linux-kernel - Re: linux-next: manual merge of the csky tree with the mm tree

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Date:   Tue, 15 Aug 2023 11:11:52 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Guo Ren <guoren@...ux.alibaba.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: linux-next: manual merge of the csky tree with the mm tree

On Tue, Aug 15, 2023 at 8:46 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> Today's linux-next merge of the csky tree got a conflict in:
>
>   arch/csky/abiv2/cacheflush.c
>
> between commit:
>
>   1222e1310d64 ("csky: implement the new page table range API")
Could I take this patch into csky next tree to solve the conflict.

>
> from the mm tree and commit:
>
>   1362d15ffb59 ("csky: pgtable: Invalidate stale I-cache lines in update_mmu_cache")
>
> from the csky tree.
>
> I fixed it up (I think - see below) and can carry the fix as
> necessary. This is now fixed as far as linux-next is concerned, but any
> non trivial conflicts should be mentioned to your upstream maintainer
> when your tree is submitted for merging.  You may also want to consider
> cooperating with the maintainer of the conflicting tree to minimise any
> particularly complex conflicts.
>
> --
> Cheers,
> Stephen Rothwell
>
> diff --cc arch/csky/abiv2/cacheflush.c
> index d05a551af5d5,500eb8f69397..000000000000
> --- a/arch/csky/abiv2/cacheflush.c
> +++ b/arch/csky/abiv2/cacheflush.c
> @@@ -16,23 -15,22 +16,22 @@@ void update_mmu_cache_range(struct vm_f
>
>         flush_tlb_page(vma, address);
>
>  -      if (!pfn_valid(pte_pfn(*pte)))
>  +      if (!pfn_valid(pfn))
>                 return;
>
>  -      page = pfn_to_page(pte_pfn(*pte));
>  -      if (page == ZERO_PAGE(0))
>  +      folio = page_folio(pfn_to_page(pfn));
>  +
>  +      if (test_and_set_bit(PG_dcache_clean, &folio->flags))
>                 return;
>
>  -      if (test_and_set_bit(PG_dcache_clean, &page->flags))
>  -              return;
>  +      for (i = 0; i < folio_nr_pages(folio); i++) {
>  +              unsigned long addr = (unsigned long) kmap_local_folio(folio,
>  +                                                              i * PAGE_SIZE);
>
>  -      addr = (unsigned long) kmap_atomic(page);
>  -
>  -      icache_inv_range(address, address + PAGE_SIZE);
>  -      dcache_wb_range(addr, addr + PAGE_SIZE);
>  -
>  -      kunmap_atomic((void *) addr);
> ++              icache_inv_range(address, address + PAGE_SIZE);
>  +              dcache_wb_range(addr, addr + PAGE_SIZE);
> -               if (vma->vm_flags & VM_EXEC)
> -                       icache_inv_range(addr, addr + PAGE_SIZE);
>  +              kunmap_local((void *) addr);
>  +      }
>   }
>
>   void flush_icache_deferred(struct mm_struct *mm)



-- 
Best Regards
 Guo Ren