- 16 Oct, 2020 40 commits
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Wei Yang authored
These two cases could be unified into one. Signed-off-by:
Wei Yang <richard.weiyang@linux.alibaba.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lkml.kernel.org/r/20200807085837.11697-2-richard.weiyang@linux.alibaba.comSigned-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Tobias Jordan authored
Whether crc32_be needs a lookup table is chosen based on CRC_LE_BITS. Obviously, the _be function should be governed by the _BE_ define. This probably never pops up as it's hard to come up with a configuration where CRC_BE_BITS isn't the same as CRC_LE_BITS and as nobody is using bitwise CRC anyway. Fixes: 46c5801e ("crc32: bolt on crc32c") Signed-off-by:
Tobias Jordan <kernel@cdqe.de> Signed-off-by:
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Dan Carpenter authored
This is supposed to return false on failure, not a negative error code. Fixes: 170e38548b81 ("mm/hmm/test: use after free in dmirror_allocate_chunk()") Signed-off-by:Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Ralph Campbell <rcampbell@nvidia.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Dan Williams <dan.j.williams@intel.com> Link: https://lkml.kernel.org/r/20201010200812.GA1886610@mwandaSigned-off-by:
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Andy Shevchenko authored
Add a macro to test if entry is pointing to the head of the list which is useful in cases like: list_for_each_entry(pos, &head, member) { if (cond) break; } if (list_entry_is_head(pos, &head, member)) return -ERRNO; that allows to avoid additional variable to be added to track if loop has not been stopped in the middle. While here, convert list_for_each_entry*() family of macros to use a new one. Signed-off-by:Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
Cezary Rojewski <cezary.rojewski@intel.com> Link: https://lkml.kernel.org/r/20200929134342.51489-1-andriy.shevchenko@linux.intel.comSigned-off-by:
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Miaohe Lin authored
Use helper macro abs() to simplify the "x >= t || x <= -t" cmp. Signed-off-by:
Miaohe Lin <linmiaohe@huawei.com> Signed-off-by:
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Christophe JAILLET authored
'sgl' is zeroed a few lines below in 'sg_init_table()'. There is no need to clear it twice. Remove the redundant initialization. Signed-off-by:
Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by:
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Stephen Boyd authored
These two functions are deprecated. Users should call ida_alloc() or ida_free() respectively instead. Add documentation to this effect until the macro can be removed. Signed-off-by:
Stephen Boyd <swboyd@chromium.org> Signed-off-by:
Tri Vo <trong@android.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox <willy@infradead.org> Link: https://lkml.kernel.org/r/20200910055246.2297797-2-swboyd@chromium.orgSigned-off-by:
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Stephen Boyd authored
The documentation for these functions indicates that callers don't need to hold a lock while calling them, but that documentation is only in one place under "IDA Usage". Let's state the same information on each IDA function so that it's clear what the calling context requires. Furthermore, let's document ida_simple_get() with the same information so that callers know how this API works. Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Tri Vo <trong@android.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox <willy@infradead.org> Link: https://lkml.kernel.org/r/20200910055246.2297797-1-swboyd@chromium.orgSigned-off-by:
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Randy Dunlap authored
Fix typo/spello of "functions". Signed-off-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "the". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "the". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "be". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "the". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "the". Fix spelling of "excess". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "how". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "the". Signed-off-by:
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Randy Dunlap authored
Drop the repeated word "an". Signed-off-by:
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Jarkko Sakkinen authored
Use @kernel.org address as the main communications end point. Update the corresponding M-entries and .mailmap (for git shortlog translation). Signed-off-by:
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by:
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Joe Perches authored
MAINTAINERS files generally have no specific maintainer but are updated by individuals for subsystems all over the source tree. Exclude MAINTAINERS file(s) from --git-fallback searches so the unlucky individuals that update the files the most are not shown by default. Signed-off-by:
Joe Perches <joe@perches.com> Signed-off-by:
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Joe Perches authored
It's somewhat common for me to ask get_maintainer to tell me who maintains a patch file rather than the files modified by the patch. Emit a warning if using get_maintainer.pl -f <patchfile> Signed-off-by:
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Randy Dunlap authored
Fix kernel-doc notation to use the documented Returns: syntax and place the function description for acct_process() on the first line where it should be. Signed-off-by:
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Randy Dunlap authored
Fix multiple occurrences of duplicated words in kernel/. Fix one typo/spello on the same line as a duplicate word. Change one instance of "the the" to "that the". Otherwise just drop one of the repeated words. Signed-off-by:
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Liao Pingfang authored
Replace do_brk with do_brk_flags in comment of prctl_set_mm_map(), since do_brk was removed in following commit. Fixes: bb177a73 ("mm: do not bug_on on incorrect length in __mm_populate()") Signed-off-by:
Liao Pingfang <liao.pingfang@zte.com.cn> Signed-off-by:
Yi Wang <wang.yi59@zte.com.cn> Signed-off-by:
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Andy Shevchenko authored
kernel.h is being used as a dump for all kinds of stuff for a long time. Here is the attempt to start cleaning it up by splitting out min()/max() et al. helpers. At the same time convert users in header and lib folder to use new header. Though for time being include new header back to kernel.h to avoid twisted indirected includes for other existing users. Signed-off-by:
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Randy Dunlap authored
Drop duplicated words {the, that} in comments. Signed-off-by: -
Matthew Wilcox (Oracle) authored
The current page_order() can only be called on pages in the buddy allocator. For compound pages, you have to use compound_order(). This is confusing and led to a bug, so rename page_order() to buddy_order(). Signed-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by:
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Mike Rapoport authored
The early_pfn_valid() macro is defined but it is never used. Remove it. Signed-off-by:
Mike Rapoport <rppt@linux.ibm.com> Signed-off-by:
David Hildenbrand <david@redhat.com> Link: https://lkml.kernel.org/r/20200923162915.26935-1-rppt@kernel.orgSigned-off-by:
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Miaohe Lin authored
In commit 1da177e4 ("Linux-2.6.12-rc2"), the helper put_write_access() came with the atomic_dec operation of the i_writecount field. But it forgot to use this helper in __vma_link_file() and dup_mmap(). Signed-off-by:
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Xiaofei Tan authored
Fix following warnings caused by mismatch bewteen function parameters and comments. mm/workingset.c:228: warning: Function parameter or member 'lruvec' not described in 'workingset_age_nonresident' mm/workingset.c:228: warning: Excess function parameter 'memcg' description in 'workingset_age_nonresident' Signed-off-by:
Xiaofei Tan <tanxiaofei@huawei.com> Signed-off-by:
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Chen Tao authored
Correct one function name "get_partials" with "get_partial". Update the old struct name of list3 with kmem_cache_node. Signed-off-by:
Chen Tao <chentao3@hotmail.com> Signed-off-by:
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Miaohe Lin authored
Fix some broken comments including typo, grammar error and wrong function name. Signed-off-by:
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Yu Zhao authored
Signed-off-by:
Yu Zhao <yuzhao@google.com> Signed-off-by:
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Ira Weiny authored
The #endif at the end of the file matches up with the '#if defined(HASHED_PAGE_VIRTUAL)' on line 374. Not the CONFIG_HIGHMEM #if earlier. Fix comments on both of the #endif's to indicate the correct end of blocks for each. Signed-off-by:
Ira Weiny <ira.weiny@intel.com> Signed-off-by:
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Wei Yang authored
list_for_each_entry_safe() guarantees that we will never stumble over the list head; "&page->lru != list" will always evaluate to true. Let's simplify. [david@redhat.com: Changelog refinements] Signed-off-by:
Alexander Duyck <alexander.h.duyck@linux.intel.com> Link: http://lkml.kernel.org/r/20200818084448.33969-1-richard.weiyang@linux.alibaba.comSigned-off-by:
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YueHaibing authored
Remove duplicate header which is included twice. Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Signed-off-by:
Pekka Enberg <penberg@kernel.org> Link: http://lkml.kernel.org/r/20200818114323.58156-1-yuehaibing@huawei.comSigned-off-by:
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Douglas Anderson authored
If we fail to decompress in zram it's a pretty serious problem. We were entrusted to be able to decompress the old data but we failed. Either we've got some crazy bug in the compression code or we've got memory corruption. At the moment, when this happens the log looks like this: ERR kernel: [ 1833.099861] zram: Decompression failed! err=-22, page=336112 ERR kernel: [ 1833.099881] zram: Decompression failed! err=-22, page=336112 ALERT kernel: [ 1833.099886] Read-error on swap-device (253:0:2688896) It is true that we have an "ALERT" level log in there, but (at least to me) it feels like even this isn't enough to impart the seriousness of this error. Let's convert to a WARN_ON. Note that WARN_ON is automatically "unlikely" so we can simply replace the old annotation with the new one. Signed-off-by:
Douglas Anderson <dianders@chromium.org> Signed-off-by:
Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Sonny Rao <sonnyrao@chromium.org> Cc: Jens Axboe <axboe@kernel.dk> Link: https://lkml.kernel.org/r/20200917174059.1.If09c882545dbe432268f7a67a4d4cfcb6caace4f@changeidSigned-off-by:
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David Hildenbrand authored
