On 5/27/2022 10:56 AM, Naresh Kamboju wrote:
Following build failures noticed on arm64 on Linux mainline tree.
Which was detected and discussed at this email thread.
https://lore.kernel.org/all/20220512193855.4f6ce32f@xxxxxxxxxxxxxxxx/T/
Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
Build errors:
arch/arm64/mm/hugetlbpage.c: In function 'huge_ptep_clear_flush':
arch/arm64/mm/hugetlbpage.c:515:16: error: implicit declaration of
function 'get_clear_flush'; did you mean 'ptep_clear_flush'?
[-Werror=implicit-function-declaration]
515 | return get_clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
| ^~~~~~~~~~~~~~~
| ptep_clear_flush
arch/arm64/mm/hugetlbpage.c:515:16: error: incompatible types when
returning type 'int' but 'pte_t' was expected
515 | return get_clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/mm/hugetlbpage.c:516:1: error: control reaches end of
non-void function [-Werror=return-type]
516 | }
| ^
cc1: some warnings being treated as errors
metadata:
git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
git_describe: v5.18-9901-g7f50d4dfe816
git_sha: 7f50d4dfe816dd916a7cbf39039674825c2b388b
git_short_log: 7f50d4dfe816 (\Merge tag 'for-linus' of
https://github.com/openrisc/linux\)
target_arch: arm64
toolchain: gcc-11
That is caused by commit:
00df1f1a133b ("mm: change huge_ptep_clear_flush() to return the original
pte")
interacting with commit:
fb396bb459c1 ("arm64/hugetlb: Drop TLB flush from get_clear_flush()")
And Catalin has fixed the conflict with below changes [1], not sure why
it is not merged.
Linus, should I send a proper patch to fix this conflict for you?
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 30f5b76aabe9..9a999550df8e 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -485,12 +485,15 @@ pte_t huge_ptep_clear_flush(struct vm_area_struct
*vma,
{
size_t pgsize;
int ncontig;
+ pte_t orig_pte;
if (!pte_cont(READ_ONCE(*ptep)))
return ptep_clear_flush(vma, addr, ptep);
ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
- return get_clear_contig(vma->vm_mm, addr, ptep, pgsize, ncontig);
+ orig_pte = get_clear_contig(vma->vm_mm, addr, ptep, pgsize, ncontig);
+ flush_tlb_range(vma, addr, addr + pgsize * ncontig);
+ return orig_pte;
}
[1] https://lore.kernel.org/all/YnzqffV7STYS24Yn@xxxxxxx/
