include/linux/vmalloc.h | 8 +++++--- mm/vmalloc.c | 16 +++++++++++++--- 2 files changed, 18 insertions(+), 6 deletions(-)
Reimplement vrealloc() to be able to set node and alignment should
a user need to do so. Rename the function to vrealloc_node() to
better match what it actually does now and introduce a macro for
vrealloc() for backward compatibility.
With that change we also provide the ability for the Rust part of
the kernel to set node and aligmnent in its allocations.
Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.se>
---
include/linux/vmalloc.h | 8 +++++---
mm/vmalloc.c | 16 +++++++++++++---
2 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index fdc9aeb74a44..7d5251287687 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -197,9 +197,11 @@ extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1
extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);
#define vcalloc(...) alloc_hooks(vcalloc_noprof(__VA_ARGS__))
-void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags)
- __realloc_size(2);
-#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
+void *__must_check vrealloc_node_noprof(const void *p, size_t size,
+ unsigned long align, gfp_t flags, int nid) __realloc_size(2);
+#define vrealloc_noprof(p, s, f) vrealloc_node_noprof(p, s, 1, f, NUMA_NO_NODE)
+#define vrealloc_node(...) alloc_hooks(vrealloc_node_noprof(__VA_ARGS__))
+#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
extern void vfree(const void *addr);
extern void vfree_atomic(const void *addr);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ab986dd09b6a..117894301db1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -4081,10 +4081,12 @@ void *vzalloc_node_noprof(unsigned long size, int node)
EXPORT_SYMBOL(vzalloc_node_noprof);
/**
- * vrealloc - reallocate virtually contiguous memory; contents remain unchanged
+ * vrealloc_node - reallocate virtually contiguous memory; contents remain unchanged
* @p: object to reallocate memory for
* @size: the size to reallocate
+ * @align: requested alignment
* @flags: the flags for the page level allocator
+ * @nid: node id
*
* If @p is %NULL, vrealloc() behaves exactly like vmalloc(). If @size is 0 and
* @p is not a %NULL pointer, the object pointed to is freed.
@@ -4103,7 +4105,7 @@ EXPORT_SYMBOL(vzalloc_node_noprof);
* Return: pointer to the allocated memory; %NULL if @size is zero or in case of
* failure
*/
-void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
+void *vrealloc_node_noprof(const void *p, size_t size, unsigned long align, gfp_t flags, int nid)
{
struct vm_struct *vm = NULL;
size_t alloced_size = 0;
@@ -4127,6 +4129,13 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
if (WARN(alloced_size < old_size,
"vrealloc() has mismatched area vs requested sizes (%p)\n", p))
return NULL;
+ if (WARN(nid != NUMA_NO_NODE && nid != page_to_nid(vmalloc_to_page(p)),
+ "vrealloc() has mismatched nids\n"))
+ return NULL;
+ if (WARN((uintptr_t)p & (align - 1),
+ "will not reallocate with a bigger alignment (0x%lx)\n",
+ align))
+ return NULL;
}
/*
@@ -4158,7 +4167,8 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
}
/* TODO: Grow the vm_area, i.e. allocate and map additional pages. */
- n = __vmalloc_noprof(size, flags);
+ n = __vmalloc_node_noprof(size, align, flags, nid, __builtin_return_address(0));
+
if (!n)
return NULL;
--
2.39.2On Tue, Jun 24, 2025 at 11:51:21AM +0200, Vitaly Wool wrote:
> Reimplement vrealloc() to be able to set node and alignment should
> a user need to do so. Rename the function to vrealloc_node() to
> better match what it actually does now and introduce a macro for
> vrealloc() for backward compatibility.
>
> With that change we also provide the ability for the Rust part of
> the kernel to set node and aligmnent in its allocations.
>
> Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.se>
> ---
> include/linux/vmalloc.h | 8 +++++---
> mm/vmalloc.c | 16 +++++++++++++---
> 2 files changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index fdc9aeb74a44..7d5251287687 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -197,9 +197,11 @@ extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1
> extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);
> #define vcalloc(...) alloc_hooks(vcalloc_noprof(__VA_ARGS__))
>
> -void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags)
> - __realloc_size(2);
> -#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
> +void *__must_check vrealloc_node_noprof(const void *p, size_t size,
> + unsigned long align, gfp_t flags, int nid) __realloc_size(2);
> +#define vrealloc_noprof(p, s, f) vrealloc_node_noprof(p, s, 1, f, NUMA_NO_NODE)
> +#define vrealloc_node(...) alloc_hooks(vrealloc_node_noprof(__VA_ARGS__))
> +#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
>
> extern void vfree(const void *addr);
> extern void vfree_atomic(const void *addr);
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index ab986dd09b6a..117894301db1 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -4081,10 +4081,12 @@ void *vzalloc_node_noprof(unsigned long size, int node)
> EXPORT_SYMBOL(vzalloc_node_noprof);
>
> /**
> - * vrealloc - reallocate virtually contiguous memory; contents remain unchanged
> + * vrealloc_node - reallocate virtually contiguous memory; contents remain unchanged
> * @p: object to reallocate memory for
> * @size: the size to reallocate
> + * @align: requested alignment
> * @flags: the flags for the page level allocator
> + * @nid: node id
> *
> * If @p is %NULL, vrealloc() behaves exactly like vmalloc(). If @size is 0 and
> * @p is not a %NULL pointer, the object pointed to is freed.
