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  • Ingo Molnar's avatar
    perf tools, x86: Build perf on older user-space as well · eae7a755
    Ingo Molnar authored
    On ancient systems I get this build failure:
    
      util/../../../arch/x86/include/asm/unistd.h:67:29: error: asm/unistd_64.h: No such file or directory
      In file included from util/cache.h:7,
                       from builtin-test.c:8:
      util/../perf.h: In function ‘sys_perf_event_open’:In file included from util/../perf.h:16
      perf.h:170: error: ‘__NR_perf_event_open’ undeclared (first use in this function)
    
    The reason is that this old system does not have the split
    unistd.h headers yet, from which to pick up the syscall
    definitions.
    
    Add the syscall numbers to the already existing i386 and x86_64
    blocks in perf.h, and also provide empty include file stubs.
    
    With this patch perf builds and works fine on 5 years old
    user-space as well.
    
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Link: http://lkml.kernel.org/n/tip-jctwg64le1w47tuaoeyftsg9@git.kernel.org
    
    
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    eae7a755