From: Arnd Bergmann <arnd@xxxxxxxx> Subject: mm/mremap: fix BUILD_BUG_ON() error in get_extent clang can't evaluate this function argument at compile time when the function is not inlined, which leads to a link time failure: ld.lld: error: undefined symbol: __compiletime_assert_414 >>> referenced by mremap.c >>> mremap.o:(get_extent) in archive mm/built-in.a Mark the function as __always_inline to avoid it. Link: https://lkml.kernel.org/r/20201230154104.522605-1-arnd@xxxxxxxxxx Fixes: 9ad9718bfa41 ("mm/mremap: calculate extent in one place") Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Tested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> Tested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> Cc: Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Dmitry Safonov <0x7f454c46@xxxxxxxxx> Cc: Brian Geffon <bgeffon@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mremap.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/mm/mremap.c~mm-mremap-fix-build_bug_on-error-in-get_extent +++ a/mm/mremap.c @@ -336,8 +336,9 @@ enum pgt_entry { * valid. Else returns a smaller extent bounded by the end of the source and * destination pgt_entry. */ -static unsigned long get_extent(enum pgt_entry entry, unsigned long old_addr, - unsigned long old_end, unsigned long new_addr) +static __always_inline unsigned long get_extent(enum pgt_entry entry, + unsigned long old_addr, unsigned long old_end, + unsigned long new_addr) { unsigned long next, extent, mask, size; _
