Re: [PATCH RESEND 09/12] mm: make vm_area_desc utilise vma_flags_t only
flat view
From: Arnd Bergmann <arnd@arndb.de>
Date: 2026-01-20 16:45:05
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dri-devel, intel-gfx, keyrings, linux-cxl, linux-ext4, linux-fsdevel, linux-mm, linux-xfs, lkml, ntfs3, nvdimm
On Tue, Jan 20, 2026, at 17:22, Lorenzo Stoakes wrote:
On Tue, Jan 20, 2026 at 05:00:28PM +0100, Arnd Bergmann wrote:quoted
On Tue, Jan 20, 2026, at 16:10, Lorenzo Stoakes wrote:quoted
It strikes me that the key optimisation here is the inlining, now if the issue is that ye olde compiler might choose not to inline very small functions (seems unlikely) we could always throw in an __always_inline?I can think of three specific things going wrong with structures passed by value:I mean now you seem to be talking about it _in general_ which, _in theory_, kills the whole concept of bitmap VMA flags _altogether_ really, or at least any workable version of them.
No, what I'm saying is "understand what the pitfalls are", not
"don't do it". I think that is what Jason was also getting at.
Arnd