arm64/vdso: don't leak kernel addresses

mainline inclusion
from mainline-5.1-rc3
commit 0f1bf7e39822
category: bugfix
bugzilla: 14486
CVE: NA

-------------------------------------------------

Since commit ad67b74d ("printk: hash addresses printed with %p"),
two obfuscated kernel pointer are printed at every boot:

    vdso: 2 pages (1 code @ (____ptrval____), 1 data @ (____ptrval____))

Remove the the print completely, as it's useless without the addresses.

Fixes: ad67b74d ("printk: hash addresses printed with %p")
Acked-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NMatteo Croce <mcroce@redhat.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NYao Hongbo <yaohongbo@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/kernel/vdso.c

@@ -146,8 +146,6 @@ static int __init vdso_init(void)
 	}
 
 	vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
-	pr_info("vdso: %ld pages (%ld code @ %p, %ld data @ %p)\n",
-		vdso_pages + 1, vdso_pages, vdso_start, 1L, vdso_data);
 
 	/* Allocate the vDSO pagelist, plus a page for the data. */
 	vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),