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2022-01-06bootmem: Use page->index instead of page->freelistMatthew Wilcox (Oracle)4-7/+6
page->freelist is for the use of slab. Using page->index is the same set of bits as page->freelist, and by using an integer instead of a pointer, we can avoid casts. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: <x86@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com>
2022-01-06zsmalloc: Stop using slab fields in struct pageMatthew Wilcox (Oracle)1-9/+9
The ->freelist and ->units members of struct page are for the use of slab only. I'm not particularly familiar with zsmalloc, so generate the same code by using page->index to store 'page' (page->index and page->freelist are at the same offset in struct page). This should be cleaned up properly at some point by somebody who is familiar with zsmalloc. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Minchan Kim <minchan@kernel.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
2022-01-06mm/slub: Define struct slab fields for CONFIG_SLUB_CPU_PARTIAL only when enabledVlastimil Babka2-2/+8
The fields 'next' and 'slabs' are only used when CONFIG_SLUB_CPU_PARTIAL is enabled. We can put their definition to #ifdef to prevent accidental use when disabled. Currenlty show_slab_objects() and slabs_cpu_partial_show() contain code accessing the slabs field that's effectively dead with CONFIG_SLUB_CPU_PARTIAL=n through the wrappers slub_percpu_partial() and slub_percpu_partial_read_once(), but to prevent a compile error, we need to hide all this code behind #ifdef. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Roman Gushchin <guro@fb.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/slub: Simplify struct slab slabs field definitionVlastimil Babka1-4/+0
Before commit b47291ef02b0 ("mm, slub: change percpu partial accounting from objects to pages") we had to fit two integer fields into a native word size, so we used short int on 32-bit and int on 64-bit via #ifdef. After that commit there is only one integer field, so we can simply define it as int everywhere. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/sl*b: Differentiate struct slab fields by sl*b implementationsVlastimil Babka2-14/+43
With a struct slab definition separate from struct page, we can go further and define only fields that the chosen sl*b implementation uses. This means everything between __page_flags and __page_refcount placeholders now depends on the chosen CONFIG_SL*B. Some fields exist in all implementations (slab_list) but can be part of a union in some, so it's simpler to repeat them than complicate the definition with ifdefs even more. The patch doesn't change physical offsets of the fields, although it could be done later - for example it's now clear that tighter packing in SLOB could be possible. This should also prevent accidental use of fields that don't exist in given implementation. Before this patch virt_to_cache() and cache_from_obj() were visible for SLOB (albeit not used), although they rely on the slab_cache field that isn't set by SLOB. With this patch it's now a compile error, so these functions are now hidden behind an #ifndef CONFIG_SLOB. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Tested-by: Marco Elver <elver@google.com> # kfence Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Marco Elver <elver@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: <kasan-dev@googlegroups.com>
2022-01-06mm/kfence: Convert kfence_guarded_alloc() to struct slabVlastimil Babka2-9/+9
The function sets some fields that are being moved from struct page to struct slab so it needs to be converted. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Tested-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Marco Elver <elver@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: <kasan-dev@googlegroups.com>
2022-01-06mm/kasan: Convert to struct folio and struct slabMatthew Wilcox (Oracle)9-28/+42
KASAN accesses some slab related struct page fields so we need to convert it to struct slab. Some places are a bit simplified thanks to kasan_addr_to_slab() encapsulating the PageSlab flag check through virt_to_slab(). When resolving object address to either a real slab or a large kmalloc, use struct folio as the intermediate type for testing the slab flag to avoid unnecessary implicit compound_head(). [ vbabka@suse.cz: use struct folio, adjust to differences in previous patches ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Reviewed-by: Roman Gushchin <guro@fb.com> Tested-by: Hyeongogn Yoo <42.hyeyoo@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: <kasan-dev@googlegroups.com>
