Re: [PATCH v11 01/23] x86/resctrl: Add __init attribute to functions called from resctrl_late_init()

[Dave Martin <Dave.Martin@arm.com>]

Hi,

On Wed, Feb 19, 2025 at 10:53:41AM -0600, Moger, Babu wrote:
> Hi Dave,
> 
> On 2/19/25 07:28, Dave Martin wrote:
> > Hi,
> > 
> > On Wed, Jan 22, 2025 at 02:20:09PM -0600, Babu Moger wrote:
> >> resctrl_late_init() has the __init attribute, but some of the functions
> >> called from it do not have the __init attribute.
> >>
> >> Add the __init attribute to all the functions in the call sequences to
> >> maintain consistency throughout.
> > 
> > (BTW, did you just find these cases by inspection, or were you getting
> > build warnings?
> > 
> > Even with CONFIG_DEBUG_SECTION_MISMATCH=y, I struggle to get build
> > warnings about section mismatches on inlined functions.  Even building
> > with -fno-inline doesn't flag them all up (though I don't think this
> > suppresses all inlining).
> > 
> > If you have a way of tracking these cases down automatically, I'd be
> > interested to know so that I can apply it elsewhere.)
> 
> It is mostly by code inspection at this point.
> 
> You can refer to this commit [1].
> 
> We used to see section mismatch warnings when non-init functions call
> __init functions.
> 
> MODPOST Module.symvers
> WARNING: modpost: vmlinux: section mismatch in reference:
> rdt_get_mon_l3_config+0x2b5 (section: .text) -> rdt_cpu_has (section:
> .init.text)
> WARNING: modpost: vmlinux: section mismatch in reference:
> rdt_get_mon_l3_config+0x408 (section: .text) -> rdt_cpu_has (section:
> .init.text)
> 
> 
> 1.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.14-rc3&id=bd334c86b5d70e5d1c6169991802e62c828d6f38

Right.

No problem with this patch, but I'll bear in mind for the future that
CONFIG_DEBUG_SECTION_MISMATCH has limitations...

Cheers
---Dave