[PATCH 25/28] mm: remove vmalloc_user_node_flags
From: Christoph Hellwig <hch@lst.de>
Date: 2020-04-08 12:01:22
Also in:
bpf, linux-arch, linux-arm-kernel, linux-hyperv, linux-iommu, linux-mm, linux-s390, lkml
Subsystem:
bpf [core], bpf [general] (safe dynamic programs and tools), memory management, memory mapping, the rest, vmalloc · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Andrew Morton, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds, Uladzislau Rezki
Open code it in __bpf_map_area_alloc, which is the only caller. Also clean up __bpf_map_area_alloc to have a single vmalloc call with slightly different flags instead of the current two different calls. For this to compile for the nommu case add a __vmalloc_node_range stub to nommu.c. Signed-off-by: Christoph Hellwig <hch@lst.de> --- include/linux/vmalloc.h | 1 - kernel/bpf/syscall.c | 23 +++++++++++++---------- mm/nommu.c | 14 ++++++++------ mm/vmalloc.c | 20 -------------------- 4 files changed, 21 insertions(+), 37 deletions(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 108f49b47756..f90f2946aac2 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h@@ -106,7 +106,6 @@ extern void *vzalloc(unsigned long size); extern void *vmalloc_user(unsigned long size); extern void *vmalloc_node(unsigned long size, int node); extern void *vzalloc_node(unsigned long size, int node); -extern void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags); extern void *vmalloc_exec(unsigned long size); extern void *vmalloc_32(unsigned long size); extern void *vmalloc_32_user(unsigned long size);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 48d98ea8fad6..249d9bd43321 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c@@ -281,26 +281,29 @@ static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable) * __GFP_RETRY_MAYFAIL to avoid such situations. */ - const gfp_t flags = __GFP_NOWARN | __GFP_ZERO; + const gfp_t gfp = __GFP_NOWARN | __GFP_ZERO; + unsigned int flags = 0; + unsigned long align = 1; void *area; if (size >= SIZE_MAX) return NULL; /* kmalloc()'ed memory can't be mmap()'ed */ - if (!mmapable && size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { - area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags, + if (mmapable) { + BUG_ON(!PAGE_ALIGNED(size)); + align = SHMLBA; + flags = VM_USERMAP; + } else if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { + area = kmalloc_node(size, gfp | GFP_USER | __GFP_NORETRY, numa_node); if (area != NULL) return area; } - if (mmapable) { - BUG_ON(!PAGE_ALIGNED(size)); - return vmalloc_user_node_flags(size, numa_node, GFP_KERNEL | - __GFP_RETRY_MAYFAIL | flags); - } - return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_RETRY_MAYFAIL | flags, - numa_node, __builtin_return_address(0)); + + return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END, + gfp | GFP_KERNEL | __GFP_RETRY_MAYFAIL, PAGE_KERNEL, + flags, numa_node, __builtin_return_address(0)); } void *bpf_map_area_alloc(u64 size, int numa_node)
diff --git a/mm/nommu.c b/mm/nommu.c
index 81a86cd85893..b42cd6003d7d 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c@@ -150,6 +150,14 @@ void *__vmalloc(unsigned long size, gfp_t gfp_mask) } EXPORT_SYMBOL(__vmalloc); +void *__vmalloc_node_range(unsigned long size, unsigned long align, + unsigned long start, unsigned long end, gfp_t gfp_mask, + pgprot_t prot, unsigned long vm_flags, int node, + const void *caller) +{ + return __vmalloc(size, flags); +} + void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, int node, const void *caller) {
@@ -180,12 +188,6 @@ void *vmalloc_user(unsigned long size) } EXPORT_SYMBOL(vmalloc_user); -void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags) -{ - return __vmalloc_user_flags(size, flags | __GFP_ZERO); -} -EXPORT_SYMBOL(vmalloc_user_node_flags); - struct page *vmalloc_to_page(const void *addr) { return virt_to_page(addr);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 333fbe77255a..f6f2acdaf70c 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c@@ -2658,26 +2658,6 @@ void *vzalloc_node(unsigned long size, int node) } EXPORT_SYMBOL(vzalloc_node); -/** - * vmalloc_user_node_flags - allocate memory for userspace on a specific node - * @size: allocation size - * @node: numa node - * @flags: flags for the page level allocator - * - * The resulting memory area is zeroed so it can be mapped to userspace - * without leaking data. - * - * Return: pointer to the allocated memory or %NULL on error - */ -void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags) -{ - return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END, - flags | __GFP_ZERO, PAGE_KERNEL, - VM_USERMAP, node, - __builtin_return_address(0)); -} -EXPORT_SYMBOL(vmalloc_user_node_flags); - /** * vmalloc_exec - allocate virtually contiguous, executable memory * @size: allocation size
--
2.25.1