lockdep: annotate kprobes irq fiddling
kprobes disables irqs for jprobes, but does not tell lockdep about it.
This resolves this warning during an allyesconfig bzImage bootup test:
[ 423.670337] WARNING: at kernel/lockdep.c:2658 check_flags()
[ 423.670341] [<c0107f01>] show_trace_log_lvl+0x19/0x2e
[ 423.670348] [<c0107ffa>] show_trace+0x12/0x14
[ 423.670350] [<c0108010>] dump_stack+0x14/0x16
[ 423.670353] [<c015249d>] check_flags+0x95/0x142
[ 423.670357] [<c0155576>] lock_acquire+0x52/0xb8
[ 423.670360] [<c1313c90>] _spin_lock+0x2e/0x58
[ 423.670365] [<c11b72f9>] jtcp_rcv_established+0x6e/0x189
[ 423.670369] [<c11810da>] tcp_v4_do_rcv+0x30b/0x620
[ 423.670373] [<c1181c8c>] tcp_v4_rcv+0x89d/0x8fa
[ 423.670376] [<c1167dba>] ip_local_deliver+0x17d/0x225
[ 423.670380] [<c11682f5>] ip_rcv+0x493/0x4ce
[ 423.670383] [<c11177ef>] netif_receive_skb+0x347/0x365
[ 423.670388] [<c07b6e7b>] nv_napi_poll+0x501/0x6c3
[ 423.670393] [<c1115b1a>] net_rx_action+0xa3/0x1b6
[ 423.670396] [<c013bdee>] __do_softirq+0x76/0xfb
[ 423.670400] [<c0109189>] do_softirq+0x75/0xf3
[ akpm: checkpatch.pl cleanups ]
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/arch/x86/kernel/kprobes_64.c b/arch/x86/kernel/kprobes_64.c
index 1df17a0..62e28e5 100644
--- a/arch/x86/kernel/kprobes_64.c
+++ b/arch/x86/kernel/kprobes_64.c
@@ -544,6 +544,12 @@
resume_execution(cur, regs, kcb);
regs->eflags |= kcb->kprobe_saved_rflags;
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+ if (raw_irqs_disabled_flags(regs->eflags))
+ trace_hardirqs_off();
+ else
+ trace_hardirqs_on();
+#endif
/* Restore the original saved kprobes variables and continue. */
if (kcb->kprobe_status == KPROBE_REENTER) {
@@ -684,6 +690,7 @@
memcpy(kcb->jprobes_stack, (kprobe_opcode_t *)addr,
MIN_STACK_SIZE(addr));
regs->eflags &= ~IF_MASK;
+ trace_hardirqs_off();
regs->rip = (unsigned long)(jp->entry);
return 1;
}