky@de.ibm.com, linux-arch@vger.kernel.org,
akpm@osdl.org, jakub@redhat.com
Subject: Re: FUTEX_CMP_REQUEUE and 6-argument syscall
Date: Thu, 3 Jun 2004 20:13:45 +0200 [thread overview]
Message-ID: <20040603181345.GA26083@linux-mips.org> (raw)
In-Reply-To: <20040603110221.1fe58b53.zaitcev@redhat.com>
On Thu, Jun 03, 2004 at 11:02:21AM -0700, Pete Zaitcev wrote:
> So, now we have a syscall with 6 arguments. Do you have any suggestions
> how to handle it on s390? The main decision would be if we stick to
> the C calling convention and put a pointer to the list into %r7, or
> if we just put the argument into %r7 (thus precluding syscalls with
> 7 arguments for sure, but saving a get_user somewhere). After that
> we need to change arch/s390/kernel/entry.S:trace_svc, and the 31 bit
> compat wrapper.
>
> I'm curious if any other architecture was caught out by this.
6 is the limit on o32 MIPS where we pass 4 arguments in registers and two
on the stack but it would be easy to extend that. On 64-bit kernels we
only use upto 8 register arguments but no stack arguments ever so I hope
we don't exceed that limit ever ...
Ralf
next prev parent reply other threads:[~2004-06-03 18:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-03 18:02 FUTEX_CMP_REQUEUE and 6-argument syscall Pete Zaitcev
2004-06-03 18:13 ` Ralf Baechle [this message]
2004-06-03 21:26 ` David S. Miller
2004-06-03 23:27 ` Pete Zaitcev
2004-06-04 0:33 ` Paul Mackerras
2004-06-04 7:44 ` Russell King
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20040603181345.GA26083@linux-mips.org \
--to=ralf@linux-mips.org \
--cc=akpm@osdl.org \
--cc=jakub@redhat.com \
--cc=linux-arch@vger.kernel.org \
--cc=schwidefsky@de.ibm.com \
--cc=zaitcev@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.