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* [PATCH] riscv: fix oops caused by irq on/off tracer
@ 2022-01-28 15:29 ` Changbin Du
  0 siblings, 0 replies; 5+ messages in thread
From: Changbin Du @ 2022-01-28 15:29 UTC (permalink / raw)
  To: Paul Walmsley, Palmer Dabbelt, Albert Ou
  Cc: linux-riscv, linux-kernel, Changbin Du

The trace_hardirqs_on/off requires at least two parent call frames.
If not, the code generated by CALLER_ADDR1 (aka. ftrace_return_address(1))
could trigger memory access fault.

[    0.039615][    T0] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000f8
[    0.041925][    T0] Oops [#1]
[    0.042063][    T0] Modules linked in:
[    0.042864][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.0-rc1-00233-g9a20c48d1ed2 #29
[    0.043568][    T0] Hardware name: riscv-virtio,qemu (DT)
[    0.044343][    T0] epc : trace_hardirqs_on+0x56/0xe2
[    0.044601][    T0]  ra : restore_all+0x12/0x6e
[    0.044721][    T0] epc : ffffffff80126a5c ra : ffffffff80003b94 sp : ffffffff81403db0
[    0.044801][    T0]  gp : ffffffff8163acd8 tp : ffffffff81414880 t0 : 0000000000000020
[    0.044882][    T0]  t1 : 0098968000000000 t2 : 0000000000000000 s0 : ffffffff81403de0
[    0.044967][    T0]  s1 : 0000000000000000 a0 : 0000000000000001 a1 : 0000000000000100
[    0.045046][    T0]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
[    0.045124][    T0]  a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000054494d45
[    0.045210][    T0]  s2 : ffffffff80003b94 s3 : ffffffff81a8f1b0 s4 : ffffffff80e27b50
[    0.045289][    T0]  s5 : ffffffff81414880 s6 : ffffffff8160fa00 s7 : 00000000800120e8
[    0.045389][    T0]  s8 : 0000000080013100 s9 : 000000000000007f s10: 0000000000000000
[    0.045474][    T0]  s11: 0000000000000000 t3 : 7fffffffffffffff t4 : 0000000000000000
[    0.045548][    T0]  t5 : 0000000000000000 t6 : ffffffff814aa368
[    0.045620][    T0] status: 0000000200000100 badaddr: 00000000000000f8 cause: 000000000000000d
[    0.046402][    T0] [<ffffffff80003b94>] restore_all+0x12/0x6e

To fix above issue, here we add one extra level wrapper so they can be
safely called by low level entry code.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
 arch/riscv/kernel/Makefile    |  2 ++
 arch/riscv/kernel/entry.S     | 10 +++++-----
 arch/riscv/kernel/trace_irq.c | 24 ++++++++++++++++++++++++
 3 files changed, 31 insertions(+), 5 deletions(-)
 create mode 100644 arch/riscv/kernel/trace_irq.c

diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 612556faa527..ffc87e76b1dd 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -51,6 +51,8 @@ obj-$(CONFIG_MODULE_SECTIONS)	+= module-sections.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= mcount-dyn.o
 
+obj-$(CONFIG_TRACE_IRQFLAGS)	+= trace_irq.o
+
 obj-$(CONFIG_RISCV_BASE_PMU)	+= perf_event.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_callchain.o
 obj-$(CONFIG_HAVE_PERF_REGS)	+= perf_regs.o
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index ed29e9c8f660..d6a46ed0bf05 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -108,7 +108,7 @@ _save_context:
 .option pop
 
 #ifdef CONFIG_TRACE_IRQFLAGS
-	call trace_hardirqs_off
+	call __trace_hardirqs_off
 #endif
 
 #ifdef CONFIG_CONTEXT_TRACKING
@@ -143,7 +143,7 @@ skip_context_tracking:
 	li t0, EXC_BREAKPOINT
 	beq s4, t0, 1f
 #ifdef CONFIG_TRACE_IRQFLAGS
-	call trace_hardirqs_on
+	call __trace_hardirqs_on
 #endif
 	csrs CSR_STATUS, SR_IE
 