2022-01-06mm/slob: Convert SLOB to use struct slab and struct folioMatthew Wilcox (Oracle)1-24/+27
Use struct slab throughout the slob allocator. Where non-slab page can appear use struct folio instead of struct page. [ vbabka@suse.cz: don't introduce wrappers for PageSlobFree in mm/slab.h just for the single callers being wrappers in mm/slob.c ] [ Hyeonggon Yoo <42.hyeyoo@gmail.com>: fix NULL pointer deference ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/memcg: Convert slab objcgs from struct page to struct slabVlastimil Babka3-96/+80
page->memcg_data is used with MEMCG_DATA_OBJCGS flag only for slab pages so convert all the related infrastructure to struct slab. Also use struct folio instead of struct page when resolving object pointers. This is not just mechanistic changing of types and names. Now in mem_cgroup_from_obj() we use folio_test_slab() to decide if we interpret the folio as a real slab instead of a large kmalloc, instead of relying on MEMCG_DATA_OBJCGS bit that used to be checked in page_objcgs_check(). Similarly in memcg_slab_free_hook() where we can encounter kmalloc_large() pages (here the folio slab flag check is implied by virt_to_slab()). As a result, page_objcgs_check() can be dropped instead of converted. To avoid include cycles, move the inline definition of slab_objcgs() from memcontrol.h to mm/slab.h. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: <cgroups@vger.kernel.org>
2022-01-06mm: Convert struct page to struct slab in functions used by other subsystemsVlastimil Babka11-34/+34
KASAN, KFENCE and memcg interact with SLAB or SLUB internals through functions nearest_obj(), obj_to_index() and objs_per_slab() that use struct page as parameter. This patch converts it to struct slab including all callers, through a coccinelle semantic patch. // Options: --include-headers --no-includes --smpl-spacing include/linux/slab_def.h include/linux/slub_def.h mm/slab.h mm/kasan/*.c mm/kfence/kfence_test.c mm/memcontrol.c mm/slab.c mm/slub.c // Note: needs coccinelle 1.1.1 to avoid breaking whitespace @@ @@ -objs_per_slab_page( +objs_per_slab( ... ) { ... } @@ @@ -objs_per_slab_page( +objs_per_slab( ... ) @@ identifier fn =~ "obj_to_index|objs_per_slab"; @@ fn(..., - const struct page *page + const struct slab *slab ,...) { <... ( - page_address(page) + slab_address(slab) | - page + slab ) ...> } @@ identifier fn =~ "nearest_obj"; @@ fn(..., - struct page *page + const struct slab *slab ,...) { <... ( - page_address(page) + slab_address(slab) | - page + slab ) ...> } @@ identifier fn =~ "nearest_obj|obj_to_index|objs_per_slab"; expression E; @@ fn(..., ( - slab_page(E) + E | - virt_to_page(E) + virt_to_slab(E) | - virt_to_head_page(E) + virt_to_slab(E) | - page + page_slab(page) ) ,...) Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Reviewed-by: Roman Gushchin <guro@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Julia Lawall <julia.lawall@inria.fr> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Marco Elver <elver@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: <kasan-dev@googlegroups.com> Cc: <cgroups@vger.kernel.org>
2022-01-06mm/slab: Finish struct page to struct slab conversionVlastimil Babka1-10/+10
Change cache_free_alien() to use slab_nid(virt_to_slab()). Otherwise just update of comments and some remaining variable names. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/slab: Convert most struct page to struct slab by spatchVlastimil Babka1-180/+180
The majority of conversion from struct page to struct slab in SLAB internals can be delegated to a coccinelle semantic patch. This includes renaming of variables with 'page' in name to 'slab', and similar. Big thanks to Julia Lawall and Luis Chamberlain for help with coccinelle. // Options: --include-headers --no-includes --smpl-spacing mm/slab.c // Note: needs coccinelle 1.1.1 to avoid breaking whitespace, and ocaml for the // embedded script // build list of functions for applying the next rule @initialize:ocaml@ @@ let ok_function p = not (List.mem (List.hd p).current_element ["kmem_getpages";"kmem_freepages"]) // convert the type in selected functions @@ position p : script:ocaml() { ok_function p }; @@ - struct page@p + struct slab @@ @@ -PageSlabPfmemalloc(page) +slab_test_pfmemalloc(slab) @@ @@ -ClearPageSlabPfmemalloc(page) +slab_clear_pfmemalloc(slab) @@ @@ obj_to_index( ..., - page + slab_page(slab) ,...) // for all functions, change any "struct slab *page" parameter to "struct slab // *slab" in the signature, and generally all occurences of "page" to "slab" in // the body - with some special cases. @@ identifier fn; expression E; @@ fn(..., - struct slab *page + struct slab *slab ,...) { <... ( - int page_node; + int slab_node; | - page_node + slab_node | - page_slab(page) + slab | - page_address(page) + slab_address(slab) | - page_size(page) + slab_size(slab) | - page_to_nid(page) + slab_nid(slab) | - virt_to_head_page(E) + virt_to_slab(E) | - page + slab ) ...