| Message ID | 201106070316.41099.jkrzyszt@tis.icnet.pl (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
* Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> [110606 18:15]: > > Removing __initdata tags, introduced by commit > bdc58fb950a3a1b0bc3cbd8e23d21ecdde2ac9a2, "arm: omap1: fix a bunch of > section mismatches", from corresponding platform_device structures > declared in arch/arm/mach-omap1/board-ams-delta.c, corrects the problem > for me, which may indicate that their members (.name ?) are still > referred to during runtime so they shouldn't be freed after boot. Sounds like this needs a bit more research where this initdata gets used? Tony
On Tue, Jun 14, 2011 at 04:48:48AM -0700, Tony Lindgren wrote: > * Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> [110606 18:15]: > > > > Removing __initdata tags, introduced by commit > > bdc58fb950a3a1b0bc3cbd8e23d21ecdde2ac9a2, "arm: omap1: fix a bunch of > > section mismatches", from corresponding platform_device structures > > declared in arch/arm/mach-omap1/board-ams-delta.c, corrects the problem > > for me, which may indicate that their members (.name ?) are still > > referred to during runtime so they shouldn't be freed after boot. > > Sounds like this needs a bit more research where this initdata > gets used? to me it sounds like missing __init/__exit annotations on the driver. See ams-delta-leds for instance: static int ams_delta_led_probe(struct platform_device *pdev) static int ams_delta_led_remove(struct platform_device *pdev) which means those drivers will have probe sitting outside or .init.text and trying to reference name which sits in .init.text ??? Could that be the case here ? But it could also be that the platform_device shouldn't be marked __initdata.
On Tue 14 Jun 2011 at 14:00:00 Felipe Balbi wrote: > On Tue, Jun 14, 2011 at 04:48:48AM -0700, Tony Lindgren wrote: > > * Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> [110606 18:15]: > > > Removing __initdata tags, introduced by commit > > > bdc58fb950a3a1b0bc3cbd8e23d21ecdde2ac9a2, "arm: omap1: fix a > > > bunch of section mismatches", from corresponding platform_device > > > structures declared in arch/arm/mach-omap1/board-ams-delta.c, > > > corrects the problem for me, which may indicate that their > > > members (.name ?) are still referred to during runtime so they > > > shouldn't be freed after boot. > > > > Sounds like this needs a bit more research where this initdata > > gets used? Not that I didn't do any research before, now I think that not only platform_device.name is required. See below. > to me it sounds like missing __init/__exit annotations on the driver. > See ams-delta-leds for instance: > > static int ams_delta_led_probe(struct platform_device *pdev) > static int ams_delta_led_remove(struct platform_device *pdev) > > which means those drivers will have probe sitting outside or > .init.text and trying to reference name which sits in .init.text ??? > Could that be the case here ? Missing or not, addig them didn't help. > But it could also be that the platform_device shouldn't be marked > __initdata. After either reverting one of commits mentioned, or applying my patch, a read from /sys/devices/platform/ams-delta-led/uevent, for example, returns: DRIVER=ams-delta-led MODALIAS=platform:ams-delta-led The code responsible for returning these strings can be found in drivers/base/core.c: static int dev_uevent(struct kset *kset, struct kobject *kobj, struct kobj_uevent_env *env) { struct device *dev = to_dev(kobj); ... if (dev->driver) add_uevent_var(env, "DRIVER=%s", dev->driver->name); /* have the bus specific function add its stuff */ if (dev->bus && dev->bus->uevent) { retval = dev->bus->uevent(dev, env); ... The dev->bus->uevent for a platform device happens to sit in drivers/base/platform.c: static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) { struct platform_device *pdev = to_platform_device(dev); ... add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, (pdev->id_entry) ? pdev->id_entry->name : pdev->name); ... For me, it looks like struct kobject, pointed to by kobj, being a member of struct device, which in turn happens to be a member of struct platform_device. AFAICU, there exist two sorts of platform devices from memory allocation point of view: those created with platform_device_alloc(), which allocates a memory where struct platform_device is kept, and those created with platfrom_device_add(), which is provided with a pointer to an already allocated platform device structure. I can't find any piece of code which makes a copy of a platfrom deivce structure content pointed to while platform_device_add() is called from a board or machine file, either directly or indirectly via platform_device_register() or platform_add_devices(). Why should it be actually copied after all?. Searching for an example usage of _initdata similiar to that introduced by commit bdc58fb950a3a1b0bc3cbd8e23d21ecdde2ac9a2, "arm: omap1: fix a bunch of section mismatches", I can find the following: $ grep -r "struct .* platform_device .* = {" .|grep "__initdata"|grep -v '*' ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_kp_device __initdata = { ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_lcd_device __initdata = { ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_led_device __initdata = { ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_camera_device __initdata = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_mpu_gpio = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio1 = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio2 = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio3 = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio4 = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio5 = { ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio6 = { ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_mpu_gpio = { ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_gpio = { ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_mpu_gpio = { ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio1 = { ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio2 = { ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio3 = { ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio4 = { ./arch/arm/mach-omap2/board-rx51-peripherals.c:static struct platform_device rx51_si4713_dev __initdata_or_module = { So, there is no single exact pattern found in the whole tree, and a few instances of similiar patterns of two kinds found only inside omap. If I follow any of the two, either moving '__initdata' in front of 'platform_device' or using '__initdata_or_module' instead, the problem no longer hits me (using my custom defconfig). However, the former seems not conformant to what one can learn from include/linux/init.h, so I suspect that placing __initdata like this can be a noop, while the latter means "can be init if no module support", which would probably still exhibit the problem if so configured. How would you like to have this corrected then? Thanks, Janusz
Hi, On Wed, Jun 15, 2011 at 02:53:01PM +0200, Janusz Krzysztofik wrote: > > to me it sounds like missing __init/__exit annotations on the driver. > > See ams-delta-leds for instance: > > > > static int ams_delta_led_probe(struct platform_device *pdev) > > static int ams_delta_led_remove(struct platform_device *pdev) > > > > which means those drivers will have probe sitting outside or > > .init.text and trying to reference name which sits in .init.text ??? > > Could that be the case here ? > > Missing or not, addig them didn't help. ok... > > But it could also be that the platform_device shouldn't be marked > > __initdata. > > After either reverting one of commits mentioned, or applying my patch, > a read from /sys/devices/platform/ams-delta-led/uevent, for example, > returns: > > DRIVER=ams-delta-led > MODALIAS=platform:ams-delta-led > > The code responsible for returning these strings can be found in > drivers/base/core.c: > > static int dev_uevent(struct kset *kset, struct kobject *kobj, > struct kobj_uevent_env *env) > { > struct device *dev = to_dev(kobj); > ... > if (dev->driver) > add_uevent_var(env, "DRIVER=%s", dev->driver->name); > > /* have the bus specific function add its stuff */ > if (dev->bus && dev->bus->uevent) { > retval = dev->bus->uevent(dev, env); > ... > > The dev->bus->uevent for a platform device happens to sit in > drivers/base/platform.c: > > static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) > { > struct platform_device *pdev = to_platform_device(dev); > ... > add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, > (pdev->id_entry) ? pdev->id_entry->name : pdev->name); > ... > > For me, it looks like struct kobject, pointed to by kobj, being a member > of struct device, which in turn happens to be a member of struct > platform_device. > > AFAICU, there exist two sorts of platform devices from memory allocation > point of view: those created with platform_device_alloc(), which > allocates a memory where struct platform_device is kept, and those > created with platfrom_device_add(), which is provided with a pointer to > an already allocated platform device structure. > > I can't find any piece of code which makes a copy of a platfrom deivce > structure content pointed to while platform_device_add() is called from > a board or machine file, either directly or indirectly via > platform_device_register() or platform_add_devices(). > Why should it be actually copied after all?. true, it makes sense to remove __initdata from the platform_device structures. > Searching for an example usage of _initdata similiar to that introduced > by commit bdc58fb950a3a1b0bc3cbd8e23d21ecdde2ac9a2, "arm: omap1: fix a > bunch of section mismatches", I can find the following: > > $ grep -r "struct .* platform_device .* = {" .|grep "__initdata"|grep -v '*' > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_kp_device __initdata = { > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_lcd_device __initdata = { > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_led_device __initdata = { > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_camera_device __initdata = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_mpu_gpio = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio1 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio2 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio3 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio4 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio5 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio6 = { > ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_mpu_gpio = { > ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_gpio = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_mpu_gpio = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio1 = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio2 = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio3 = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio4 = { > ./arch/arm/mach-omap2/board-rx51-peripherals.c:static struct platform_device rx51_si4713_dev __initdata_or_module = { > > So, there is no single exact pattern found in the whole tree, and a few > instances of similiar patterns of two kinds found only inside omap. If I > follow any of the two, either moving '__initdata' in front of > 'platform_device' or using '__initdata_or_module' instead, the problem > no longer hits me (using my custom defconfig). However, the former seems > not conformant to what one can learn from include/linux/init.h, so I > suspect that placing __initdata like this can be a noop, while the > latter means "can be init if no module support", which would probably > still exhibit the problem if so configured. > > How would you like to have this corrected then? I guess removing __initdata from all platoform_device structures is the way to go. We need to find another way to silent the section mismatch warnings.
