From: Pasha Tatashin <pasha.tatashin@soleen.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
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Subject: [RFC 09/14] mm/vmalloc: Add a get_vm_area_node() and vmap_pages_range_noflush() public functions
Date: Mon, 11 Mar 2024 16:46:33 +0000 [thread overview]
Message-ID: <20240311164638.2015063-10-pasha.tatashin@soleen.com> (raw)
In-Reply-To: <20240311164638.2015063-1-pasha.tatashin@soleen.com>
get_vm_area_node()
Unlike the other public get_vm_area_* variants, this one accepts node
from which to allocate data structure, and also the align, which allows
to create vm area with a specific alignment.
This call is going to be used by dynamic stacks in order to ensure that
the stack VM area of a specific alignment, and that even if there is
only one page mapped, no page table allocations are going to be needed
to map the other stack pages.
vmap_pages_range_noflush()
Is already a global function, but was exported through mm/internal.h,
since we will need it from kernel/fork.c in order to map the initial
stack pages, move the forward declaration of this function to the
linux/vmalloc.h header.
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
---
include/linux/vmalloc.h | 15 +++++++++++++++
mm/internal.h | 9 ---------
mm/vmalloc.c | 24 ++++++++++++++++++++++++
3 files changed, 39 insertions(+), 9 deletions(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index c720be70c8dd..e18b6ab1584b 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -210,6 +210,9 @@ extern struct vm_struct *__get_vm_area_caller(unsigned long size,
unsigned long flags,
unsigned long start, unsigned long end,
const void *caller);
+struct vm_struct *get_vm_area_node(unsigned long size, unsigned long align,
+ unsigned long flags, int node, gfp_t gfp,
+ const void *caller);
void free_vm_area(struct vm_struct *area);
extern struct vm_struct *remove_vm_area(const void *addr);
extern struct vm_struct *find_vm_area(const void *addr);
@@ -241,10 +244,22 @@ static inline void set_vm_flush_reset_perms(void *addr)
vm->flags |= VM_FLUSH_RESET_PERMS;
}
+int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages,
+ unsigned int page_shift);
+
#else
static inline void set_vm_flush_reset_perms(void *addr)
{
}
+
+static inline
+int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages,
+ unsigned int page_shift)
+{
+ return -EINVAL;
+}
#endif
/* for /proc/kcore */
diff --git a/mm/internal.h b/mm/internal.h
index f309a010d50f..ba1e2ce68157 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -969,19 +969,10 @@ size_t splice_folio_into_pipe(struct pipe_inode_info *pipe,
*/
#ifdef CONFIG_MMU
void __init vmalloc_init(void);
-int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end,
- pgprot_t prot, struct page **pages, unsigned int page_shift);
#else
static inline void vmalloc_init(void)
{
}
-
-static inline
-int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end,
- pgprot_t prot, struct page **pages, unsigned int page_shift)
-{
- return -EINVAL;
-}
#endif
int __must_check __vmap_pages_range_noflush(unsigned long addr,
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d12a17fc0c17..7dcba463ff99 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2650,6 +2650,30 @@ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
NUMA_NO_NODE, GFP_KERNEL, caller);
}
+/**
+ * get_vm_area_node - reserve a contiguous and aligned kernel virtual area
+ * @size: size of the area
+ * @align: alignment of the start address of the area
+ * @flags: %VM_IOREMAP for I/O mappings
+ * @node: NUMA node from which to allocate the area data structure
+ * @gfp: Flags to pass to the allocator
+ * @caller: Caller to be stored in the vm area data structure
+ *
+ * Search an area of @size/align in the kernel virtual mapping area,
+ * and reserved it for out purposes. Returns the area descriptor
+ * on success or %NULL on failure.
+ *
+ * Return: the area descriptor on success or %NULL on failure.
