Re: [PATCH v3 06/15] mm: introduce refcount for user PTE page table page

From: kernel test robot
Date: Wed Nov 10 2021 - 19:38:17 EST

Hi Qi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on hnaz-mm/master]
[also build test ERROR on linus/master next-20211110]
[cannot apply to tip/perf/core tip/x86/core v5.15]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Qi-Zheng/Free-user-PTE-page-table-pages/20211110-185837
base: https://github.com/hnaz/linux-mm master
config: mips-allyesconfig (attached as .config)
compiler: mips-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/e03404013f81d7b11aa6f5c3fef3816320b2baf0
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Qi-Zheng/Free-user-PTE-page-table-pages/20211110-185837
git checkout e03404013f81d7b11aa6f5c3fef3816320b2baf0
# save the attached .config to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=mips prepare

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

error: no override and no default toolchain set
init/Kconfig:70:warning: 'RUSTC_VERSION': number is invalid
In file included from include/linux/mmzone.h:21,
from include/linux/gfp.h:6,
from include/linux/radix-tree.h:12,
from include/linux/fs.h:15,
from include/linux/compat.h:17,
from arch/mips/kernel/asm-offsets.c:12:
>> include/linux/mm_types.h:154:33: error: unknown type name 'pmd_t'
154 | pmd_t *pmd; /* PTE page only */
| ^~~~~
In file included from include/asm-generic/div64.h:27,
from arch/mips/include/asm/div64.h:89,
from include/linux/math.h:5,
from include/linux/math64.h:6,
from include/linux/time.h:6,
from include/linux/compat.h:10,
from arch/mips/kernel/asm-offsets.c:12:
include/linux/mm.h: In function 'pte_alloc':
include/linux/mm.h:2318:22: error: implicit declaration of function 'is_huge_pmd'; did you mean 'zap_huge_pmd'? [-Werror=implicit-function-declaration]
2318 | if (unlikely(is_huge_pmd(*pmd)))
| ^~~~~~~~~~~
include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
78 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
arch/mips/kernel/asm-offsets.c: At top level:
arch/mips/kernel/asm-offsets.c:26:6: error: no previous prototype for 'output_ptreg_defines' [-Werror=missing-prototypes]
26 | void output_ptreg_defines(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:78:6: error: no previous prototype for 'output_task_defines' [-Werror=missing-prototypes]
78 | void output_task_defines(void)
| ^~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:92:6: error: no previous prototype for 'output_thread_info_defines' [-Werror=missing-prototypes]
92 | void output_thread_info_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:108:6: error: no previous prototype for 'output_thread_defines' [-Werror=missing-prototypes]
108 | void output_thread_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:136:6: error: no previous prototype for 'output_thread_fpu_defines' [-Werror=missing-prototypes]
136 | void output_thread_fpu_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:179:6: error: no previous prototype for 'output_mm_defines' [-Werror=missing-prototypes]
179 | void output_mm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:218:6: error: no previous prototype for 'output_sc_defines' [-Werror=missing-prototypes]
218 | void output_sc_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:253:6: error: no previous prototype for 'output_signal_defined' [-Werror=missing-prototypes]
253 | void output_signal_defined(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:320:6: error: no previous prototype for 'output_pbe_defines' [-Werror=missing-prototypes]
320 | void output_pbe_defines(void)
| ^~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:332:6: error: no previous prototype for 'output_pm_defines' [-Werror=missing-prototypes]
332 | void output_pm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:346:6: error: no previous prototype for 'output_kvm_defines' [-Werror=missing-prototypes]
346 | void output_kvm_defines(void)
| ^~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:390:6: error: no previous prototype for 'output_cps_defines' [-Werror=missing-prototypes]
390 | void output_cps_defines(void)
| ^~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [scripts/Makefile.build:122: arch/mips/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1288: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:226: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.


