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tracing: Define NR_syscalls for x86_64 

Express the available number of syscalls in a standard way by defining
NR_syscalls.

The common way to define it is to place its definition in asm/unistd.h
However, the number of syscalls is defined using __NR_syscall_max in
x86-64 after building a dynamic header file "asm-offsets.h"

The source file that generates this header, asm-offsets-64.c includes
unistd.h, then if we want to express NR_syscalls from __NR_syscall_max
in unistd.h only after generating the dynamic header file, we need a
watchguard.

If unistd.h is included from asm-offsets-64.c, then we are generating
asm-offset.h which defines __NR_syscall_max. At this time, we don't
want to (we can't) define NR_syscalls, then we do nothing.
Otherwise we define NR_syscalls because we know asm-offsets.h has
been generated.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Josh Stone <jistone@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anwin <hpa@zytor.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
LKML-Reference: <20090826160910.GB2658@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Jason Baron 2009-08-26 12:09:10 -04:00 committed by Frederic Weisbecker
parent dd86dda24c
commit a5a2f8e2ac
2 changed files with 7 additions and 0 deletions
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6
arch/x86/include/asm/unistd_64.h
View File

@ -688,6 +688,12 @@ __SYSCALL(__NR_perf_counter_open, sys_perf_counter_open)
#endif /* __NO_STUBS */ #endif /* __NO_STUBS */
#ifdef __KERNEL__ #ifdef __KERNEL__
#ifndef COMPILE_OFFSETS
#include <asm/asm-offsets.h>
#define NR_syscalls (__NR_syscall_max + 1)
#endif
/* /*
* "Conditional" syscalls * "Conditional" syscalls
* *

1
arch/x86/kernel/asm-offsets_64.c
View File

@ -3,6 +3,7 @@
* This code generates raw asm output which is post-processed to extract * This code generates raw asm output which is post-processed to extract
* and format the required data. * and format the required data.
*/ */
#define COMPILE_OFFSETS
#include <linux/crypto.h> #include <linux/crypto.h>
#include <linux/sched.h> #include <linux/sched.h>