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charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/3WOyw6CMBBFf8V07ZA+CAVX/odhUcoUqoaaKRIJ4 d9tce3y3Jk5dzYWkTxGdjltjHDx0YcpgTyfmB3NNCD4PjGTXFa84RqiajhYH4DQ9CuIGrVyrq5 K6Vg6ehE6/zmEt/bH8d3d0c7Zkjc6ExE6MpMdc3SgLhSQFXk8+jgHWo+HFpE1f7sXAQmNdqqpe SVVeX0gTfgsAg2s3ff9C6Oc0mreAAAA X-Change-ID: 20260907-s390-cio-ready-18e73ff8642f To: Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Christian Borntraeger , Mike Rapoport , Peter Oberparleiter , Sven Schnelle , Vineeth Vijayan , Vlastimil Babka , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org X-Mailer: b4 0.17-dev X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: B2C2840003 X-Stat-Signature: skabsheobuhhbn1xr78h9bstjbn4enad X-HE-Tag: 1789038010-291847 X-HE-Meta: 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 1odY7PcG NuhGbisS+i35+UIzp2oIubx10j5YbcO69JoodNJC/rN5ERMeIwc5smOzAo8w6QwzKF56li+y1gjLYJx3Ht+HRbZ0z9EzqIeJIXGS2HbH+JUomZzcDgWK7EqBk0obQClbudr9OmEzf0fbzIVA/cfTCs5gzy2gFaV7/KzNhghwCOkKAUhglJvhtXjqlNWdl38RkuqEgojrijNWyg9lZZ5GC2NsfEUGaCyyRBxqgT1FodrmD67LWxoPEvZypo3pZOLQV1whZmHRtF2aN2446P/CeM8WfdFKJo0AkUyUBlQP0QhoyhisTiORqlpSuFMjBcAQvsO1S7iUiNzoDYoUny52vSmdVuPQVMQIT0fMQ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The saga continues :) This series covers CIO, QDIO, SCM and IDAL buffer allocations. This is a (small) part of larger work of replacing page allocator calls with kmalloc. My initial intention a few month ago was to remove ugly casts [1], but then willy pointed out that Linus objected to something like this [2] and it looks like more than a decade old technical debt. Largely, anything that doesn't need struct page (or a memdesc in the future) should just use kmalloc() or kvmalloc() to allocate memory. kmalloc() guarantees alignment, physical contiguity and working virt_to_phys() and beside nicer API that returns void * on alloc and doesn't require to know the allocation size on free, kmalloc() provides better debugging capabilities than page allocator. Another thing is that touching these allocation sites gives the reviewers opportunity to see if a PAGE_SIZE buffer is actually needed or maybe another size is appropriate. For larger allocations that don't need physically contiguous memory kvmalloc() can be a better option that __get_free_pages() because under memory pressure it's is easier to allocate several order-0 pages than a physically contiguous chunk with the same number of pages. And last, but not least, removing needless calls to page allocator should help with memdesc (aka project folio) conversion. There will be way less places to audit to see if the user was actually using struct page. The patches are grouped by buffer usage and ordered by file or subsystem. Related CHSC work areas and requests are kept together. While on it, use __free(kfree) for the SCM information buffer and local buffers in synchronous CHSC ioctl handlers. The CHSC cleanup is kept in a separate patch. Also in git: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git gfp-to-kmalloc/s390-cio [1] https://lore.kernel.org/all/20251018093002.3660549-1-rppt@kernel.org/ [2] https://lore.kernel.org/all/CA+55aFwp4iy4rtX2gE2WjBGFL=NxMVnoFeHqYa2j1dYOMMGqxg@mail.gmail.com/ --- v2 changes: Address sashiko comments: * Allocate the exact CMB area size and reject invalid channel counts. Correct the alignment requirement to 32 bytes. * Tell kmemleak to ignore IDAL data buffers as only DMA addresses are kept. * Drop the obsolete kmemleak exemption for the QDIO CCW. v1: https://patch.msgid.link/20260907-s390-cio-ready-v1-0-ca7f39806234@kernel.org --- Mike Rapoport (Microsoft) (13): s390/chsc: Use kzalloc() for CUBs s390/chsc: Use kzalloc() for the SEI work area s390/chsc_sch: Use kzalloc() for CHSC requests s390/chsc_sch: Use __free(kfree) for synchronous CHSC requests s390/cio: Use kzalloc() for CHSC work areas s390/cmf: Use kmalloc() for the CMB area s390/idals: Use kmalloc() for IDAL data buffers s390/qdio_main: Use kzalloc() for the IRQ structure s390/qdio_main: Use kzalloc() for the QDR s390/qdio_setup: Use kzalloc() for QDIO buffers s390/qdio_setup: Use kzalloc() for the storage list s390/qdio_setup: Use kzalloc() for the SSQD request s390/scm: Use kmalloc() for SCM information arch/s390/include/asm/idals.h | 9 +- drivers/s390/cio/chsc.c | 20 +-- drivers/s390/cio/chsc_sch.c | 300 ++++++++++++++-------------------------- drivers/s390/cio/cmf.c | 11 +- drivers/s390/cio/qdio.h | 2 +- drivers/s390/cio/qdio_main.c | 23 ++- drivers/s390/cio/qdio_setup.c | 14 +- drivers/s390/cio/qdio_thinint.c | 2 +- drivers/s390/cio/scm.c | 7 +- 9 files changed, 150 insertions(+), 238 deletions(-) --- base-commit: cee9395acd8043be0644b25c34bfa86623f2b935 change-id: 20260907-s390-cio-ready-18e73ff8642f -- Sincerely yours, Mike.