linux-kernel - [PATCH 1/4] asm-generic: syscall_get

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Date:	Tue, 22 Sep 2009 23:19:49 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	jan.kratochvil@...hat.com, Oleg Nesterov <oleg@...hat.com>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 1/4] asm-generic: syscall_get_nr returns int

Only 32 bits of system call number are meaningful, so make the
specification for syscall_get_nr() be to return int, not long.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 include/asm-generic/syscall.h |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/syscall.h b/include/asm-generic/syscall.h
index ea8087b..5c122ae 100644
--- a/include/asm-generic/syscall.h
+++ b/include/asm-generic/syscall.h
@@ -1,7 +1,7 @@
 /*
  * Access to user system call parameters and results
  *
- * Copyright (C) 2008 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -32,9 +32,13 @@ struct pt_regs;
  * If @task is not executing a system call, i.e. it's blocked
  * inside the kernel for a fault or signal, returns -1.
  *
+ * Note this returns int even on 64-bit machines.  Only 32 bits of
+ * system call number can be meaningful.  If the actual arch value
+ * is 64 bits, this truncates to 32 bits so 0xffffffff means -1.
+ *
  * It's only valid to call this when @task is known to be blocked.
  */
-long syscall_get_nr(struct task_struct *task, struct pt_regs *regs);
+int syscall_get_nr(struct task_struct *task, struct pt_regs *regs);
 
 /**
  * syscall_rollback - roll back registers after an aborted system call
--
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