On Wed 15 Jun 2011 at 14:53:01 Janusz Krzysztofik wrote: > > $ grep -r "struct .* platform_device .* = {" .|grep "__initdata"|grep -v '*' ^ Without space here, sorry, but result the same. > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_kp_device __initdata = { > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_lcd_device __initdata = { > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_led_device __initdata = { > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_camera_device __initdata = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_mpu_gpio = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio1 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio2 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio3 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio4 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio5 = { > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio6 = { > ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_mpu_gpio = { > ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_gpio = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_mpu_gpio = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio1 = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio2 = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio3 = { > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio4 = { > ./arch/arm/mach-omap2/board-rx51-peripherals.c:static struct platform_device rx51_si4713_dev __initdata_or_module = {
On Wed 15 Jun 2011 at 15:00:08 Felipe Balbi wrote: > Hi, > > On Wed, Jun 15, 2011 at 02:53:01PM +0200, Janusz Krzysztofik wrote: > > > > $ grep -r "struct .* platform_device .* = {" .|grep "__initdata"|grep -v '*' > > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_kp_device __initdata = { > > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_lcd_device __initdata = { > > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_led_device __initdata = { > > ./arch/arm/mach-omap1/board-ams-delta.c:static struct platform_device ams_delta_camera_device __initdata = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_mpu_gpio = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio1 = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio2 = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio3 = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio4 = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio5 = { > > ./arch/arm/mach-omap1/gpio7xx.c:static struct __initdata platform_device omap7xx_gpio6 = { > > ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_mpu_gpio = { > > ./arch/arm/mach-omap1/gpio15xx.c:static struct __initdata platform_device omap15xx_gpio = { > > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_mpu_gpio = { > > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio1 = { > > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio2 = { > > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio3 = { > > ./arch/arm/mach-omap1/gpio16xx.c:static struct __initdata platform_device omap16xx_gpio4 = { > > ./arch/arm/mach-omap2/board-rx51-peripherals.c:static struct platform_device rx51_si4713_dev __initdata_or_module = { > > > > So, there is no single exact pattern found in the whole tree, and a > > few instances of similiar patterns of two kinds found only inside > > omap. If I follow any of the two, either moving '__initdata' in > > front of 'platform_device' or using '__initdata_or_module' > > instead, the problem no longer hits me (using my custom > > defconfig). However, the