[Xen-changelog] [xen staging] xen: Disallow variable length arrays

[patchbot@xxxxxxx]

commit 0ace362c8a8854b2256631d4edebb61d4238ddc3
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Mon Sep 17 15:49:14 2018 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Sep 25 11:59:32 2018 +0100

    xen: Disallow variable length arrays
    
    Variable length arrays result in excess stack utilisation, with a risk
    of stack overflow if the length is too large.  It also results in fairly
    poor asm generation, because of requiring a divide as part of the space
    calcuation.
    
    Xen no longer has any variable length arrays, so take the opportunity to
    formally disallow them.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/Rules.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/Rules.mk b/xen/Rules.mk
index ac0a8ea2e9..9c697dc57b 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -55,6 +55,7 @@ endif
 
 CFLAGS += -nostdinc -fno-builtin -fno-common
 CFLAGS += -Werror -Wredundant-decls -Wno-pointer-arith
+$(call cc-option-add,CFLAGS,CC,-Wvla)
 CFLAGS += -pipe -D__XEN__ -include $(BASEDIR)/include/xen/config.h
 CFLAGS-$(CONFIG_DEBUG_INFO) += -g
 CFLAGS += '-D__OBJECT_FILE__="$@"'
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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