> } // rename a function parameter @@ identifier fn; expression E; @@ fn(..., - int page_node + int slab_node ,...) { <... - page_node + slab_node ...> } // functions converted by previous rules that were temporarily called using // slab_page(E) so we want to remove the wrapper now that they accept struct // slab ptr directly @@ identifier fn =~ "index_to_obj"; expression E; @@ fn(..., - slab_page(E) + E ,...) // functions that were returning struct page ptr and now will return struct // slab ptr, including slab_page() wrapper removal @@ identifier fn =~ "cache_grow_begin|get_valid_first_slab|get_first_slab"; expression E; @@ fn(...) { <... - slab_page(E) + E ...> } // rename any former struct page * declarations @@ @@ struct slab * -page +slab ; // all functions (with exceptions) with a local "struct slab *page" variable // that will be renamed to "struct slab *slab" @@ identifier fn !~ "kmem_getpages|kmem_freepages"; expression E; @@ fn(...) { <... ( - page_slab(page) + slab | - page_to_nid(page) + slab_nid(slab) | - kasan_poison_slab(page) + kasan_poison_slab(slab_page(slab)) | - page_address(page) + slab_address(slab) | - page_size(page) + slab_size(slab) | - page->pages + slab->slabs | - page = virt_to_head_page(E) + slab = virt_to_slab(E) | - virt_to_head_page(E) + virt_to_slab(E) | - page + slab ) ...> } Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Julia Lawall <julia.lawall@inria.fr> Cc: Luis Chamberlain <mcgrof@kernel.org>
2022-01-06mm/slab: Convert kmem_getpages() and kmem_freepages() to struct slabVlastimil Babka1-25/+28
These functions sit at the boundary to page allocator. Also use folio internally to avoid extra compound_head() when dealing with page flags. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/slub: Finish struct page to struct slab conversionVlastimil Babka2-54/+53
Update comments mentioning pages to mention slabs where appropriate. Also some goto labels. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/slub: Convert most struct page to struct slab by spatchVlastimil Babka2-439/+439
The majority of conversion from struct page to struct slab in SLUB internals can be delegated to a coccinelle semantic patch. This includes renaming of variables with 'page' in name to 'slab', and similar. Big thanks to Julia Lawall and Luis Chamberlain for help with coccinelle. // Options: --include-headers --no-includes --smpl-spacing include/linux/slub_def.h mm/slub.c // Note: needs coccinelle 1.1.1 to avoid breaking whitespace, and ocaml for the // embedded script // build list of functions to exclude from applying the next rule @initialize:ocaml@ @@ let ok_function p = not (List.mem (List.hd p).current_element ["nearest_obj";"obj_to_index";"objs_per_slab_page";"__slab_lock";"__slab_unlock";"free_nonslab_page";"kmalloc_large_node"]) // convert the type from struct page to struct page in all functions except the // list from previous rule // this also affects struct kmem_cache_cpu, but that's ok @@ position p : script:ocaml() { ok_function p }; @@ - struct page@p + struct slab // in struct kmem_cache_cpu, change the name from page to slab // the type was already converted by the previous rule @@ @@ struct kmem_cache_cpu { ... -struct slab *page; +struct slab *slab; ... } // there are many places that use c->page which is now c->slab after the // previous rule @@ struct kmem_cache_cpu *c; @@ -c->page +c->slab @@ @@ struct kmem_cache { ... - unsigned int cpu_partial_pages; + unsigned int cpu_partial_slabs; ... } @@ struct kmem_cache *s; @@ - s->cpu_partial_pages + s->cpu_partial_slabs @@ @@ static void - setup_page_debug( + setup_slab_debug( ...) {...} @@ @@ - setup_page_debug( + setup_slab_debug( ...); // for all functions (with exceptions), change any "struct slab *page" // parameter to "struct slab *slab" in the signature, and generally all // occurences of "page" to "slab" in the body - with some special cases. @@ identifier fn !~ "free_nonslab_page|obj_to_index|objs_per_slab_page|nearest_obj"; @@ fn(..., - struct slab *page + struct slab *slab ,...) { <... - page + slab ...> } // similar to previous but the param is called partial_page @@ identifier fn; @@ fn(..., - struct slab *partial_page + struct slab *partial_slab ,...) { <... - partial_page + partial_slab ...