Use outer_disable/resume for suspend/resume.
With the two APIs used, code could be simplified and easy to extend
to introduce l2c_write_sec for i.MX platforms when moving Linux Kernel
runs in non-secure world.
Signed-off-by: Peng Fan <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Russell King <[email protected]>
Cc: Dong Aisheng <[email protected]>
---
V2:
Fix 6SX booting. The V1 patch does not take 6SX low power idle into
consideration.
Tested on 6Q-SDB and 6SX-SDB.
arch/arm/mach-imx/cpuidle-imx6sx.c | 2 ++
arch/arm/mach-imx/pm-imx6.c | 2 ++
arch/arm/mach-imx/suspend-imx6.S | 24 ------------------------
3 files changed, 4 insertions(+), 24 deletions(-)
diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c
index c5a5c3a70ab1..b35841d133dc 100644
--- a/arch/arm/mach-imx/cpuidle-imx6sx.c
+++ b/arch/arm/mach-imx/cpuidle-imx6sx.c
@@ -49,7 +49,9 @@ static int imx6sx_enter_wait(struct cpuidle_device *dev,
cpu_pm_enter();
cpu_cluster_pm_enter();
+ outer_disable();
cpu_suspend(0, imx6sx_idle_finish);
+ outer_resume();
cpu_cluster_pm_exit();
cpu_pm_exit();
diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
index ecdf071653d4..153a0afc7645 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -392,8 +392,10 @@ static int imx6q_pm_enter(suspend_state_t state)
imx6_enable_rbc(true);
imx_gpc_pre_suspend(true);
imx_anatop_pre_suspend();
+ outer_disable();
/* Zzz ... */
cpu_suspend(0, imx6q_suspend_finish);
+ outer_resume();
if (cpu_is_imx6q() || cpu_is_imx6dl())
imx_smp_prepare();
imx_anatop_post_resume();
diff --git a/arch/arm/mach-imx/suspend-imx6.S b/arch/arm/mach-imx/suspend-imx6.S
index 76ee2ceec8d5..324f6b165e82 100644
--- a/arch/arm/mach-imx/suspend-imx6.S
+++ b/arch/arm/mach-imx/suspend-imx6.S
@@ -74,24 +74,6 @@
.align 3
- .macro sync_l2_cache
-
- /* sync L2 cache to drain L2's buffers to DRAM. */
-#ifdef CONFIG_CACHE_L2X0
- ldr r11, [r0, #PM_INFO_MX6Q_L2_V_OFFSET]
- teq r11, #0
- beq 6f
- mov r6, #0x0
- str r6, [r11, #L2X0_CACHE_SYNC]
-1:
- ldr r6, [r11, #L2X0_CACHE_SYNC]
- ands r6, r6, #0x1
- bne 1b
-6:
-#endif
-
- .endm
-
.macro resume_mmdc
/* restore MMDC IO */
@@ -185,9 +167,6 @@ ENTRY(imx6_suspend)
str r9, [r11, #MX6Q_SRC_GPR1]
str r1, [r11, #MX6Q_SRC_GPR2]
- /* need to sync L2 cache before DSM. */
- sync_l2_cache
-
ldr r11, [r0, #PM_INFO_MX6Q_MMDC_V_OFFSET]
/*
* put DDR explicitly into self-refresh and
@@ -342,8 +321,5 @@ ENDPROC(imx6_suspend)
ENTRY(v7_cpu_resume)
bl v7_invalidate_l1
-#ifdef CONFIG_CACHE_L2X0
- bl l2c310_early_resume
-#endif
b cpu_resume
ENDPROC(v7_cpu_resume)
--
2.14.1
On Wed, Dec 27, 2017 at 09:57:47AM +0800, Peng Fan wrote:
> Use outer_disable/resume for suspend/resume.
> With the two APIs used, code could be simplified and easy to extend
> to introduce l2c_write_sec for i.MX platforms when moving Linux Kernel
> runs in non-secure world.
>
> Signed-off-by: Peng Fan <[email protected]>
> Cc: Shawn Guo <[email protected]>
> Cc: Sascha Hauer <[email protected]>
> Cc: Fabio Estevam <[email protected]>
> Cc: Russell King <[email protected]>
> Cc: Dong Aisheng <[email protected]>
@Aisheng, can you please give it a test?
