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Message-Id: <20230829081142.3619-2-urezki@gmail.com>
Date: Tue, 29 Aug 2023 10:11:34 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>,
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>,
Uladzislau Rezki <urezki@...il.com>,
Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
Christoph Hellwig <hch@....de>
Subject: [PATCH v2 1/9] mm: vmalloc: Add va_alloc() helper
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 <hch@....de>
Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
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
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