* Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10
@ 2014-08-14 11:16 Chetan Nanda
2014-08-14 13:38 ` Valdis.Kletnieks at vt.edu
0 siblings, 1 reply; 4+ messages in thread
From: Chetan Nanda @ 2014-08-14 11:16 UTC (permalink / raw)
To: kernelnewbies
Hi,
I am trying to enable 'CONFIG_DEBUG_SET_MODULE_RONX' config option on
3.10 kernel (for ARM arch) via writing CONFIG_DEBUG_SET_MODULE_RONX=y
at the end of
board specific config file.
But .config generated after kernel build do not have this option enabled.
Do I need to enable any other option also before enabling this one?
Thanks,
Chetan Nanda
^ permalink raw reply [flat|nested] 4+ messages in thread
* Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10
2014-08-14 11:16 Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10 Chetan Nanda
@ 2014-08-14 13:38 ` Valdis.Kletnieks at vt.edu
2014-08-15 10:49 ` Paul Bolle
0 siblings, 1 reply; 4+ messages in thread
From: Valdis.Kletnieks at vt.edu @ 2014-08-14 13:38 UTC (permalink / raw)
To: kernelnewbies
On Thu, 14 Aug 2014 16:46:22 +0530, Chetan Nanda said:
> Hi,
>
> I am trying to enable 'CONFIG_DEBUG_SET_MODULE_RONX' config option on
> 3.10 kernel (for ARM arch) via writing CONFIG_DEBUG_SET_MODULE_RONX=y
> at the end of
> board specific config file.
>
> But .config generated after kernel build do not have this option enabled.
>
> Do I need to enable any other option also before enabling this one?
Go into 'make menuconfig', Enter a '/'. In the textbox, enter a substring
of the symbol (I entered 'MODULE_RONX').
At least on x86_64, this shows me:
x Symbol: DEBUG_SET_MODULE_RONX [=y] x
x Type : boolean x
x Prompt: Set loadable kernel module data as NX and text as RO x
x Location: x
x (1) -> Kernel hacking x
x Defined at arch/x86/Kconfig.debug:112 x
x Depends on: MODULES [=y]
Perhaps it's different on ARM - seems pretty silly to enable MODULE_RONX
if your kernel doesn't have CONFIG_MODULES=y in the build.
But in general, you should *NOT* simply edit the config file, because
that does *not* do any checking of select/depend as you make the change.
Then when you actually make the kernel, it *will* re-drive the select/depend
logic, and convert the provided .config to a self-consistent form. Of course,
there is zero guarantee that the self-consistent form corresponds to your
intentions....
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10
2014-08-14 13:38 ` Valdis.Kletnieks at vt.edu
@ 2014-08-15 10:49 ` Paul Bolle
2014-08-17 7:57 ` Chetan Nanda
0 siblings, 1 reply; 4+ messages in thread
From: Paul Bolle @ 2014-08-15 10:49 UTC (permalink / raw)
To: kernelnewbies
On Thu, 2014-08-14 at 09:38 -0400, Valdis Kletnieks wrote:
> On Thu, 14 Aug 2014 16:46:22 +0530, Chetan Nanda said:
> > I am trying to enable 'CONFIG_DEBUG_SET_MODULE_RONX' config option on
> > 3.10 kernel (for ARM arch) via writing CONFIG_DEBUG_SET_MODULE_RONX=y
> > at the end of
> > board specific config file.
> >
> > But .config generated after kernel build do not have this option enabled.
> >
> > Do I need to enable any other option also before enabling this one?
>
> Go into 'make menuconfig', Enter a '/'. In the textbox, enter a substring
> of the symbol (I entered 'MODULE_RONX').
>
> At least on x86_64, this shows me:
>
> x Symbol: DEBUG_SET_MODULE_RONX [=y] x
> x Type : boolean x
> x Prompt: Set loadable kernel module data as NX and text as RO x
> x Location: x
> x (1) -> Kernel hacking x
> x Defined at arch/x86/Kconfig.debug:112 x
> x Depends on: MODULES [=y]
>
> Perhaps it's different on ARM - seems pretty silly to enable MODULE_RONX
> if your kernel doesn't have CONFIG_MODULES=y in the build.
DEBUG_SET_MODULE_RONX was added for ARM in v3.14:
$ git grep -nw DEBUG_SET_MODULE_RONX v3.13
v3.13:arch/s390/Kconfig.debug:32:config DEBUG_SET_MODULE_RONX
v3.13:arch/x86/Kconfig.debug:103:config DEBUG_SET_MODULE_RONX
$ git grep -nw DEBUG_SET_MODULE_RONX v3.14
v3.14:arch/arm/Kconfig.debug:1198:config DEBUG_SET_MODULE_RONX
v3.14:arch/s390/Kconfig.debug:32:config DEBUG_SET_MODULE_RONX
v3.14:arch/x86/Kconfig.debug:103:config DEBUG_SET_MODULE_RONX
See commit dca9aa92fc7c ("ARM: add DEBUG_SET_MODULE_RONX option to
Kconfig"). So using that Kconfig symbol in v3.10 is pointless (for ARM).
