vmalloc: introduce huge_vmalloc_supported

huge_vmalloc_supported() exposes vmap_allow_huge so that users of vmalloc APIs could know whether vmalloc will return huge pages. Suggested-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Signed-off-by: Song Liu <song@kernel.org>
intel-lab-lkp · May 19, 2022 · f1d2b40 · f1d2b40
1 parent a62834a
commit f1d2b40
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diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
@@ -242,11 +242,13 @@ static inline void set_vm_flush_reset_perms(void *addr)
 	if (vm)
 		vm->flags |= VM_FLUSH_RESET_PERMS;
 }
+bool huge_vmalloc_supported(void);
 
 #else
 static inline void set_vm_flush_reset_perms(void *addr)
 {
 }
+bool huge_vmalloc_supported(void) { return false; }
 #endif
 
 /* for /proc/kcore */

diff --git 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 huge_vmalloc_supported(void)
+{
+	return vmap_allow_huge;
+}
+
 bool is_vmalloc_addr(const void *x)
 {
 	unsigned long addr = (unsigned long)kasan_reset_tag(x);