From fcfd708b8cf86b8c1ca6ce014d50287f61c0eb88 Mon Sep 17 00:00:00 2001
From: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>
Date: Fri, 8 Jul 2016 12:35:53 -0400
Subject: arm64: Add kernel return probes support (kretprobes)

The pre-handler of this special 'trampoline' kprobe executes the return
probe handler functions and restores original return address in ELR_EL1.
This way the saved pt_regs still hold the original register context to be
carried back to the probed kernel function.

Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>
Signed-off-by: David A. Long <dave.long@linaro.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

(limited to 'arch/arm64/Kconfig')

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1f7d644f7f36..6af0e2e5c710 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -89,6 +89,7 @@ config ARM64
 	select HAVE_RCU_TABLE_FREE
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_KPROBES
+	select HAVE_KRETPROBES if HAVE_KPROBES
 	select IOMMU_DMA if IOMMU_SUPPORT
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
-- 
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