As we no longer shuffle via generic_online_page() and when undoing isolation, we can simplify the comment. We now effectively shuffle only once (properly) when onlining new memory. Signed-off-by:
Michal Hocko <mhocko@suse.com> Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Mike Rapoport <rppt@kernel.org> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Scott Cheloha <cheloha@linux.ibm.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: Wei Liu <wei.liu@kernel.org> Link: https://lkml.kernel.org/r/20201005121534.15649-6-david@redhat.comSigned-off-by:
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David Hildenbrand authored
__free_pages_core() is used when exposing fresh memory to the buddy during system boot and when onlining memory in generic_online_page(). generic_online_page() is used in two cases: 1. Direct memory onlining in online_pages(). 2. Deferred memory onlining in memory-ballooning-like mechanisms (HyperV balloon and virtio-mem), when parts of a section are kept fake-offline to be fake-onlined later on. In 1, we already place pages to the tail of the freelist. Pages will be freed to MIGRATE_ISOLATE lists first and moved to the tail of the freelists via undo_isolate_page_range(). In 2, we currently don't implement a proper rule. In case of virtio-mem, where we currently always online MAX_ORDER - 1 pages, the pages will be placed to the HEAD of the freelist - undesireable. While the hyper-v balloon calls generic_online_page() with single pages, usually it will call it on successive single pages in a larger block. The pages are fresh, so place them to the tail of the freelist and avoid the PCP. In __free_pages_core(), remove the now superflouos call to set_page_refcounted() and add a comment regarding page initialization and the refcount. Note: In 2. we currently don't shuffle. If ever relevant (page shuffling is usually of limited use in virtualized environments), we might want to shuffle after a sequence of generic_online_page() calls in the relevant callers. Signed-off-by:
Vlastimil Babka <vbabka@suse.cz> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Reviewed-by:
Pankaj Gupta <pankaj.gupta.linux@gmail.com> Acked-by:
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David Hildenbrand authored
Whenever we move pages between freelists via move_to_free_list()/ move_freepages_block(), we don't actually touch the pages: 1. Page isolation doesn't actually touch the pages, it simply isolates pageblocks and moves all free pages to the MIGRATE_ISOLATE freelist. When undoing isolation, we move the pages back to the target list. 2. Page stealing (steal_suitable_fallback()) moves free pages directly between lists without touching them. 3. reserve_highatomic_pageblock()/unreserve_highatomic_pageblock() moves free pages directly between freelists without touching them. We already place pages to the tail of the freelists when undoing isolation via __putback_isolated_page(), let's do it in any case (e.g., if order <= pageblock_order) and document the behavior. To simplify, let's move the pages to the tail for all move_to_free_list()/move_freepages_block() users. In 2., the target list is empty, so there should be no change. In 3., we might observe a change, however, highatomic is more concerned about allocations succeeding than cache hotness - if we ever realize this change degrades a workload, we can special-case this instance and add a proper comment. This change results in all pages getting onlined via online_pages() to be placed to the tail of the freelist. Signed-off-by:
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David Hildenbrand authored
__putback_isolated_page() already documents that pages will be placed to the tail of the freelist - this is, however, not the case for "order >= MAX_ORDER - 2" (see buddy_merge_likely()) - which should be the case for all existing users. This change affects two users: - free page reporting - page isolation, when undoing the isolation (including memory onlining). This behavior is desirable for pages that haven't really been touched lately, so exactly the two users that don't actually read/write page content, but rather move untouched pages. The new behavior is especially desirable for memory onlining, where we allow allocation of newly onlined pages via undo_isolate_page_range() in online_pages(). Right now, we always place them to the head of the freelist, resulting in undesireable behavior: Assume we add individual memory chunks via add_memory() and online them right away to the NORMAL zone. We create a dependency chain of unmovable allocations e.g., via the memmap. The memmap of the next chunk will be placed onto previous chunks - if the last block cannot get offlined+removed, all dependent ones cannot get offlined+removed. While this can already be observed with individual DIMMs, it's more of an issue for virtio-mem (and I suspect also ppc DLPAR). Document that this should only be used for optimizations, and no code should rely on this behavior for correction (if the order of the freelists ever changes). We won't care about page shuffling: memory onlining already properly shuffles after onlining. free page reporting doesn't care about physically contiguous ranges, and there are already cases where page isolation will simply move (physically close) free pages to (currently) the head of the freelists via move_freepages_block() instead of shuffling. If this becomes ever relevant, we should shuffle the whole zone when undoing isolation of larger ranges, and after free_contig_range(). Signed-off-by:
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