> @@ -4103,7 +4105,7 @@ EXPORT_SYMBOL(vzalloc_node_noprof);
> * Return: pointer to the allocated memory; %NULL if @size is zero or in case of
> * failure
> */
> -void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
> +void *vrealloc_node_noprof(const void *p, size_t size, unsigned long align, gfp_t flags, int nid)
> {
> struct vm_struct *vm = NULL;
> size_t alloced_size = 0;
> @@ -4127,6 +4129,13 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
> if (WARN(alloced_size < old_size,
> "vrealloc() has mismatched area vs requested sizes (%p)\n", p))
> return NULL;
> + if (WARN(nid != NUMA_NO_NODE && nid != page_to_nid(vmalloc_to_page(p)),
> + "vrealloc() has mismatched nids\n"))
> + return NULL;
> + if (WARN((uintptr_t)p & (align - 1),
> + "will not reallocate with a bigger alignment (0x%lx)\n",
> + align))
> + return NULL;
> }
>
> /*
> @@ -4158,7 +4167,8 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
> }
>
> /* TODO: Grow the vm_area, i.e. allocate and map additional pages. */
> - n = __vmalloc_noprof(size, flags);
> + n = __vmalloc_node_noprof(size, align, flags, nid, __builtin_return_address(0));
> +
> if (!n)
> return NULL;
>
> --
> 2.39.2
>
Do we have users which require alignment and nid? I see that it is part
of kvrealloc() API only.
--
Uladzislau Rezki
> On Jun 24, 2025, at 2:02 PM, Uladzislau Rezki <urezki@gmail.com> wrote:
>
> On Tue, Jun 24, 2025 at 11:51:21AM +0200, Vitaly Wool wrote:
>> Reimplement vrealloc() to be able to set node and alignment should
>> a user need to do so. Rename the function to vrealloc_node() to
>> better match what it actually does now and introduce a macro for
>> vrealloc() for backward compatibility.
>>
>> With that change we also provide the ability for the Rust part of
>> the kernel to set node and aligmnent in its allocations.
>>
>> Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.se>
>> ---
>> include/linux/vmalloc.h | 8 +++++---
>> mm/vmalloc.c | 16 +++++++++++++---
>> 2 files changed, 18 insertions(+), 6 deletions(-)
>>
>> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
>> index fdc9aeb74a44..7d5251287687 100644
>> --- a/include/linux/vmalloc.h
>> +++ b/include/linux/vmalloc.h
>> @@ -197,9 +197,11 @@ extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1
>> extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);
>> #define vcalloc(...) alloc_hooks(vcalloc_noprof(__VA_ARGS__))
>>
>> -void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags)
>> - __realloc_size(2);
>> -#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
>> +void *__must_check vrealloc_node_noprof(const void *p, size_t size,
>> + unsigned long align, gfp_t flags, int nid) __realloc_size(2);
>> +#define vrealloc_noprof(p, s, f) vrealloc_node_noprof(p, s, 1, f, NUMA_NO_NODE)
>> +#define vrealloc_node(...) alloc_hooks(vrealloc_node_noprof(__VA_ARGS__))
>> +#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
>>
>> extern void vfree(const void *addr);
>> extern void vfree_atomic(const void *addr);
>> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>> index ab986dd09b6a..117894301db1 100644
>> --- a/mm/vmalloc.c
>> +++ b/mm/vmalloc.c
>> @@ -4081,10 +4081,12 @@ void *vzalloc_node_noprof(unsigned long size, int node)
>> EXPORT_SYMBOL(vzalloc_node_noprof);
>>
>> /**
>> - * vrealloc - reallocate virtually contiguous memory; contents remain unchanged
>> + * vrealloc_node - reallocate virtually contiguous memory; contents remain unchanged
>> * @p: object to reallocate memory for
>> * @size: the size to reallocate
>> + * @align: requested alignment
>> * @flags: the flags for the page level allocator
>> + * @nid: node id
>> *
>> * If @p is %NULL, vrealloc() behaves exactly like vmalloc(). If @size is 0 and
>> * @p is not a %NULL pointer, the object pointed to is freed.
