[PATCH] x86_64: Align and pad x86_64 GDT on page boundary

This patch is on the same lines as Zachary Amsden's i386 GDT page alignemnt
patch in -mm, but for x86_64.

Patch to align and pad x86_64 GDT on page boundries.

[AK: some minor cleanups and fixed incorrect TLS initialization
in CPU init.]

Signed-off-by: Nippun Goel <nippung@calsoftinc.com>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index f513dacc177f..e6af93b51dce 100644
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -744,6 +744,13 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
         };
         DECLARE_WORK(work, do_fork_idle, &c_idle);
 
+        /* allocate memory for gdts of secondary cpus. Hotplug is considered */
+        if (!cpu_gdt_descr[cpu].address &&
+                !(cpu_gdt_descr[cpu].address = get_zeroed_page(GFP_KERNEL))) {
+                printk(KERN_ERR "Failed to allocate GDT for CPU %d\n", cpu);
+                return -1;
+        }
+
         c_idle.idle = get_idle_for_cpu(cpu);
 
         if (c_idle.idle) {