The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From a30a29091b5a6d4c64b5fc77040720a65e2dd4e6 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann <arnd@xxxxxxxx> Date: Tue, 9 Feb 2021 13:42:10 -0800 Subject: [PATCH] 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> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> diff --git a/mm/mremap.c b/mm/mremap.c index f554320281cc..aa63bfd3cad2 100644 --- a/mm/mremap.c +++ b/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;
