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

[Guenter Roeck <linux@roeck-us.net>]

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@lst.de>
> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
> Reviewed-by: Steven Price <steven.price@arm.com>
> Reviewed-by: Jason Gunthorpe <jgg@mellanox.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

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# good: [d2b219ed03d45a9799e4ba780c209edf9c510d3b] mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end
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# good: [4e10e8c36663a011f77d39c937aaa473fad90de3] mm: split out a new pagewalk.h header from mm.h
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# first bad commit: [923bfc561e7535f7dc2be136da75690582268cf2] pagewalk: separate function pointers from iterator data