1 files changed, 12 insertions, 14 deletions

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index ae924c416b68..905364d42847 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -56,6 +56,7 @@
 
 #include <asm/tlbflush.h>
 #include <asm/cpu.h>
+#include <asm/pda.h>
 
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 
@@ -346,6 +347,7 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 
         regs.xds = __USER_DS;
         regs.xes = __USER_DS;
+        regs.xgs = __KERNEL_PDA;
         regs.orig_eax = -1;
         regs.eip = (unsigned long) kernel_thread_helper;
         regs.xcs = __KERNEL_CS | get_kernel_rpl();
@@ -431,7 +433,6 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
         p->thread.eip = (unsigned long) ret_from_fork;
 
         savesegment(fs,p->thread.fs);
-        savesegment(gs,p->thread.gs);
 
         tsk = current;
         if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
@@ -659,16 +660,16 @@ struct task_struct fastcall * __switch_to(struct task_struct *prev_p, struct tas
         load_esp0(tss, next);
 
         /*
-         * Save away %fs and %gs. No need to save %es and %ds, as
-         * those are always kernel segments while inside the kernel.
-         * Doing this before setting the new TLS descriptors avoids
-         * the situation where we temporarily have non-reloadable
-         * segments in %fs and %gs.  This could be an issue if the
-         * NMI handler ever used %fs or %gs (it does not today), or
-         * if the kernel is running inside of a hypervisor layer.
+         * Save away %fs. No need to save %gs, as it was saved on the
+         * stack on entry.  No need to save %es and %ds, as those are
+         * always kernel segments while inside the kernel.  Doing this
+         * before setting the new TLS descriptors avoids the situation
+         * where we temporarily have non-reloadable segments in %fs
+         * and %gs.  This could be an issue if the NMI handler ever
+         * used %fs or %gs (it does not today), or if the kernel is
+         * running inside of a hypervisor layer.
          */
         savesegment(fs, prev->fs);
-        savesegment(gs, prev->gs);
 
         /*
          * Load the per-thread Thread-Local Storage descriptor.
@@ -676,16 +677,13 @@ struct task_struct fastcall * __switch_to(struct task_struct *prev_p, struct tas
         load_TLS(next, cpu);
 
         /*
-         * Restore %fs and %gs if needed.
+         * Restore %fs if needed.
          *
-         * Glibc normally makes %fs be zero, and %gs is one of
-         * the TLS segments.
+         * Glibc normally makes %fs be zero.
          */
         if (unlikely(prev->fs | next->fs))
                 loadsegment(fs, next->fs);
 
-        if (prev->gs | next->gs)
-                loadsegment(gs, next->gs);
 
         /*
          * Restore IOPL if needed.