Shawn
> -----Original Message-----
> From: Shawn Guo [mailto:[email protected]]
> Sent: Wednesday, December 27, 2017 10:32 AM
> To: Peng Fan <[email protected]>
> Cc: A.s. Dong <[email protected]>; [email protected]; Russell
> King <[email protected]>; Fabio Estevam <[email protected]>;
> Sascha Hauer <[email protected]>; [email protected]; linux-arm-
> [email protected]
> Subject: Re: [PATCH V2] ARM: imx: suspend/resume: use
> outer_disable/resume
>
> On Wed, Dec 27, 2017 at 09:57:47AM +0800, Peng Fan wrote:
> > Use outer_disable/resume for suspend/resume.
> > With the two APIs used, code could be simplified and easy to extend to
> > introduce l2c_write_sec for i.MX platforms when moving Linux Kernel
> > runs in non-secure world.
> >
> > Signed-off-by: Peng Fan <[email protected]>
> > Cc: Shawn Guo <[email protected]>
> > Cc: Sascha Hauer <[email protected]>
> > Cc: Fabio Estevam <[email protected]>
> > Cc: Russell King <[email protected]>
> > Cc: Dong Aisheng <[email protected]>
>
> @Aisheng, can you please give it a test?
>
Yes, of course.
Regards
Dong Aisheng
> Shawn
On Wed, Dec 27, 2017 at 02:33:57AM +0000, A.s. Dong wrote:
> > -----Original Message-----
> > From: Shawn Guo [mailto:[email protected]]
> > Sent: Wednesday, December 27, 2017 10:32 AM
> > To: Peng Fan <[email protected]>
> > Cc: A.s. Dong <[email protected]>; [email protected]; Russell
> > King <[email protected]>; Fabio Estevam <[email protected]>;
> > Sascha Hauer <[email protected]>; [email protected]; linux-arm-
> > [email protected]
> > Subject: Re: [PATCH V2] ARM: imx: suspend/resume: use
> > outer_disable/resume
> >
> > On Wed, Dec 27, 2017 at 09:57:47AM +0800, Peng Fan wrote:
> > > Use outer_disable/resume for suspend/resume.
> > > With the two APIs used, code could be simplified and easy to extend to
> > > introduce l2c_write_sec for i.MX platforms when moving Linux Kernel
> > > runs in non-secure world.
> > >
> > > Signed-off-by: Peng Fan <[email protected]>
> > > Cc: Shawn Guo <[email protected]>
> > > Cc: Sascha Hauer <[email protected]>
> > > Cc: Fabio Estevam <[email protected]>
> > > Cc: Russell King <[email protected]>
> > > Cc: Dong Aisheng <[email protected]>
> >
> > @Aisheng, can you please give it a test?
> >
>
> Yes, of course.
>
Not sure but i can still meet booting crash on mx6sx sdb.
Peng, you did not meet it, right?
I tested with Shanw/for-next branch.
[ 4.840665] VFS: Mounted root (nfs filesystem) readonly on device 0:13.
[ 4.853448] devtmpfs: mounted
[ 4.858370] Freeing unused kernel memory: 1024K
INIT: version 2.88 booting
[ 6.835667] BUG: Bad rss-counter state mm:ecef66c0 idx:0 val:-1
[ 6.841783] BUG: Bad rss-counter state mm:ecef66c0 idx:1 val:1
Starting udev
[ 7.792090] Unable to handle kernel NULL pointer dereference at virtual address 00000001
[ 7.800500] pgd = ecbcc000
[ 7.803884] [00000001] *pgd=ba0c1831
[ 7.807541] Internal error: Oops: 17 [#1] SMP ARM
[ 7.812268] Modules linked in:
[ 7.815368] CPU: 0 PID: 175 Comm: S04udev Not tainted 4.15.0-rc1-00043-g7afb5ac-dirty #1891
[ 7.823739] Hardware name: Freescale i.MX6 SoloX (Device Tree)
[ 7.829595] task: ec79d940 task.stack: ec8bc000
[ 7.834168] PC is at kmem_cache_alloc+0xf0/0x168
[ 7.838808] LR is at 0x2e85d000
[ 7.841971] pc : [<c0226ec0>] lr : [<2e85d000>] psr: 20000013
