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Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Dec 09, 2024 at 03:38:28PM +0100, Jann Horn wrote: > On Mon, Dec 9, 2024 at 3:11 PM Lorenzo Stoakes > wrote: > > On Mon, Dec 09, 2024 at 03:00:08PM +0100, David Hildenbrand wrote: > > > On 09.12.24 14:25, Vlastimil Babka wrote: > > > > On 12/9/24 10:16, David Hildenbrand wrote: > > > > > On 06.12.24 20:16, Lorenzo Stoakes wrote: > > > > > > There are a number of means of interacting with VMA operations within mm, > > > > > > and we have on occasion not been made aware of impactful changes due to > > > > > > these sitting in different files, most recently in [0]. > > > > > > > > > > > > Correct this by bringing all VMA operations under the same section in > > > > > > MAINTAINERS. Additionally take the opportunity to combine MEMORY MAPPING > > > > > > with VMA as there needn't be two entries as they amount to the same thing. > > > > > > > > > > > > [0]:https://lore.kernel.org/linux-mm/CAG48ez0siYGB8GP5+Szgj2ovBZAkL6Zi4n6GUAjzzjFV9LTkRQ@mail.gmail.com/ > > > > > > > > > > > > Signed-off-by: Lorenzo Stoakes > > > > > > --- > > > > > > MAINTAINERS | 19 +++++++------------ > > > > > > 1 file changed, 7 insertions(+), 12 deletions(-) > > > > > > > > > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > > > > > index 1e930c7a58b1..95db20c26f5f 100644 > > > > > > --- a/MAINTAINERS > > > > > > +++ b/MAINTAINERS > > > > > > @@ -15060,18 +15060,6 @@ F: tools/mm/ > > > > > > F: tools/testing/selftests/mm/ > > > > > > N: include/linux/page[-_]* > > > > > > > > > > > > -MEMORY MAPPING > > > > > > -M: Andrew Morton > > > > > > -M: Liam R. Howlett > > > > > > -M: Lorenzo Stoakes > > > > > > -R: Vlastimil Babka > > > > > > -R: Jann Horn > > > > > > -L: linux-mm@kvack.org > > > > > > -S: Maintained > > > > > > -W: http://www.linux-mm.org > > > > > > -T: git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > > > > > > -F: mm/mmap.c > > > > > > - > > > > > > MEMORY TECHNOLOGY DEVICES (MTD) > > > > > > M: Miquel Raynal > > > > > > M: Richard Weinberger > > > > > > @@ -25028,6 +25016,13 @@ L: linux-mm@kvack.org > > > > > > S: Maintained > > > > > > W: https://www.linux-mm.org > > > > > > T: git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > > > > > > +F: mm/madvise.c > > > > > > +F: mm/mlock.c > > > > > > +F: mm/mmap.c > > > > > > +F: mm/mprotect.c > > > > > > +F: mm/mremap.c > > > > > > +F: mm/mseal.c > > > > > > +F: mm/msync.c > > > > > > > > > > Not sure about mprotect.c, mlock.c and madvise.c, though. I'd claim that > > > > > the real "magic" they perform is in page table handling and not > > > > > primarily VMA handling (yes, both do VMA changes, but they are the > > > > > "easy" part ;) ). > > > > > > > > I'd think that moving vma files into MEMORY MAPPING (and not the other way) > > > > would result in a better overal name, that would be a better fit for the > > > > newly added files too? > > > > > > Maybe. I think vma.c should likely have a different set of maintainers than > > > madvise.c and mprotect.c. (again, the magic is in page table modifications) > > > > The bulk of the logic in mremap.c is related to page tables so by this > > logic then, that is out too, right? > > FWIW, I think technically you can have multiple entries in MAINTAINERS > that cover the same file, maybe that would make sense for files that > belong to multiple parts of the kernel? Or maybe I'm making things too > complicated and it'd be simpler to have some kind of more generic > "core MM for userspace mappings" entry or such. I think it's faintly ludicrous to separate things on the basis of whether they explicitly manipulate one part of the kernel or another, and it'd be an odd thing to be trusted with one 'portion' of a file based on some fuzzy sense of which bits are 'magic' and therefore out of bounds and which are presumably not... I don't think it makes sense to separate the 'VMA' bits from these files other than perhaps refactoring things a bit (badly needed actually). The page table manipulation very sorely needs improvement and de-duplication, I am somewhat taken aback that it is thought that I might not be able to do so given I had already paid serious consideration to doing work in this area based on guard page work (not sure if that work would now be welcome?) To me I politely disagree with the assessment made here, but if a senior member of the kernel objects of course I'll withdraw it. But yeah I don't think that's workable. We will just have to hope that we notice mremap changes that might be problematic going forward, I might therefore update my lei settings accordingly...