@@ -234,7 +234,7 @@ ret_from_exception:
 	REG_L s0, PT_STATUS(sp)
 	csrc CSR_STATUS, SR_IE
 #ifdef CONFIG_TRACE_IRQFLAGS
-	call trace_hardirqs_off
+	call __trace_hardirqs_off
 #endif
 #ifdef CONFIG_RISCV_M_MODE
 	/* the MPP value is too large to be used as an immediate arg for addi */
@@ -270,10 +270,10 @@ restore_all:
 	REG_L s1, PT_STATUS(sp)
 	andi t0, s1, SR_PIE
 	beqz t0, 1f
-	call trace_hardirqs_on
+	call __trace_hardirqs_on
 	j 2f
 1:
-	call trace_hardirqs_off
+	call __trace_hardirqs_off
 2:
 #endif
 	REG_L a0, PT_STATUS(sp)
diff --git a/arch/riscv/kernel/trace_irq.c b/arch/riscv/kernel/trace_irq.c
new file mode 100644
index 000000000000..090fd82064e3
--- /dev/null
+++ b/arch/riscv/kernel/trace_irq.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Changbin Du <changbin.du@gmail.com>
+ */
+
+#include <linux/irqflags.h>
+#include <linux/kprobes.h>
+
+/**
+ * trace_hardirqs_on/off requires at least two parent call frames. Here we add
+ * one extra level so they can be safely called by low level entry code.
+ */
+
+void __trace_hardirqs_on(void)
+{
+	trace_hardirqs_on();
+}
+NOKPROBE_SYMBOL(__trace_hardirqs_on);
+
+void __trace_hardirqs_off(void)
+{
+	trace_hardirqs_off();
+}
+NOKPROBE_SYMBOL(__trace_hardirqs_off);
-- 
2.32.0


^ permalink raw reply related	[flat|nested] 5+ messages in thread
* [PATCH] riscv: fix oops caused by irq on/off tracer
@ 2022-01-28 15:29 ` Changbin Du
  0 siblings, 0 replies; 5+ messages in thread
From: Changbin Du @ 2022-01-28 15:29 UTC (permalink / raw)
  To: Paul Walmsley, Palmer Dabbelt, Albert Ou
  Cc: linux-riscv, linux-kernel, Changbin Du

The trace_hardirqs_on/off requires at least two parent call frames.
If not, the code generated by CALLER_ADDR1 (aka. ftrace_return_address(1))
could trigger memory access fault.

[    0.039615][    T0] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000f8
[    0.041925][    T0] Oops [#1]
[    0.042063][    T0] Modules linked in:
[    0.042864][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.0-rc1-00233-g9a20c48d1ed2 #29
[    0.043568][    T0] Hardware name: riscv-virtio,qemu (DT)
[    0.044343][    T0] epc : trace_hardirqs_on+0x56/0xe2
[    0.044601][    T0]  ra : restore_all+0x12/0x6e
[    0.044721][    T0] epc : ffffffff80126a5c ra : ffffffff80003b94 sp : ffffffff81403db0
[    0.044801][    T0]  gp : ffffffff8163acd8 tp : ffffffff81414880 t0 : 0000000000000020
[    0.044882][    T0]  t1 : 0098968000000000 t2 : 0000000000000000 s0 : ffffffff81403de0
[    0.044967][    T0]  s1 : 0000000000000000 a0 : 0000000000000001 a1 : 0000000000000100
[    0.045046][    T0]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
[    0.045124][    T0]  a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000054494d45
[    0.045210][    T0]  s2 : ffffffff80003b94 s3 : ffffffff81a8f1b0 s4 : ffffffff80e27b50
[    0.045289][    T0]  s5 : ffffffff81414880 s6 : ffffffff8160fa00 s7 : 00000000800120e8
[    0.045389][    T0]  s8 : 0000000080013100 s9 : 000000000000007f s10: 0000000000000000
[    0.045474][    T0]  s11: 0000000000000000 t3 : 7fffffffffffffff t4 : 0000000000000000
[    0.045548][    T0]  t5 : 0000000000000000 t6 : ffffffff814aa368
[    0.045620][    T0] status: 0000000200000100 badaddr: 00000000000000f8 cause: 000000000000000d
[    0.046402][    T0] [<ffffffff80003b94>] restore_all+0x12/0x6e

To fix above issue, here we add one extra level wrapper so they can be
safely called by low level entry code.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
 arch/riscv/kernel/Makefile    |  2 ++
 arch/riscv/kernel/entry.S     | 10 +++++-----
 arch/riscv/kernel/trace_irq.c | 24 ++++++++++++++++++++++++
 3 files changed, 31 insertions(+), 5 deletions(-)
 create mode 100644 arch/riscv/kernel/trace_irq.c

diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 612556faa527..ffc87e76b1dd 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -51,6 +51,8 @@ obj-$(CONFIG_MODULE_SECTIONS)	+= module-sections.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= mcount-dyn.o
 