[ 7.848257] sp : ec8bdef8 ip : ef7d9ee0 fp : ec8bdf2c
[ 7.853502] r10: 00000b5e r9 : 00000001 r8 : a0000013
[ 7.858748] r7 : 00000b5f r6 : c014a21c r5 : 014000c0 r4 : ec001d80
[ 7.865295] r3 : 00000000 r2 : eca5b200 r1 : ec8bc000 r0 : c1009290
[ 7.871848] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 7.879003] Control: 10c5387d Table: acbcc04a DAC: 00000051
[ 7.884770] Process S04udev (pid: 175, stack limit = 0xec8bc210)
[ 7.890798] Stack: (0xec8bdef8 to 0xec8be000)
[ 7.895180] dee0: 00422030 00000000
[ 7.903387] df00: 000000c3 00000004 ec79d940 ffffff9c 0178f780 c0108104 ec8bc000 00000000
[ 7.911592] df20: ec8bdf44 ec8bdf30 c014a21c c0226ddc 00000004 00000000 ec8bdf94 ec8bdf48
[ 7.919798] df40: c022bf2c c014a1fc 00422030 00000000 0000000d 00000004 000003e8 000003e8
[ 7.928004] df60: 0000a990 00000000 5a41ff5b 00000004 00000000 0178f780 00000021 c0108104
[ 7.936209] df80: ec8bc000 00000000 ec8bdfa4 ec8bdf98 c022c120 c022bf0c 00000000 ec8bdfa8
[ 7.944414] dfa0: c0107f40 c022c110 00000004 00000000 0178f780 00000004 be92eca8 00008000
[ 7.952619] dfc0: 00000004 00000000 0178f780 00000021 00000000 00000000 00000024 be92edac
[ 7.960826] dfe0: 000e51e4 be92eca4 b6eac97c b6eac87c 60000010 0178f780 00000000 00000000
[ 7.969018] Backtrace:
[ 7.971519] [<c0226dd0>] (kmem_cache_alloc) from [<c014a21c>] (prepare_creds+0x2c/0x120)
[ 7.979642] r10:00000000 r9:ec8bc000 r8:c0108104 r7:0178f780 r6:ffffff9c r5:ec79d940
[ 7.987492] r4:00000004
[ 7.990060] [<c014a1f0>] (prepare_creds) from [<c022bf2c>] (SyS_faccessat+0x2c/0x204)
[ 7.997911] r5:00000000 r4:00000004
[ 8.001517] [<c022bf00>] (SyS_faccessat) from [<c022c120>] (SyS_access+0x1c/0x20)
[ 8.009028] r10:00000000 r9:ec8bc000 r8:c0108104 r7:00000021 r6:0178f780 r5:00000000
[ 8.016875] r4:00000004
[ 8.019448] [<c022c104>] (SyS_access) from [<c0107f40>] (ret_fast_syscall+0x0/0x28)
[ 8.027135] Code: e121f008 e3590000 0a000002 e5943014 (e7993003)
[ 8.033525] ---[ end trace 5829484d9a98b0fd ]---
/etc/init.d/rc: line 45: 175 Se[ 8.042776] Unable to handle kernel NULL pointer dereference at virtual address 00000001
Regards
Dong Aisheng
> Regards
> Dong Aisheng
>
> > Shawn
> -----Original Message-----
> From: Dong Aisheng [mailto:[email protected]]
> Sent: Wednesday, December 27, 2017 10:51 AM
> To: A.s. Dong <[email protected]>
> Cc: Shawn Guo <[email protected]>; Peng Fan <[email protected]>;
> [email protected]; Russell King <[email protected]>; Fabio
> Estevam <[email protected]>; Sascha Hauer <[email protected]>;
> [email protected]; [email protected]
> Subject: Re: [PATCH V2] ARM: imx: suspend/resume: use
> outer_disable/resume
>
> On Wed, Dec 27, 2017 at 02:33:57AM +0000, A.s. Dong wrote:
> > > -----Original Message-----
> > > From: Shawn Guo [mailto:[email protected]]
> > > Sent: Wednesday, December 27, 2017 10:32 AM
> > > To: Peng Fan <[email protected]>
> > > Cc: A.s. Dong <[email protected]>; [email protected];
> > > Russell King <[email protected]>; Fabio Estevam
> > > <[email protected]>; Sascha Hauer <[email protected]>;
> > > [email protected]; linux-arm- [email protected]
> > > Subject: Re: [PATCH V2] ARM: imx: suspend/resume: use
> > > outer_disable/resume
> > >
> > > On Wed, Dec 27, 2017 at 09:57:47AM +0800, Peng Fan wrote:
> > > > Use outer_disable/resume for suspend/resume.
