powerpc/ptrace: Fix brk.len used uninitialised
authorMichael Neuling <mikey@neuling.org>
Mon, 11 Mar 2013 16:42:49 +0000 (16:42 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Sun, 17 Mar 2013 01:35:06 +0000 (12:35 +1100)
With some CONFIGS it's possible that in ppc_set_hwdebug, brk.len is
uninitialised before being used.  It has been reported that GCC 4.2 will
produce the following error in this case:

  arch/powerpc/kernel/ptrace.c:1479: warning: 'brk.len' is used uninitialized in this function
  arch/powerpc/kernel/ptrace.c:1381: note: 'brk.len' was declared here

This patch corrects this.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Reported-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/kernel/ptrace.c

index 245c1b6a08589d216d3389308c565668b720b597..f9b30c68ba473a7f51607936da0e124507f40362 100644 (file)
@@ -1428,6 +1428,7 @@ static long ppc_set_hwdebug(struct task_struct *child,
 
        brk.address = bp_info->addr & ~7UL;
        brk.type = HW_BRK_TYPE_TRANSLATE;
+       brk.len = 8;
        if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
                brk.type |= HW_BRK_TYPE_READ;
        if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)