linux-kernel - Re: [PATCH v2 3/9] mm: vmalloc: Move vmap_init_free

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Date:   Wed, 6 Sep 2023 18:29:28 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Dave Chinner <david@...morbit.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 3/9] mm: vmalloc: Move vmap_init_free_space() down in
 vmalloc.c

On Wed, Sep 06, 2023 at 01:52:08PM +0800, Baoquan He wrote:
> On 08/29/23 at 10:11am, Uladzislau Rezki (Sony) wrote:
> > A vmap_init_free_space() is a function that setups a vmap space
> > and is considered as part of initialization phase. Since a main
> > entry which is vmalloc_init(), has been moved down in vmalloc.c
> > it makes sense to follow the pattern.
> > 
> > There is no a functional change as a result of this patch.
> > 
> > Reviewed-by: Christoph Hellwig <hch@....de>
> > Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> > ---
> >  mm/vmalloc.c | 82 ++++++++++++++++++++++++++--------------------------
> >  1 file changed, 41 insertions(+), 41 deletions(-)
> > 
> > diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> > index 09e315f8ea34..b7deacca1483 100644
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -2512,47 +2512,6 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align)
> >  	kasan_populate_early_vm_area_shadow(vm->addr, vm->size);
> >  }
> >  
> > -static void vmap_init_free_space(void)
> > -{
> > -	unsigned long vmap_start = 1;
> > -	const unsigned long vmap_end = ULONG_MAX;
> > -	struct vmap_area *busy, *free;
> > -
> > -	/*
> > -	 *     B     F     B     B     B     F
> > -	 * -|-----|.....|-----|-----|-----|.....|-
> > -	 *  |           The KVA space           |
> > -	 *  |<--------------------------------->|
> > -	 */
> > -	list_for_each_entry(busy, &vmap_area_list, list) {
> > -		if (busy->va_start - vmap_start > 0) {
> > -			free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
> > -			if (!WARN_ON_ONCE(!free)) {
> > -				free->va_start = vmap_start;
> > -				free->va_end = busy->va_start;
> > -
> > -				insert_vmap_area_augment(free, NULL,
> > -					&free_vmap_area_root,
> > -						&free_vmap_area_list);
> > -			}
> > -		}
> > -
> > -		vmap_start = busy->va_end;
> > -	}
> > -
> > -	if (vmap_end - vmap_start > 0) {
> > -		free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
> > -		if (!WARN_ON_ONCE(!free)) {
> > -			free->va_start = vmap_start;
> > -			free->va_end = vmap_end;
> > -
> > -			insert_vmap_area_augment(free, NULL,
> > -				&free_vmap_area_root,
> > -					&free_vmap_area_list);
> > -		}
> > -	}
> > -}
> > -
> >  static inline void setup_vmalloc_vm_locked(struct vm_struct *vm,
> >  	struct vmap_area *va, unsigned long flags, const void *caller)
> >  {
> > @@ -4443,6 +4402,47 @@ module_init(proc_vmalloc_init);
> >  
> >  #endif
> >  
> > +static void vmap_init_free_space(void)
> > +{
> > +	unsigned long vmap_start = 1;
> > +	const unsigned long vmap_end = ULONG_MAX;
> > +	struct vmap_area *busy, *free;
> > +
> > +	/*
> > +	 *     B     F     B     B     B     F
> > +	 * -|-----|.....|-----|-----|-----|.....|-
> > +	 *  |           The KVA space           |
> > +	 *  |<--------------------------------->|
> > +	 */
> > +	list_for_each_entry(busy, &vmap_area_list, list) {
> > +		if (busy->va_start - vmap_start > 0) {
> > +			free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
> > +			if (!WARN_ON_ONCE(!free)) {
> > +				free->va_start = vmap_start;
> > +				free->va_end = busy->va_start;
> > +
> > +				insert_vmap_area_augment(free, NULL,
> > +					&free_vmap_area_root,
> > +						&free_vmap_area_list);
> > +			}
> > +		}
> > +
> > +		vmap_start = busy->va_end;
> > +	}
> > +
> > +	if (vmap_end - vmap_start > 0) {
> > +		free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
> > +		if (!WARN_ON_ONCE(!free)) {
> > +			free->va_start = vmap_start;
> > +			free->va_end = vmap_end;
> > +
> > +			insert_vmap_area_augment(free, NULL,
> > +				&free_vmap_area_root,
> > +					&free_vmap_area_list);
> > +		}
> > +	}
> > +}
> > +
> >  void __init vmalloc_init(void)
> >  {
> >  	struct vmap_area *va;
> > -- 
> > 2.30.2
> > 
> 
> Reviewed-by: Baoquan He <bhe@...hat.com>
> 
Thanks!

--
Uladzislau Rezki