[PATCH] powerpc: Avoid link stack corruption in {add_}reloc_offset

[Christophe Leroy]

reloc_offset() / add_reloc_offset() used bl;mflr to get code
position.

Use bcl 20,31,+4 instead of bl in order to preserve link stack.

See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption
in __get_datapage()") for details.

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/kernel/misc.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index 5be96feccb55..acd557637a3c 100644
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -29,7 +29,7 @@ _GLOBAL(reloc_offset)
        li      r3, 0
 _GLOBAL(add_reloc_offset)
        mflr    r0
-       bl      1f
+       bcl     20,31,1f
 1:     mflr    r5
        PPC_LL  r4,(2f-1b)(r5)
        subf    r5,r4,r5
-- 
2.25.0