Hi,

On 11/20/22 14:55, Andy Shevchenko wrote:

On Sat, Nov 19, 2022 at 11:08:17PM +0000, Alexander Lobakin wrote:

quoted

common.o is linked to both intel_skl_int3472_{discrete,tps68470}:

quoted

scripts/Makefile.build:252: ./drivers/platform/x86/intel/int3472/Makefile:
common.o is added to multiple modules: intel_skl_int3472_discrete
intel_skl_int3472_tps68470

Although both drivers share one Kconfig option
(CONFIG_INTEL_SKL_INT3472), it's better to not link one object file
into several modules (and/or vmlinux).
Under certain circumstances, such can lead to the situation fixed by
commit 637a642f5ca5 ("zstd: Fixing mixed module-builtin objects").

Introduce the new module, intel_skl_int3472_common, to provide the
functions from common.o to both discrete and tps68470 drivers. This
adds only 3 exports and doesn't provide any changes to the actual
code.

Replying to Andy's reply here since I never saw the original submission
which was not Cc-ed to platform-driver-x86@vger.kernel.org .

As you mention already in the commit msg, the issue from:

commit 637a642f5ca5 ("zstd: Fixing mixed module-builtin objects")

is not an issue here since both modules sharing the .o file are
behind the same Kconfig option.

So there is not really an issue here and common.o is tiny, so
small chances are it does not ever increase the .ko size
when looking a the .ko size rounded up to a multiple of
the filesystem size.

At the same time adding an extra module does come with significant
costs, it will eat up at least 1 possibly more then 1 fs blocks
(I don't know what the module header size overhead is).

And it needs to be loaded separately and module loading is slow;
and it will grow the /lib/modules/<kver>/modules.* sizes.

So nack from me for this patch, since I really don't see
it adding any value.

Regards,

Hans

...

quoted

+MODULE_IMPORT_NS(INTEL_SKL_INT3472);
+

Redundant blank line. You may put it to be last MODULE_*() in the file, if you
think it would be more visible.

quoted

 MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Discrete Device Driver");
 MODULE_AUTHOR("Daniel Scally [off-list ref]");
 MODULE_LICENSE("GPL v2");

...

quoted

+MODULE_IMPORT_NS(INTEL_SKL_INT3472);
+
 MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI TPS68470 Device Driver");
 MODULE_AUTHOR("Daniel Scally [off-list ref]");
 MODULE_LICENSE("GPL v2");

Ditto. And the same to all your patches.