On 16/04/18 15:27, Boris Ostrovsky wrote:
On 04/13/2018 06:11 PM, Laura Abbott wrote:
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);
Isn't dtr->size always either GDT_SIZE or 0?
GDT_SIZE - 1 :-)
- unsigned long frames[pages];
+ unsigned long frames[DIV_ROUND_UP(SZ_64K, PAGE_SIZE)];
So we could just go with one frame and modify the BUG_ON() further below
accordingly.
Juergen