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arm64: use private ratelimit state along with show_unhandled_signals

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printk_ratelimit() shares the ratelimiting state with other callers what
may lead to scenarios where at the time we want to print out debug
information we already limited, so nothing appears in the dmesg - this
makes exception-trace quite poor helper in debugging.

Additionally, we have imbalance with some messages limited with global
ratelimit state and other messages limited with their private state
defined via pr_*_ratelimited().

To address this inconsistency show_unhandled_signals_ratelimited()
macro is introduced and caller sites are converted to use it.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Vladimir Murzin
2015-06-19 15:28:03 +01:00
committed by Catalin Marinas
parent 9e793ab84e
commit 86dca36e6b
3 changed files with 16 additions and 5 deletions
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3
arch/arm64/mm/fault.c
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@@ -115,8 +115,7 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
{
struct siginfo si;
if (show_unhandled_signals && unhandled_signal(tsk, sig) &&
printk_ratelimit()) {
if (show_unhandled_signals_ratelimited() && unhandled_signal(tsk, sig)) {
pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
tsk->comm, task_pid_nr(tsk), fault_name(esr), sig,
addr, esr);