From: Andre Przywara <andre.przywara@linaro.org>
Date: Wed, 21 Mar 2018 13:38:21 +0000 (+0000)
Subject: ARM: GIC: add GIC_INVALID to enum gic_version
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~319
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=db8b980c4d7edd5a498659bb87b9965a60d79867;p=xen.git

ARM: GIC: add GIC_INVALID to enum gic_version

The enum gic_version at the moment just contains GIC_V2 and GIC_V3,
where GIC_V2 happens to map to 0. So without having initialised a
variable of that type, we will read back GIC_V2 (when allocated with zeroing
the memory).
To prevent ambiguities and to give an explicitly uninitialised state, add
a new first member: GIC_INVALID. Also make it obvious that this has a
"0" encoding.

Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Acked-by: Julien Grall <julien.grall@arm.com>
---

diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 565b0875ca..3079387e06 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -227,6 +227,7 @@ struct gic_lr {
 };
 
 enum gic_version {
+    GIC_INVALID = 0,    /* the default until explicitly set up */
     GIC_V2,
     GIC_V3,
 };