[PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally

[Jia Zhang]

The vsyscall page should be visible only if
vsyscall=emulate/native when dumping /proc/kcore.

Signed-off-by: Jia Zhang <zhang.jia@xxxxxxxxxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 arch/x86/mm/init_64.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 14cd7f8..cbd6ea4 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1193,8 +1193,10 @@ void __init mem_init(void)
 	register_page_bootmem_info();
 
 	/* Register memory areas for /proc/kcore */
-	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
-		   PAGE_SIZE, KCORE_USER);
+	if (get_gate_vma(&init_mm)) {
+		kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
+			   PAGE_SIZE, KCORE_USER);
+	}
 
 	mem_init_print_info(NULL);
 }
-- 
1.8.3.1