Re: Dealing with SUBLEVEL overflow in backports

在 2022/2/8 7:58, Johannes Berg 写道:
> On Mon, 2022-02-07 at 23:18 +0100, Hauke Mehrtens wrote:
>> The LINUX_VERSION_CODE is fixed since 4.9.255, see here:
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=42efb098c75f9d4b95f7cf35d3d52e80cc2fde82
>>
>> SUBLEVEL should still contains the minor kernel version number.
>>
>> We could extend the macros in backport/backport-include/linux/version.h
>> to check for SUBLEVEL manually if it overflows.
>>
> Right, but the thing is we don't have SUBLEVEL in the *C* code, only in
> the Makefile.
>
> However, stupid me? This is trivial:
>
> --- a/Makefile.kernel
> +++ b/Makefile.kernel
> @@ -60,3 +60,5 @@ obj-$(CPTCFG_WLAN) += drivers/net/wireless/
>   #obj-$(CPTCFG_USB_USBNET) += drivers/net/usb/
>   #
>   #obj-$(CPTCFG_STAGING) += drivers/staging/
> +
> +subdir-ccflags-y += -DCOMPAT_KERNEL_SUBLEVEL=$(SUBLEVEL)
>
>
> (whatever the name is)

Ah I tried this approach but find that this may break other modules
depending on our headers because the cflag won't come with be
inherited by them.

So probably we need to generate a header for this purpose as well.

Thanks.
- Jiaxun


>
> johannes

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