Subject: [merged] sysrqrcu-suppress-rcu-stall-warnings-while-sysrq-runs.patch removed from -mm tree
To: riel@xxxxxxxxxx,cxie@xxxxxxxxxx,paulmck@xxxxxxxxxxxxxxxxxx,rdunlap@xxxxxxxxxxxxx,richard@xxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 09 Jun 2014 12:40:17 -0700
The patch titled
Subject: sysrq,rcu: suppress RCU stall warnings while sysrq runs
has been removed from the -mm tree. Its filename was
sysrqrcu-suppress-rcu-stall-warnings-while-sysrq-runs.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Rik van Riel <riel@xxxxxxxxxx>
Subject: sysrq,rcu: suppress RCU stall warnings while sysrq runs
Some sysrq handlers can run for a long time, because they dump a lot of
data onto a serial console. Having RCU stall warnings pop up in the
middle of them only makes the problem worse.
This patch temporarily disables RCU stall warnings while a sysrq request
is handled.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Suggested-by: Paul McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Madper Xie <cxie@xxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/tty/sysrq.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN drivers/tty/sysrq.c~sysrqrcu-suppress-rcu-stall-warnings-while-sysrq-runs drivers/tty/sysrq.c
--- a/drivers/tty/sysrq.c~sysrqrcu-suppress-rcu-stall-warnings-while-sysrq-runs
+++ a/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>
@@ -511,6 +512,7 @@ void __handle_sysrq(int key, bool check_
int orig_log_level;
int i;
+ rcu_sysrq_start();
rcu_read_lock();
/*
* Raise the apparent loglevel to maximum so that the sysrq header
@@ -554,6 +556,7 @@ void __handle_sysrq(int key, bool check_
console_loglevel = orig_log_level;
}
rcu_read_unlock();
+ rcu_sysrq_end();
}
void handle_sysrq(int key)
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
origin.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v2.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v3.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v3-fix.patch
pagewalk-update-page-table-walker-core.patch
pagewalk-add-walk_page_vma.patch
smaps-redefine-callback-functions-for-page-table-walker.patch
clear_refs-redefine-callback-functions-for-page-table-walker.patch
pagemap-redefine-callback-functions-for-page-table-walker.patch
numa_maps-redefine-callback-functions-for-page-table-walker.patch
memcg-redefine-callback-functions-for-page-table-walker.patch
arch-powerpc-mm-subpage-protc-use-walk_page_vma-instead-of-walk_page_range.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
cpu-hotplug-smp-flush-any-pending-ipi-callbacks-before-cpu-offline.patch
linux-next.patch
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