| Message ID | d40cb239d0ca01e51f7fc2a276398e8f4dedf9ff.1681508038.git.lstoakes@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | remove the vmas parameter from GUP APIs | expand |
On Sat, Apr 15, 2023 at 12:27:13AM +0100, Lorenzo Stoakes wrote: > No invocation of get_user_pages() uses the vmas parameter, so remove > it. > > The GUP API is confusing and caveated. Recent changes have done much to > improve that, however there is more we can do. Exporting vmas is a prime > target as the caller has to be extremely careful to preclude their use > after the mmap_lock has expired or otherwise be left with dangling > pointers. > > Removing the vmas parameter focuses the GUP functions upon their primary > purpose - pinning (and outputting) pages as well as performing the actions > implied by the input flags. > > This is part of a patch series aiming to remove the vmas parameter > altogether. > > Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> > Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
On Sat, Apr 15, 2023 at 12:27:13AM +0100, Lorenzo Stoakes wrote: > No invocation of get_user_pages() uses the vmas parameter, so remove > it. > > The GUP API is confusing and caveated. Recent changes have done much to > improve that, however there is more we can do. Exporting vmas is a prime > target as the caller has to be extremely careful to preclude their use > after the mmap_lock has expired or otherwise be left with dangling > pointers. > > Removing the vmas parameter focuses the GUP functions upon their primary > purpose - pinning (and outputting) pages as well as performing the actions > implied by the input flags. > > This is part of a patch series aiming to remove the vmas parameter > altogether. > > Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> > Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org> > --- > arch/x86/kernel/cpu/sgx/ioctl.c | 2 +- > drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- > drivers/misc/sgi-gru/grufault.c | 2 +- > include/linux/mm.h | 3 +-- > mm/gup.c | 9 +++------ > mm/gup_test.c | 5 ++--- > virt/kvm/kvm_main.c | 4 ++-- > 7 files changed, 11 insertions(+), 16 deletions(-) Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Jason
diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index 21ca0a831b70..5d390df21440 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -214,7 +214,7 @@ static int __sgx_encl_add_page(struct sgx_encl *encl, if (!(vma->vm_flags & VM_MAYEXEC)) return -EACCES; - ret = get_user_pages(src, 1, 0, &src_page, NULL); + ret = get_user_pages(src, 1, 0, &src_page); if (ret < 1) return -EFAULT; diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 1e8e287e113c..0597540f0dde 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -362,7 +362,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm struct page **pages = ttm->pages + pinned; r = get_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0, - pages, NULL); + pages); if (r < 0) goto release_pages; diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c index b836936e9747..378cf02a2aa1 100644 --- a/drivers/misc/sgi-gru/grufault.c +++ b/drivers/misc/sgi-gru/grufault.c @@ -185,7 +185,7 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma, #else *pageshift = PAGE_SHIFT; #endif - if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0) + if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page) <= 0) return -EFAULT; *paddr = page_to_phys(page); put_page(page); diff --git a/include/linux/mm.h b/include/linux/mm.h index 5d5ba1556ae9..faeed36c2d04 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2380,8 +2380,7 @@ long pin_user_pages_remote(struct mm_struct *mm, unsigned int gup_flags, struct page **pages, struct vm_area_struct **vmas, int *locked); long get_user_pages(unsigned long start, unsigned long nr_pages, - unsigned int gup_flags, struct page **pages, - struct vm_area_struct **vmas); + unsigned int gup_flags, struct page **pages); long pin_user_pages(unsigned long start, unsigned long nr_pages, unsigned int gup_flags, struct page **pages, struct vm_area_struct **vmas); diff --git a/mm/gup.c b/mm/gup.c index 1f72a717232b..7e454d6b157e 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2251,8 +2251,6 @@ long get_user_pages_remote(struct mm_struct *mm, * @pages: array that receives pointers to the pages pinned. * Should be at least nr_pages long. Or NULL, if caller * only intends to ensure the pages are faulted in. - * @vmas: array of pointers to vmas corresponding to each page. - * Or NULL if the caller does not require them. * * This is the same as get_user_pages_remote(), just with a less-flexible * calling convention where we assume that the mm being operated on belongs to @@ -2260,16 +2258,15 @@ long get_user_pages_remote(struct mm_struct *mm, * obviously don't pass FOLL_REMOTE in here. */ long get_user_pages(unsigned long start, unsigned long nr_pages, - unsigned int gup_flags, struct page **pages, - struct vm_area_struct **vmas) + unsigned int gup_flags, struct page **pages) { int locked = 1; - if (!is_valid_gup_args(pages, vmas, NULL, &gup_flags, FOLL_TOUCH)) + if (!is_valid_gup_args(pages, NULL, NULL, &gup_flags, FOLL_TOUCH)) return -EINVAL; return __get_user_pages_locked(current->mm, start, nr_pages, pages, - vmas, &locked, gup_flags); + NULL, &locked, gup_flags); } EXPORT_SYMBOL(get_user_pages); diff --git a/mm/gup_test.c b/mm/gup_test.c index 8ae7307a1bb6..9ba8ea23f84e 100644 --- a/mm/gup_test.c +++ b/mm/gup_test.c @@ -139,8 +139,7 @@ static int __gup_test_ioctl(unsigned int cmd, pages + i); break; case GUP_BASIC_TEST: - nr = get_user_pages(addr, nr, gup->gup_flags, pages + i, - NULL); + nr = get_user_pages(addr, nr, gup->gup_flags, pages + i); break; case PIN_FAST_BENCHMARK: nr = pin_user_pages_fast(addr, nr, gup->gup_flags, @@ -161,7 +160,7 @@ static int __gup_test_ioctl(unsigned int cmd, pages + i, NULL); else nr = get_user_pages(addr, nr, gup->gup_flags, - pages + i, NULL); + pages + i); break; default: ret = -EINVAL; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d255964ec331..2d2446df0900 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2474,7 +2474,7 @@ static inline int check_user_page_hwpoison(unsigned long addr) { int rc, flags = FOLL_HWPOISON | FOLL_WRITE; - rc = get_user_pages(addr, 1, flags, NULL, NULL); + rc = get_user_pages(addr, 1, flags, NULL); return rc == -EHWPOISON; }
No invocation of get_user_pages() uses the vmas parameter, so remove it. The GUP API is confusing and caveated. Recent changes have done much to improve that, however there is more we can do. Exporting vmas is a prime target as the caller has to be extremely careful to preclude their use after the mmap_lock has expired or otherwise be left with dangling pointers. Removing the vmas parameter focuses the GUP functions upon their primary purpose - pinning (and outputting) pages as well as performing the actions implied by the input flags. This is part of a patch series aiming to remove the vmas parameter altogether. Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- arch/x86/kernel/cpu/sgx/ioctl.c | 2 +- drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- drivers/misc/sgi-gru/grufault.c | 2 +- include/linux/mm.h | 3 +-- mm/gup.c | 9 +++------ mm/gup_test.c | 5 ++--- virt/kvm/kvm_main.c | 4 ++-- 7 files changed, 11 insertions(+), 16 deletions(-)