>> @@ -4103,7 +4105,7 @@ EXPORT_SYMBOL(vzalloc_node_noprof);
>> * Return: pointer to the allocated memory; %NULL if @size is zero or in case of
>> * failure
>> */
>> -void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
>> +void *vrealloc_node_noprof(const void *p, size_t size, unsigned long align, gfp_t flags, int nid)
>> {
>> struct vm_struct *vm = NULL;
>> size_t alloced_size = 0;
>> @@ -4127,6 +4129,13 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
>> if (WARN(alloced_size < old_size,
>> "vrealloc() has mismatched area vs requested sizes (%p)\n", p))
>> return NULL;
>> + if (WARN(nid != NUMA_NO_NODE && nid != page_to_nid(vmalloc_to_page(p)),
>> + "vrealloc() has mismatched nids\n"))
>> + return NULL;
>> + if (WARN((uintptr_t)p & (align - 1),
>> + "will not reallocate with a bigger alignment (0x%lx)\n",
>> + align))
>> + return NULL;
>> }
>>
>> /*
>> @@ -4158,7 +4167,8 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags)
>> }
>>
>> /* TODO: Grow the vm_area, i.e. allocate and map additional pages. */
>> - n = __vmalloc_noprof(size, flags);
>> + n = __vmalloc_node_noprof(size, align, flags, nid, __builtin_return_address(0));
>> +
>> if (!n)
>> return NULL;
>>
>> --
>> 2.39.2
>>
> Do we have users which require alignment and nid? I see that it is part
> of kvrealloc() API only.
>
There’s a patch pending inclusion of this one which will be the user of this change. I was reluctant
to combine these 2 in one series because the second one is on the Rust side, but it can be found
here: https://github.com/vwool/linux-mm/pull/new/realloc-extend.
~Vitaly
On Tue, Jun 24, 2025 at 1:15 PM Vitaly Wool <vitaly.wool@konsulko.se> wrote: > > > > > On Jun 24, 2025, at 2:02 PM, Uladzislau Rezki <urezki@gmail.com> wrote: > > Do we have users which require alignment and nid? I see that it is part > > of kvrealloc() API only. > > > > There’s a patch pending inclusion of this one which will be the user of this change. I was reluctant > to combine these 2 in one series because the second one is on the Rust side, but it can be found > here: https://github.com/vwool/linux-mm/pull/new/realloc-extend. I think it is useful to include the immediate user in the same series so we can see how it will be used. Alice
> On Jun 24, 2025, at 2:22 PM, Alice Ryhl <aliceryhl@google.com> wrote: > > On Tue, Jun 24, 2025 at 1:15 PM Vitaly Wool <vitaly.wool@konsulko.se> wrote: >> >> >> >>> On Jun 24, 2025, at 2:02 PM, Uladzislau Rezki <urezki@gmail.com> wrote: >>> Do we have users which require alignment and nid? I see that it is part >>> of kvrealloc() API only. >>> >> >> There’s a patch pending inclusion of this one which will be the user of this change. I was reluctant >> to combine these 2 in one series because the second one is on the Rust side, but it can be found >> here: https://github.com/vwool/linux-mm/pull/new/realloc-extend. > > I think it is useful to include the immediate user in the same series > so we can see how it will be used. > > Alice > Alright, stay tuned. ~Vitaly
On Tue, Jun 24, 2025 at 02:15:01PM +0200, Vitaly Wool wrote: > There’s a patch pending inclusion of this one which will be the user of this change. I was reluctant > to combine these 2 in one series because the second one is on the Rust side, but it can be found > here: https://github.com/vwool/linux-mm/pull/new/realloc-extend. I think the link is broken, I suppose you wanted to refer to the patch in [1]. [1] https://github.com/vwool/linux-mm/commit/5af47ac6f9010814263617b2136203a54ed4c25e
> On Jun 24, 2025, at 2:21 PM, Danilo Krummrich <dakr@kernel.org> wrote: > > On Tue, Jun 24, 2025 at 02:15:01PM +0200, Vitaly Wool wrote: >> There’s a patch pending inclusion of this one which will be the user of this change. I was reluctant >> to combine these 2 in one series because the second one is on the Rust side, but it can be found >> here: https://github.com/vwool/linux-mm/pull/new/realloc-extend. > > I think the link is broken, I suppose you wanted to refer to the patch in [1]. > > [1] https://github.com/vwool/linux-mm/commit/5af47ac6f9010814263617b2136203a54ed4c25e > You’re right, thanks a lot! ~Vitaly
© 2016 - 2026 Red Hat, Inc.