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

2 files changed, 87 insertions, 2 deletions

diff --git a/system/easy-kernel-power8/APKBUILD b/system/easy-kernel-power8/APKBUILD
index 34f8faddd..f06424d1a 100644
--- a/system/easy-kernel-power8/APKBUILD
+++ b/system/easy-kernel-power8/APKBUILD
@@ -13,7 +13,6 @@ options="!check !dbg !strip !tracedeps"
 license="GPL-2.0-only"
 depends=""
 makedepends="bc gzip kmod lzop openssl-dev xz"
-install=""
 provides="easy-kernel$_kflavour=$pkgver-r$pkgrel"
 subpackages="$_pkgname-modules-$pkgver-mc$pkgrel:modules
 	$_pkgname-src-$pkgver-mc$pkgrel:src
@@ -25,6 +24,7 @@ source="https://cdn.kernel.org/pub/linux/kernel/v${_pkgmajver}.x/linux-${_pkgmin
 	ast-endianness.patch
 	config-ppc64
 	futex-cmpxchg.patch
+	ppc64-epapr-gcc8.patch
 	"
 builddir="$srcdir/linux-${_pkgminver}"
 
@@ -94,4 +94,5 @@ sha512sums="77e43a02d766c3d73b7e25c4aafb2e931d6b16e870510c22cef0cdb05c3acb7952b8
 bfe606f208894cc572fb98f323e26956c69b4f75febd4a9b500514cbb2aa70bddb2aba05b3f16a5fe52535236b215335f73974324065f80643265f17f281faa6  linux-4.14-mc13.patch.xz
 e41d9111219342ad13367902242444ecdd847a93575c3f9709d6c6a075bc650f4a15be9db1a8798435fc0a0b56d41705829bfe0d2c2d88f8d1c28931e27ef5be  ast-endianness.patch
 70c09aaa7e75ef04389d69768874bc243f351a63f481b191d5708f74f1ceccf32dbbc286415aff4eaf44040a0fd75e90487a50f0c53a32f6d1c0dc779cb56fec  config-ppc64
-64486a4f53046a69f727cecd8c39400b50c2d2b15e3b5ca8c18b8249d25990f3a872ec064800ba3d190f9d25b4518899b9ea3675920f487108102856d6beb51e  futex-cmpxchg.patch"
+64486a4f53046a69f727cecd8c39400b50c2d2b15e3b5ca8c18b8249d25990f3a872ec064800ba3d190f9d25b4518899b9ea3675920f487108102856d6beb51e  futex-cmpxchg.patch
+0df4e823e19e8fc379b5ad66192eb3e890daa3dac8d7a9ebbab4cf3c60ce9f15fcc25a54b86b341db53db3d78c928ca5f55933e12eee75680e705cca8a7bdff4  ppc64-epapr-gcc8.patch"
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
+