former seems not conformant to what one > > can learn from include/linux/init.h, so I suspect that placing > > __initdata like this can be a noop, while the latter means "can be > > init if no module support", which would probably still exhibit the > > problem if so configured. > > > > How would you like to have this corrected then? > > I guess removing __initdata from all platoform_device structures is > the way to go. We need to find another way to silent the section > mismatch warnings. OK. I'll cook a patch which removes __initdata from all listed above instead of only from board-ams-delta. Thanks, Janusz
Hi, On Wed, Jun 15, 2011 at 03:14:04PM +0200, Janusz Krzysztofik wrote: > > > How would you like to have this corrected then? > > > > I guess removing __initdata from all platoform_device structures is > > the way to go. We need to find another way to silent the section > > mismatch warnings. > > OK. I'll cook a patch which removes __initdata from all listed above > instead of only from board-ams-delta. you can add my Acked-by line if you wish: Acked-by: Felipe Balbi <balbi@ti.com> and thanks for going through all this ;-)
--- git/arch/arm/mach-omap1/board-ams-delta.c.orig 2011-06-06 18:06:57.000000000 +0200 +++ git/arch/arm/mach-omap1/board-ams-delta.c 2011-06-07 02:51:36.000000000 +0200 @@ -215,7 +215,7 @@ static struct omap_kp_platform_data ams_ .delay = 9, }; -static struct platform_device ams_delta_kp_device __initdata = { +static struct platform_device ams_delta_kp_device = { .name = "omap-keypad", .id = -1, .dev = { @@ -225,12 +225,12 @@ static struct platform_device ams_delta_ .resource = ams_delta_kp_resources, }; -static struct platform_device ams_delta_lcd_device __initdata = { +static struct platform_device ams_delta_lcd_device = { .name = "lcd_ams_delta", .id = -1, }; -static struct platform_device ams_delta_led_device __initdata = { +static struct platform_device ams_delta_led_device = { .name = "ams-delta-led", .id = -1 }; @@ -267,7 +267,7 @@ static struct soc_camera_link ams_delta_ .power = ams_delta_camera_power, }; -static struct platform_device ams_delta_camera_device __initdata = { +static struct platform_device ams_delta_camera_device = { .name = "soc-camera-pdrv", .id = 0, .dev = {
Commit 6d3163ce86dd386b4f7bda80241d7fea2bc0bb1d, "mm: check if any page in a pageblock is reserved before marking it MIGRATE_RESERVE", exhibited a bug on my Amstrad Delta resulting in reading /sys/device/platform/*/uevent for selected devices, namely "omap- keypad", "lcd_ams_delta", "ams-delta-led" and "soc-camera-pdrv", always ending up with segmentation faults: [ 77.499568] Unable to handle kernel paging request at virtual address 20676e69 [ 77.561984] pgd = c1004000 [ 77.583731] [20676e69] *pgd=00000000 [ 77.587515] Internal error: Oops: 15 [#1] PREEMPT [ 77.592324] Modules linked in: [ 77.595521] CPU: 0 Not tainted (3.0.0-rc2 #4) [ 77.600404] PC is at strlen+0x18/0x2c [ 77.604256] LR is at get_kobj_path_length+0x28/0x44 [ 77.609286] pc : [<c01586c4>] lr : [<c0154010>] psr: 20000013 [ 77.609344] sp : c1bf7e10 ip : c1bf7e20 fp : c1bf7e1c [ 77.620976] r10: c1020000 r9 : 00000000 r8 : c0359ab0 [ 77.626323] r7 : c1945608 r6 : c1945608 r5 : 00000018 r4 : c00243b0 [ 77.632988] r3 : 20676e69 r2 : 20676e69 r1 : 000000d0 r0 : 20676e69 [ 77.639659] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 77.646942] Control: 0000317f Table: 11004000 DAC: 00000015 [ 77.652823] Process udevadm (pid: 551, stack limit = 0xc1bf6270) [ 77.658959] Stack: (0xc1bf7e10 to 0xc1bf8000) [ 77.663455] 7e00: c1bf7e34 c1bf7e20 c0154010 c01586bc [ 77.671835] 7e20: 000000d0 00000003 c1bf7e54 c1bf7e38 c01542f4 c0153ff8 c180f340 00000001 [ 77.680214] 7e40: 00000003 c180f340 c1bf7eb4 c1bf7e58 c0154c70 c01542e8 c1bf7ec4 c1bf7e68 [ 77.688591] 7e60: c00ad9f4 c00acbd4 00000000 c03ebbd0 c1bf7e84 c040065c c00aeb48 00000000 [ 77.696966] 7e80: 00000010 000280d0 c1bf7ec4 c1945600 00000003 c1be2780 c0359af8 00000003 [ 77.705352] 7ea0: c1bf6000 c1be2798 c1bf7ec4 c1bf7eb8 c0155040 c0154ab8 c1bf7ee4 c1bf7ec8 [ 77.713731] 7ec0: c019d6e4 c015503c c1bf6000 00000000 c1941360 c1945608 c1bf7ef4 c1bf7ee8 [ 77.722108] 7ee0: c019cc50 c019d6b8 c1bf7f1c c1bf7ef8 c00ee5c4 c019cc38 00000003 00000003 [ 77.730486] 7f00: 00000003 c1be2780 c1b31b00 c1bf7f78 c1bf7f44 c1bf7f20 c00ee970 c00ee580 [ 77.738863] 7f20: c1b31b00 00013474 00000003 c1bf7f78 c0028128 00000000 c1bf7f74 c1bf7f48 [ 77.747240] 7f40: c00a10b0 c00ee92c c1bf7f94 c1bf7f58 c009ef78 00000000 00000000 c1b31b00 [ 77.755618] 7f60: 00000004 c0028128 c1bf7fa4 c1bf7f78 c00a16bc c00a1004 00000000 00000000 [ 77.763994] 7f80: c0028128 00000000 c1bf7fa4 00000003 00013474 beb42150 00000000 c1bf7fa8 [ 77.772366] 7fa0: c0027f80 c00a1680 00000003 00013474 00000003 00013474 00000003 00000000 [ 77.780739] 7fc0: 00000003 00013474 beb42150 00000004 00009350 000099d1 0000000d 00000000 [ 77.789113] 7fe0: 0001f180 beb42140 0000be2d 400bcfa4 00000010 00000003 11ffe831 11ffec31 [ 77.797420] Backtrace: [ 77.800118] [<c01586ac>] (strlen+0x0/0x2c) from [<c0154010>] (get_kobj_path_length+0x28/0x44) [ 77.808916] [<c0153fe8>] (get_kobj_path_length+0x0/0x44) from [<c01542f4>] (kobject_get_path+0x1c/0x58) [ 77.818489] r5:00000003 r4:000000d0 [ 77.822292] [<c01542d8>] (kobject_get_path+0x0/0x58) from [<c0154c70>] (kobject_uevent_env+0x1c8/0x584) [ 77.831857] r6:c180f340 r5:00000003 r4:00000001 [ 77.836747] [<c0154aa8>] (kobject_uevent_env+0x0/0x584) from [<c0155040>] (kobject_uevent+0x14/0x18) [ 77.846172] [<c015502c>] (kobject_uevent+0x0/0x18) from [<c019d6e4>] (store_uevent+0x3c/0x5c) [ 77.854970] [<c019d6a8>] (store_uevent+0x0/0x5c) from [<c019cc50>] (dev_attr_store+0x28/0x2c) [ 77.863659] r5:c1945608 r4:c1941360 [ 77.867533] [<c019cc28>] (dev_attr_store+0x0/0x2c) from [<c00ee5c4>] (flush_write_buffer+0x54/0x68) [ 77.876882] [<c00ee570>] (flush_write_buffer+0x0/0x68) from [<c00ee970>] (sysfs_write_file+0x54/0x7c) [ 77.886279] r8:c1bf7f78 r7:c1b31b00 r6:c1be2780 r5:00000003 r4:00000003 [ 77.893456] [<c00ee91c>] (sysfs_write_file+0x0/0x7c) from [<c00a10b0>] (vfs_write+0xbc/0x148) [ 77.902255] [<c00a0ff4>] (vfs_write+0x0/0x148) from [<c00a16bc>] (sys_write+0x4c/0x7c) [ 77.910335] r8:c0028128 r7:00000004 r6:c1b31b00 r5:00000000 r4:00000000 [ 77.917453] [<c00a1670>] (sys_write+0x0/0x7c) from [<c0027f80>] (ret_fast_syscall+0x0/0x2c) [ 77.925972] r6:beb42150 r5:00013474 r4:00000003 [ 77.930842] Code: e24cb004 e1a02000 ea000000 e2800001 (e5d03000) [ 77.941934] ---[ end trace dd9983793dca7d8c ]--- Removing __initdata tags, introduced by commit bdc58fb950a3a1b0bc3cbd8e23d21ecdde2ac9a2, "arm: omap1: fix a bunch of section mismatches", from corresponding platform_device structures declared in arch/arm/mach-omap1/board-ams-delta.c, corrects the problem for me, which may indicate that their members (.name ?) are still referred to during runtime so they shouldn't be freed after boot. Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> --- arch/arm/mach-omap1/board-ams-delta.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)