• Jason Baron's avatar
    tracing: Define NR_syscalls for x86_64 · a5a2f8e2
    Jason Baron authored
    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: default avatarJason Baron <jbaron@redhat.com>
    Acked-by: default avatarSteven 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: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    a5a2f8e2
unistd_64.h 21.9 KB