On Thu, 24 Apr 2014 15:40:29 -0700
Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
> uml on x86_64 defconfig:
>
> drivers/built-in.o: In function `__handle_sysrq':
> drivers/tty/sysrq.c:514: undefined reference to `rcu_sysrq_start'
> drivers/tty/sysrq.c:558: undefined reference to `rcu_sysrq_end'
Randy, does the patch below fix it?
Mike, this patch should also address your concerns.
Andrew, this can be a -fix patch for the sysctl-rcu patch,
assuming it fixes things :)
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx
---
drivers/tty/sysrq.c | 1 +
kernel/rcu/update.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index dd53af9..0867433 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -46,6 +46,7 @@
#include <linux/jiffies.h>
#include <linux/syscalls.h>
#include <linux/of.h>
+#include <linux/rcupdate.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 2ac3289..d22309c 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -322,7 +322,8 @@ int rcu_jiffies_till_stall_check(void)
void rcu_sysrq_start(void)
{
- rcu_cpu_stall_suppress = 2;
+ if (!rcu_cpu_stall_suppress)
+ rcu_cpu_stall_suppress = 2;
}
void rcu_sysrq_end(void)
--
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