linux-kernel - Re: [PATCH 1/1] mm: vmalloc: Rename addr_to_vb

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Message-ID: <ZCawHhhLygb+qySm@pc636>
Date:   Fri, 31 Mar 2023 12:04:14 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        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>,
        Dave Chinner <david@...morbit.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH 1/1] mm: vmalloc: Rename addr_to_vb_xarray() function

On Fri, Mar 31, 2023 at 09:38:49AM +0100, Lorenzo Stoakes wrote:
> On Fri, Mar 31, 2023 at 09:37:27AM +0200, Uladzislau Rezki (Sony) wrote:
> > Short the name of the addr_to_vb_xarray() function to the
> > addr_to_vb_xa(). This aligns with other internal function
> > abbreviations.
> >
> > Suggested-by: Baoquan He <bhe@...hat.com>
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> > ---
> >  mm/vmalloc.c | 12 ++++++------
> >  1 file changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> > index 671d6d5d5b78..b8b646f8a00d 100644
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -1945,7 +1945,7 @@ static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue);
> >   * used as a hash table. When used as a hash a 'cpu' passed to
> >   * per_cpu() is not actually a CPU but rather a hash index.
> >   *
> > - * A hash function is addr_to_vb_xarray() which hashes any address
> > + * A hash function is addr_to_vb_xa() which hashes any address
> >   * to a specific index(in a hash) it belongs to. This then uses a
> >   * per_cpu() macro to access an array with generated index.
> >   *
> > @@ -1971,7 +1971,7 @@ static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue);
> >   * however xarray spinlocks protect against any contention that remains.
> >   */
> >  static struct xarray *
> > -addr_to_vb_xarray(unsigned long addr)
> > +addr_to_vb_xa(unsigned long addr)
> >  {
> >  	int index = (addr / VMAP_BLOCK_SIZE) % num_possible_cpus();
> >
> > @@ -2048,7 +2048,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
> >  	bitmap_set(vb->used_map, 0, (1UL << order));
> >  	INIT_LIST_HEAD(&vb->free_list);
> >
> > -	xa = addr_to_vb_xarray(va->va_start);
> > +	xa = addr_to_vb_xa(va->va_start);
> >  	vb_idx = addr_to_vb_idx(va->va_start);
> >  	err = xa_insert(xa, vb_idx, vb, gfp_mask);
> >  	if (err) {
> > @@ -2070,7 +2070,7 @@ static void free_vmap_block(struct vmap_block *vb)
> >  	struct vmap_block *tmp;
> >  	struct xarray *xa;
> >
> > -	xa = addr_to_vb_xarray(vb->va->va_start);
> > +	xa = addr_to_vb_xa(vb->va->va_start);
> >  	tmp = xa_erase(xa, addr_to_vb_idx(vb->va->va_start));
> >  	BUG_ON(tmp != vb);
> >
> > @@ -2193,7 +2193,7 @@ static void vb_free(unsigned long addr, unsigned long size)
> >  	order = get_order(size);
> >  	offset = (addr & (VMAP_BLOCK_SIZE - 1)) >> PAGE_SHIFT;
> >
> > -	xa = addr_to_vb_xarray(addr);
> > +	xa = addr_to_vb_xa(addr);
> >  	vb = xa_load(xa, addr_to_vb_idx(addr));
> >
> >  	spin_lock(&vb->lock);
> > @@ -3556,7 +3556,7 @@ static void vmap_ram_vread(char *buf, char *addr, int count, unsigned long flags
> >  	 * Area is split into regions and tracked with vmap_block, read out
> >  	 * each region and zero fill the hole between regions.
> >  	 */
> > -	xa = addr_to_vb_xarray((unsigned long) addr);
> > +	xa = addr_to_vb_xa((unsigned long) addr);
> >  	vb = xa_load(xa, addr_to_vb_idx((unsigned long)addr));
> >  	if (!vb)
> >  		goto finished;
> > --
> > 2.30.2
> >
> 
> I have no problem with this patch but it's a bit of a pain to apply, as
> doesn't apply to mm-unstable or -next as it doesn't take into account my
> vread_iter changes, however Andrew can probably figure it out :)
> 
> I checked it manually and it's fine, so:-
> 
> Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>
>
Thanks! I based it on next-20230317. If Andrew has some issues with it
i will resend it on a latest tip!

--
Uladzislau Rezki