> } // similar to previous but for functions that take pointer to struct page ptr @@ identifier fn; @@ fn(..., - struct slab **ret_page + struct slab **ret_slab ,...) { <... - ret_page + ret_slab ...> } // functions converted by previous rules that were temporarily called using // slab_page(E) so we want to remove the wrapper now that they accept struct // slab ptr directly @@ identifier fn =~ "slab_free|do_slab_free"; expression E; @@ fn(..., - slab_page(E) + E ,...) // similar to previous but for another pattern @@ identifier fn =~ "slab_pad_check|check_object"; @@ fn(..., - folio_page(folio, 0) + slab ,...) // functions that were returning struct page ptr and now will return struct // slab ptr, including slab_page() wrapper removal @@ identifier fn =~ "allocate_slab|new_slab"; expression E; @@ static -struct slab * +struct slab * fn(...) { <... - slab_page(E) + E ...> } // rename any former struct page * declarations @@ @@ struct slab * ( - page + slab | - partial_page + partial_slab | - oldpage + oldslab ) ; // this has to be separate from previous rule as page and page2 appear at the // same line @@ @@ struct slab * -page2 +slab2 ; // similar but with initial assignment @@ expression E; @@ struct slab * ( - page + slab | - flush_page + flush_slab | - discard_page + slab_to_discard | - page_to_unfreeze + slab_to_unfreeze ) = E; // convert most of struct page to struct slab usage inside functions (with // exceptions), including specific variable renames @@ identifier fn !~ "nearest_obj|obj_to_index|objs_per_slab_page|__slab_(un)*lock|__free_slab|free_nonslab_page|kmalloc_large_node"; expression E; @@ fn(...) { <... ( - int pages; + int slabs; | - int pages = E; + int slabs = E; | - page + slab | - flush_page + flush_slab | - partial_page + partial_slab | - oldpage->pages + oldslab->slabs | - oldpage + oldslab | - unsigned int nr_pages; + unsigned int nr_slabs; | - nr_pages + nr_slabs | - unsigned int partial_pages = E; + unsigned int partial_slabs = E; | - partial_pages + partial_slabs ) ...> } // this has to be split out from the previous rule so that lines containing // multiple matching changes will be fully converted @@ identifier fn !~ "nearest_obj|obj_to_index|objs_per_slab_page|__slab_(un)*lock|__free_slab|free_nonslab_page|kmalloc_large_node"; @@ fn(...) { <... ( - slab->pages + slab->slabs | - pages + slabs | - page2 + slab2 | - discard_page + slab_to_discard | - page_to_unfreeze + slab_to_unfreeze ) ...> } // after we simply changed all occurences of page to slab, some usages need // adjustment for slab-specific functions, or use slab_page() wrapper @@ identifier fn !~ "nearest_obj|obj_to_index|objs_per_slab_page|__slab_(un)*lock|__free_slab|free_nonslab_page|kmalloc_large_node"; @@ fn(...) { <... ( - page_slab(slab) + slab | - kasan_poison_slab(slab) + kasan_poison_slab(slab_page(slab)) | - page_address(slab) + slab_address(slab) | - page_size(slab) + slab_size(slab) | - PageSlab(slab) + folio_test_slab(slab_folio(slab)) | - page_to_nid(slab) + slab_nid(slab) | - compound_order(slab) + slab_order(slab) ) ...> } Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Julia Lawall <julia.lawall@inria.fr> Cc: Luis Chamberlain <mcgrof@kernel.org>
2022-01-06mm/slub: Convert pfmemalloc_match() to take a struct slabMatthew Wilcox (Oracle)1-19/+6
Preparatory for mass conversion. Use the new slab_test_pfmemalloc() helper. As it doesn't do VM_BUG_ON(!PageSlab()) we no longer need the pfmemalloc_match_unsafe() variant. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/slub: Convert __free_slab() to use struct slabVlastimil Babka1-14/+13
__free_slab() is on the boundary of distinguishing struct slab and struct page so start with struct slab but convert to folio for working with flags and folio_page() to call functions that require struct page. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/slub: Convert alloc_slab_page() to return a struct slabVlastimil Babka1-10/+16
Preparatory, callers convert back to struct page for now. Also move setting page flags to alloc_slab_page() where we still operate on a struct page. This means the page->slab_cache pointer is now set later than the PageSlab flag, which could theoretically confuse some pfn walker assuming PageSlab means there would be a valid cache pointer. But as the code had no barriers and used __set_bit() anyway, it could have happened already, so there shouldn't be such a walker. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/slub: Convert print_page_info() to print_slab_info()Matthew Wilcox (Oracle)1-6/+7
