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Howlett" , Dave Chinner , "Paul E . McKenney" , Joel Fernandes , Oleksiy Avramchenko , Christoph Hellwig Subject: Re: [PATCH v2 1/9] mm: vmalloc: Add va_alloc() helper Message-ID: References: <20230829081142.3619-1-urezki@gmail.com> <20230829081142.3619-2-urezki@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230829081142.3619-2-urezki@gmail.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Rspamd-Queue-Id: 848E9C000D X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: 7sxgck16c1dx6gudk53jonfqx6rjpz5d X-HE-Tag: 1693979478-34596 X-HE-Meta: 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 gDaKlKuT 7K8E6apdLDlPpKy9CxnxpPEChU1n5SBTDaEH92oyNasJMwgw+Pb1rue2P6IALZsNn8CfH1eB8TFpCCYJHHW3Y+iW8ShYZu4Xmw3MSZo7Lxa7Lc6OzNC0PUvmNDOP9qb/t1DRy5i4qfiGts+tFQxpBwJ6W670xG5cFSJbED9Tcd7E20WKMLjXM0p/hSBQhSDwUjvk/6capc4mETERTUhwNuLhCsccVTLKHwTwttO334aR3DKetiWB8KmDcZDxmC5X5PngF9xP3WiAMZANi1vxQJgzmSgBlFQx0217h4osgeV0aHqg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 08/29/23 at 10:11am, Uladzislau Rezki (Sony) wrote: > Currently __alloc_vmap_area() function contains an open codded > logic that finds and adjusts a VA based on allocation request. > > Introduce a va_alloc() helper that adjusts found VA only. It > will be used later at least in two places. > > There is no a functional change as a result of this patch. > > Reviewed-by: Christoph Hellwig > Reviewed-by: Lorenzo Stoakes > Signed-off-by: Uladzislau Rezki (Sony) > --- > mm/vmalloc.c | 41 ++++++++++++++++++++++++++++------------- > 1 file changed, 28 insertions(+), 13 deletions(-) > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index 93cf99aba335..00afc1ee4756 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -1481,6 +1481,32 @@ adjust_va_to_fit_type(struct rb_root *root, struct list_head *head, > return 0; > } > > +static unsigned long > +va_alloc(struct vmap_area *va, > + struct rb_root *root, struct list_head *head, > + unsigned long size, unsigned long align, > + unsigned long vstart, unsigned long vend) > +{ > + unsigned long nva_start_addr; > + int ret; > + > + if (va->va_start > vstart) > + nva_start_addr = ALIGN(va->va_start, align); > + else > + nva_start_addr = ALIGN(vstart, align); > + > + /* Check the "vend" restriction. */ > + if (nva_start_addr + size > vend) > + return vend; > + > + /* Update the free vmap_area. */ > + ret = adjust_va_to_fit_type(root, head, va, nva_start_addr, size); > + if (WARN_ON_ONCE(ret)) > + return vend; > + > + return nva_start_addr; > +} > + > /* > * Returns a start address of the newly allocated area, if success. > * Otherwise a vend is returned that indicates failure. > @@ -1493,7 +1519,6 @@ __alloc_vmap_area(struct rb_root *root, struct list_head *head, > bool adjust_search_size = true; > unsigned long nva_start_addr; > struct vmap_area *va; > - int ret; > > /* > * Do not adjust when: > @@ -1511,18 +1536,8 @@ __alloc_vmap_area(struct rb_root *root, struct list_head *head, > if (unlikely(!va)) > return vend; > > - if (va->va_start > vstart) > - nva_start_addr = ALIGN(va->va_start, align); > - else > - nva_start_addr = ALIGN(vstart, align); > - > - /* Check the "vend" restriction. */ > - if (nva_start_addr + size > vend) > - return vend; > - > - /* Update the free vmap_area. */ > - ret = adjust_va_to_fit_type(root, head, va, nva_start_addr, size); > - if (WARN_ON_ONCE(ret)) > + nva_start_addr = va_alloc(va, root, head, size, align, vstart, vend); > + if (nva_start_addr == vend) > return vend; > > #if DEBUG_AUGMENT_LOWEST_MATCH_CHECK > -- > 2.30.2 Reviewed-by: Baoquan He