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Tue, 07 Oct 2025 05:20:44 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki , Andrey Ryabinin , Alexander Potapenko Subject: [PATCH v4 06/10] mm/kasan: Support non-blocking GFP in kasan_populate_vmalloc() Date: Tue, 7 Oct 2025 14:20:31 +0200 Message-ID: <20251007122035.56347-7-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251007122035.56347-1-urezki@gmail.com> References: <20251007122035.56347-1-urezki@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A "gfp_mask" is already passed to kasan_populate_vmalloc() as an argument to respect GFPs from callers and KASAN uses it for its internal allocations. But apply_to_page_range() function ignores GFP flags due to a hard-coded mask. Wrap the call with memalloc_apply_gfp_scope()/memalloc_restore_scope() so that non-blocking GFP flags(GFP_ATOMIC, GFP_NOWAIT) are respected. Cc: Andrey Ryabinin Cc: Alexander Potapenko Reviewed-by: Baoquan He Reviewed-by: Andrey Ryabinin Signed-off-by: Uladzislau Rezki (Sony) --- mm/kasan/shadow.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c index 5d2a876035d6..a30d84bfdd52 100644 --- a/mm/kasan/shadow.c +++ b/mm/kasan/shadow.c @@ -377,18 +377,10 @@ static int __kasan_populate_vmalloc(unsigned long sta= rt, unsigned long end, gfp_ * page tables allocations ignore external gfp mask, enforce it * by the scope API */ - if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D __GFP_IO) - flags =3D memalloc_nofs_save(); - else if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D 0) - flags =3D memalloc_noio_save(); - + flags =3D memalloc_apply_gfp_scope(gfp_mask); ret =3D apply_to_page_range(&init_mm, start, nr_pages * PAGE_SIZE, kasan_populate_vmalloc_pte, &data); - - if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D __GFP_IO) - memalloc_nofs_restore(flags); - else if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D 0) - memalloc_noio_restore(flags); + memalloc_restore_scope(flags); =20 ___free_pages_bulk(data.pages, nr_pages); if (ret) --=20 2.47.3