+obj-$(CONFIG_TRACE_IRQFLAGS)	+= trace_irq.o
+
 obj-$(CONFIG_RISCV_BASE_PMU)	+= perf_event.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_callchain.o
 obj-$(CONFIG_HAVE_PERF_REGS)	+= perf_regs.o
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index ed29e9c8f660..d6a46ed0bf05 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -108,7 +108,7 @@ _save_context:
 .option pop
 
 #ifdef CONFIG_TRACE_IRQFLAGS
-	call trace_hardirqs_off
+	call __trace_hardirqs_off
 #endif
 
 #ifdef CONFIG_CONTEXT_TRACKING
@@ -143,7 +143,7 @@ skip_context_tracking:
 	li t0, EXC_BREAKPOINT
 	beq s4, t0, 1f
 #ifdef CONFIG_TRACE_IRQFLAGS
-	call trace_hardirqs_on
+	call __trace_hardirqs_on
 #endif
 	csrs CSR_STATUS, SR_IE
 
@@ -234,7 +234,7 @@ ret_from_exception:
 	REG_L s0, PT_STATUS(sp)
 	csrc CSR_STATUS, SR_IE
 #ifdef CONFIG_TRACE_IRQFLAGS
-	call trace_hardirqs_off
+	call __trace_hardirqs_off
 #endif
 #ifdef CONFIG_RISCV_M_MODE
 	/* the MPP value is too large to be used as an immediate arg for addi */
@@ -270,10 +270,10 @@ restore_all:
 	REG_L s1, PT_STATUS(sp)
 	andi t0, s1, SR_PIE
 	beqz t0, 1f
-	call trace_hardirqs_on
+	call __trace_hardirqs_on
 	j 2f
 1:
-	call trace_hardirqs_off
+	call __trace_hardirqs_off
 2:
 #endif
 	REG_L a0, PT_STATUS(sp)
diff --git a/arch/riscv/kernel/trace_irq.c b/arch/riscv/kernel/trace_irq.c
new file mode 100644
index 000000000000..090fd82064e3
--- /dev/null
+++ b/arch/riscv/kernel/trace_irq.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Changbin Du <changbin.du@gmail.com>
+ */
+
+#include <linux/irqflags.h>
+#include <linux/kprobes.h>
+
+/**
+ * trace_hardirqs_on/off requires at least two parent call frames. Here we add
+ * one extra level so they can be safely called by low level entry code.
+ */
+
+void __trace_hardirqs_on(void)
+{
+	trace_hardirqs_on();
+}
+NOKPROBE_SYMBOL(__trace_hardirqs_on);
+
+void __trace_hardirqs_off(void)
+{
+	trace_hardirqs_off();
+}
+NOKPROBE_SYMBOL(__trace_hardirqs_off);
-- 
2.32.0


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [PATCH] riscv: fix oops caused by irq on/off tracer
  2022-01-28 15:29 ` Changbin Du
  (?)
@ 2022-01-28 21:03   ` kernel test robot
  -1 siblings, 0 replies; 5+ messages in thread
From: kernel test robot @ 2022-01-28 21:03 UTC (permalink / raw)
  To: Changbin Du, Paul Walmsley, Palmer Dabbelt, Albert Ou
  Cc: kbuild-all, linux-riscv, linux-kernel, Changbin Du

Hi Changbin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.17-rc1 next-20220128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 145d9b498fc827b79c1260b4caa29a8e59d4c2b9
config: riscv-buildonly-randconfig-r003-20220127 (https://download.01.org/0day-ci/archive/20220129/202201290448.aKF0qISQ-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/d3adbc803a5b4d49e649489eec980048266e2a72
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
        git checkout d3adbc803a5b4d49e649489eec980048266e2a72
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/trace_irq.c:14:6: warning: no previous prototype for '__trace_hardirqs_on' [-Wmissing-prototypes]
      14 | void __trace_hardirqs_on(void)
         |      ^~~~~~~~~~~~~~~~~~~
>> arch/riscv/kernel/trace_irq.c:20:6: warning: no previous prototype for '__trace_hardirqs_off' [-Wmissing-prototypes]
      20 | void __trace_hardirqs_off(void)
         |      ^~~~~~~~~~~~~~~~~~~~
--
>> arch/riscv/kernel/trace_irq.c:10: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * trace_hardirqs_on/off requires at least two parent call frames. Here we add


vim +/__trace_hardirqs_on +14 arch/riscv/kernel/trace_irq.c

     8	
     9	/**
  > 10	 * trace_hardirqs_on/off requires at least two parent call frames. Here we add
    11	 * one extra level so they can be safely called by low level entry code.
    12	 */
    13	
  > 14	void __trace_hardirqs_on(void)
    15	{
    16		trace_hardirqs_on();
    17	}
    18	NOKPROBE_SYMBOL(__trace_hardirqs_on);
    19	
  > 20	void __trace_hardirqs_off(void)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] riscv: fix oops caused by irq on/off tracer
@ 2022-01-28 21:03   ` kernel test robot
  0 siblings, 0 replies; 5+ messages in thread
From: kernel test robot @ 2022-01-28 21:03 UTC (permalink / raw)
  To: Changbin Du, Paul Walmsley, Palmer Dabbelt, Albert Ou
  Cc: kbuild-all, linux-riscv, linux-kernel, Changbin Du

