diff mbox series

[bpf-next,1/2] vmalloc: expose vmap_allow_huge via get_vmap_allow_huge()

Message ID 20220210064108.1095847-2-song@kernel.org (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series flexible size for bpf_prog_pack | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 15894 this patch: 15894
netdev/cc_maintainers warning 5 maintainers not CCed: kpsingh@kernel.org john.fastabend@gmail.com kafai@fb.com songliubraving@fb.com yhs@fb.com
netdev/build_clang success Errors and warnings before: 2618 this patch: 2618
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 15608 this patch: 15608
netdev/checkpatch warning CHECK: extern prototypes should be avoided in .h files
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next success VM_Test

Commit Message

Song Liu Feb. 10, 2022, 6:41 a.m. UTC 
Users can use get_vmap_allow_huge() to predict the behavior of vmalloc (or
its variations). Specifically, if get_vmap_allow_huge() == false, vmalloc
will never return huge pages.

Signed-off-by: Song Liu <song@kernel.org>
---
 include/linux/vmalloc.h | 1 +
 mm/vmalloc.c            | 5 +++++
 2 files changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 880227b9f044..22acfcd2d0d1 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -256,6 +256,7 @@  extern long vread(char *buf, char *addr, unsigned long count);
 extern struct list_head vmap_area_list;
 extern __init void vm_area_add_early(struct vm_struct *vm);
 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
+extern bool get_vmap_allow_huge(void);
 
 #ifdef CONFIG_SMP
 # ifdef CONFIG_MMU
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 4165304d3547..895ac81b6bb4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -72,6 +72,11 @@  early_param("nohugevmalloc", set_nohugevmalloc);
 static const bool vmap_allow_huge = false;
 #endif	/* CONFIG_HAVE_ARCH_HUGE_VMALLOC */
 
+bool get_vmap_allow_huge(void)
+{
+	return vmap_allow_huge;
+}
+
 bool is_vmalloc_addr(const void *x)
 {
 	unsigned long addr = (unsigned long)x;