Hi David,

I'm really sorry, I just submitted the patch for version V2 and didn't notice your reply email. Here is an explanation about the environment used for compilation:

Firstly, I opened the configuration startup option CONFIG_WERROR=y

Secondly, when I tested with versions 9.4.0 and 12.3.1 of gcc, I encountered errors:

$ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
$ make mm/vmscan.o
  CALL    scripts/checksyscalls.sh
  DESCEND bpf/resolve_btfids
  INSTALL libsubcmd_headers
  CC      mm/vmscan.o
In file included from ./include/linux/init.h:5,
                 from ./include/linux/printk.h:6,
                 from ./include/asm-generic/bug.h:22,
                 from ./arch/arm64/include/asm/bug.h:26,
                 from ./include/linux/bug.h:5,
                 from ./include/linux/mmdebug.h:5,
                 from ./include/linux/mm.h:6,
                 from mm/vmscan.c:15:
mm/vmscan.c: In function ¡®read_ctrl_pos¡¯:
./include/linux/build_bug.h:78:41: error: static assertion failed: "min(tier, 4U - 1) signedness error, fix types or consider umin() before min_t()"
   78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
      |                                         ^~~~~~~~~~~~~~
./include/linux/build_bug.h:77:34: note: in expansion of macro ¡®__static_assert¡¯
   77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
      |                                  ^~~~~~~~~~~~~~~
./include/linux/minmax.h:51:2: note: in expansion of macro ¡®static_assert¡¯
   51 |  static_assert(__types_ok(x, y),   \
      |  ^~~~~~~~~~~~~
./include/linux/minmax.h:58:3: note: in expansion of macro ¡®__cmp_once¡¯
   58 |   __cmp_once(op, x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y)))
      |   ^~~~~~~~~~
./include/linux/minmax.h:85:19: note: in expansion of macro ¡®__careful_cmp¡¯
   85 | #define min(x, y) __careful_cmp(min, x, y)
      |                   ^~~~~~~~~~~~~
mm/vmscan.c:3098:37: note: in expansion of macro ¡®min¡¯
 3098 |  for (i = tier % MAX_NR_TIERS; i <= min(tier, MAX_NR_TIERS - 1); i++) {
      |                                     ^~~
make[3]: *** [scripts/Makefile.build:243: mm/vmscan.o] Error 1
make[2]: *** [scripts/Makefile.build:480: mm] Error 2
make[1]: *** [/home/user/fffs/klinux/Makefile:1944: .] Error 2
make: *** [Makefile:236: __sub-make] Error 2

$ gcc --version
gcc (GCC) 12.3.1 (kylin 12.3.1-31.p02.ky11)
$ make mm/vmscan.o
  CALL    scripts/checksyscalls.sh
  DESCEND bpf/resolve_btfids
make[4]: ¡°install_headers¡±is already the latest.
  CC      mm/vmscan.o
In file included from ./include/linux/init.h:5,
                 from ./include/linux/printk.h:6,
                 from ./include/asm-generic/bug.h:22,
                 from ./arch/arm64/include/asm/bug.h:26,
                 from ./include/linux/bug.h:5,
                 from ./include/linux/mmdebug.h:5,
                 from ./include/linux/mm.h:6,
                 from mm/vmscan.c:15:
mm/vmscan.c: In function ¡®read_ctrl_pos¡¯:
./include/linux/build_bug.h:78:41: error£ºstatic assertion failed£º"min(tier, 4U - 1) signedness error, fix types or consider umin() before min_t()"
   78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
      |                                         ^~~~~~~~~~~~~~
./include/linux/build_bug.h:77:34: note£ºin expansion of macro ¡®__static_assert¡¯
   77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
      |                                  ^~~~~~~~~~~~~~~
./include/linux/minmax.h:51:9: note£ºin expansion of macro ¡®static_assert¡¯
   51 |         static_assert(__types_ok(x, y),                 \
      |         ^~~~~~~~~~~~~
./include/linux/minmax.h:58:17: note£ºin expansion of macro ¡®__cmp_once¡¯
   58 |                 __cmp_once(op, x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y)))
      |                 ^~~~~~~~~~
./include/linux/minmax.h:85:25: note£ºin expansion of macro ¡®__careful_cmp¡¯
   85 | #define min(x, y)       __careful_cmp(min, x, y)
      |                         ^~~~~~~~~~~~~
mm/vmscan.c:3098:44: note£ºin expansion of macro ¡®min¡¯
 3098 |         for (i = tier % MAX_NR_TIERS; i <= min(tier, MAX_NR_TIERS - 1); i++) {
      |                                            ^~~
make[3]: *** [scripts/Makefile.build:243£ºmm/vmscan.o] Error 1
make[2]: *** [scripts/Makefile.build:480£ºmm] Error 2
make[1]: *** [/root/fffs/klinux/Makefile:1944£º.] Error2
make: *** [Makefile:236£º__sub-make] Error 2

Sorry again.