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Subject[PATCH v5 bpf-next 3/5] vmalloc: WARN for set_vm_flush_reset_perms() on huge pages
Date
VM_FLUSH_RESET_PERMS is not yet ready for huge pages, add a WARN to
catch misuse soon.

Suggested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Song Liu <song@kernel.org>
---
include/linux/vmalloc.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 096d48aa3437..59d3e1f3e108 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -239,6 +239,7 @@ static inline void set_vm_flush_reset_perms(void *addr)
{
struct vm_struct *vm = find_vm_area(addr);

+ WARN_ON_ONCE(is_vm_area_hugepages(addr));
if (vm)
vm->flags |= VM_FLUSH_RESET_PERMS;
}
--
2.30.2
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