[Xen-changelog] [xen staging] xen/arm: gic: Remove pointless assertion against enum gic_sgi

[patchbot@xxxxxxx]

commit f44a192d22a37dcb9171b95978b43637bc09718d
Author:     Julien Grall <julien@xxxxxxx>
AuthorDate: Sat Jan 18 15:39:24 2020 +0000
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Tue Jan 21 13:17:52 2020 -0800

    xen/arm: gic: Remove pointless assertion against enum gic_sgi
    
    The Arm Compiler will complain that the assertions ASSERT(sgi < 16) are
    always true. This is because sgi is an item of the enum gic_sgi and
    should always contain less than 16 SGIs.
    
    Rather than using ASSERTs, introduce a new item in the enum that could
    be checked against a build time.
    
    Take the opportunity to remove the specific assigned values for each
    item. This is fine because enum always starts at zero and values will be
    assigned by increment of one. None of our code also rely on hardcoded
    value.
    
    [stefano: grammar fixes in commit message]
    
    Signed-off-by: Julien Grall <julien@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    CC: Andrii Anisov <andrii_anisov@xxxxxxxx>
---
 xen/arch/arm/gic.c        | 12 ++++++------
 xen/include/asm-arm/gic.h |  7 ++++---
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 113655a789..d623c57cb9 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -44,6 +44,12 @@ DEFINE_PER_CPU(uint64_t, lr_mask);
 
 const struct gic_hw_operations *gic_hw_ops;
 
+static void __init __maybe_unused build_assertions(void)
+{
+    /* Check our enum gic_sgi only covers SGIs */
+    BUILD_BUG_ON(GIC_SGI_MAX > NR_GIC_SGI);
+}
+
 void register_gic_ops(const struct gic_hw_operations *ops)
 {
     gic_hw_ops = ops;
@@ -294,8 +300,6 @@ void __init gic_init(void)
 
 void send_SGI_mask(const cpumask_t *cpumask, enum gic_sgi sgi)
 {
-    ASSERT(sgi < 16); /* There are only 16 SGIs */
-
     gic_hw_ops->send_SGI(sgi, SGI_TARGET_LIST, cpumask);
 }
 
@@ -306,15 +310,11 @@ void send_SGI_one(unsigned int cpu, enum gic_sgi sgi)
 
 void send_SGI_self(enum gic_sgi sgi)
 {
-    ASSERT(sgi < 16); /* There are only 16 SGIs */
-
     gic_hw_ops->send_SGI(sgi, SGI_TARGET_SELF, NULL);
 }
 
 void send_SGI_allbutself(enum gic_sgi sgi)
 {
-   ASSERT(sgi < 16); /* There are only 16 SGIs */
-
    gic_hw_ops->send_SGI(sgi, SGI_TARGET_OTHERS, NULL);
 }
 
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 793d324b33..ba870523bb 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -277,9 +277,10 @@ extern void gic_restore_state(struct vcpu *v);
 
 /* SGI (AKA IPIs) */
 enum gic_sgi {
-    GIC_SGI_EVENT_CHECK = 0,
-    GIC_SGI_DUMP_STATE  = 1,
-    GIC_SGI_CALL_FUNCTION = 2,
+    GIC_SGI_EVENT_CHECK,
+    GIC_SGI_DUMP_STATE,
+    GIC_SGI_CALL_FUNCTION,
+    GIC_SGI_MAX,
 };
 
 /* SGI irq mode types */
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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