From: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: "Alastair D'Silva" <alastair@d-silva.org>,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Balbir Singh <bsingharora@gmail.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Cyril Bur <cyrilbur@gmail.com>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Joe Perches <joe@perches.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Michael Neuling <mikey@neuling.org>,
Murilo Opsfelder Araujo <muriloo@linux.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Simon Guo <wei.guo.simon@gmail.com>,
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
"Tobin C . Harding" <me@tobin.cc>,
linuxppc-dev@lists.ozlabs.org,
Segher Boessenkool <segher@kernel.crashing.org>
Subject: [PATCH v4 2/6] powerpc/traps: Use an explicit ratelimit state for show_signal_msg()
Date: Wed, 1 Aug 2018 18:33:16 -0300 [thread overview]
Message-ID: <20180801213320.11203-3-muriloo@linux.ibm.com> (raw)
In-Reply-To: <20180801213320.11203-1-muriloo@linux.ibm.com>
Replace printk_ratelimited() by printk() and a default rate limit
burst to limit displaying unhandled signals messages.
This will allow us to call print_vma_addr() in a future patch, which
does not work with printk_ratelimited().
Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
---
arch/powerpc/kernel/traps.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index cbd3dc365193..367534b41617 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -301,6 +301,13 @@ void user_single_step_siginfo(struct task_struct *tsk,
info->si_addr = (void __user *)regs->nip;
}
+static bool show_unhandled_signals_ratelimited(void)
+{
+ static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
+ return show_unhandled_signals && __ratelimit(&rs);
+}
+
static void show_signal_msg(int signr, struct pt_regs *regs, int code,
unsigned long addr)
{
@@ -309,11 +316,15 @@ static void show_signal_msg(int signr, struct pt_regs *regs, int code,
const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \
"at %016lx nip %016lx lr %016lx code %x\n";
- if (show_unhandled_signals && unhandled_signal(current, signr)) {
- printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
- current->comm, current->pid, signr,
- addr, regs->nip, regs->link, code);
- }
+ if (!unhandled_signal(current, signr))
+ return;
+
+ if (!show_unhandled_signals_ratelimited())
+ return;
+
+ printk(regs->msr & MSR_64BIT ? fmt64 : fmt32,
+ current->comm, current->pid, signr,
+ addr, regs->nip, regs->link, code);
}
void _exception_pkey(int signr, struct pt_regs *regs, int code,
--
2.17.1
next prev parent reply other threads:[~2018-08-01 21:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-01 21:33 [PATCH v4 0/6] powerpc: Modernize unhandled signals message Murilo Opsfelder Araujo
2018-08-01 21:33 ` [PATCH v4 1/6] powerpc/traps: Print unhandled signals in a separate function Murilo Opsfelder Araujo
2018-08-08 14:26 ` [v4, " Michael Ellerman
2018-08-01 21:33 ` Murilo Opsfelder Araujo [this message]
2018-08-01 21:33 ` [PATCH v4 3/6] powerpc/traps: Use %lx format in show_signal_msg() Murilo Opsfelder Araujo
2018-08-01 21:33 ` [PATCH v4 4/6] powerpc/traps: Print VMA for unhandled signals Murilo Opsfelder Araujo
2018-08-01 21:33 ` [PATCH v4 5/6] powerpc: Add show_user_instructions() Murilo Opsfelder Araujo
2018-08-02 5:26 ` Christophe LEROY
2018-08-03 0:42 ` Murilo Opsfelder Araujo
2018-08-03 1:22 ` Joe Perches
2018-08-03 6:38 ` Christophe LEROY
2018-08-03 8:44 ` Michael Ellerman
2018-08-03 11:31 ` Murilo Opsfelder Araujo
2018-08-10 9:29 ` Christophe LEROY
2018-08-10 18:08 ` Murilo Opsfelder Araujo
2018-08-01 21:33 ` [PATCH v4 6/6] powerpc/traps: Show instructions on exceptions Murilo Opsfelder Araujo
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