[PATCH v2 07/33] mm: Convert __ksize() to struct slab
From: Vlastimil Babka <hidden>
Date: 2021-12-01 18:19:19
Also in:
linux-patches
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
From: "Matthew Wilcox (Oracle)" <willy@infradead.org> In SLUB, use folios, and struct slab to access slab_cache field. In SLOB, use folios to properly resolve pointers beyond PAGE_SIZE offset of the object. [ vbabka@suse.cz: use folios, and only convert folio_test_slab() == true folios to struct slab ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <redacted> --- mm/slob.c | 8 ++++---- mm/slub.c | 12 +++++------- 2 files changed, 9 insertions(+), 11 deletions(-)
diff --git a/mm/slob.c b/mm/slob.c
index 03deee1e6a94..c8a4290012a6 100644
--- a/mm/slob.c
+++ b/mm/slob.c@@ -570,7 +570,7 @@ EXPORT_SYMBOL(kfree); /* can't use ksize for kmem_cache_alloc memory, only kmalloc */ size_t __ksize(const void *block) { - struct page *sp; + struct folio *folio; int align; unsigned int *m;
@@ -578,9 +578,9 @@ size_t __ksize(const void *block) if (unlikely(block == ZERO_SIZE_PTR)) return 0; - sp = virt_to_page(block); - if (unlikely(!PageSlab(sp))) - return page_size(sp); + folio = virt_to_folio(block); + if (unlikely(!folio_test_slab(folio))) + return folio_size(folio); align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); m = (unsigned int *)(block - align);
diff --git a/mm/slub.c b/mm/slub.c
index 8b172de26c67..6ae7c63cedc0 100644
--- a/mm/slub.c
+++ b/mm/slub.c@@ -4527,19 +4527,17 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page, size_t __ksize(const void *object) { - struct page *page; + struct folio *folio; if (unlikely(object == ZERO_SIZE_PTR)) return 0; - page = virt_to_head_page(object); + folio = virt_to_folio(object); - if (unlikely(!PageSlab(page))) { - WARN_ON(!PageCompound(page)); - return page_size(page); - } + if (unlikely(!folio_test_slab(folio))) + return folio_size(folio); - return slab_ksize(page->slab_cache); + return slab_ksize(folio_slab(folio)->slab_cache); } EXPORT_SYMBOL(__ksize);
--
2.33.1