Messages in this thread | | | From | Sumit Garg <> | Date | Mon, 6 Feb 2023 11:52:43 +0530 | Subject | Re: [PATCH v2 0/4] Remove get_kernel_pages() |
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On Sat, 4 Feb 2023 at 09:36, Ira Weiny <ira.weiny@intel.com> wrote: > > Sumit, > > I did not see a follow up on this series per your last email.[1] I'd like to > move forward with getting rid of kmap_to_page(). So Hopefully this can land > and you can build on this rather than the other way around?
Apologies Ira for keeping you waiting. Actually I was fully involved with other high priority work with my upstream review backlog increasing. So I wasn't able to devote time to this work. Sure I will rebase my work on top of your changes.
-Sumit
> > All, > > Al Viro found[2] that kmap_to_page() is broken. But not only is it broken, it > presents confusion over how highmem should be used because kmap() and friends > should not be used for 'long term' mappings. > > get_kernel_pages() is a caller of kmap_to_page(). It only has one caller > [shm_get_kernel_pages()] which does not need the functionality. > > Alter shm_get_kernel_pages() to no longer call get_kernel_pages() and remove > get_kernel_pages(). Along the way it was noted that shm_get_kernel_pages() > does not have any need to support vmalloc'ed addresses either. Remove that > functionality to clean up the logic. > > This series also fixes is_kmap_addr() and uses it to ensure no kmap addresses > slip in later. > > [1] https://lore.kernel.org/all/CAFA6WYMqEVDVW-ifoh-V9ni1zntYdes8adQKf2XXAUpqdaW53w@mail.gmail.com/ > [2] https://lore.kernel.org/lkml/YzSSl1ItVlARDvG3@ZenIV > > To: Sumit Garg <sumit.garg@linaro.org> > To: Andrew Morton <akpm@linux-foundation.org> > Cc: "Al Viro" <viro@zeniv.linux.org.uk> > Cc: "Christoph Hellwig" <hch@lst.de> > Cc: linux-kernel@vger.kernel.org > Cc: op-tee@lists.trustedfirmware.org > Cc: linux-mm@kvack.org > Cc: Jens Wiklander <jens.wiklander@linaro.org> > Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > > --- > Changes in v2: > - Al Viro: Avoid allocating the kiov. > - Sumit: Update cover letter to clarify the motivation behind removing > get_kernel_pages() > - Link to v1: https://lore.kernel.org/r/20221002002326.946620-1-ira.weiny@intel.com > > --- > Ira Weiny (4): > highmem: Enhance is_kmap_addr() to check kmap_local_page() mappings > tee: Remove vmalloc page support > tee: Remove call to get_kernel_pages() > mm: Remove get_kernel_pages() > > drivers/tee/tee_shm.c | 37 ++++++++++--------------------------- > include/linux/highmem-internal.h | 5 ++++- > include/linux/mm.h | 2 -- > mm/swap.c | 30 ------------------------------ > 4 files changed, 14 insertions(+), 60 deletions(-) > --- > base-commit: 0136d86b78522bbd5755f8194c97a987f0586ba5 > change-id: 20230203-get_kernel_pages-199342cfba79 > > Best regards, > -- > Ira Weiny <ira.weiny@intel.com>
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