x86: vdso: Fix build with older gcc

gcc-4.4.4:

arch/x86/vdso/vma.c: In function 'vgetcpu_cpu_init':
arch/x86/vdso/vma.c:247: error: unknown field 'limit0' specified in initializer
arch/x86/vdso/vma.c:247: warning: missing braces around initializer
arch/x86/vdso/vma.c:247: warning: (near initialization for '(anonymous).<anonymous>')
arch/x86/vdso/vma.c:248: error: unknown field 'limit' specified in initializer
arch/x86/vdso/vma.c:248: warning: excess elements in struct initializer
arch/x86/vdso/vma.c:248: warning: (near initialization for '(anonymous)')
....

I couldn't find any way of tricking it into accepting an initializer
format :(

Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Fixes: 258801563b ("x86/vdso: Change the PER_CPU segment to use struct desc_struct")
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 8 insertions, 10 deletions

diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index a280b11e2122..009495b9ab4b 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -230,7 +230,7 @@ __setup("vdso=", vdso_setup);
 static void vgetcpu_cpu_init(void *arg)
 {
         int cpu = smp_processor_id();
-        struct desc_struct d;
+        struct desc_struct d = { };
         unsigned long node = 0;
 #ifdef CONFIG_NUMA
         node = cpu_to_node(cpu);
@@ -243,15 +243,13 @@ static void vgetcpu_cpu_init(void *arg)
          * quickly in user space in vgetcpu. (12 bits for the CPU
          * and 8 bits for the node)
          */
-        d = (struct desc_struct) {
-                .limit0 = cpu | ((node & 0xf) << 12),
-                .limit = node >> 4,
-                .type = 5,              /* RO data, expand down, accessed */
-                .dpl = 3,               /* Visible to user code */
-                .s = 1,                 /* Not a system segment */
-                .p = 1,                 /* Present */
-                .d = 1,                 /* 32-bit */
-        };
+        d.limit0 = cpu | ((node & 0xf) << 12);
+        d.limit = node >> 4;
+        d.type = 5;             /* RO data, expand down, accessed */
+        d.dpl = 3;              /* Visible to user code */
+        d.s = 1;                /* Not a system segment */
+        d.p = 1;                /* Present */
+        d.d = 1;                /* 32-bit */
 
         write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S);
 }