Re: [PATCH 3/6] mm: always inline __mk_vma_flags() and invoked functions

Lorenzo Stoakes (Oracle)
2026-03-25T14:58:29Z

On Wed, Mar 25, 2026 at 02:54:50PM +0000, Pedro Falcato wrote:
> On Thu, Mar 05, 2026 at 10:50:16AM +0000, Lorenzo Stoakes (Oracle) wrote:
> > Be explicit about __mk_vma_flags() (which is used by the mk_vma_flags()
> > macro) always being inline, as we rely on the compiler converting this
> > function into meaningful.
> meaningful what?

'into the equivalent compile-time constant code' probably fine.

Andrew - could you update that if there's time?

>
> >
> > Also update all of the functions __mk_vma_flags() ultimately invokes to be
> > always inline too.
> >
> > Note that test_bitmap_const_eval() asserts that the relevant bitmap
> > functions result in build time constant values.
> >
> > Additionally, vma_flag_set() operates on a vma_flags_t type, so it is
> > inconsistently named versus other VMA flags functions.
> >
> > We only use vma_flag_set() in __mk_vma_flags() so we don't need to worry
> > about its new name being rather cumbersome, so rename it to
> > vma_flags_set_flag() to disambiguate it from vma_flags_set().
> >
> > Also update the VMA test headers to reflect the changes.
> >
> > Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
>
> Reviewed-by: Pedro Falcato <pfalcato@suse.de>
>
> Is there an actual difference in codegen here? On -O2.

No, this is more about consistency.

>
> --
> Pedro

Thanks, Lorenzo