Improve the type safety and prepare for further conversion. For flags access, convert to folio internally. [ vbabka@suse.cz: access flags via folio_flags() ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm/slub: Convert __slab_lock() and __slab_unlock() to struct slabVlastimil Babka1-7/+11
These functions operate on the PG_locked page flag, but make them accept struct slab to encapsulate this implementation detail. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/slub: Convert kfree() to use a struct slabMatthew Wilcox (Oracle)1-13/+16
Convert kfree(), kmem_cache_free() and ___cache_free() to resolve object addresses to struct slab, using folio as intermediate step where needed. Keep passing the result as struct page for now in preparation for mass conversion of internal functions. [ vbabka@suse.cz: Use folio as intermediate step when checking for large kmalloc pages, and when freeing them - rename free_nonslab_page() to free_large_kmalloc() that takes struct folio ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/slub: Convert detached_freelist to use a struct slabMatthew Wilcox (Oracle)1-14/+17
This gives us a little bit of extra typesafety as we know that nobody called virt_to_page() instead of virt_to_head_page(). [ vbabka@suse.cz: Use folio as intermediate step when filtering out large kmalloc pages ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm: Convert check_heap_object() to use struct slabMatthew Wilcox (Oracle)5-26/+30
Ensure that we're not seeing a tail page inside __check_heap_object() by converting to a slab instead of a page. Take the opportunity to mark the slab as const since we're not modifying it. Also move the declaration of __check_heap_object() to mm/slab.h so it's not available to the wider kernel. [ vbabka@suse.cz: in check_heap_object() only convert to struct slab for actual PageSlab pages; use folio as intermediate step instead of page ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm: Use struct slab in kmem_obj_info()Matthew Wilcox (Oracle)5-23/+24
All three implementations of slab support kmem_obj_info() which reports details of an object allocated from the slab allocator. By using the slab type instead of the page type, we make it obvious that this can only be called for slabs. [ vbabka@suse.cz: also convert the related kmem_valid_obj() to folios ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm: Convert __ksize() to struct slabMatthew Wilcox (Oracle)2-11/+9
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 <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm: Convert virt_to_cache() to use struct slabMatthew Wilcox (Oracle)1-4/+4
This function is entirely self-contained, so can be converted from page to slab. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2022-01-06mm: Convert [un]account_slab_page() to struct slabMatthew Wilcox (Oracle)3-13/+12
Convert the parameter of these functions to struct slab instead of struct page and drop _page from the names. For now their callers just convert page to slab. [ vbabka@suse.cz: replace existing functions instead of calling them ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm: Split slab into its own typeMatthew Wilcox (Oracle)3-9/+176
Make struct slab independent of struct page. It still uses the underlying memory in struct page for storing slab-specific data, but slab and slub can now be weaned off using struct page directly. Some of the wrapper functions (slab_address() and slab_order()) still need to cast to struct folio, but this is a significant disentanglement. [ vbabka@suse.cz: Rebase on folios, use folio instead of page where possible. Do not duplicate flags field in struct slab, instead make the related accessors go through slab_folio(). For testing pfmemalloc use the folio_*_active flag accessors directly so the PageSlabPfmemalloc wrappers can be removed later. Make folio_slab() expect only folio_test_slab() == true folios and virt_to_slab() return NULL when folio_test_slab() == false. Move struct slab to mm/slab.h. Don't represent with struct slab pages that are not true slab pages, but just a compound page obtained directly rom page allocator (with large kmalloc() for SLUB and SLOB). ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/slub: Make object_err() staticVlastimil Babka2-18/+15
There are no callers outside of mm/slub.c anymore. Move freelist_corrupted() that calls object_err() to avoid a need for forward declaration. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com>
2022-01-06mm/slab: Dissolve slab_map_pages() in its callerVlastimil Babka1-13/+2
