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Message-ID: <202409250728.jWiBpk6e-lkp@intel.com>
Date: Wed, 25 Sep 2024 07:50:10 +0800
From: kernel test robot <lkp@...el.com>
To: Jeongjun Park <aha310510@...il.com>, dennis@...nel.org, tj@...nel.org,
cl@...ux.com
Cc: oe-kbuild-all@...ts.linux.dev, akpm@...ux-foundation.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Jeongjun Park <aha310510@...il.com>
Subject: Re: [PATCH] mm: percpu: fix typo to pcpu_alloc_noprof() description
Hi Jeongjun,
kernel test robot noticed the following build warnings:
[auto build test WARNING on akpm-mm/mm-everything]
url: https://github.com/intel-lab-lkp/linux/commits/Jeongjun-Park/mm-percpu-fix-typo-to-pcpu_alloc_noprof-description/20240924-232509
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20240924152412.118487-1-aha310510%40gmail.com
patch subject: [PATCH] mm: percpu: fix typo to pcpu_alloc_noprof() description
config: arc-randconfig-001-20240925 (https://download.01.org/0day-ci/archive/20240925/202409250728.jWiBpk6e-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240925/202409250728.jWiBpk6e-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409250728.jWiBpk6e-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> mm/percpu.c:1745: warning: expecting prototype for pcpu_alloc_noprof(). Prototype was for pcpu_alloc() instead
vim +1745 mm/percpu.c
60fa4a9e232317 Kent Overstreet 2024-03-21 1727
fbf59bc9d74d1f Tejun Heo 2009-02-20 1728 /**
f63f9cc5b5d1ea Jeongjun Park 2024-09-25 1729 * pcpu_alloc_noprof - the percpu allocator
cae3aeb83fef5a Tejun Heo 2009-02-21 1730 * @size: size of area to allocate in bytes
fbf59bc9d74d1f Tejun Heo 2009-02-20 1731 * @align: alignment of area (max PAGE_SIZE)
edcb463997ed7b Tejun Heo 2009-03-06 1732 * @reserved: allocate from the reserved chunk if available
5835d96e9ce4ef Tejun Heo 2014-09-02 1733 * @gfp: allocation flags
fbf59bc9d74d1f Tejun Heo 2009-02-20 1734 *
5835d96e9ce4ef Tejun Heo 2014-09-02 1735 * Allocate percpu area of @size bytes aligned at @align. If @gfp doesn't
0ea7eeec24be5f Daniel Borkmann 2017-10-17 1736 * contain %GFP_KERNEL, the allocation is atomic. If @gfp has __GFP_NOWARN
0ea7eeec24be5f Daniel Borkmann 2017-10-17 1737 * then no warning will be triggered on invalid or failed allocation
0ea7eeec24be5f Daniel Borkmann 2017-10-17 1738 * requests.
fbf59bc9d74d1f Tejun Heo 2009-02-20 1739 *
fbf59bc9d74d1f Tejun Heo 2009-02-20 1740 * RETURNS:
fbf59bc9d74d1f Tejun Heo 2009-02-20 1741 * Percpu pointer to the allocated area on success, NULL on failure.
fbf59bc9d74d1f Tejun Heo 2009-02-20 1742 */
24e44cc22aa311 Suren Baghdasaryan 2024-03-21 1743 void __percpu *pcpu_alloc_noprof(size_t size, size_t align, bool reserved,
5835d96e9ce4ef Tejun Heo 2014-09-02 1744 gfp_t gfp)
fbf59bc9d74d1f Tejun Heo 2009-02-20 @1745 {
28307d938fb2e4 Filipe Manana 2020-05-07 1746 gfp_t pcpu_gfp;
28307d938fb2e4 Filipe Manana 2020-05-07 1747 bool is_atomic;
28307d938fb2e4 Filipe Manana 2020-05-07 1748 bool do_warn;
3c7be18ac9a06b Roman Gushchin 2020-08-11 1749 struct obj_cgroup *objcg = NULL;
f2badb0c950ed3 Tejun Heo 2009-09-29 1750 static int warn_limit = 10;
8744d859427c61 Dennis Zhou 2019-02-25 1751 struct pcpu_chunk *chunk, *next;
f2badb0c950ed3 Tejun Heo 2009-09-29 1752 const char *err;
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1753) int slot, off, cpu, ret;
403a91b1659cb1 Jiri Kosina 2009-10-29 1754 unsigned long flags;
f528f0b8e53d73 Catalin Marinas 2011-09-26 1755 void __percpu *ptr;
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1756) size_t bits, bit_align;
fbf59bc9d74d1f Tejun Heo 2009-02-20 1757
28307d938fb2e4 Filipe Manana 2020-05-07 1758 gfp = current_gfp_context(gfp);
28307d938fb2e4 Filipe Manana 2020-05-07 1759 /* whitelisted flags that can be passed to the backing allocators */
28307d938fb2e4 Filipe Manana 2020-05-07 1760 pcpu_gfp = gfp & (GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
28307d938fb2e4 Filipe Manana 2020-05-07 1761 is_atomic = (gfp & GFP_KERNEL) != GFP_KERNEL;
28307d938fb2e4 Filipe Manana 2020-05-07 1762 do_warn = !(gfp & __GFP_NOWARN);
28307d938fb2e4 Filipe Manana 2020-05-07 1763
723ad1d90b5663 Al Viro 2014-03-06 1764 /*
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1765) * There is now a minimum allocation size of PCPU_MIN_ALLOC_SIZE,
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1766) * therefore alignment must be a minimum of that many bytes.
