kernel/linux.git/include/linux/percpu.h, branch linux-6.5.y

Merge tag 'core_guards_for_6.5_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue

2023-07-04T20:50:38+00:00

Pull scope-based resource management infrastructure from Peter Zijlstra: "These are the first few patches in the Scope-based Resource Management series that introduce the infrastructure but not any conversions as of yet. Adding the infrastructure now allows multiple people to start using them. Of note is that Sparse will need some work since it doesn't yet understand this attribute and might have decl-after-stmt issues" * tag 'core_guards_for_6.5_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue: kbuild: Drop -Wdeclaration-after-statement locking: Introduce __cleanup() based infrastructure apparmor: Free up __cleanup() name dmaengine: ioat: Free up __cleanup() name

locking: Introduce __cleanup() based infrastructure

2023-06-26T09:14:18+00:00

Use __attribute__((__cleanup__(func))) to build: - simple auto-release pointers using __free() - 'classes' with constructor and destructor semantics for scope-based resource management. - lock guards based on the above classes. Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20230612093537.614161713%40infradead.org

mm: percpu: unhide pcpu_embed_first_chunk prototype

2023-06-10T00:44:14+00:00

Patch series "mm/init/kernel: missing-prototypes warnings". These are patches addressing -Wmissing-prototypes warnings in common kernel code and memory management code files that usually get merged through the -mm tree. This patch (of 12): This function is called whenever CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK or CONFIG_HAVE_SETUP_PER_CPU_AREA, but only declared when the former is set: mm/percpu.c:3055:12: error: no previous prototype for 'pcpu_embed_first_chunk' [-Werror=missing-prototypes] There is no real point in hiding declarations, so just remove the #ifdef here. Link: https://lkml.kernel.org/r/20230517131102.934196-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20230517131102.934196-2-arnd@kernel.org Signed-off-by: Arnd Bergmann Cc: Boqun Feng Cc: Catalin Marinas Cc: Christoph Lameter Cc: Dennis Zhou Cc: Eric Paris Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Paul Moore Cc: Pavel Machek Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Russell King Cc: Tejun Heo Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Waiman Long Cc: Will Deacon Signed-off-by: Andrew Morton

Merge branch 'for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu

2022-12-13T00:07:04+00:00

Pull percpu updates from Dennis Zhou: "Baoquan was nice enough to run some clean ups for percpu" * 'for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu: mm/percpu: remove unused PERCPU_DYNAMIC_EARLY_SLOTS mm/percpu.c: remove the lcm code since block size is fixed at page size mm/percpu: replace the goto with break mm/percpu: add comment to state the empty populated pages accounting mm/percpu: Update the code comment when creating new chunk mm/percpu: use list_first_entry_or_null in pcpu_reclaim_populated() mm/percpu: remove unused pcpu_map_extend_chunks

percpu: adjust the value of PERCPU_DYNAMIC_EARLY_SIZE

2022-11-21T09:19:25+00:00

LKP reported a build failure as below on the following patch "mm/slub, percpu: correct the calculation of early percpu allocation size" ~~~~~~ In file included from : In function 'alloc_kmem_cache_cpus', inlined from 'kmem_cache_open' at mm/slub.c:4340:6: >> >> include/linux/compiler_types.h:357:45: error: call to '__compiletime_assert_474' declared with attribute error: BUILD_BUG_ON failed: PERCPU_DYNAMIC_EARLY_SIZE < NR_KMALLOC_TYPES * KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu) 357 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ~~~~~~ From the kernel config file provided by LKP, the building was made on arm64 with below Kconfig item enabled: CONFIG_ZONE_DMA=y CONFIG_SLUB_CPU_PARTIAL=y CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_SLUB_STATS=y CONFIG_ARM64_PAGE_SHIFT=16 CONFIG_ARM64_64K_PAGES=y Then we will have: NR_KMALLOC_TYPES:4 KMALLOC_SHIFT_HIGH:17 sizeof(struct kmem_cache_cpu):184 The product of them is 12512, which is bigger than PERCPU_DYNAMIC_EARLY_SIZE, 12K. Hence, the BUILD_BUG_ON in alloc_kmem_cache_cpus() is triggered. Earlier, in commit 099a19d91ca4 ("percpu: allow limited allocation before slab is online"), PERCPU_DYNAMIC_EARLY_SIZE was introduced and set to 12K which is equal to the then PERPCU_DYNAMIC_RESERVE. Later, in commit 1a4d76076cda ("percpu: implement asynchronous chunk population"), PERPCU_DYNAMIC_RESERVE was increased by 8K, while PERCPU_DYNAMIC_EARLY_SIZE was kept unchanged. So, here increase PERCPU_DYNAMIC_EARLY_SIZE by 8K too to accommodate to the slub's requirement. Reported-by: kernel test robot Signed-off-by: Baoquan He Acked-by: Dennis Zhou Signed-off-by: Vlastimil Babka

mm/percpu: remove unused PERCPU_DYNAMIC_EARLY_SLOTS

2022-11-08T06:59:28+00:00

Since commit 40064aeca35c ("percpu: replace area map allocator with bitmap"), there's no place to use PERCPU_DYNAMIC_EARLY_SLOTS. So clean it up. Signed-off-by: Baoquan He Signed-off-by: Dennis Zhou

mm: percpu: add generic pcpu_populate_pte() function

2022-01-20T06:52:52+00:00

With NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to populate pte, this patch adds a generic pcpu populate pte function, pcpu_populate_pte(), which is marked __weak and used on most architectures, but it is overridden on x86, which has its own implementation. Link: https://lkml.kernel.org/r/20211216112359.103822-5-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: "David S. Miller" Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: Albert Ou Cc: Catalin Marinas Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Thomas Bogendoerfer Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: percpu: add generic pcpu_fc_alloc/free funciton

2022-01-20T06:52:52+00:00

With the previous patch, we could add a generic pcpu first chunk allocate and free function to cleanup the duplicated definations on each architecture. Link: https://lkml.kernel.org/r/20211216112359.103822-4-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Cc: Thomas Bogendoerfer Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: "David S. Miller" Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Greg Kroah-Hartman Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: Albert Ou Cc: Catalin Marinas Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: "Rafael J. Wysocki" Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: percpu: add pcpu_fc_cpu_to_node_fn_t typedef

2022-01-20T06:52:52+00:00

Add pcpu_fc_cpu_to_node_fn_t and pass it into pcpu_fc_alloc_fn_t, pcpu first chunk allocation will call it to alloc memblock on the corresponding node by it, this is prepare for the next patch. Link: https://lkml.kernel.org/r/20211216112359.103822-3-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Cc: Thomas Bogendoerfer Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: "David S. Miller" Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: Albert Ou Cc: Catalin Marinas Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge tag 'printk-for-5.16-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

2021-11-18T18:50:45+00:00

Pull printk fixes from Petr Mladek: - Try to flush backtraces from other CPUs also on the local one. This was a regression caused by printk_safe buffers removal. - Remove header dependency warning. * tag 'printk-for-5.16-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printk: Remove printk.h inclusion in percpu.h printk: restore flushing of NMI buffers on remote CPUs after NMI backtraces