- 06 Jan, 2022 24 commits
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Matthew Wilcox (Oracle) authored
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>
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Matthew Wilcox (Oracle) authored
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:
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Vlastimil Babka authored
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:
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Vlastimil Babka authored
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: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>
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Vlastimil Babka authored
Change cache_free_alien() to use slab_nid(virt_to_slab()). Otherwise just update of comments and some remaining variable names. Signed-off-by:
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Vlastimil Babka authored
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 authored
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:
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Vlastimil Babka authored
Update comments mentioning pages to mention slabs where appropriate. Also some goto labels. Signed-off-by:
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Vlastimil Babka authored
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: -
Matthew Wilcox (Oracle) authored
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:
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Vlastimil Babka authored
__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:
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Vlastimil Babka authored
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:
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Matthew Wilcox (Oracle) authored
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:
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Vlastimil Babka authored
These functions operate on the PG_locked page flag, but make them accept struct slab to encapsulate this implementation detail. Signed-off-by:
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Matthew Wilcox (Oracle) authored
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:
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Matthew Wilcox (Oracle) authored
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:
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Matthew Wilcox (Oracle) authored
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:
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Matthew Wilcox (Oracle) authored
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:
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Matthew Wilcox (Oracle) authored
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:
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Matthew Wilcox (Oracle) authored
This function is entirely self-contained, so can be converted from page to slab. Signed-off-by:
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Matthew Wilcox (Oracle) authored
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:
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Matthew Wilcox (Oracle) authored
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:
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Vlastimil Babka authored
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:
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Vlastimil Babka authored
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:
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- 20 Dec, 2021 1 commit
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Vlastimil Babka authored
These two wrappers around their respective struct page variants will be useful in the following patches. Signed-off-by:
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- 19 Dec, 2021 14 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds authored
Pull kvm fixes from Paolo Bonzini: "Two small fixes, one of which was being worked around in selftests" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: x86: Retry page fault if MMU reload is pending and root has no sp KVM: selftests: vmx_pmu_msrs_test: Drop tests mangling guest visible CPUIDs KVM: x86: Drop guest CPUID check for host initiated writes to MSR_IA32_PERF_CAPABILITIES
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git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull block revert from Jens Axboe: "It turns out that the fix for not hammering on the delayed work timer too much caused a performance regression for BFQ, so let's revert the change for now. I've got some ideas on how to fix it appropriately, but they should wait for 5.17" * tag 'block-5.16-2021-12-19' of git://git.kernel.dk/linux-block: Revert "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull irq fixes from Borislav Petkov: - Clear the PCI_MSIX_FLAGS_MASKALL bit too on the error path so that it is restored to its reset state - Mask MSI-X vectors late on the init path in order to handle out-of-spec Marvell NVME devices which apparently look at the MSI-X mask even when MSI-X is disabled * tag 'irq_urgent_for_v5.16_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: PCI/MSI: Clear PCI_MSIX_FLAGS_MASKALL on error PCI/MSI: Mask MSI-X vectors only on success
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull timer fix from Borislav Petkov: - Make sure the CLOCK_REALTIME to CLOCK_MONOTONIC offset is never positive * tag 'timers_urgent_for_v5.16_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: timekeeping: Really make sure wall_to_monotonic isn't positive
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull locking fix from Borislav Petkov: - Fix the rtmutex condition checking when the optimistic spinning of a waiter needs to be terminated * tag 'locking_urgent_for_v5.16_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/rtmutex: Fix incorrect condition in rtmutex_spin_on_owner()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull signal handlign fix from Borislav Petkov: - Prevent lock contention on the new sigaltstack lock on the common-case path, when no changes have been made to the alternative signal stack. * tag 'core_urgent_for_v5.16_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: signal: Skip the altstack update when not needed
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git://git.kernel.org/pub/scm/linux/kernel/git/mips/linuxLinus Torvalds authored
Pull MIPS fix from Thomas Bogendoerfer: - only enable pci_remap_iospace() for Ralink devices * tag 'mips-fixes_5.16_3' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: MIPS: Only define pci_remap_iospace() for Ralink
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds authored
Pull powerpc fixes from Michael Ellerman: "Fix a recently introduced oops at boot on 85xx in some configurations. Fix crashes when loading some livepatch modules with STRICT_MODULE_RWX. Thanks to Joe Lawrence, Russell Currey, and Xiaoming Ni" * tag 'powerpc-5.16-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/module_64: Fix livepatching for RO modules powerpc/85xx: Fix oops when CONFIG_FSL_PMC=n
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git://git.samba.org/sfrench/cifs-2.6Linus Torvalds authored
Pull cifs fixes from Steve French: "Two cifs/smb3 fixes, one fscache related, and one mount parsing related for stable" * tag '5.16-rc5-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6: cifs: sanitize multiple delimiters in prepath cifs: ignore resource_id while getting fscache super cookie
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Sean Christopherson authored
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: a955cad8 ("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>
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Vitaly Kuznetsov authored
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: feb627e8 ("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:
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Vitaly Kuznetsov authored
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: 27461da3 ("KVM: x86/pmu: Support full width counting") Suggested-by:
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Jens Axboe authored
This reverts commit cb2ac291. 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:
Jens Axboe <axboe@kernel.dk>
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- 18 Dec, 2021 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/ttyLinus Torvalds authored
Pull tty/serial fixes from Greg KH: "Here are two small tty/serial fixes for 5.16-rc6. They include: - n_hdlc fix for syzbot reported problem that you were previously copied on. - 8250_fintek driver fix that resolved a console problem by removing a previous change. Both have been in linux-next with no reported issues" * tag 'tty-5.16-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: serial: 8250_fintek: Fix garbled text for console tty: n_hdlc: make n_hdlc_tty_wakeup() asynchronous
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