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Subject[patch 25/50] [stable] [stable patch] i386: CPU hotplug broken with 2GB VMSPLIT
-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Shaohua Li <shaohua.li@intel.com>

In VMSPLIT mode, kernel PGD might have more entries than user space

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
arch/i386/kernel/smpboot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.19.1.orig/arch/i386/kernel/smpboot.c
+++ linux-2.6.19.1/arch/i386/kernel/smpboot.c
@@ -1095,7 +1095,7 @@ static int __cpuinit __smp_prepare_cpu(i

/* init low mem mapping */
clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
- KERNEL_PGD_PTRS);
+ min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS));
flush_tlb_all();
schedule_work(&task);
wait_for_completion(&done);
--
-
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