The function no longer does what its name and comment suggests, and just sets two struct page fields, which can be done directly in its sole caller. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <guro@fb.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
2021-12-20iommu/iova: Temporarily include dma-mapping.h from iova.hJoerg Roedel1-0/+1
Some users of iova.h still expect that dma-mapping.h is also included. Re-add the include until these users are updated to fix compile failures in the iommu tree. Acked-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/20211220123448.19996-1-joro@8bytes.org Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu: Move flush queue data into iommu_dma_cookieRobin Murphy3-122/+95
Complete the move into iommu-dma by refactoring the flush queues themselves to belong to the DMA cookie rather than the IOVA domain. The refactoring may as well extend to some minor cosmetic aspects too, to help us stay one step ahead of the style police. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/24304722005bc6f144e2a1fdd865d1465722fc2e.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/iova: Move flush queue code to iommu-dmaRobin Murphy2-176/+176
Flush queues are specific to DMA ops, which are now handled exclusively by iommu-dma. As such, now that the historical artefacts from being shared directly with drivers have been cleaned up, move the flush queue code into iommu-dma itself to get it out of the way of other IOVA users. This is pure code movement with no functional change; refactoring to clean up the headers and definitions will follow. Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/1d9a1ee1392e96eaae5e6467181b3e83edfdfbad.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/iova: Consolidate flush queue codeRobin Murphy1-73/+58
Squash and simplify some of the freeing code, and move the init and free routines down into the rest of the flush queue code to obviate the forward declarations. Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/b0dd4565e6646b6489599d7a1eaa362c75f53c95.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/vt-d: Use put_pages_listMatthew Wilcox (Oracle)5-79/+45
page->freelist is for the use of slab. We already have the ability to free a list of pages in the core mm, but it requires the use of a list_head and for the pages to be chained together through page->lru. Switch the Intel IOMMU and IOVA code over to using free_pages_list(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> [rm: split from original patch, cosmetic tweaks, fix fq entries] Signed-off-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/2115b560d9a0ce7cd4b948bd51a2b7bde8fdfd59.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/amd: Use put_pages_listMatthew Wilcox (Oracle)1-32/+18
page->freelist is for the use of slab. We already have the ability to free a list of pages in the core mm, but it requires the use of a list_head and for the pages to be chained together through page->lru. Switch the AMD IOMMU code over to using free_pages_list(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> [rm: split from original patch, cosmetic tweaks] Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/73af128f651aaa1f38f69e586c66765a88ad2de0.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/amd: Simplify pagetable freeingRobin Murphy1-48/+34
For reasons unclear, pagetable freeing is an effectively recursive method implemented via an elaborate system of templated functions that turns out to account for 25% of the object file size. Implementing it using regular straightforward recursion makes the code simpler, and seems like a good thing to do before we work on it further. As part of that, also fix the types to avoid all the needless casting back and forth which just gets in the way. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/d3d00c9f3fa0df4756b867072c201e6e82f9ce39.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/iova: Squash flush_cb abstractionRobin Murphy3-26/+9
Once again, with iommu-dma now being the only flush queue user, we no longer need the extra level of indirection through flush_cb. Squash that and let the flush queue code call the domain method directly. This does mean temporarily having to carry an additional copy of the IOMMU domain pointer around instead, but only until a later patch untangles it again. Reviewed-by: John Garry <john.garry@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/e3f9b4acdd6640012ef4fbc819ac868d727b64a9.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/iova: Squash entry_dtor abstractionRobin Murphy3-51/+20
