linux-kernel - [PATCH] x86: move arch_get_vdso_data under CONFIG_TIME

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Date:   Tue,  5 Oct 2021 09:48:27 -0700
From:   Andrei Vagin <avagin@...il.com>
To:     linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] x86: move arch_get_vdso_data under CONFIG_TIME_NS

This patch fixes the warning:
>> vma.c:32:19: warning: no previous prototype for 'arch_get_vdso_data'
      32 | struct vdso_data *arch_get_vdso_data(void *vvar_page)
         |                   ^~~~~~~~~~~~~~~~~~

Cc: Dmitry Safonov <0x7f454c46@...il.com>
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Andrei Vagin <avagin@...il.com>
---
 arch/x86/entry/vdso/vma.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 235a5794296a..427bc56c152b 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -31,11 +31,6 @@
 #define EMIT_VVAR(name, offset)	\
 	const size_t name ## _offset = offset;
 #include <asm/vvar.h>
-
-struct vdso_data *arch_get_vdso_data(void *vvar_page)
-{
-	return (struct vdso_data *)(vvar_page + _vdso_data_offset);
-}
 #undef EMIT_VVAR
 
 unsigned int vclocks_used __read_mostly;
@@ -98,6 +93,11 @@ static int vdso_mremap(const struct vm_special_mapping *sm,
 }
 
 #ifdef CONFIG_TIME_NS
+struct vdso_data *arch_get_vdso_data(void *vvar_page)
+{
+	return (struct vdso_data *)(vvar_page + _vdso_data_offset);
+}
+
 static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
 {
 	if (likely(vma->vm_mm == current->mm))
-- 
2.31.1