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1767) * An allocation may have internal fragmentation from rounding up
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1768) * of up to PCPU_MIN_ALLOC_SIZE - 1 bytes.
723ad1d90b5663 Al Viro 2014-03-06 1769 */
d2f3c3849461ba Dennis Zhou (Facebook 2017-07-24 1770) if (unlikely(align < PCPU_MIN_ALLOC_SIZE))
d2f3c3849461ba Dennis Zhou (Facebook 2017-07-24 1771) align = PCPU_MIN_ALLOC_SIZE;
723ad1d90b5663 Al Viro 2014-03-06 1772
d2f3c3849461ba Dennis Zhou (Facebook 2017-07-24 1773) size = ALIGN(size, PCPU_MIN_ALLOC_SIZE);
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1774) bits = size >> PCPU_MIN_ALLOC_SHIFT;
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1775) bit_align = align >> PCPU_MIN_ALLOC_SHIFT;
2f69fa829cb4ca Al Viro 2014-03-17 1776
3ca45a46f8af8c zijun_hu 2016-10-14 1777 if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE ||
3ca45a46f8af8c zijun_hu 2016-10-14 1778 !is_power_of_2(align))) {
0ea7eeec24be5f Daniel Borkmann 2017-10-17 1779 WARN(do_warn, "illegal size (%zu) or align (%zu) for percpu allocation\n",
756a025f000919 Joe Perches 2016-03-17 1780 size, align);
fbf59bc9d74d1f Tejun Heo 2009-02-20 1781 return NULL;
fbf59bc9d74d1f Tejun Heo 2009-02-20 1782 }
fbf59bc9d74d1f Tejun Heo 2009-02-20 1783
faf65dde844aff Roman Gushchin 2021-06-02 1784 if (unlikely(!pcpu_memcg_pre_alloc_hook(size, gfp, &objcg)))
3c7be18ac9a06b Roman Gushchin 2020-08-11 1785 return NULL;
3c7be18ac9a06b Roman Gushchin 2020-08-11 1786
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1787 if (!is_atomic) {
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1788 /*
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1789 * pcpu_balance_workfn() allocates memory under this mutex,
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1790 * and it may wait for memory reclaim. Allow current task
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1791 * to become OOM victim, in case of memory pressure.