> > > > With the two APIs used, code could be simplified and easy to
> > > > extend to introduce l2c_write_sec for i.MX platforms when moving
> > > > Linux Kernel runs in non-secure world.
> > > >
> > > > Signed-off-by: Peng Fan <[email protected]>
> > > > Cc: Shawn Guo <[email protected]>
> > > > Cc: Sascha Hauer <[email protected]>
> > > > Cc: Fabio Estevam <[email protected]>
> > > > Cc: Russell King <[email protected]>
> > > > Cc: Dong Aisheng <[email protected]>
> > >
> > > @Aisheng, can you please give it a test?
> > >
> >
> > Yes, of course.
> >
>
> Not sure but i can still meet booting crash on mx6sx sdb.
> Peng, you did not meet it, right?
>
> I tested with Shanw/for-next branch.
I use kernel master branch. I'll switch to shawn's for-next branch and give a test.
Thanks,
Peng.
>
> [ 4.840665] VFS: Mounted root (nfs filesystem) readonly on device 0:13.
> [ 4.853448] devtmpfs: mounted
> [ 4.858370] Freeing unused kernel memory: 1024K
> INIT: version 2.88 booting
> [ 6.835667] BUG: Bad rss-counter state mm:ecef66c0 idx:0 val:-1
> [ 6.841783] BUG: Bad rss-counter state mm:ecef66c0 idx:1 val:1
> Starting udev
> [ 7.792090] Unable to handle kernel NULL pointer dereference at virtual
> address 00000001
> [ 7.800500] pgd = ecbcc000
> [ 7.803884] [00000001] *pgd=ba0c1831
> [ 7.807541] Internal error: Oops: 17 [#1] SMP ARM
> [ 7.812268] Modules linked in:
> [ 7.815368] CPU: 0 PID: 175 Comm: S04udev Not tainted 4.15.0-rc1-00043-
> g7afb5ac-dirty #1891
> [ 7.823739] Hardware name: Freescale i.MX6 SoloX (Device Tree)
> [ 7.829595] task: ec79d940 task.stack: ec8bc000
> [ 7.834168] PC is at kmem_cache_alloc+0xf0/0x168
> [ 7.838808] LR is at 0x2e85d000
> [ 7.841971] pc : [<c0226ec0>] lr : [<2e85d000>] psr: 20000013
> [ 7.848257] sp : ec8bdef8 ip : ef7d9ee0 fp : ec8bdf2c
> [ 7.853502] r10: 00000b5e r9 : 00000001 r8 : a0000013
> [ 7.858748] r7 : 00000b5f r6 : c014a21c r5 : 014000c0 r4 : ec001d80
> [ 7.865295] r3 : 00000000 r2 : eca5b200 r1 : ec8bc000 r0 : c1009290
> [ 7.871848] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment
> none
> [ 7.879003] Control: 10c5387d Table: acbcc04a DAC: 00000051
> [ 7.884770] Process S04udev (pid: 175, stack limit = 0xec8bc210)
> [ 7.890798] Stack: (0xec8bdef8 to 0xec8be000)
> [ 7.895180] dee0: 00422030 00000000
> [ 7.903387] df00: 000000c3 00000004 ec79d940 ffffff9c 0178f780 c0108104
> ec8bc000 00000000
> [ 7.911592] df20: ec8bdf44 ec8bdf30 c014a21c c0226ddc 00000004 00000000
> ec8bdf94 ec8bdf48
> [ 7.919798] df40: c022bf2c c014a1fc 00422030 00000000 0000000d 00000004
> 000003e8 000003e8
> [ 7.928004] df60: 0000a990 00000000 5a41ff5b 00000004 00000000 0178f780
> 00000021 c0108104
> [ 7.936209] df80: ec8bc000 00000000 ec8bdfa4 ec8bdf98 c022c120 c022bf0c
> 00000000 ec8bdfa8
> [ 7.944414] dfa0: c0107f40 c022c110 00000004 00000000 0178f780 00000004
> be92eca8 00008000
> [ 7.952619] dfc0: 00000004 00000000 0178f780 00000021 00000000 00000000
> 00000024 be92edac
> [ 7.960826] dfe0: 000e51e4 be92eca4 b6eac97c b6eac87c 60000010 0178f780
> 00000000 00000000
> [ 7.969018] Backtrace:
> [ 7.971519] [<c0226dd0>] (kmem_cache_alloc) from [<c014a21c>]
> (prepare_creds+0x2c/0x120)
