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authorRoland McGrath <roland@redhat.com>2009-09-22 19:56:50 -0700
committerRoland McGrath <roland@redhat.com>2009-09-22 19:56:50 -0700
commit268e46712d57a6493cc0f98e7d200a0f674c31ed (patch)
treeec5c12f5fa710646482fc822b6d7d635453dd3f4 /include/asm-generic/syscall.h
parent7fa07729e439a6184bd824746d06a49cca553f15 (diff)
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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@redhat.com>
Diffstat (limited to 'include/asm-generic/syscall.h')
-rw-r--r--include/asm-generic/syscall.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/asm-generic/syscall.h b/include/asm-generic/syscall.h
index ea8087b55ffc..5c122ae6bfa6 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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