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1792 */
3c7be18ac9a06b Roman Gushchin 2020-08-11 1793 if (gfp & __GFP_NOFAIL) {
6710e594f71cca Tejun Heo 2016-05-25 1794 mutex_lock(&pcpu_alloc_mutex);
3c7be18ac9a06b Roman Gushchin 2020-08-11 1795 } else if (mutex_lock_killable(&pcpu_alloc_mutex)) {
3c7be18ac9a06b Roman Gushchin 2020-08-11 1796 pcpu_memcg_post_alloc_hook(objcg, NULL, 0, size);
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1797 return NULL;
f52ba1fef7b92e Kirill Tkhai 2018-03-19 1798 }
3c7be18ac9a06b Roman Gushchin 2020-08-11 1799 }
6710e594f71cca Tejun Heo 2016-05-25 1800
403a91b1659cb1 Jiri Kosina 2009-10-29 1801 spin_lock_irqsave(&pcpu_lock, flags);
fbf59bc9d74d1f Tejun Heo 2009-02-20 1802
edcb463997ed7b Tejun Heo 2009-03-06 1803 /* serve reserved allocations from the reserved chunk if available */
edcb463997ed7b Tejun Heo 2009-03-06 1804 if (reserved && pcpu_reserved_chunk) {
edcb463997ed7b Tejun Heo 2009-03-06 1805 chunk = pcpu_reserved_chunk;
833af8427be4b2 Tejun Heo 2009-11-11 1806
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1807) off = pcpu_find_block_fit(chunk, bits, bit_align, is_atomic);
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1808) if (off < 0) {
833af8427be4b2 Tejun Heo 2009-11-11 1809 err = "alloc from reserved chunk failed";
ccea34b5d0fbab Tejun Heo 2009-03-07 1810 goto fail_unlock;
f2badb0c950ed3 Tejun Heo 2009-09-29 1811 }
833af8427be4b2 Tejun Heo 2009-11-11 1812
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1813) off = pcpu_alloc_area(chunk, bits, bit_align, off);
edcb463997ed7b Tejun Heo 2009-03-06 1814 if (off >= 0)
edcb463997ed7b Tejun Heo 2009-03-06 1815 goto area_found;
833af8427be4b2 Tejun Heo 2009-11-11 1816
f2badb0c950ed3 Tejun Heo 2009-09-29 1817 err = "alloc from reserved chunk failed";
ccea34b5d0fbab Tejun Heo 2009-03-07 1818 goto fail_unlock;
edcb463997ed7b Tejun Heo 2009-03-06 1819 }
edcb463997ed7b Tejun Heo 2009-03-06 1820
ccea34b5d0fbab Tejun Heo 2009-03-07 1821 restart:
edcb463997ed7b Tejun Heo 2009-03-06 1822 /* search through normal chunks */
f183324133ea53 Roman Gushchin 2021-04-07 1823 for (slot = pcpu_size_to_slot(size); slot <= pcpu_free_slot; slot++) {
faf65dde844aff Roman Gushchin 2021-06-02 1824 list_for_each_entry_safe(chunk, next, &pcpu_chunk_lists[slot],
faf65dde844aff Roman Gushchin 2021-06-02 1825 list) {
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1826) off = pcpu_find_block_fit(chunk, bits, bit_align,
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1827) is_atomic);
8744d859427c61 Dennis Zhou 2019-02-25 1828 if (off < 0) {
8744d859427c61 Dennis Zhou 2019-02-25 1829 if (slot < PCPU_SLOT_FAIL_THRESHOLD)
8744d859427c61 Dennis Zhou 2019-02-25 1830 pcpu_chunk_move(chunk, 0);
5835d96e9ce4ef Tejun Heo 2014-09-02 1831 continue;
8744d859427c61 Dennis Zhou 2019-02-25 1832 }
ccea34b5d0fbab Tejun Heo 2009-03-07 1833
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1834) off = pcpu_alloc_area(chunk, bits, bit_align, off);
f183324133ea53 Roman Gushchin 2021-04-07 1835 if (off >= 0) {
f183324133ea53 Roman Gushchin 2021-04-07 1836 pcpu_reintegrate_chunk(chunk);
fbf59bc9d74d1f Tejun Heo 2009-02-20 1837 goto area_found;
f183324133ea53 Roman Gushchin 2021-04-07 1838 }
fbf59bc9d74d1f Tejun Heo 2009-02-20 1839 }
fbf59bc9d74d1f Tejun Heo 2009-02-20 1840 }
