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From: Steven Rostedt <rostedt@goodmis.org>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>,
	Rabin Vincent <rabin@rab.in>,
	linux-arm-kernel@lists.infradead.org,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tracing/syscalls: ignore numbers outside NR_syscalls' range
Date: Thu, 30 Oct 2014 07:30:28 -0400	[thread overview]
Message-ID: <20141030073028.284c468c@gandalf.local.home> (raw)
In-Reply-To: <20141030111441.GP27405@n2100.arm.linux.org.uk>

On Thu, 30 Oct 2014 11:14:41 +0000
Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:


> We have always had syscall number range of 0x900000 or so.  The tracing
> design does not expect that.  Therefore, the tracing design did not take
> account of ARM when it was created.  Therefore, it's up to the tracing
> people to decide how to properly fit their ill-designed subsystem into
> one of the popular and well-established kernel architectures - or at
> least suggest a way to work around this issue.
> 


Fine, lets define a MAX_SYSCALL_NR that is by default NR_syscalls, but
an architecture can override it.

In trace_syscalls.c, where the checks are done, have this:

#ifndef MAX_SYSCALL_NR
# define MAX_SYSCALL_NR NR_syscalls
#endif

change all the checks to test against MAX_SYSCALL_NR instead of
NR_syscalls.

Then in arch/arm/include/asm/syscall.h have:

#define MAX_SYSCALL_NR 0xa00000

or whatever would be the highest syscall number for ARM.

-- Steve

  reply	other threads:[~2014-10-30 11:30 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-29 22:06 [PATCH] tracing/syscalls: ignore numbers outside NR_syscalls' range Rabin Vincent
2014-10-30  8:26 ` Christoph Hellwig
2014-10-30 10:18   ` Russell King - ARM Linux
2014-10-30 11:10     ` Steven Rostedt
2014-10-30 11:14       ` Russell King - ARM Linux
2014-10-30 11:30         ` Steven Rostedt [this message]
2014-10-30 11:35           ` Russell King - ARM Linux
2014-11-03 17:08             ` Nathan Lynch
2014-11-03 17:58               ` Steven Rostedt
2014-10-30 11:52       ` Steven Rostedt
2014-10-30 11:55         ` Steven Rostedt
2014-10-31 10:01     ` Ingo Molnar

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