> But in general, you should *NOT* simply edit the config file, because
> that does *not* do any checking of select/depend as you make the change.
>
> Then when you actually make the kernel, it *will* re-drive the select/depend
> logic, and convert the provided .config to a self-consistent form.
And, as Chetan noticed, it will also drop Kconfig symbols that are
unknown for that build (as, in this case, DEBUG_SET_MODULE_RONX).
> Of course,
> there is zero guarantee that the self-consistent form corresponds to your
> intentions....
Paul Bolle
^ permalink raw reply [flat|nested] 4+ messages in thread
* Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10
2014-08-15 10:49 ` Paul Bolle
@ 2014-08-17 7:57 ` Chetan Nanda
0 siblings, 0 replies; 4+ messages in thread
From: Chetan Nanda @ 2014-08-17 7:57 UTC (permalink / raw)
To: kernelnewbies
On Fri, Aug 15, 2014 at 4:19 PM, Paul Bolle <pebolle@tiscali.nl> wrote:
> On Thu, 2014-08-14 at 09:38 -0400, Valdis Kletnieks wrote:
>> On Thu, 14 Aug 2014 16:46:22 +0530, Chetan Nanda said:
>> > I am trying to enable 'CONFIG_DEBUG_SET_MODULE_RONX' config option on
>> > 3.10 kernel (for ARM arch) via writing CONFIG_DEBUG_SET_MODULE_RONX=y
>> > at the end of
>> > board specific config file.
>> >
>> > But .config generated after kernel build do not have this option enabled.
>> >
>> > Do I need to enable any other option also before enabling this one?
>>
>> Go into 'make menuconfig', Enter a '/'. In the textbox, enter a substring
>> of the symbol (I entered 'MODULE_RONX').
>>
>> At least on x86_64, this shows me:
>>
>> x Symbol: DEBUG_SET_MODULE_RONX [=y] x
>> x Type : boolean x
>> x Prompt: Set loadable kernel module data as NX and text as RO x
>> x Location: x
>> x (1) -> Kernel hacking x
>> x Defined at arch/x86/Kconfig.debug:112 x
>> x Depends on: MODULES [=y]
>>
>> Perhaps it's different on ARM - seems pretty silly to enable MODULE_RONX
>> if your kernel doesn't have CONFIG_MODULES=y in the build.
>
> DEBUG_SET_MODULE_RONX was added for ARM in v3.14:
> $ git grep -nw DEBUG_SET_MODULE_RONX v3.13
> v3.13:arch/s390/Kconfig.debug:32:config DEBUG_SET_MODULE_RONX
> v3.13:arch/x86/Kconfig.debug:103:config DEBUG_SET_MODULE_RONX
> $ git grep -nw DEBUG_SET_MODULE_RONX v3.14
> v3.14:arch/arm/Kconfig.debug:1198:config DEBUG_SET_MODULE_RONX
> v3.14:arch/s390/Kconfig.debug:32:config DEBUG_SET_MODULE_RONX
> v3.14:arch/x86/Kconfig.debug:103:config DEBUG_SET_MODULE_RONX
>
> See commit dca9aa92fc7c ("ARM: add DEBUG_SET_MODULE_RONX option to
> Kconfig"). So using that Kconfig symbol in v3.10 is pointless (for ARM).
>
>> But in general, you should *NOT* simply edit the config file, because
>> that does *not* do any checking of select/depend as you make the change.
>>
>> Then when you actually make the kernel, it *will* re-drive the select/depend
>> logic, and convert the provided .config to a self-consistent form.
>
> And, as Chetan noticed, it will also drop Kconfig symbols that are
> unknown for that build (as, in this case, DEBUG_SET_MODULE_RONX).
>
>> Of course,
>> there is zero guarantee that the self-consistent form corresponds to your
>> intentions....
>
Hi Valdis, Paul,
Thanks for your mails.
I would try to backport 'DEBUG_SET_MODULE_RONX' support from v3.14
Thanks,
Chetan Nanda
>
> Paul Bolle
>
^ permalink raw reply [flat|nested] 4+ messages in thread
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2014-08-14 11:16 Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10 Chetan Nanda
2014-08-14 13:38 ` Valdis.Kletnieks at vt.edu
2014-08-15 10:49 ` Paul Bolle
2014-08-17 7:57 ` Chetan Nanda
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