fbf59bc9d74d1f Tejun Heo 2009-02-20 1841
403a91b1659cb1 Jiri Kosina 2009-10-29 1842 spin_unlock_irqrestore(&pcpu_lock, flags);
ccea34b5d0fbab Tejun Heo 2009-03-07 1843
11df02bf9bc1f6 Dennis Zhou 2017-06-21 1844 if (is_atomic) {
11df02bf9bc1f6 Dennis Zhou 2017-06-21 1845 err = "atomic alloc failed, no space left";
5835d96e9ce4ef Tejun Heo 2014-09-02 1846 goto fail;
11df02bf9bc1f6 Dennis Zhou 2017-06-21 1847 }
5835d96e9ce4ef Tejun Heo 2014-09-02 1848
e04cb6976340d5 Baoquan He 2022-10-24 1849 /* No space left. Create a new chunk. */
faf65dde844aff Roman Gushchin 2021-06-02 1850 if (list_empty(&pcpu_chunk_lists[pcpu_free_slot])) {
faf65dde844aff Roman Gushchin 2021-06-02 1851 chunk = pcpu_create_chunk(pcpu_gfp);
f2badb0c950ed3 Tejun Heo 2009-09-29 1852 if (!chunk) {
f2badb0c950ed3 Tejun Heo 2009-09-29 1853 err = "failed to allocate new chunk";
b38d08f3181c50 Tejun Heo 2014-09-02 1854 goto fail;
f2badb0c950ed3 Tejun Heo 2009-09-29 1855 }
ccea34b5d0fbab Tejun Heo 2009-03-07 1856
403a91b1659cb1 Jiri Kosina 2009-10-29 1857 spin_lock_irqsave(&pcpu_lock, flags);
fbf59bc9d74d1f Tejun Heo 2009-02-20 1858 pcpu_chunk_relocate(chunk, -1);
b38d08f3181c50 Tejun Heo 2014-09-02 1859 } else {
b38d08f3181c50 Tejun Heo 2014-09-02 1860 spin_lock_irqsave(&pcpu_lock, flags);
b38d08f3181c50 Tejun Heo 2014-09-02 1861 }
b38d08f3181c50 Tejun Heo 2014-09-02 1862
ccea34b5d0fbab Tejun Heo 2009-03-07 1863 goto restart;
fbf59bc9d74d1f Tejun Heo 2009-02-20 1864
fbf59bc9d74d1f Tejun Heo 2009-02-20 1865 area_found:
30a5b5367ef9d5 Dennis Zhou 2017-06-19 1866 pcpu_stats_area_alloc(chunk, size);
403a91b1659cb1 Jiri Kosina 2009-10-29 1867 spin_unlock_irqrestore(&pcpu_lock, flags);
ccea34b5d0fbab Tejun Heo 2009-03-07 1868
dca496451bddea Tejun Heo 2014-09-02 1869 /* populate if not all pages are already there */
5835d96e9ce4ef Tejun Heo 2014-09-02 1870 if (!is_atomic) {
ec288a2cf7ca40 Yury Norov 2021-08-14 1871 unsigned int page_end, rs, re;
e04d320838f573 Tejun Heo 2014-09-02 1872
ec288a2cf7ca40 Yury Norov 2021-08-14 1873 rs = PFN_DOWN(off);
dca496451bddea Tejun Heo 2014-09-02 1874 page_end = PFN_UP(off + size);
dca496451bddea Tejun Heo 2014-09-02 1875
ec288a2cf7ca40 Yury Norov 2021-08-14 1876 for_each_clear_bitrange_from(rs, re, chunk->populated, page_end) {
dca496451bddea Tejun Heo 2014-09-02 1877 WARN_ON(chunk->immutable);
dca496451bddea Tejun Heo 2014-09-02 1878
554fef1c39ee14 Dennis Zhou 2018-02-16 1879 ret = pcpu_populate_chunk(chunk, rs, re, pcpu_gfp);
b38d08f3181c50 Tejun Heo 2014-09-02 1880
403a91b1659cb1 Jiri Kosina 2009-10-29 1881 spin_lock_irqsave(&pcpu_lock, flags);
b38d08f3181c50 Tejun Heo 2014-09-02 1882 if (ret) {
40064aeca35c5c Dennis Zhou (Facebook 2017-07-12 1883) pcpu_free_area(chunk, off);
f2badb0c950ed3 Tejun Heo 2009-09-29 1884 err = "failed to populate";
ccea34b5d0fbab Tejun Heo 2009-03-07 1885 goto fail_unlock;
fbf59bc9d74d1f Tejun Heo 2009-02-20 1886 }
b239f7daf5530f Dennis Zhou 2019-02-13 1887 pcpu_chunk_populated(chunk, rs, re);
b38d08f3181c50 Tejun Heo 2014-09-02 1888 spin_unlock_irqrestore(&pcpu_lock, flags);
dca496451bddea Tejun Heo 2014-09-02 1889 }
dca496451bddea Tejun Heo 2014-09-02 1890
ccea34b5d0fbab Tejun Heo 2009-03-07 1891 mutex_unlock(&pcpu_alloc_mutex);
e04d320838f573 Tejun Heo 2014-09-02 1892 }
ccea34b5d0fbab Tejun Heo 2009-03-07 1893
faf65dde844aff Roman Gushchin 2021-06-02 1894 if (pcpu_nr_empty_pop_pages < PCPU_EMPTY_POP_PAGES_LOW)
1a4d76076cda69 Tejun Heo 2014-09-02 1895 pcpu_schedule_balance_work();
1a4d76076cda69 Tejun Heo 2014-09-02 1896
dca496451bddea Tejun Heo 2014-09-02 1897 /* clear the areas and return address relative to base address */
dca496451bddea Tejun Heo 2014-09-02 1898 for_each_possible_cpu(cpu)
dca496451bddea Tejun Heo 2014-09-02 1899 memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
dca496451bddea Tejun Heo 2014-09-02 1900
f528f0b8e53d73 Catalin Marinas 2011-09-26 1901 ptr = __addr_to_pcpu_ptr(chunk->base_addr + off);
8a8c35fadfaf55 Larry Finger 2015-06-24 1902 kmemleak_alloc_percpu(ptr, size, gfp);
df95e795a72289 Dennis Zhou 2017-06-19 1903
f67bed134a0536 Vasily Averin 2022-05-12 1904 trace_percpu_alloc_percpu(_RET_IP_, reserved, is_atomic, size, align,
f67bed134a0536 Vasily Averin 2022-05-12 1905 chunk->base_addr, off, ptr,
f67bed134a0536 Vasily Averin 2022-05-12 1906 pcpu_obj_full_size(size), gfp);
df95e795a72289 Dennis Zhou 2017-06-19 1907
3c7be18ac9a06b Roman Gushchin 2020-08-11 1908 pcpu_memcg_post_alloc_hook(objcg, chunk, off, size);
3c7be18ac9a06b Roman Gushchin 2020-08-11 1909
24e44cc22aa311 Suren Baghdasaryan 2024-03-21 1910 pcpu_alloc_tag_alloc_hook(chunk, off, size);
24e44cc22aa311 Suren Baghdasaryan 2024-03-21 1911
f528f0b8e53d73 Catalin Marinas 2011-09-26 1912 return ptr;
ccea34b5d0fbab Tejun Heo 2009-03-07 1913
ccea34b5d0fbab Tejun Heo 2009-03-07 1914 fail_unlock:
403a91b1659cb1 Jiri Kosina 2009-10-29 1915 spin_unlock_irqrestore(&pcpu_lock, flags);
b38d08f3181c50 Tejun Heo 2014-09-02 1916 fail:
df95e795a72289 Dennis Zhou 2017-06-19 1917 trace_percpu_alloc_percpu_fail(reserved, is_atomic, size, align);
df95e795a72289 Dennis Zhou 2017-06-19 1918
f7d77dfc91f747 Baoquan He 2023-07-28 1919 if (do_warn && warn_limit) {
870d4b12ad15d2 Joe Perches 2016-03-17 1920 pr_warn("allocation failed, size=%zu align=%zu atomic=%d, %s\n",
5835d96e9ce4ef Tejun Heo 2014-09-02 1921 size, align, is_atomic, err);
f7d77dfc91f747 Baoquan He 2023-07-28 1922 if (!is_atomic)
f2badb0c950ed3 Tejun Heo 2009-09-29 1923 dump_stack();
f2badb0c950ed3 Tejun Heo 2009-09-29 1924 if (!--warn_limit)
870d4b12ad15d2 Joe Perches 2016-03-17 1925 pr_info("limit reached, disable warning\n");
f2badb0c950ed3 Tejun Heo 2009-09-29 1926 }
f7d77dfc91f747 Baoquan He 2023-07-28 1927
1a4d76076cda69 Tejun Heo 2014-09-02 1928 if (is_atomic) {
f0953a1bbaca71 Ingo Molnar 2021-05-06 1929 /* see the flag handling in pcpu_balance_workfn() */
1a4d76076cda69 Tejun Heo 2014-09-02 1930 pcpu_atomic_alloc_failed = true;
1a4d76076cda69 Tejun Heo 2014-09-02 1931 pcpu_schedule_balance_work();
6710e594f71cca Tejun Heo 2016-05-25 1932 } else {
6710e594f71cca Tejun Heo 2016-05-25 1933 mutex_unlock(&pcpu_alloc_mutex);
1a4d76076cda69 Tejun Heo 2014-09-02 1934 }
3c7be18ac9a06b Roman Gushchin 2020-08-11 1935
3c7be18ac9a06b Roman Gushchin 2020-08-11 1936 pcpu_memcg_post_alloc_hook(objcg, NULL, 0, size);
3c7be18ac9a06b Roman Gushchin 2020-08-11 1937
ccea34b5d0fbab Tejun Heo 2009-03-07 1938 return NULL;
fbf59bc9d74d1f Tejun Heo 2009-02-20 1939 }
24e44cc22aa311 Suren Baghdasaryan 2024-03-21 1940 EXPORT_SYMBOL_GPL(pcpu_alloc_noprof);
edcb463997ed7b Tejun Heo 2009-03-06 1941
--
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