linux-kernel - Re: [PATCH] arm64: Change elfcore for_each_mte

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Date:   Tue, 22 Feb 2022 14:26:03 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Catalin Marinas <catalin.marinas@....com>
CC:     Will Deacon <will@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: [PATCH] arm64: Change elfcore for_each_mte_vma() to use VMA
 iterator

* Catalin Marinas <catalin.marinas@....com> [220221 13:07]:
> On Fri, Feb 18, 2022 at 02:37:04AM +0000, Liam Howlett wrote:
> > diff --git a/arch/arm64/kernel/elfcore.c b/arch/arm64/kernel/elfcore.c
> > index 3455ee4acc04..930a0bc4cac4 100644
> > --- a/arch/arm64/kernel/elfcore.c
> > +++ b/arch/arm64/kernel/elfcore.c
> > @@ -8,9 +8,9 @@
> >  #include <asm/cpufeature.h>
> >  #include <asm/mte.h>
> >  
> > -#define for_each_mte_vma(tsk, vma)					\
> > +#define for_each_mte_vma(vmi, vma)					\
> >  	if (system_supports_mte())					\
> > -		for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)	\
> > +		for_each_vma(vmi, vma)					\
> >  			if (vma->vm_flags & VM_MTE)
> >  
> >  static unsigned long mte_vma_tag_dump_size(struct vm_area_struct *vma)
> > @@ -65,8 +65,9 @@ Elf_Half elf_core_extra_phdrs(void)
> >  {
> >  	struct vm_area_struct *vma;
> >  	int vma_count = 0;
> > +	VMA_ITERATOR(vmi, current->mm, 0);
> >  
> > -	for_each_mte_vma(current, vma)
> > +	for_each_mte_vma(vmi, vma)
> >  		vma_count++;
> 
> I'm fine with the patch but it can't be applied to arm64 for-next/mte
> branch as it won't build and the maple tree doesn't have the MTE
> patches. Do you have a stable branch with the for_each_vma() iterator?

The vma iterator uses the maple tree, so this patch would resolve the
conflict but both branches are needed.

> 
> Anyway, if you find a way to solve the problem, for this patch:
> 
> Acked-by: Catalin Marinas <catalin.marinas@....com>