> [ 7.979642] r10:00000000 r9:ec8bc000 r8:c0108104 r7:0178f780 r6:ffffff9c
> r5:ec79d940
> [ 7.987492] r4:00000004
> [ 7.990060] [<c014a1f0>] (prepare_creds) from [<c022bf2c>]
> (SyS_faccessat+0x2c/0x204)
> [ 7.997911] r5:00000000 r4:00000004
> [ 8.001517] [<c022bf00>] (SyS_faccessat) from [<c022c120>]
> (SyS_access+0x1c/0x20)
> [ 8.009028] r10:00000000 r9:ec8bc000 r8:c0108104 r7:00000021 r6:0178f780
> r5:00000000
> [ 8.016875] r4:00000004
> [ 8.019448] [<c022c104>] (SyS_access) from [<c0107f40>]
> (ret_fast_syscall+0x0/0x28)
> [ 8.027135] Code: e121f008 e3590000 0a000002 e5943014 (e7993003)
> [ 8.033525] ---[ end trace 5829484d9a98b0fd ]---
> /etc/init.d/rc: line 45: 175 Se[ 8.042776] Unable to handle kernel NULL
> pointer dereference at virtual address 00000001
>
> Regards
> Dong Aisheng
>
> > Regards
> > Dong Aisheng
> >
> > > Shawn
> -----Original Message-----
> From: Dong Aisheng [mailto:[email protected]]
> Sent: Wednesday, December 27, 2017 10:51 AM
> To: A.s. Dong <[email protected]>
> Cc: Shawn Guo <[email protected]>; Peng Fan <[email protected]>;
> [email protected]; Russell King <[email protected]>; Fabio
> Estevam <[email protected]>; Sascha Hauer <[email protected]>;
> [email protected]; [email protected]
> Subject: Re: [PATCH V2] ARM: imx: suspend/resume: use
> outer_disable/resume
>
> On Wed, Dec 27, 2017 at 02:33:57AM +0000, A.s. Dong wrote:
> > > -----Original Message-----
> > > From: Shawn Guo [mailto:[email protected]]
> > > Sent: Wednesday, December 27, 2017 10:32 AM
> > > To: Peng Fan <[email protected]>
> > > Cc: A.s. Dong <[email protected]>; [email protected];
> > > Russell King <[email protected]>; Fabio Estevam
> > > <[email protected]>; Sascha Hauer <[email protected]>;
> > > [email protected]; linux-arm- [email protected]
> > > Subject: Re: [PATCH V2] ARM: imx: suspend/resume: use
> > > outer_disable/resume
> > >
> > > On Wed, Dec 27, 2017 at 09:57:47AM +0800, Peng Fan wrote:
> > > > Use outer_disable/resume for suspend/resume.
> > > > With the two APIs used, code could be simplified and easy to
> > > > extend to introduce l2c_write_sec for i.MX platforms when moving
> > > > Linux Kernel runs in non-secure world.
> > > >
> > > > Signed-off-by: Peng Fan <[email protected]>
> > > > Cc: Shawn Guo <[email protected]>
> > > > Cc: Sascha Hauer <[email protected]>
> > > > Cc: Fabio Estevam <[email protected]>
> > > > Cc: Russell King <[email protected]>
> > > > Cc: Dong Aisheng <[email protected]>
> > >
> > > @Aisheng, can you please give it a test?
> > >
> >
> > Yes, of course.
> >
>
> Not sure but i can still meet booting crash on mx6sx sdb.
> Peng, you did not meet it, right?
I could reproduce this issue using for-next imx_v6_v7_defconfig.
it is a bit strange that if "bl l2c310_early_resume "
is kept, it performs well. Actually outer_resume
will take care of L2 resume at a later stage. Need check more on this.
My previous setup is linus' master branch with multi_v7_defconfig with
SNVS RTC enabled, since I need to enable TEE.
Thanks,
Peng.
>
> I tested with Shanw/for-next branch.
>
> [ 4.840665] VFS: Mounted root (nfs filesystem) readonly on device 0:13.
