linux-kernel - linux-next: manual merge of the akpm-current tree with the powerpc-fixes tree

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Date:   Tue, 23 Apr 2019 19:06:06 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Ira Weiny <ira.weiny@...el.com>
Subject: linux-next: manual merge of the akpm-current tree with the
 powerpc-fixes tree

Hi all,

Today's linux-next merge of the akpm-current tree got a conflict in:

  arch/powerpc/mm/mmu_context_iommu.c

between commits:

  eb9d7a62c386 ("powerpc/mm_iommu: Fix potential deadlock")
  7a3a4d763837 ("powerpc/mm_iommu: Allow pinning large regions")

from the powerpc-fixes tree and commit:

  02f506bad7af ("mm/gup: replace get_user_pages_longterm() with FOLL_LONGTERM")

from the akpm-current tree.

I fixed it up (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/powerpc/mm/mmu_context_iommu.c
index 8330f135294f,755fe7adc0d8..000000000000
--- a/arch/powerpc/mm/mmu_context_iommu.c
+++ b/arch/powerpc/mm/mmu_context_iommu.c
@@@ -135,27 -144,18 +131,28 @@@ static long mm_iommu_do_alloc(struct mm
  	}
  
  	down_read(&mm->mmap_sem);
 -	ret = get_user_pages(ua, entries, FOLL_WRITE | FOLL_LONGTERM,
 -			     mem->hpages, NULL);
 +	chunk = (1UL << (PAGE_SHIFT + MAX_ORDER - 1)) /
 +			sizeof(struct vm_area_struct *);
 +	chunk = min(chunk, entries);
 +	for (entry = 0; entry < entries; entry += chunk) {
 +		unsigned long n = min(entries - entry, chunk);
 +
- 		ret = get_user_pages_longterm(ua + (entry << PAGE_SHIFT), n,
- 				FOLL_WRITE, mem->hpages + entry, NULL);
++		ret = get_user_pages(ua + (entry << PAGE_SHIFT), n,
++				     FOLL_WRITE | FOLL_LONGTERM,
++				     mem->hpages + entry, NULL);
 +		if (ret == n) {
 +			pinned += n;
 +			continue;
 +		}
 +		if (ret > 0)
 +			pinned += ret;
 +		break;
 +	}
  	up_read(&mm->mmap_sem);
 -	if (ret != entries) {
 -		/* free the reference taken */
 -		for (i = 0; i < ret; i++)
 -			put_page(mem->hpages[i]);
 -
 -		vfree(mem->hpas);
 -		kfree(mem);
 -		ret = -EFAULT;
 -		goto unlock_exit;
 +	if (pinned != entries) {
 +		if (!ret)
 +			ret = -EFAULT;
 +		goto free_exit;
  	}
  
  	pageshift = PAGE_SHIFT;

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