, it will try to hold the
logbuf_lock.
To avoid this deadlock, drop the num_online_cpus() check and call
the printk_safe_flush_on_panic() before panic_notifier_list callback,
attempt to re-init logbuf_lock from panic CPU.
Signed-off-by: Cheng Jian
---
kernel/panic.c | 3 +++
kernel
llsyms_lookup_name() and
kallsyms_on_each_symbol()") restricts the invocation for kernel unexported
symbols, but it is still incorrect to make the symbols of non-LIVE modules
visible to the outside.
Signed-off-by: Cheng Jian
---
kernel/module.c | 2 +-
1 file changed, 1 insertion(+), 1
remove it.
Fixes: ca8000684ec4 ("perf evsel: Enable ignore_missing_thread for pid option")
Signed-off-by: Cheng Jian
---
tools/perf/util/evsel.c | 8 ++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index eb
+0x204/0x238
Signed-off-by: Cheng Jian
---
kernel/trace/ftrace.c | 8
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index bd030b1b9514..cd39cbf3631a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2027,14
rq->nr_uninterruptible to atomic_t.
Signed-off-by: Cheng Jian
---
kernel/sched/core.c| 14 +-
kernel/sched/debug.c | 2 +-
kernel/sched/loadavg.c | 2 +-
kernel/sched/sched.h | 2 +-
4 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/kernel/sched/core.c b/
RPS is ~240K. We also measure the overhead of
eventpoll_release_file() and its children by perf: 29% before and
2% after.
Link : https://lkml.org/lkml/2017/10/28/81
Signed-off-by: Cheng Jian
Signed-off-by: Hou Tao
---
fs/eventpoll.c | 106 ++---
1 f
'
To fix this, just revert that commit.
Signed-off-by: Cheng Jian
---
arch/x86/kernel/module.c | 15 ---
1 file changed, 15 deletions(-)
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index d5c72cb..3eb23a8 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel
l/debug/tracing/enabled_functions
unshare_files (1) R I tramp:
0xc000(klp_ftrace_handler+0x0/0xa0)
->ftrace_ops_assist_func+0x0/0xf0
Signed-off-by: Cheng Jian
---
kernel/trace/ftrace.c | 28 +++-
1 file changed, 15 insertions(+), 13 deletions(-)
diff --
el0_svc_handler+0x50/0xa8
el0_svc+0x8/0xc
==
Cc: sta...@vger.kernel.org
Signed-off-by: Cheng Jian
---
kernel/sched/fair.c | 14 +++---
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/kernel/sched/fair.c b
1040 [002]36.536079: sched:sched_wakeup_new:
comm=test_fork pid=1041 prio=120 target_cpu=003
It will match it only once for tracing task(child-1041).
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
kernel/events/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel
1040 [002]36.536079: sched:sched_wakeup_new:
comm=test_fork pid=1041 prio=120 target_cpu=003
It will match it only once for tracing task(child-1041).
Signed-off-by: Cheng Jian
---
kernel/events/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/co
1 prio=120 target_cpu=003
bug_fork 1040 [002]36.536079: sched:sched_wakeup_new:
comm=bug_fork pid=1041 prio=120 target_cpu=003
match it twice, an match for tracing current(parent) and an match
for task(child).
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
kernel/events/
1 prio=120 target_cpu=003
bug_fork 1040 [002]36.536079: sched:sched_wakeup_new:
comm=bug_fork pid=1041 prio=120 target_cpu=003
match it twice, an match for tracing current(parent) and an match
for task(child).
Signed-off-by: Cheng Jian
---
kernel/events/core.c | 2 ++
1 file
003
match it twice, an match for tracing current(parent) and an match
for task(child).
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
kernel/events/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4df5b69..a199c03 100644
---
003
match it twice, an match for tracing current(parent) and an match
for task(child).
Signed-off-by: Cheng Jian
---
kernel/events/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4df5b69..a199c03 100644
--- a/kernel/events/core.c
+++ b/ker
fc fc fc fc
b732a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>b732a780: 00 00 00 00 07 fc fc fc fc fc fc fc fc fc fc fc
^
If data_size is invalid, then we should not register it.
