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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 Wed, Jun 18, 2025 at 08:42:53PM +0100, Lorenzo Stoakes wrote: > The core kernel code is currently very inconsistent in its use of > vm_flags_t vs. unsigned long. This prevents us from changing the type of > vm_flags_t in the future and is simply not correct, so correct this. > > While this results in rather a lot of churn, it is a critical pre-requisite > for a future planned change to VMA flag type. > > Additionally, update VMA userland tests to account for the changes. > > To make review easier and to break things into smaller parts, driver and > architecture-specific changes is left for a subsequent commit. > > The code has been adjusted to cascade the changes across all calling code > as far as is needed. > > We will adjust architecture-specific and driver code in a subsequent patch. > > Overall, this patch does not introduce any functional change. > > Signed-off-by: Lorenzo Stoakes > --- [Adding Uladzislau to Cc] Hi Lorenzo, just wanted to clarify one thing. You know, many people acked and reviewed it, which makes me wonder if I'm misunderstanding something... but it wouldn't hurt to check, right? > diff --git a/mm/execmem.c b/mm/execmem.c > index 9720ac2dfa41..bd95ff6a1d03 100644 > --- a/mm/execmem.c > +++ b/mm/execmem.c > @@ -26,7 +26,7 @@ static struct execmem_info default_execmem_info __ro_after_init; > > #ifdef CONFIG_MMU > static void *execmem_vmalloc(struct execmem_range *range, size_t size, > - pgprot_t pgprot, unsigned long vm_flags) > + pgprot_t pgprot, vm_flags_t vm_flags) > { > bool kasan = range->flags & EXECMEM_KASAN_SHADOW; > gfp_t gfp_flags = GFP_KERNEL | __GFP_NOWARN; Is it intentional to use vm_flags_t for vm_struct flags, not vma flags? You didn't update the type of struct vm_struct.flags field and vm_flags parameter in __vmalloc_node_range_noprof() (of MMU version in mm/vmalloc.c) ...which makes me suspect it's not intentional? > @@ -82,7 +82,7 @@ struct vm_struct *execmem_vmap(size_t size) > } > #else > static void *execmem_vmalloc(struct execmem_range *range, size_t size, > - pgprot_t pgprot, unsigned long vm_flags) > + pgprot_t pgprot, vm_flags_t vm_flags) > { > return vmalloc(size); > } ditto. > @@ -284,7 +284,7 @@ void execmem_cache_make_ro(void) > > static int execmem_cache_populate(struct execmem_range *range, size_t size) > { > - unsigned long vm_flags = VM_ALLOW_HUGE_VMAP; > + vm_flags_t vm_flags = VM_ALLOW_HUGE_VMAP; > struct vm_struct *vm; > size_t alloc_size; > int err = -ENOMEM; ditto. > @@ -407,7 +407,7 @@ void *execmem_alloc(enum execmem_type type, size_t size) > { > struct execmem_range *range = &execmem_info->ranges[type]; > bool use_cache = range->flags & EXECMEM_ROX_CACHE; > - unsigned long vm_flags = VM_FLUSH_RESET_PERMS; > + vm_flags_t vm_flags = VM_FLUSH_RESET_PERMS; > pgprot_t pgprot = range->pgprot; > void *p; ditto. > diff --git a/mm/internal.h b/mm/internal.h > index feda91c9b3f4..506c6fc8b6dc 100644 > --- a/mm/internal.h > +++ b/mm/internal.h > @@ -1360,7 +1360,7 @@ int migrate_device_coherent_folio(struct folio *folio); > > struct vm_struct *__get_vm_area_node(unsigned long size, > unsigned long align, unsigned long shift, > - unsigned long flags, unsigned long start, > + vm_flags_t vm_flags, unsigned long start, > unsigned long end, int node, gfp_t gfp_mask, > const void *caller); ditto. > diff --git a/mm/nommu.c b/mm/nommu.c > index b624acec6d2e..87e1acab0d64 100644 > --- a/mm/nommu.c > +++ b/mm/nommu.c > @@ -126,7 +126,7 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags) > > void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align, > unsigned long start, unsigned long end, gfp_t gfp_mask, > - pgprot_t prot, unsigned long vm_flags, int node, > + pgprot_t prot, vm_flags_t vm_flags, int node, > const void *caller) > { ditto. > return __vmalloc_noprof(size, gfp_mask); -- Cheers, Harry / Hyeonggon