+ */
+struct vm_struct *get_vm_area_node(unsigned long size, unsigned long align,
+ unsigned long flags, int node, gfp_t gfp,
+ const void *caller)
+{
+ return __get_vm_area_node(size, align, PAGE_SHIFT, flags,
+ VMALLOC_START, VMALLOC_END,
+ node, gfp, caller);
+}
+
/**
* find_vm_area - find a continuous kernel virtual area
* @addr: base address
--
2.44.0.278.ge034bb2e1d-goog
next prev parent reply other threads:[~2024-03-11 16:46 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-11 16:46 [RFC 00/14] Dynamic Kernel Stacks Pasha Tatashin
2024-03-11 16:46 ` [RFC 01/14] task_stack.h: remove obsolete __HAVE_ARCH_KSTACK_END check Pasha Tatashin
2024-03-17 14:36 ` Christophe JAILLET
2024-03-17 15:13 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 02/14] fork: Clean-up ifdef logic around stack allocation Pasha Tatashin
2024-03-11 16:46 ` [RFC 03/14] fork: Clean-up naming of vm_strack/vm_struct variables in vmap stacks code Pasha Tatashin
2024-03-17 14:42 ` Christophe JAILLET
2024-03-19 16:32 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 04/14] fork: Remove assumption that vm_area->nr_pages equals to THREAD_SIZE Pasha Tatashin
2024-03-17 14:45 ` Christophe JAILLET
2024-03-17 15:14 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 05/14] fork: check charging success before zeroing stack Pasha Tatashin
2024-03-12 15:57 ` Kirill A. Shutemov
2024-03-12 16:52 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 06/14] fork: zero vmap stack using clear_page() instead of memset() Pasha Tatashin
2024-03-12 7:15 ` Nikolay Borisov
2024-03-12 16:53 ` Pasha Tatashin
2024-03-14 7:55 ` Christophe Leroy
2024-03-14 13:52 ` Pasha Tatashin
2024-03-17 14:48 ` Christophe JAILLET
2024-03-17 15:15 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 07/14] fork: use the first page in stack to store vm_stack in cached_stacks Pasha Tatashin
2024-03-11 16:46 ` [RFC 08/14] fork: separate vmap stack alloction and free calls Pasha Tatashin
2024-03-14 15:18 ` Jeff Xie
2024-03-14 17:14 ` Pasha Tatashin
2024-03-17 14:51 ` Christophe JAILLET
2024-03-17 15:15 ` Pasha Tatashin
2024-03-11 16:46 ` Pasha Tatashin [this message]
2024-03-11 16:46 ` [RFC 10/14] fork: Dynamic Kernel Stacks Pasha Tatashin
2024-03-11 19:32 ` Randy Dunlap
2024-03-11 19:55 ` Pasha Tatashin
2024-03-11 16:46 ` [RFC 11/14] x86: add support for " Pasha Tatashin
2024-03-11 22:17 ` Andy Lutomirski
2024-03-11 23:10 ` Pasha Tatashin
2024-03-11 23:33 ` Thomas Gleixner
2024-03-11 23:34 ` Andy Lutomirski
2024-03-12 0:08 ` Pasha Tatashin
2024-03-12 0:23 ` Pasha Tatashin
2024-03-11 23:34 ` Dave Hansen
2024-03-11 23:41 ` Andy Lutomirski
2024-03-11 23:56 ` Nadav Amit
2024-03-12 0:02 ` Andy Lutomirski
2024-03-12 7:20 ` Nadav Amit
2024-03-12 0:53 ` Dave Hansen
2024-03-12 1:25 ` H. Peter Anvin
2024-03-12 2:16 ` Andy Lutomirski
2024-03-12 2:20 ` H. Peter Anvin
2024-03-12 21:58 ` Andi Kleen
2024-03-13 10:23 ` Thomas Gleixner
2024-03-13 13:43 ` Pasha Tatashin
2024-03-13 15:28 ` Pasha Tatashin
2024-03-13 16:12 ` Thomas Gleixner
2024-03-14 14:03 ` Pasha Tatashin
2024-03-14 18:26 ` Thomas Gleixner
2024-03-11 16:46 ` [RFC 12/14] task_stack.h: Clean-up stack_not_used() implementation Pasha Tatashin
2024-03-11 16:46 ` [RFC 13/14] task_stack.h: Add stack_not_used() support for dynamic stack Pasha Tatashin
2024-03-11 16:46 ` [RFC 14/14] fork: Dynamic Kernel Stack accounting Pasha Tatashin
2024-03-11 17:09 ` [RFC 00/14] Dynamic Kernel Stacks Mateusz Guzik
2024-03-11 18:58 ` Pasha Tatashin
2024-03-11 19:21 ` Mateusz Guzik
2024-03-11 19:55 ` Pasha Tatashin
2024-03-12 17:18 ` H. Peter Anvin
2024-03-12 19:45 ` Pasha Tatashin
2024-03-12 21:36 ` H. Peter Anvin
2024-03-14 19:05 ` Kent Overstreet
2024-03-14 19:23 ` Pasha Tatashin
2024-03-14 19:28 ` Kent Overstreet
2024-03-14 19:34 ` Pasha Tatashin
2024-03-14 19:49 ` Kent Overstreet
2024-03-12 22:18 ` David Laight
2024-03-14 19:43 ` Matthew Wilcox
2024-03-14 19:53 ` Kent Overstreet
2024-03-14 19:57 ` Matthew Wilcox
2024-03-14 19:58 ` Kent Overstreet
2024-03-15 3:13 ` Pasha Tatashin
2024-03-15 3:39 ` H. Peter Anvin
2024-03-16 19:17 ` Pasha Tatashin
2024-03-17 0:41 ` Matthew Wilcox
2024-03-17 1:32 ` Kent Overstreet
2024-03-17 14:19 ` Pasha Tatashin
2024-03-17 14:43 ` Brian Gerst
2024-03-17 16:15 ` Pasha Tatashin
2024-03-17 21:30 ` Brian Gerst
2024-03-18 14:59 ` Pasha Tatashin
2024-03-18 21:02 ` Brian Gerst
2024-03-19 14:56 ` Pasha Tatashin
2024-03-17 18:57 ` David Laight
2024-03-18 15:09 ` Pasha Tatashin
2024-03-18 15:13 ` Pasha Tatashin
2024-03-18 15:19 ` Matthew Wilcox
2024-03-18 15:30 ` Pasha Tatashin
2024-03-18 15:53 ` David Laight
2024-03-18 16:57 ` Pasha Tatashin
2024-03-18 15:38 ` David Laight
2024-03-18 17:00 ` Pasha Tatashin
2024-03-18 17:37 ` Pasha Tatashin
2024-03-15 4:17 ` H. Peter Anvin
2024-03-17 0:47 ` H. Peter Anvin
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