All flush queues are driven by iommu-dma now, so there is no need to abstract entry_dtor or its data any more. Squash the now-canonical implementation directly into the IOVA code to get it out of the way. Reviewed-by: John Garry <john.garry@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/2260f8de00ab5e0f9d2a1cf8978e6ae7cd4f182c.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20iommu/iova: Fix race between FQ timeout and teardownXiongfeng Wang1-2/+1
It turns out to be possible for hotplugging out a device to reach the stage of tearing down the device's group and default domain before the domain's flush queue has drained naturally. At this point, it is then possible for the timeout to expire just before the del_timer() call in free_iova_flush_queue(), such that we then proceed to free the FQ resources while fq_flush_timeout() is still accessing them on another CPU. Crashes due to this have been observed in the wild while removing NVMe devices. Close the race window by using del_timer_sync() to safely wait for any active timeout handler to finish before we start to free things. We already avoid any locking in free_iova_flush_queue() since the FQ is supposed to be inactive anyway, so the potential deadlock scenario does not apply. Fixes: 9a005a800ae8 ("iommu/iova: Add flush timer") Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> [ rm: rewrite commit message ] Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/0a365e5b07f14b7344677ad6a9a734966a8422ce.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-12-20mm: add virt_to_folio() and folio_address()Vlastimil Babka1-0/+12
These two wrappers around their respective struct page variants will be useful in the following patches. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Roman Gushchin <guro@fb.com>
2021-12-19Linux 5.16-rc6Linus Torvalds1-1/+1
2021-12-19KVM: x86: Retry page fault if MMU reload is pending and root has no spSean Christopherson1-1/+15
Play nice with a NULL shadow page when checking for an obsolete root in the page fault handler by flagging the page fault as stale if there's no shadow page associated with the root and KVM_REQ_MMU_RELOAD is pending. Invalidating memslots, which is the only case where _all_ roots need to be reloaded, requests all vCPUs to reload their MMUs while holding mmu_lock for lock. The "special" roots, e.g. pae_root when KVM uses PAE paging, are not backed by a shadow page. Running with TDP disabled or with nested NPT explodes spectaculary due to dereferencing a NULL shadow page pointer. Skip the KVM_REQ_MMU_RELOAD check if there is a valid shadow page for the root. Zapping shadow pages in response to guest activity, e.g. when the guest frees a PGD, can trigger KVM_REQ_MMU_RELOAD even if the current vCPU isn't using the affected root. I.e. KVM_REQ_MMU_RELOAD can be seen with a completely valid root shadow page. This is a bit of a moot point as KVM currently unloads all roots on KVM_REQ_MMU_RELOAD, but that will be cleaned up in the future. Fixes: a955cad84cda ("KVM: x86/mmu: Retry page fault if root is invalidated by memslot update") Cc: stable@vger.kernel.org Cc: Maxim Levitsky <mlevitsk@redhat.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20211209060552.2956723-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-12-19KVM: selftests: vmx_pmu_msrs_test: Drop tests mangling guest visible CPUIDsVitaly Kuznetsov1-17/+0
Host initiated writes to MSR_IA32_PERF_CAPABILITIES should not depend on guest visible CPUIDs and (incorrect) KVM logic implementing it is about to change. Also, KVM_SET_CPUID{,2} after KVM_RUN is now forbidden and causes test to fail. Reported-by: kernel test robot <oliver.sang@intel.com> Fixes: feb627e8d6f6 ("KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN") Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20211216165213.338923-2-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-12-19KVM: x86: Drop guest CPUID check for host initiated writes to MSR_IA32_PERF_CAPABILITIESVitaly Kuznetsov1-1/+1
The ability to write to MSR_IA32_PERF_CAPABILITIES from the host should not depend on guest visible CPUID entries, even if just to allow creating/restoring guest MSRs and CPUIDs in any sequence. Fixes: 27461da31089 ("KVM: x86/pmu: Support full width counting") Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20211216165213.338923-3-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-12-19Revert "block: reduce kblockd_mod_delayed_work_on() CPU consumption"Jens Axboe1-2/+0
