On Mon, Jan 19, 2026 at 09:19:02PM +0000, Lorenzo Stoakes wrote:
> We introduced the bitmap VMA type vma_flags_t in the aptly named commit
> 9ea35a25d51b ("mm: introduce VMA flags bitmap type") in order to permit
> future growth in VMA flags and to prevent the asinine requirement that VMA
> flags be available to 64-bit kernels only if they happened to use a bit
> number about 32-bits.
>
> This is a long-term project as there are very many users of VMA flags
> within the kernel that need to be updated in order to utilise this new
> type.
>
> In order to further this aim, this series adds a number of helper functions
> to enable ordinary interactions with VMA flags - that is testing, setting
> and clearing them.
>
> In order to make working with VMA bit numbers less cumbersome this series
> introduces the mk_vma_flags() helper macro which generates a vma_flags_t
> from a variadic parameter list, e.g.:
>
> vma_flags_t flags = mk_vma_flags(VMA_READ_BIT, VMA_WRITE_BIT,
> VMA_EXEC_BIT);
I didn't try to check every conversion, but the whole approach looks
nice to me and I think this design is ergonomic!
Jason
