linux-kernel - Re: linux-next: manual merge of the char-misc.current tree with the mm-hotfixes tree

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Date:   Fri, 19 Aug 2022 13:35:04 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Greg KH <greg@...ah.com>
CC:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: manual merge of the char-misc.current tree with the
 mm-hotfixes tree

* Greg KH <greg@...ah.com> [220819 04:55]:
> On Fri, Aug 19, 2022 at 06:40:27PM +1000, Stephen Rothwell wrote:
> > Hi Greg,
> > 
> > On Fri, 19 Aug 2022 08:36:21 +0200 Greg KH <greg@...ah.com> wrote:
> > >
> > > On Fri, Aug 19, 2022 at 08:28:18AM +1000, Stephen Rothwell wrote:
> > > > 
> > > > Today's linux-next merge of the char-misc.current tree got a conflict in:
> > > > 
> > > >   drivers/android/binder_alloc.c
> > > > 
> > > > between commit:
> > > > 
> > > >   b3bb668f3dc6 ("binder_alloc: add missing mmap_lock calls when using the VMA")
> > > > 
> > > > from the mm-hotfixes tree and commit:
> > > > 
> > > >   d6f35446d076 ("binder_alloc: Add missing mmap_lock calls when using the VMA")
> > > > 
> > > > from the char-misc.current tree.
> > > > 
> > > > I fixed it up (I used the latter as it was committed later even though
> > > > the author times were the same) 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.  
> > > 
> > > These should be identical, if not, something went wrong :(
> > 
> > Something went wrong :-)
> > 
> > $ git range-diff b3bb668f3dc6^..b3bb668f3dc6 d6f35446d076^..d6f35446d076
> > 1:  b3bb668f3dc6 ! 1:  d6f35446d076 binder_alloc: add missing mmap_lock calls when using the VMA
> >     @@ Metadata
> >      Author: Liam Howlett <liam.howlett@...cle.com>
> >      
> >       ## Commit message ##
> >     -    binder_alloc: add missing mmap_lock calls when using the VMA
> >     +    binder_alloc: Add missing mmap_lock calls when using the VMA
> >      
> >     -    Take the mmap_read_lock() when using the VMA in binder_alloc_print_pages()
> >     -    and when checking for a VMA in binder_alloc_new_buf_locked().
> >     +    Take the mmap_read_lock() when using the VMA in
> >     +    binder_alloc_print_pages() and when checking for a VMA in
> >     +    binder_alloc_new_buf_locked().
> >      
> >          It is worth noting binder_alloc_new_buf_locked() drops the VMA read lock
> >     -    after it verifies a VMA exists, but may be taken again deeper in the call
> >     -    stack, if necessary.
> >     +    after it verifies a VMA exists, but may be taken again deeper in the
> >     +    call stack, if necessary.
> >      
> >     -    Link: https://lkml.kernel.org/r/20220810160209.1630707-1-Liam.Howlett@oracle.com
> >     -    Fixes: a43cfc87caaf ("android: binder: stop saving a pointer to the VMA")
> >     -    Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> >     +    Fixes: a43cfc87caaf (android: binder: stop saving a pointer to the VMA)
> >     +    Cc: stable <stable@...nel.org>
> >          Reported-by: Ondrej Mosnacek <omosnace@...hat.com>
> >     -    Reported-by: <syzbot+a7b60a176ec13cafb793@...kaller.appspotmail.com>
> >     -    Acked-by: Carlos Llamas <cmllamas@...gle.com>
> >     +    Reported-by: syzbot+a7b60a176ec13cafb793@...kaller.appspotmail.com
> >          Tested-by: Ondrej Mosnacek <omosnace@...hat.com>
> >     -    Cc: Minchan Kim <minchan@...nel.org>
> >     -    Cc: Christian Brauner (Microsoft) <brauner@...nel.org>
> >     -    Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >     -    Cc: Hridya Valsaraju <hridya@...gle.com>
> >     -    Cc: Joel Fernandes <joel@...lfernandes.org>
> >     -    Cc: Martijn Coenen <maco@...roid.com>
> >     -    Cc: Suren Baghdasaryan <surenb@...gle.com>
> >     -    Cc: Todd Kjos <tkjos@...roid.com>
> >     -    Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
> >     -    Cc: "Arve Hjønnevåg" <arve@...roid.com>
> >     -    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> >     +    Acked-by: Carlos Llamas <cmllamas@...gle.com>
> >     +    Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> >     +    Link: https://lore.kernel.org/r/20220810160209.1630707-1-Liam.Howlett@oracle.com
> >     +    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >      
> >       ## drivers/android/binder_alloc.c ##
> >      @@ drivers/android/binder_alloc.c: static struct binder_buffer *binder_alloc_new_buf_locked(
> >     @@ drivers/android/binder_alloc.c: void binder_alloc_print_pages(struct seq_file *m
> >      -		}
> >      +
> >      +	mmap_read_lock(alloc->vma_vm_mm);
> >     -+	if (binder_alloc_get_vma(alloc) == NULL)
> >     ++	if (binder_alloc_get_vma(alloc) == NULL) {
> >     ++		mmap_read_unlock(alloc->vma_vm_mm);
> >      +		goto uninitialized;
> >     + 	}
> >      +
> >     ++	mmap_read_unlock(alloc->vma_vm_mm);
> >      +	for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
> >      +		page = &alloc->pages[i];
> >      +		if (!page->page_ptr)
> >     @@ drivers/android/binder_alloc.c: void binder_alloc_print_pages(struct seq_file *m
> >      +			active++;
> >      +		else
> >      +			lru++;
> >     - 	}
> >     ++	}
> >      +
> >      +uninitialized:
> >     -+	mmap_read_unlock(alloc->vma_vm_mm);
> >       	mutex_unlock(&alloc->mutex);
> >       	seq_printf(m, "  pages: %d:%d:%d\n", active, lru, free);
> >       	seq_printf(m, "  pages high watermark: %zu\n", alloc->pages_high);
> > 
> 
> Oh wow, ok, I'll go drop my version and assume that Andrew's is the more
> correct one and let it come through his tree.
> 

b3bb668f3dc6 is the older v1 of the patch [1]. d6f35446d076 from
mm-hotfixes is the correct v2 version [2], although I don't think that's
currently in mm-hotfixes-unstable.  It looks like version 1 is now in
mm-hotfixes-unstable as well.

1: https://lore.kernel.org/linux-mm/20220809160618.1052539-1-Liam.Howlett@oracle.com/
2: https://lore.kernel.org/linux-mm/20220810160209.1630707-1-Liam.Howlett@oracle.com/

Thanks,
Liam