Hi Changbin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.17-rc1 next-20220128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 145d9b498fc827b79c1260b4caa29a8e59d4c2b9
config: riscv-buildonly-randconfig-r003-20220127 (https://download.01.org/0day-ci/archive/20220129/202201290448.aKF0qISQ-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/d3adbc803a5b4d49e649489eec980048266e2a72
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
        git checkout d3adbc803a5b4d49e649489eec980048266e2a72
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/trace_irq.c:14:6: warning: no previous prototype for '__trace_hardirqs_on' [-Wmissing-prototypes]
      14 | void __trace_hardirqs_on(void)
         |      ^~~~~~~~~~~~~~~~~~~
>> arch/riscv/kernel/trace_irq.c:20:6: warning: no previous prototype for '__trace_hardirqs_off' [-Wmissing-prototypes]
      20 | void __trace_hardirqs_off(void)
         |      ^~~~~~~~~~~~~~~~~~~~
--
>> arch/riscv/kernel/trace_irq.c:10: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * trace_hardirqs_on/off requires at least two parent call frames. Here we add


vim +/__trace_hardirqs_on +14 arch/riscv/kernel/trace_irq.c

     8	
     9	/**
  > 10	 * trace_hardirqs_on/off requires at least two parent call frames. Here we add
    11	 * one extra level so they can be safely called by low level entry code.
    12	 */
    13	
  > 14	void __trace_hardirqs_on(void)
    15	{
    16		trace_hardirqs_on();
    17	}
    18	NOKPROBE_SYMBOL(__trace_hardirqs_on);
    19	
  > 20	void __trace_hardirqs_off(void)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] riscv: fix oops caused by irq on/off tracer
@ 2022-01-28 21:03   ` kernel test robot
  0 siblings, 0 replies; 5+ messages in thread
From: kernel test robot @ 2022-01-28 21:03 UTC (permalink / raw)
  To: kbuild-all

[-- Attachment #1: Type: text/plain, Size: 2893 bytes --]

Hi Changbin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.17-rc1 next-20220128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 145d9b498fc827b79c1260b4caa29a8e59d4c2b9
config: riscv-buildonly-randconfig-r003-20220127 (https://download.01.org/0day-ci/archive/20220129/202201290448.aKF0qISQ-lkp(a)intel.com/config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/d3adbc803a5b4d49e649489eec980048266e2a72
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
        git checkout d3adbc803a5b4d49e649489eec980048266e2a72
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/trace_irq.c:14:6: warning: no previous prototype for '__trace_hardirqs_on' [-Wmissing-prototypes]
      14 | void __trace_hardirqs_on(void)
         |      ^~~~~~~~~~~~~~~~~~~
>> arch/riscv/kernel/trace_irq.c:20:6: warning: no previous prototype for '__trace_hardirqs_off' [-Wmissing-prototypes]
      20 | void __trace_hardirqs_off(void)
         |      ^~~~~~~~~~~~~~~~~~~~
--
>> arch/riscv/kernel/trace_irq.c:10: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * trace_hardirqs_on/off requires at least two parent call frames. Here we add


vim +/__trace_hardirqs_on +14 arch/riscv/kernel/trace_irq.c

     8	
     9	/**
  > 10	 * trace_hardirqs_on/off requires at least two parent call frames. Here we add
    11	 * one extra level so they can be safely called by low level entry code.
    12	 */
    13	
  > 14	void __trace_hardirqs_on(void)
    15	{
    16		trace_hardirqs_on();
    17	}
    18	NOKPROBE_SYMBOL(__trace_hardirqs_on);
    19	
  > 20	void __trace_hardirqs_off(void)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-01-28 21:04 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-01-28 15:29 [PATCH] riscv: fix oops caused by irq on/off tracer Changbin Du
2022-01-28 15:29 ` Changbin Du
2022-01-28 21:03 ` kernel test robot
2022-01-28 21:03   ` kernel test robot
2022-01-28 21:03   ` kernel test robot

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