We can't take traps with relocation off, so blacklist enter_rtas() and
rtas_return_loc(). However, instead of blacklisting all of enter_rtas(),
introduce a new symbol __enter_rtas from where on we can't take a trap
and blacklist that.
Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
arch/powerpc/kernel/entry_64.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d1690ccfde0a..dc93452fb1fa 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -1090,6 +1090,8 @@ _GLOBAL(enter_rtas)
rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG)
ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP|MSR_RI|MSR_LE
andc r6,r0,r9
+
+__enter_rtas:
sync /* disable interrupts so SRR0/1 */
mtmsrd r0 /* don't get trashed */
@@ -1126,6 +1128,8 @@ rtas_return_loc:
mtspr SPRN_SRR1,r4
rfid
b . /* prevent speculative execution */
+_ASM_NOKPROBE_SYMBOL(__enter_rtas)
+_ASM_NOKPROBE_SYMBOL(rtas_return_loc)
.align 3
1: .llong rtas_restore_regs
--
2.13.1
