linux-kernel - Re: [PATCH 2/3] pagewalk: separate function pointers from iterator data

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Date:   Sun, 1 Sep 2019 11:45:30 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Hellström <thomas@...pmail.org>,
        Jerome Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Steven Price <steven.price@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Thomas Hellstrom <thellstrom@...are.com>
Subject: Re: [PATCH 2/3] pagewalk: separate function pointers from iterator
 data

On Wed, Aug 28, 2019 at 04:19:54PM +0200, Christoph Hellwig wrote:
> The mm_walk structure currently mixed data and code.  Split out the
> operations vectors into a new mm_walk_ops structure, and while we
> are changing the API also declare the mm_walk structure inside the
> walk_page_range and walk_page_vma functions.
> 
> Based on patch from Linus Torvalds.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
> Reviewed-by: Steven Price <steven.price@....com>
> Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>

When building csky:defconfig:

In file included from mm/madvise.c:30:
mm/madvise.c: In function 'madvise_free_single_vma':
arch/csky/include/asm/tlb.h:11:11: error:
	invalid type argument of '->' (have 'struct mmu_gather')

Guenter

---
# bad: [6d028043b55e54f48fbdf62ea8ce11a4ad830cac] Add linux-next specific files for 20190830
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# good: [450fd5809930dfee10dbbf351cdb2148cd022b1c] Merge remote-tracking branch 'regulator/for-next'
git bisect good 450fd5809930dfee10dbbf351cdb2148cd022b1c
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git bisect good 12b85c8517393b5466dff225a338fc7416150df0
# good: [ecda3e90e6357b15f3189ce00938ea5a20850b76] Merge remote-tracking branch 'scsi/for-next'
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# good: [f3bf5fa4097e06b9cabb193599a012680380e52e] kernel/elfcore.c: include proper prototypes
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git bisect good 47f725ee7b5f5cae1f83512961bcf8b41a7a5794
# good: [f9016e8058fdcd4aadc9932e045891a7b3bc8c8f] Merge remote-tracking branch 'nvmem/for-next'
git bisect good f9016e8058fdcd4aadc9932e045891a7b3bc8c8f
# good: [2f6e2a06b51e0dd9767bf37c3542ee3b5e4611d4] Merge remote-tracking branch 'pidfd/for-next'
git bisect good 2f6e2a06b51e0dd9767bf37c3542ee3b5e4611d4
# good: [d2b219ed03d45a9799e4ba780c209edf9c510d3b] mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end
git bisect good d2b219ed03d45a9799e4ba780c209edf9c510d3b
# good: [4e10e8c36663a011f77d39c937aaa473fad90de3] mm: split out a new pagewalk.h header from mm.h
git bisect good 4e10e8c36663a011f77d39c937aaa473fad90de3
# bad: [5b8f3df6239c3a9b625ab4bdc69c54d4768a4f06] pagewalk: use lockdep_assert_held for locking validation
git bisect bad 5b8f3df6239c3a9b625ab4bdc69c54d4768a4f06
# bad: [923bfc561e7535f7dc2be136da75690582268cf2] pagewalk: separate function pointers from iterator data
git bisect bad 923bfc561e7535f7dc2be136da75690582268cf2
# first bad commit: [923bfc561e7535f7dc2be136da75690582268cf2] pagewalk: separate function pointers from iterator data