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asm-generic: syscall_get_nr returns int

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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@redhat.com>
This commit is contained in:
Roland McGrath 2009-09-22 19:56:50 -07:00
parent 7fa07729e4
commit 268e46712d
1 changed files with 6 additions and 2 deletions
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8
include/asm-generic/syscall.h
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@ -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