system/easy-kernel*: Fix build for powerpc64 with GCC 8

1 files changed, 84 insertions, 0 deletions

diff --git a/system/easy-kernel-power8/ppc64-epapr-gcc8.patch b/system/easy-kernel-power8/ppc64-epapr-gcc8.patch
new file mode 100644
index 000000000..192e83845
--- /dev/null
+++ b/system/easy-kernel-power8/ppc64-epapr-gcc8.patch
@@ -0,0 +1,84 @@
+From 186b8f1587c79c2fa04bfa392fdf084443e398c1 Mon Sep 17 00:00:00 2001
+From: Seth Forshee <seth.forshee@canonical.com>
+Date: Thu, 28 Sep 2017 09:33:39 -0400
+Subject: powerpc: Always initialize input array when calling epapr_hypercall()
+
+Several callers to epapr_hypercall() pass an uninitialized stack
+allocated array for the input arguments, presumably because they
+have no input arguments. However this can produce errors like
+this one
+
+ arch/powerpc/include/asm/epapr_hcalls.h:470:42: error: 'in' may be used uninitialized in this function [-Werror=maybe-uninitialized]
+  unsigned long register r3 asm("r3") = in[0];
+                                        ~~^~~
+
+Fix callers to this function to always zero-initialize the input
+arguments array to prevent this.
+
+Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
+Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
+---
+ arch/powerpc/include/asm/epapr_hcalls.h | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/arch/powerpc/include/asm/epapr_hcalls.h b/arch/powerpc/include/asm/epapr_hcalls.h
+index 334459ad145b..90863245df53 100644
+--- a/arch/powerpc/include/asm/epapr_hcalls.h
++++ b/arch/powerpc/include/asm/epapr_hcalls.h
+@@ -508,7 +508,7 @@ static unsigned long epapr_hypercall(unsigned long *in,
+ 
+ static inline long epapr_hypercall0_1(unsigned int nr, unsigned long *r2)
+ {
+-	unsigned long in[8];
++	unsigned long in[8] = {0};
+ 	unsigned long out[8];
+ 	unsigned long r;
+ 
+@@ -520,7 +520,7 @@ static inline long epapr_hypercall0_1(unsigned int nr, unsigned long *r2)
+ 
+ static inline long epapr_hypercall0(unsigned int nr)
+ {
+-	unsigned long in[8];
++	unsigned long in[8] = {0};
+ 	unsigned long out[8];
+ 
+ 	return epapr_hypercall(in, out, nr);
+@@ -528,7 +528,7 @@ static inline long epapr_hypercall0(unsigned int nr)
+ 
+ static inline long epapr_hypercall1(unsigned int nr, unsigned long p1)
+ {
+-	unsigned long in[8];
++	unsigned long in[8] = {0};
+ 	unsigned long out[8];
+ 
+ 	in[0] = p1;
+@@ -538,7 +538,7 @@ static inline long epapr_hypercall1(unsigned int nr, unsigned long p1)
+ static inline long epapr_hypercall2(unsigned int nr, unsigned long p1,
+ 				    unsigned long p2)
+ {
+-	unsigned long in[8];
++	unsigned long in[8] = {0};
+ 	unsigned long out[8];
+ 
+ 	in[0] = p1;
+@@ -549,7 +549,7 @@ static inline long epapr_hypercall2(unsigned int nr, unsigned long p1,
+ static inline long epapr_hypercall3(unsigned int nr, unsigned long p1,
+ 				    unsigned long p2, unsigned long p3)
+ {
+-	unsigned long in[8];
++	unsigned long in[8] = {0};
+ 	unsigned long out[8];
+ 
+ 	in[0] = p1;
+@@ -562,7 +562,7 @@ static inline long epapr_hypercall4(unsigned int nr, unsigned long p1,
+ 				    unsigned long p2, unsigned long p3,
+ 				    unsigned long p4)
+ {
+-	unsigned long in[8];
++	unsigned long in[8] = {0};
+ 	unsigned long out[8];
+ 
+ 	in[0] = p1;
+-- 
+cgit 1.2-0.3.lf.el7
+