linux-kernel - Re: mm: change huge_ptep_clear_flush() to return the original pte

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Date:   Fri, 27 May 2022 08:26:24 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, regressions@...ts.linux.dev
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Matthew Wilcox <willy@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: mm: change huge_ptep_clear_flush() to return the original pte

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@canb.auug.org.au/T/

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

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


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Linaro LKFT
https://lkft.linaro.org