[Xen-devel] [PATCH] x86/xen: Remove use of VLAs

[Laura Abbott <labbott@xxxxxxxxxx>]

There's an ongoing effort to remove VLAs[1] from the kernel to eventually
turn on -Wvla. The few VLAs in use have an upper bound based on a size
of 64K. This doesn't produce an excessively large stack so just switch
the upper bound.

[1] https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
---
 arch/x86/xen/enlighten_pv.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index c36d23aa6c35..d96a5a535cbb 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -421,8 +421,7 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
 {
        unsigned long va = dtr->address;
        unsigned int size = dtr->size + 1;
-       unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
-       unsigned long frames[pages];
+       unsigned long frames[DIV_ROUND_UP(SZ_64K, PAGE_SIZE)];
        int f;
 
        /*
@@ -470,8 +469,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr 
*dtr)
 {
        unsigned long va = dtr->address;
        unsigned int size = dtr->size + 1;
-       unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
-       unsigned long frames[pages];
+       unsigned long frames[DIV_ROUND_UP(SZ_64K, PAGE_SIZE)];
        int f;
 
        /*
-- 
2.14.3


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