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It's broken the build. I get a splurge of linker errors building the mm selftests otherwise: /usr/bin/ld: /tmp/ccA0DyGC.o: in function `__pagemap_scan_get_categories': vm_util.c:(.text+0x1e9): undefined reference to `__page_size' /usr/bin/ld: vm_util.c:(.text+0x2bd): undefined reference to `__page_size' /usr/bin/ld: /tmp/ccA0DyGC.o: in function `allocate_transhuge': vm_util.c:(.text+0xb90): undefined reference to `__page_shift' /usr/bin/ld: vm_util.c:(.text+0xbfe): undefined reference to `__page_shift' /usr/bin/ld: vm_util.c:(.text+0xc52): undefined reference to `__page_size' /usr/bin/ld: vm_util.c:(.text+0xc67): undefined reference to `__page_shift' /usr/bin/ld: vm_util.c:(.text+0xc72): undefined reference to `__page_size' /usr/bin/ld: vm_util.c:(.text+0xc87): undefined reference to `__page_shift' /usr/bin/ld: vm_util.c:(.text+0xc9c): undefined reference to `__page_size' /usr/bin/ld: vm_util.c:(.text+0xcc4): undefined reference to `__page_size' etc. The idea that nobody uses these variables is simply false, see vm_util.h in same directory: extern unsigned int __page_size; extern unsigned int __page_shift; static inline unsigned int psize(void) { if (!__page_size) __page_size = sysconf(_SC_PAGESIZE); return __page_size; } static inline unsigned int pshift(void) { if (!__page_shift) __page_shift = (ffsl(psize()) - 1); return __page_shift; } So this patch just seems to be completely broken? Thanks, Lorenzo On Tue, Nov 04, 2025 at 02:28:55PM +0800, Zhang Chujun wrote: > The global variables __page_size and __page_shift are declared in > vm_util.c, but they are never used anywhere in the codebase. This > patch removes them to clean up the source and eliminate dead code. > > Signed-off-by: Zhang Chujun > > diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c > index 3869e68bb8b5..3983c368edd2 100644 > --- a/tools/testing/selftests/mm/vm_util.c > +++ b/tools/testing/selftests/mm/vm_util.c > @@ -17,9 +17,6 @@ > #define STATUS_FILE_PATH "/proc/self/status" > #define MAX_LINE_LENGTH 500 > > -unsigned int __page_size; > -unsigned int __page_shift; > - > uint64_t pagemap_get_entry(int fd, char *start) > { > const unsigned long pfn = (unsigned long)start / getpagesize(); > -- > 2.50.1.windows.1 > > > > >