vim +/pmd_t +154 include/linux/mm_types.h

70
71 struct page {
72 unsigned long flags; /* Atomic flags, some possibly
73 * updated asynchronously */
74 /*
75 * Five words (20/40 bytes) are available in this union.
76 * WARNING: bit 0 of the first word is used for PageTail(). That
77 * means the other users of this union MUST NOT use the bit to
78 * avoid collision and false-positive PageTail().
79 */
80 union {
81 struct { /* Page cache and anonymous pages */
82 /**
83 * @lru: Pageout list, eg. active_list protected by
84 * lruvec->lru_lock. Sometimes used as a generic list
85 * by the page owner.
86 */
87 struct list_head lru;
88 /* See page-flags.h for PAGE_MAPPING_FLAGS */
89 struct address_space *mapping;
90 pgoff_t index; /* Our offset within mapping. */
91 /**
92 * @private: Mapping-private opaque data.
93 * Usually used for buffer_heads if PagePrivate.
94 * Used for swp_entry_t if PageSwapCache.
95 * Indicates order in the buddy system if PageBuddy.
96 */
97 unsigned long private;
98 };
99 struct { /* page_pool used by netstack */
100 /**
101 * @pp_magic: magic value to avoid recycling non
102 * page_pool allocated pages.
103 */
104 unsigned long pp_magic;
105 struct page_pool *pp;
106 unsigned long _pp_mapping_pad;
107 unsigned long dma_addr;
108 atomic_long_t pp_frag_count;
109 };
110 struct { /* slab, slob and slub */
111 union {
112 struct list_head slab_list;
113 struct { /* Partial pages */
114 struct page *next;
115 #ifdef CONFIG_64BIT
116 int pages; /* Nr of pages left */
117 #else
118 short int pages;
119 #endif
120 };
121 };
122 struct kmem_cache *slab_cache; /* not slob */
123 /* Double-word boundary */
124 void *freelist; /* first free object */
125 union {
126 void *s_mem; /* slab: first object */
127 unsigned long counters; /* SLUB */
128 struct { /* SLUB */
129 unsigned inuse:16;
130 unsigned objects:15;
131 unsigned frozen:1;
132 };
133 };
134 };
135 struct { /* Tail pages of compound page */
136 unsigned long compound_head; /* Bit zero is set */
137
138 /* First tail page only */
139 unsigned char compound_dtor;
140 unsigned char compound_order;
141 atomic_t compound_mapcount;
142 unsigned int compound_nr; /* 1 << compound_order */
143 };
144 struct { /* Second tail page of compound page */
145 unsigned long _compound_pad_1; /* compound_head */
146 atomic_t hpage_pinned_refcount;
147 /* For both global and memcg */
148 struct list_head deferred_list;
149 };
150 struct { /* Page table pages */
151 unsigned long _pt_pad_1; /* compound_head */
152 union {
153 pgtable_t pmd_huge_pte; /* protected by page->ptl */
> 154 pmd_t *pmd; /* PTE page only */
155 };
156 unsigned long _pt_pad_2; /* mapping */
157 union {
158 struct mm_struct *pt_mm; /* x86 pgds only */
159 atomic_t pt_frag_refcount; /* powerpc */
160 atomic_t pte_refcount; /* PTE page only */
161 };
162 #if ALLOC_SPLIT_PTLOCKS
163 spinlock_t *ptl;
164 #else
165 spinlock_t ptl;
166 #endif
167 };
168 struct { /* ZONE_DEVICE pages */
169 /** @pgmap: Points to the hosting device page map. */
170 struct dev_pagemap *pgmap;
171 void *zone_device_data;
172 /*
173 * ZONE_DEVICE private pages are counted as being
174 * mapped so the next 3 words hold the mapping, index,
175 * and private fields from the source anonymous or
176 * page cache page while the page is migrated to device
177 * private memory.
178 * ZONE_DEVICE MEMORY_DEVICE_FS_DAX pages also
179 * use the mapping, index, and private fields when
180 * pmem backed DAX files are mapped.
181 */
182 };
183
184 /** @rcu_head: You can use this to free a page by RCU. */
185 struct rcu_head rcu_head;
186 };
187
188 union { /* This union is 4 bytes in size. */
189 /*
190 * If the page can be mapped to userspace, encodes the number
191 * of times this page is referenced by a page table.
192 */
193 atomic_t _mapcount;
194
195 /*
196 * If the page is neither PageSlab nor mappable to userspace,
197 * the value stored here may help determine what this page
198 * is used for. See page-flags.h for a list of page types
199 * which are currently stored here.
200 */
201 unsigned int page_type;
202
203 unsigned int active; /* SLAB */
204 int units; /* SLOB */
205 };
206
207 /* Usage count. *DO NOT USE DIRECTLY*. See page_ref.h */
208 atomic_t _refcount;
209

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0-DAY CI Kernel Test Service, Intel Corporation
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