> [ 4.853448] devtmpfs: mounted
> [ 4.858370] Freeing unused kernel memory: 1024K
> INIT: version 2.88 booting
> [ 6.835667] BUG: Bad rss-counter state mm:ecef66c0 idx:0 val:-1
> [ 6.841783] BUG: Bad rss-counter state mm:ecef66c0 idx:1 val:1
> Starting udev
> [ 7.792090] Unable to handle kernel NULL pointer dereference at virtual
> address 00000001
> [ 7.800500] pgd = ecbcc000
> [ 7.803884] [00000001] *pgd=ba0c1831
> [ 7.807541] Internal error: Oops: 17 [#1] SMP ARM
> [ 7.812268] Modules linked in:
> [ 7.815368] CPU: 0 PID: 175 Comm: S04udev Not tainted 4.15.0-rc1-00043-
> g7afb5ac-dirty #1891
> [ 7.823739] Hardware name: Freescale i.MX6 SoloX (Device Tree)
> [ 7.829595] task: ec79d940 task.stack: ec8bc000
> [ 7.834168] PC is at kmem_cache_alloc+0xf0/0x168
> [ 7.838808] LR is at 0x2e85d000
> [ 7.841971] pc : [<c0226ec0>] lr : [<2e85d000>] psr: 20000013
> [ 7.848257] sp : ec8bdef8 ip : ef7d9ee0 fp : ec8bdf2c
> [ 7.853502] r10: 00000b5e r9 : 00000001 r8 : a0000013
> [ 7.858748] r7 : 00000b5f r6 : c014a21c r5 : 014000c0 r4 : ec001d80
> [ 7.865295] r3 : 00000000 r2 : eca5b200 r1 : ec8bc000 r0 : c1009290
> [ 7.871848] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment
> none
> [ 7.879003] Control: 10c5387d Table: acbcc04a DAC: 00000051
> [ 7.884770] Process S04udev (pid: 175, stack limit = 0xec8bc210)
> [ 7.890798] Stack: (0xec8bdef8 to 0xec8be000)
> [ 7.895180] dee0: 00422030 00000000
> [ 7.903387] df00: 000000c3 00000004 ec79d940 ffffff9c 0178f780 c0108104
> ec8bc000 00000000
> [ 7.911592] df20: ec8bdf44 ec8bdf30 c014a21c c0226ddc 00000004 00000000
> ec8bdf94 ec8bdf48
> [ 7.919798] df40: c022bf2c c014a1fc 00422030 00000000 0000000d 00000004
> 000003e8 000003e8
> [ 7.928004] df60: 0000a990 00000000 5a41ff5b 00000004 00000000 0178f780
> 00000021 c0108104
> [ 7.936209] df80: ec8bc000 00000000 ec8bdfa4 ec8bdf98 c022c120 c022bf0c
> 00000000 ec8bdfa8
> [ 7.944414] dfa0: c0107f40 c022c110 00000004 00000000 0178f780 00000004
> be92eca8 00008000
> [ 7.952619] dfc0: 00000004 00000000 0178f780 00000021 00000000 00000000
> 00000024 be92edac
> [ 7.960826] dfe0: 000e51e4 be92eca4 b6eac97c b6eac87c 60000010 0178f780
> 00000000 00000000
> [ 7.969018] Backtrace:
> [ 7.971519] [<c0226dd0>] (kmem_cache_alloc) from [<c014a21c>]
> (prepare_creds+0x2c/0x120)
> [ 7.979642] r10:00000000 r9:ec8bc000 r8:c0108104 r7:0178f780 r6:ffffff9c
> r5:ec79d940
> [ 7.987492] r4:00000004
> [ 7.990060] [<c014a1f0>] (prepare_creds) from [<c022bf2c>]
> (SyS_faccessat+0x2c/0x204)
> [ 7.997911] r5:00000000 r4:00000004
> [ 8.001517] [<c022bf00>] (SyS_faccessat) from [<c022c120>]
> (SyS_access+0x1c/0x20)
> [ 8.009028] r10:00000000 r9:ec8bc000 r8:c0108104 r7:00000021 r6:0178f780
> r5:00000000
> [ 8.016875] r4:00000004
> [ 8.019448] [<c022c104>] (SyS_access) from [<c0107f40>]
> (ret_fast_syscall+0x0/0x28)
> [ 8.027135] Code: e121f008 e3590000 0a000002 e5943014 (e7993003)
> [ 8.033525] ---[ end trace 5829484d9a98b0fd ]---
> /etc/init.d/rc: line 45: 175 Se[ 8.042776] Unable to handle kernel NULL
> pointer dereference at virtual address 00000001
>
> Regards
> Dong Aisheng
>
> > Regards
> > Dong Aisheng
> >
> > > Shawn