Re: [PATCH v3 39/40] mm/huge_memory: remove vma_is_special_huge()
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From: "Zi Yan" <ziy@nvidia.com>
Date: 2026-10-01 15:22:15
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bpf, fuse-devel, kvm, kvm-riscv, kvmarm, linux-arch, linux-doc, linux-fsdevel, linux-mm, linux-perf-users, linux-rdma, linux-s390, linux-scsi, linux-sound, linux-trace-kernel, linux-usb, linuxppc-dev, lkml, selinux, sparclinux
On Thu Sep 17, 2026 at 12:22 PM EDT, Lorenzo Stoakes (ARM) wrote:
vma_is_special_huge() tests whether either the VMA_PFNMAP_BIT or VMA_MIXEDMAP_BIT is set (i.e. whether the VMA is a kernel-owned mapping), but with a DAX carve-out. DAX however no longer sets VMA_MIXEDMAP_BIT, so this carve-out is no longer required. Therefore test for vma_is_kernel_owned() instead and also drop the VMA_IO_BIT check, as it is now redundant since it is enforced that only kernel-owned mappings can set this flag. This also eliminates another overloaded use of 'special' within mm. No functional change intended. Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org> --- mm/huge_memory.c | 18 ++++-------------- 1 file changed, 4 insertions(+), 14 deletions(-)
Acked-by: Zi Yan <ziy@nvidia.com> -- Best Regards, Yan, Zi