Subject: Re: linux-next: manual merge of the bpf-next tree with the mm-stable tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 14 Mar 2024 09:30:12 +1100

Hi all,

On Wed, 13 Mar 2024 10:51:17 +1100 Stephen Rothwell <[email-masked]> wrote:
>
> On Thu, 7 Mar 2024 12:36:19 +1100 Stephen Rothwell <[email-masked]> wrote:
> > 
> > Today's linux-next merge of the bpf-next tree got a conflict in:
> > 
> >   mm/vmalloc.c
> > 
> > between commit:
> > 
> >   8e1d743f2c26 ("mm: vmalloc: support multiple nodes in vmallocinfo")
> > 
> > from the mm-stable tree and commit:
> > 
> >   e6f798225a31 ("mm: Introduce VM_SPARSE kind and vm_area_[un]map_pages().")
> > 
> > from the bpf-next tree.
> > 
> > I fixed it up (I think - 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.
> > 
> > 
> > diff --cc mm/vmalloc.c
> > index 25a8df497255,e5b8c70950bc..000000000000
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@@ -4755,81 -4423,70 +4820,84 @@@ static void show_numa_info(struct seq_f
> >   
> >   static void show_purge_info(struct seq_file *m)
> >   {
> >  +	struct vmap_node *vn;
> >   	struct vmap_area *va;
> >  +	int i;
> >   
> >  -	spin_lock(&purge_vmap_area_lock);
> >  -	list_for_each_entry(va, &purge_vmap_area_list, list) {
> >  -		seq_printf(m, "0x%pK-0x%pK %7ld unpurged vm_area\n",
> >  -			(void *)va->va_start, (void *)va->va_end,
> >  -			va->va_end - va->va_start);
> >  -	}
> >  -	spin_unlock(&purge_vmap_area_lock);
> >  -}
> >  +	for (i = 0; i < nr_vmap_nodes; i++) {
> >  +		vn = &vmap_nodes[i];
> >   
> >  -static int s_show(struct seq_file *m, void *p)
> >  -{
> >  -	struct vmap_area *va;
> >  -	struct vm_struct *v;
> >  -
> >  -	va = list_entry(p, struct vmap_area, list);
> >  -
> >  -	if (!va->vm) {
> >  -		if (va->flags & VMAP_RAM)
> >  -			seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n",
> >  +		spin_lock(&vn->lazy.lock);
> >  +		list_for_each_entry(va, &vn->lazy.head, list) {
> >  +			seq_printf(m, "0x%pK-0x%pK %7ld unpurged vm_area\n",
> >   				(void *)va->va_start, (void *)va->va_end,
> >   				va->va_end - va->va_start);
> >  -
> >  -		goto final;
> >  +		}
> >  +		spin_unlock(&vn->lazy.lock);
> >   	}
> >  +}
> >   
> >  -	v = va->vm;
> >  +static int vmalloc_info_show(struct seq_file *m, void *p)
> >  +{
> >  +	struct vmap_node *vn;
> >  +	struct vmap_area *va;
> >  +	struct vm_struct *v;
> >  +	int i;
> >   
> >  -	seq_printf(m, "0x%pK-0x%pK %7ld",
> >  -		v->addr, v->addr + v->size, v->size);
> >  +	for (i = 0; i < nr_vmap_nodes; i++) {
> >  +		vn = &vmap_nodes[i];
> >   
> >  -	if (v->caller)
> >  -		seq_printf(m, " %pS", v->caller);
> >  +		spin_lock(&vn->busy.lock);
> >  +		list_for_each_entry(va, &vn->busy.head, list) {
> >  +			if (!va->vm) {
> >  +				if (va->flags & VMAP_RAM)
> >  +					seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n",
> >  +						(void *)va->va_start, (void *)va->va_end,
> >  +						va->va_end - va->va_start);
> >   
> >  -	if (v->nr_pages)
> >  -		seq_printf(m, " pages=%d", v->nr_pages);
> >  +				continue;
> >  +			}
> >   
> >  -	if (v->phys_addr)
> >  -		seq_printf(m, " phys=%pa", &v->phys_addr);
> >  +			v = va->vm;
> >   
> >  -	if (v->flags & VM_IOREMAP)
> >  -		seq_puts(m, " ioremap");
> >  +			seq_printf(m, "0x%pK-0x%pK %7ld",
> >  +				v->addr, v->addr + v->size, v->size);
> >   
> >  -	if (v->flags & VM_SPARSE)
> >  -		seq_puts(m, " sparse");
> >  +			if (v->caller)
> >  +				seq_printf(m, " %pS", v->caller);
> >   
> >  -	if (v->flags & VM_ALLOC)
> >  -		seq_puts(m, " vmalloc");
> >  +			if (v->nr_pages)
> >  +				seq_printf(m, " pages=%d", v->nr_pages);
> >   
> >  -	if (v->flags & VM_MAP)
> >  -		seq_puts(m, " vmap");
> >  +			if (v->phys_addr)
> >  +				seq_printf(m, " phys=%pa", &v->phys_addr);
> >   
> >  -	if (v->flags & VM_USERMAP)
> >  -		seq_puts(m, " user");
> >  +			if (v->flags & VM_IOREMAP)
> >  +				seq_puts(m, " ioremap");
> >   
> >  -	if (v->flags & VM_DMA_COHERENT)
> >  -		seq_puts(m, " dma-coherent");
> > ++			if (v->flags & VM_SPARSE)
> > ++				seq_puts(m, " sparse");
> > + 
> >  -	if (is_vmalloc_addr(v->pages))
> >  -		seq_puts(m, " vpages");
> >  +			if (v->flags & VM_ALLOC)
> >  +				seq_puts(m, " vmalloc");
> >   
> >  -	show_numa_info(m, v);
> >  -	seq_putc(m, '\n');
> >  +			if (v->flags & VM_MAP)
> >  +				seq_puts(m, " vmap");
> >  +
> >  +			if (v->flags & VM_USERMAP)
> >  +				seq_puts(m, " user");
> >  +
> >  +			if (v->flags & VM_DMA_COHERENT)
> >  +				seq_puts(m, " dma-coherent");
> >  +
> >  +			if (is_vmalloc_addr(v->pages))
> >  +				seq_puts(m, " vpages");
> >  +
> >  +			show_numa_info(m, v);
> >  +			seq_putc(m, '\n');
> >  +		}
> >  +		spin_unlock(&vn->busy.lock);
> >  +	}
> >   
> >   	/*
> >   	 * As a final step, dump "unpurged" areas.  
> 
> This is now a conflict between the net-next tree and the mm-stable tree.

 ... and now a conflict between te mm-stable tree and Linus' tree.
-- 
Cheers,
Stephen Rothwell