[baohua:dev/kairui_scanbalance 9/9] mm/vmscan.c:1957:46: error: dereferencing pointer to incomplete type 'struct lru_gen_folio'
From: kernel test robot <hidden>
Date: 2026-09-10 21:19:20
Also in:
oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/baohua/linux.git dev/kairui_scanbalance head: c96aacd4045a7a4c8d292e6c9ba6d169cdc0b570 commit: c96aacd4045a7a4c8d292e6c9ba6d169cdc0b570 [9/9] mm/mglru: avoid placing rejected folios below populated gen config: powerpc-randconfig-r123-20260910 (https://download.01.org/0day-ci/archive/20260911/202609110429.UIZ3Tr8e-lkp@intel.com/config) compiler: powerpc-linux-gcc (GCC) 8.5.0 sparse: v0.6.5-rc1 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260911/202609110429.UIZ3Tr8e-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 [off-list ref] | Closes: https://lore.kernel.org/oe-kbuild-all/202609110429.UIZ3Tr8e-lkp@intel.com/ (local) All errors (new ones prefixed by >>): ^~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' compiletime_assert_rwonce_type(x); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/vmscan.c:1955:26: note: in expansion of macro 'READ_ONCE' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~~~~~~~~ mm/vmscan.c:1955:44: error: 'struct lruvec' has no member named 'lrugen' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~ include/linux/compiler.h:68:3: note: in definition of macro '__trace_if_value' (cond) ? \ ^~~~ include/linux/compiler.h:55:28: note: in expansion of macro '__trace_if_var' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~ include/linux/compiler_types.h:682:3: note: in expansion of macro 'if' if (!(condition)) \ ^~ include/linux/compiler_types.h:690:2: note: in expansion of macro '__compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~~~~~~~~~~~~ include/linux/compiler_types.h:702:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' compiletime_assert_rwonce_type(x); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/vmscan.c:1955:26: note: in expansion of macro 'READ_ONCE' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~~~~~~~~ mm/vmscan.c:1955:44: error: 'struct lruvec' has no member named 'lrugen' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~ include/linux/compiler.h:68:3: note: in definition of macro '__trace_if_value' (cond) ? \ ^~~~ include/linux/compiler.h:55:28: note: in expansion of macro '__trace_if_var' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~ include/linux/compiler_types.h:682:3: note: in expansion of macro 'if' if (!(condition)) \ ^~ include/linux/compiler_types.h:690:2: note: in expansion of macro '__compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~~~~~~~~~~~~ include/linux/compiler_types.h:702:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^~~~~~~~~~~~~~~~~~ include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' compiletime_assert_rwonce_type(x); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/vmscan.c:1955:26: note: in expansion of macro 'READ_ONCE' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~~~~~~~~ In file included from <command-line>: mm/vmscan.c:1955:44: error: 'struct lruvec' has no member named 'lrugen' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~ include/linux/compiler_types.h:626:13: note: in definition of macro '__unqual_scalar_typeof' _Generic((x), \ ^ include/asm-generic/rwonce.h:50:2: note: in expansion of macro '__READ_ONCE' __READ_ONCE(x); \ ^~~~~~~~~~~ mm/vmscan.c:1955:26: note: in expansion of macro 'READ_ONCE' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~~~~~~~~ In file included from ./arch/powerpc/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:369, from include/asm-generic/bug.h:5, from arch/powerpc/include/asm/bug.h:116, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:7, from mm/vmscan.c:15: mm/vmscan.c:1955:44: error: 'struct lruvec' has no member named 'lrugen' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~ include/asm-generic/rwonce.h:44:72: note: in definition of macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ mm/vmscan.c:1955:26: note: in expansion of macro 'READ_ONCE' unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq); ^~~~~~~~~ In file included from include/asm-generic/bug.h:5, from arch/powerpc/include/asm/bug.h:116, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:7, from mm/vmscan.c:15:
quoted
mm/vmscan.c:1957:46: error: dereferencing pointer to incomplete type 'struct lru_gen_folio'
if (folio_test_unevictable(folio) || !lrugen->enabled)
^~
include/linux/compiler.h:57:52: note: in definition of macro '__trace_if_var'
#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
^~~~
mm/vmscan.c:1957:2: note: in expansion of macro 'if'
if (folio_test_unevictable(folio) || !lrugen->enabled)
^~
mm/vmscan.c:1960:8: error: implicit declaration of function 'lru_gen_folio_seq'; did you mean 'lru_to_folio'? [-Werror=implicit-function-declaration]
seq = lru_gen_folio_seq(lruvec, folio, false);
^~~~~~~~~~~~~~~~~
lru_to_folio
mm/vmscan.c:1962:8: error: implicit declaration of function 'lru_gen_from_seq'; did you mean 'lru_gen_set_refs'? [-Werror=implicit-function-declaration]
gen = lru_gen_from_seq(seq);
^~~~~~~~~~~~~~~~
lru_gen_set_refs
mm/vmscan.c:1967:2: error: implicit declaration of function 'lru_gen_update_size'; did you mean 'huge_page_size'? [-Werror=implicit-function-declaration]
lru_gen_update_size(lruvec, folio, -1, gen);
^~~~~~~~~~~~~~~~~~~
huge_page_size
mm/vmscan.c:1953:6: warning: variable 'zone' set but not used [-Wunused-but-set-variable]
int zone = folio_zonenum(folio);
^~~~
mm/vmscan.c:1952:6: warning: variable 'type' set but not used [-Wunused-but-set-variable]
int type = folio_is_file_lru(folio);
^~~~
cc1: some warnings being treated as errors
vim +1957 mm/vmscan.c
1938
1939 /*
1940 * Even though we have called folio_set_active() for rejected folios
1941 * in evict_folios(), they may still be demoted or placed in the last
1942 * populated generation since we can now scan all generations.
1943 * Make sure these folios are neither demoted nor placed in the last
1944 * populated generation, unless it is also the youngest generation
1945 */
1946 static inline bool lru_gen_add_rejected_folio(struct lruvec *lruvec, struct folio *folio,
1947 unsigned long scanned_seq)
1948 {
1949 unsigned long seq;
1950 unsigned long flags;
1951 int gen;
1952 int type = folio_is_file_lru(folio);
1953 int zone = folio_zonenum(folio);
1954 struct lru_gen_folio *lrugen = &lruvec->lrugen;1955 unsigned long max_seq = READ_ONCE((lruvec)->lrugen.max_seq);
1956
1957 if (folio_test_unevictable(folio) || !lrugen->enabled)
1958 return false; 1959 1960 seq = lru_gen_folio_seq(lruvec, folio, false); 1961 seq = max(seq, min(scanned_seq + 1, max_seq)); 1962 gen = lru_gen_from_seq(seq); 1963 flags = (gen + 1UL) << LRU_GEN_PGOFF; 1964 /* see the comment on MIN_NR_GENS about PG_active */ 1965 set_mask_bits(folio_flags(folio, 0), LRU_GEN_MASK | BIT(PG_active), flags); 1966 1967 lru_gen_update_size(lruvec, folio, -1, gen); 1968 list_add(&folio->lru, &lrugen->folios[gen][type][zone]); 1969 1970 return true; 1971 } 1972 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki