linux-kernel - Re: [PATCH 1/1] Fix a wrong value passed to __find_vmap

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Date: Tue, 16 Jan 2024 22:13:17 +0000
From: Lorenzo Stoakes <lstoakes@...il.com>
To: Uladzislau Rezki <urezki@...il.com>
Cc: Nathan Chancellor <nathan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Matthew Wilcox <willy@...radead.org>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Dave Chinner <david@...morbit.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 1/1] Fix a wrong value passed to __find_vmap_area()

On Thu, Jan 11, 2024 at 05:03:41PM +0100, Uladzislau Rezki wrote:
> On Thu, Jan 11, 2024 at 08:55:11AM -0700, Nathan Chancellor wrote:
> > On Thu, Jan 11, 2024 at 01:11:04PM +0100, Uladzislau Rezki (Sony) wrote:
> > > There was a type in the vmalloc_dump_obj() function. Instead
> > > of passing a real address which is "objp" an "addr" was used
> > > what is wrong and not initialized.
> > >
> > > Reported-by: kernel test robot <lkp@...el.com>
> > > Fixes: e88b85b81d5 ("mm: vmalloc: offload free_vmap_area_lock lock")
> >
> > I am not sure that e88b85b81d5 introduced this. Based on the diff, I
> > think it was actually commit 86817057732a ("mm: vmalloc: remove global
> > vmap_area_root rb-tree"). Does not really matter for the patch text but
> > I think it does matter for what change this gets squashed into.
> >
> Right you are! Below is updated version:
>
> <snip>
> From 98f1fd2d3913f3b7bcbe49785a78f67999151f1c Mon Sep 17 00:00:00 2001
> From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
> Date: Thu, 11 Jan 2024 13:04:07 +0100
> Subject: [PATCH 1/2] mm: vmalloc: Fix a wrong value passed to
>  __find_vmap_area()
>
> There was a type in the vmalloc_dump_obj() function. Instead
> of passing a real address which is "objp" an "addr" was used
> what is wrong and not initialized.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: 86817057732a ("mm: vmalloc: remove global vmap_area_root rb-tree")

I know the commits are likely to get squashed/messed with (this is now
d1d9bdd672c4 in my mm-unstable tree), will this get corrected in the commit
message also? Slightly tricky one.

Perhaps a note for Andrew unless his scripts do this already - please
update this to wherever "mm: vmalloc: remove global vmap_area_root rb-tree"
lands?

> Closes: https://lore.kernel.org/oe-kbuild-all/202401111810.TKPIXLCs-lkp@intel.com/
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  mm/vmalloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index e30dabf68263..43a6608e1397 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -4688,7 +4688,7 @@ bool vmalloc_dump_obj(void *object)
>  	vn = addr_to_node((unsigned long)objp);
>
>  	if (spin_trylock(&vn->busy.lock)) {
> -		va = __find_vmap_area(addr, &vn->busy.root);
> +		va = __find_vmap_area((unsigned long)objp, &vn->busy.root);
>
>  		if (va && va->vm) {
>  			addr = (unsigned long)va->vm->addr;
> --
> 2.39.2
> <snip>
>
> --
> Uladzislau Rezki

Otherwise looks good to me. I have some style comments but perhaps better
for me to address on the actual patch series! Feel free to add:

Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>