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

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Date:   Sun, 1 Sep 2019 19:36:04 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Hellström <thomas@...pmail.org>,
        Jerome Glisse <jglisse@...hat.com>,
        Steven Price <steven.price@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Hellstrom <thellstrom@...are.com>
Subject: Re: [PATCH 2/3] pagewalk: separate function pointers from iterator
 data

On Sun, Sep 01, 2019 at 11:45:30AM -0700, Guenter Roeck wrote:
> 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')

I belive the macros above are missing brackets.. Can you confirm the
below takes care of things? I'll add a patch if so

diff --git a/arch/csky/include/asm/tlb.h b/arch/csky/include/asm/tlb.h
index 8c7cc097666f04..fdff9b8d70c811 100644
--- a/arch/csky/include/asm/tlb.h
+++ b/arch/csky/include/asm/tlb.h
@@ -8,14 +8,14 @@
 
 #define tlb_start_vma(tlb, vma) \
 	do { \
-		if (!tlb->fullmm) \
-			flush_cache_range(vma, vma->vm_start, vma->vm_end); \
+		if (!(tlb)->fullmm) \
+			flush_cache_range(vma, (vma)->vm_start, (vma)->vm_end); \
 	}  while (0)
 
 #define tlb_end_vma(tlb, vma) \
 	do { \
-		if (!tlb->fullmm) \
-			flush_tlb_range(vma, vma->vm_start, vma->vm_end); \
+		if (!(tlb)->fullmm) \
+			flush_tlb_range(vma, (vma)->vm_start, (vma)->vm_end); \
 	}  while (0)
 
 #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)

Thanks,
Jason