• F
    hw-breakpoints: Fix hardware breakpoints -> perf events dependency · 99e8c5a3
    Frederic Weisbecker 提交于
    The kbuild's select command doesn't propagate through the config
    dependencies.
    
    Hence the current rules of hardware breakpoint's config can't
    ensure perf can never be disabled under us.
    
    We have:
    
    config X86
    	selects HAVE_HW_BREAKPOINTS
    
    config HAVE_HW_BREAKPOINTS
    	select PERF_EVENTS
    
    config PERF_EVENTS
    	[...]
    
    x86 will select the breakpoints but that won't propagate to perf
    events. The user can still disable the latter, but it is
    necessary for the breakpoints.
    
    What we need is:
    
     - x86 selects HAVE_HW_BREAKPOINTS and PERF_EVENTS
     - HAVE_HW_BREAKPOINTS depends on PERF_EVENTS
    
    so that we ensure PERF_EVENTS is enabled and frozen for x86.
    
    This fixes the following kind of build errors:
    
     In file included from arch/x86/kernel/hw_breakpoint.c:31:
     include/linux/hw_breakpoint.h: In function 'hw_breakpoint_addr':
     include/linux/hw_breakpoint.h:39: error: 'struct perf_event' has no member named 'attr'
    
    v2: Select also ANON_INODES from x86, required for perf
    Reported-by: NCyrill Gorcunov <gorcunov@gmail.com>
    Reported-by: NMichal Marek <mmarek@suse.cz>
    Reported-by: NAndrew Randrianasulu <randrik_a@yahoo.com>
    Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Randy Dunlap <randy.dunlap@oracle.com>
    Cc: K.Prasad <prasad@linux.vnet.ibm.com>
    LKML-Reference: <1261010034-7786-1-git-send-regression-fweisbec@gmail.com>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    99e8c5a3
Kconfig 3.8 KB