Signed-off-by: Cheng Jian <cj.chengj...@huawe
fc fc fc fc
b732a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>b732a780: 00 00 00 00 07 fc fc fc fc fc fc fc fc fc fc fc
^
If data_size is invalid, then we should not register it.
Signed-off-by: Cheng Jian
Reported-by: Kong ZhangHuan
--
Commit-ID: a555e9d86ee384d9d3cb3310a57aed33f7e053d4
Gitweb: https://git.kernel.org/tip/a555e9d86ee384d9d3cb3310a57aed33f7e053d4
Author: Cheng Jian <cj.chengj...@huawei.com>
AuthorDate: Thu, 7 Dec 2017 21:30:43 +0800
Committer: Ingo Molnar <mi...@kernel.org>
CommitDate: Fri, 8
Commit-ID: a555e9d86ee384d9d3cb3310a57aed33f7e053d4
Gitweb: https://git.kernel.org/tip/a555e9d86ee384d9d3cb3310a57aed33f7e053d4
Author: Cheng Jian
AuthorDate: Thu, 7 Dec 2017 21:30:43 +0800
Committer: Ingo Molnar
CommitDate: Fri, 8 Dec 2017 07:51:53 +0100
sched/fair: Remove unused
The first parameter 'curr' in wakeup_gran is unnecessary now.
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
kernel/sched/fair.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4037e19..005e196 100644
--- a/
The first parameter 'curr' in wakeup_gran is unnecessary now.
Signed-off-by: Cheng Jian
---
kernel/sched/fair.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4037e19..005e196 100644
--- a/kernel/sched/fair.c
+++ b/kernel
goto retry */
//..
}
So
retry - => goto retry -=> retry -=> goto retry ...
Then dead loop here.
So use fault_in to avoid it, It will not enter the retry label
twice under this branch.
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
-
goto retry */
//..
}
So
retry - => goto retry -=> retry -=> goto retry ...
Then dead loop here.
So use fault_in to avoid it, It will not enter the retry label
twice under this branch.
Signed-off-by: Cheng Jian
---
kernel/futex.c | 9 +++-
Commit-ID: f791dd2589d7e217625d7e411621a5bac71cbf69
Gitweb: https://git.kernel.org/tip/f791dd2589d7e217625d7e411621a5bac71cbf69
Author: Cheng Jian <cj.chengj...@huawei.com>
AuthorDate: Fri, 3 Nov 2017 18:59:48 +0800
Committer: Ingo Molnar <mi...@kernel.org>
CommitDate: Tue, 7
Commit-ID: f791dd2589d7e217625d7e411621a5bac71cbf69
Gitweb: https://git.kernel.org/tip/f791dd2589d7e217625d7e411621a5bac71cbf69
Author: Cheng Jian
AuthorDate: Fri, 3 Nov 2017 18:59:48 +0800
Committer: Ingo Molnar
CommitDate: Tue, 7 Nov 2017 12:22:21 +0100
locking/rwlocks: Fix comments
'
warning: implicit conversion from enumeration type 'enum filter_cmp_type'
to different enumeration type 'enum filter_exp_type'
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
tools/lib/traceevent/parse-filter.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
'
warning: implicit conversion from enumeration type 'enum filter_cmp_type'
to different enumeration type 'enum filter_exp_type'
Signed-off-by: Cheng Jian
---
tools/lib/traceevent/parse-filter.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/lib/traceevent
plugin_xen.so
plugin_scsi.so plugin_cfg80211.so] or bad version of nm
So just use the LC_ALL=C (POSIX) default when sort.
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
tools/lib/traceevent/Makefile | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a
gin_scsi.so plugin_cfg80211.so] or bad version of nm
So just use the LC_ALL=C (POSIX) default when sort.
Signed-off-by: Cheng Jian
---
tools/lib/traceevent/Makefile | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/M
The kernel/locking/spinlock.c file contains the
implementations of spinlock and rwlock.
and __lock_function inlines are taken from other include
files. the comment miss rwlock_api_smp.h about rwlock.
also fix a little comment in rwlock_api_smp.h
Signed-off-by: Cheng Jian <cj.chengj...@huawei.
