netdev - [PATCH v5 bpf-next 3/5] vmalloc: WARN for set_vm_flush_reset

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Message-ID: <20220624215712.3050672-4-song@kernel.org>
Date:   Fri, 24 Jun 2022 14:57:10 -0700
From:   Song Liu <song@...nel.org>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <x86@...r.kernel.org>
CC:     <dave.hansen@...ux.intel.com>, <mcgrof@...nel.org>,
        <rick.p.edgecombe@...el.com>, <kernel-team@...com>,
        <daniel@...earbox.net>, Song Liu <song@...nel.org>
Subject: [PATCH v5 bpf-next 3/5] vmalloc: WARN for set_vm_flush_reset_perms() on huge pages

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@...el.com>
Signed-off-by: Song Liu <song@...nel.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