hw-breakpoints: Fix hardware breakpoints -> perf events dependency
authorFrederic Weisbecker <fweisbec@gmail.com>
Thu, 17 Dec 2009 00:33:54 +0000 (01:33 +0100)
committerIngo Molnar <mingo@elte.hu>
Fri, 18 Dec 2009 12:11:51 +0000 (13:11 +0100)
commit99e8c5a3b875a34d894a711c9a3669858d6adf45
treecb0feb7052857b9f32b476f9b4d793b8ff628974
parent5d27c23df09b702868d9a3bff86ec6abd22963ac
hw-breakpoints: Fix hardware breakpoints -> perf events dependency

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: Cyrill Gorcunov <gorcunov@gmail.com>
Reported-by: Michal Marek <mmarek@suse.cz>
Reported-by: Andrew Randrianasulu <randrik_a@yahoo.com>
Signed-off-by: Frederic 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: Ingo Molnar <mingo@elte.hu>
arch/Kconfig
arch/x86/Kconfig