The kernel/locking/spinlock.c file contains the
implementations of spinlock and rwlock.
and __lock_function inlines are taken from other include
files. the comment miss rwlock_api_smp.h about rwlock.
also fix a little comment in rwlock_api_smp.h
Signed-off-by: Cheng Jian
---
include/linux
Commit-ID: 54b933c6c954a8b7b0c2b40a1c4d3f7279d11e22
Gitweb: https://git.kernel.org/tip/54b933c6c954a8b7b0c2b40a1c4d3f7279d11e22
Author: Cheng Jian <cj.chengj...@huawei.com>
AuthorDate: Wed, 25 Oct 2017 19:28:27 +0800
Committer: Ingo Molnar <mi...@kernel.org>
CommitDate: Thu,
Commit-ID: 54b933c6c954a8b7b0c2b40a1c4d3f7279d11e22
Gitweb: https://git.kernel.org/tip/54b933c6c954a8b7b0c2b40a1c4d3f7279d11e22
Author: Cheng Jian
AuthorDate: Wed, 25 Oct 2017 19:28:27 +0800
Committer: Ingo Molnar
CommitDate: Thu, 26 Oct 2017 08:31:29 +0200
sched/idle: Micro-optimize
st x0, x20
c90: 54000580b.eqd40 <do_idle+0x138>
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
kernel/sched/idle.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 257f4f0..41f16b8
c90: 54000580b.eqd40
Signed-off-by: Cheng Jian
---
kernel/sched/idle.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 257f4f0..41f16b8 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -209,6 +
ed-off-by: Cheng Jian <cj.chengj...@huawei.com>
Signed-off-by: Zhang MengTing <zhangmengt...@huawei.com>
---
tools/perf/builtin-sched.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 322b4de..47b79fc 100644
--- a/tools/pe
ed-off-by: Cheng Jian
Signed-off-by: Zhang MengTing
---
tools/perf/builtin-sched.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 322b4de..47b79fc 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -3248,7 +
only match an event event at a time,
so we will return after an event matched.
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
kernel/events/core.c | 14 ++
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index baa134c
only match an event event at a time,
so we will return after an event matched.
Signed-off-by: Cheng Jian
---
kernel/events/core.c | 14 ++
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index baa134c..5682ead 100644
--- a/ker
This patch convert pr_warning to standard pr_warn for arm64.
Signed-off-by: Cheng Jian <cj.chengj...@huawei.com>
---
arch/arm64/include/asm/syscall.h | 4 ++--
arch/arm64/kernel/hw_breakpoint.c | 8
arch/arm64/kernel/smp.c | 4 ++--
3 files changed, 8 insertions
This patch convert pr_warning to standard pr_warn for arm64.
Signed-off-by: Cheng Jian
---
arch/arm64/include/asm/syscall.h | 4 ++--
arch/arm64/kernel/hw_breakpoint.c | 8
arch/arm64/kernel/smp.c | 4 ++--
3 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch
Commit-ID: 18f08dae19990f5fffde92e3a63e0d90cda0f1a8
Gitweb: http://git.kernel.org/tip/18f08dae19990f5fffde92e3a63e0d90cda0f1a8
Author: Cheng Jian <cj.chengj...@huawei.com>
AuthorDate: Fri, 4 Aug 2017 17:19:37 +0800
Committer: Ingo Molnar <mi...@kernel.org>
CommitDate: Thu, 10
Commit-ID: 18f08dae19990f5fffde92e3a63e0d90cda0f1a8
Gitweb: http://git.kernel.org/tip/18f08dae19990f5fffde92e3a63e0d90cda0f1a8
Author: Cheng Jian
AuthorDate: Fri, 4 Aug 2017 17:19:37 +0800
Committer: Ingo Molnar
CommitDate: Thu, 10 Aug 2017 12:18:18 +0200
sched/core: Remove
ple scheduling class:
*/
idle->sched_class = _sched_class;
We've already set the boot thread to idle class in
start_kernel()->sched_init()->init_idle()
so it's unnecessary to set it again in
start_kernel()->rest_init()->init_idle_bootup_task()
Signed-off-by: Cheng Jian <cj
ple scheduling class:
*/
idle->sched_class = _sched_class;
We've already set the boot thread to idle class in
start_kernel()->sched_init()->init_idle()
so it's unnecessary to set it again in
start_kernel()->rest_init()->init_idle_bootup_task()
Signed-off-by: Cheng Jian
Signed
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