This reverts commit cb2ac2912a9ca7d3d26291c511939a41361d2d83. Alex and the kernel test robot report that this causes a significant performance regression with BFQ. I can reproduce that result, so let's revert this one as we're close to -rc6 and we there's no point in trying to rush a fix. Link: https://lore.kernel.org/linux-block/1639853092.524jxfaem2.none@localhost/ Link: https://lore.kernel.org/lkml/20211219141852.GH14057@xsang-OptiPlex-9020/ Reported-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca> Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-12-18perf inject: Fix segfault due to perf_data__fd() without openAdrian Hunter1-3/+7
The fixed commit attempts to get the output file descriptor even if the file was never opened e.g. $ perf record uname Linux [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.002 MB perf.data (7 samples) ] $ perf inject -i perf.data --vm-time-correlation=dry-run Segmentation fault (core dumped) $ gdb --quiet perf Reading symbols from perf... (gdb) r inject -i perf.data --vm-time-correlation=dry-run Starting program: /home/ahunter/bin/perf inject -i perf.data --vm-time-correlation=dry-run [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. __GI___fileno (fp=0x0) at fileno.c:35 35 fileno.c: No such file or directory. (gdb) bt #0 __GI___fileno (fp=0x0) at fileno.c:35 #1 0x00005621e48dd987 in perf_data__fd (data=0x7fff4c68bd08) at util/data.h:72 #2 perf_data__fd (data=0x7fff4c68bd08) at util/data.h:69 #3 cmd_inject (argc=<optimized out>, argv=0x7fff4c69c1f0) at builtin-inject.c:1017 #4 0x00005621e4936783 in run_builtin (p=0x5621e4ee6878 <commands+600>, argc=4, argv=0x7fff4c69c1f0) at perf.c:313 #5 0x00005621e4897d5c in handle_internal_command (argv=<optimized out>, argc=<optimized out>) at perf.c:365 #6 run_argv (argcp=<optimized out>, argv=<optimized out>) at perf.c:409 #7 main (argc=4, argv=0x7fff4c69c1f0) at perf.c:539 (gdb) Fixes: 0ae03893623dd1dd ("perf tools: Pass a fd to perf_file_header__read_pipe()") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Riccardo Mancini <rickyman7@gmail.com> Cc: stable@vger.kernel.org Link: http://lore.kernel.org/lkml/20211213084829.114772-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-12-18perf inject: Fix segfault due to close without openAdrian Hunter1-1/+2
The fixed commit attempts to close inject.output even if it was never opened e.g. $ perf record uname Linux [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.002 MB perf.data (7 samples) ] $ perf inject -i perf.data --vm-time-correlation=dry-run Segmentation fault (core dumped) $ gdb --quiet perf Reading symbols from perf... (gdb) r inject -i perf.data --vm-time-correlation=dry-run Starting program: /home/ahunter/bin/perf inject -i perf.data --vm-time-correlation=dry-run [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007eff8afeef5b in _IO_new_fclose (fp=0x0) at iofclose.c:48 48 iofclose.c: No such file or directory. (gdb) bt #0 0x00007eff8afeef5b in _IO_new_fclose (fp=0x0) at iofclose.c:48 #1 0x0000557fc7b74f92 in perf_data__close (data=data@entry=0x7ffcdafa6578) at util/data.c:376 #2 0x0000557fc7a6b807 in cmd_inject (argc=<optimized out>, argv=<optimized out>) at builtin-inject.c:1085 #3 0x0000557fc7ac4783 in run_builtin (p=0x557fc8074878 <commands+600>, argc=4, argv=0x7ffcdafb6a60) at perf.c:313 #4 0x0000557fc7a25d5c in handle_internal_command (argv=<optimized out>, argc=<optimized out>) at perf.c:365 #5 run_argv (argcp=<optimized out>, argv=<optimized out>) at perf.c:409 #6 main (argc=4, argv=0x7ffcdafb6a60) at perf.c:539 (gdb) Fixes: 02e6246f5364d526 ("perf inject: Close inject.output on exit") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Riccardo Mancini <rickyman7@gmail.com> Cc: stable@vger.kernel.org Link: http://lore.kernel.org/lkml/20211213084829.114772-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-12-18perf expr: Fix missing check for return value of hashmap__new()Miaoqian Lin1-0/+5
The hashmap__new() function may return ERR_PTR(-ENOMEM) when malloc() fails, add IS_ERR() checking for ctx->ids. Signed-off-by: Miaoqian Lin <linmq006@gmail.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20211212062504.25841-1-linmq006@gmail.com [ s/kfree()/free()/ and add missing linux/err.h include ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-12-18locking/rtmutex: Fix incorrect condition in rtmutex_spin_on_owner()Zqiang1-1/+1
Optimistic spinning needs to be terminated when the spinning waiter is not longer the top waiter on the lock, but the condition is negated. It terminates if the waiter is the top waiter, which is defeating the whole purpose. Fixes: c3123c431447 ("locking/rtmutex: Dont dereference waiter lockless") Signed-off-by: Zqiang <qiang1.zhang@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20211217074207.77425-1-qiang1.zhang@intel.com
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