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Diffstat (limited to 'arch/powerpc/kernel/process.c')
-rw-r--r--arch/powerpc/kernel/process.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index f74f355a961..095043d7994 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -702,6 +702,8 @@ void prepare_to_copy(struct task_struct *tsk)
/*
* Copy a thread..
*/
+extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */
+
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long unused, struct task_struct *p,
struct pt_regs *regs)
@@ -755,11 +757,11 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
_ALIGN_UP(sizeof(struct thread_info), 16);
#ifdef CONFIG_PPC_STD_MMU_64
- if (cpu_has_feature(CPU_FTR_SLB)) {
+ if (mmu_has_feature(MMU_FTR_SLB)) {
unsigned long sp_vsid;
unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp;
- if (cpu_has_feature(CPU_FTR_1T_SEGMENT))
+ if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T)
<< SLB_VSID_SHIFT_1T;
else
@@ -769,6 +771,20 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
p->thread.ksp_vsid = sp_vsid;
}
#endif /* CONFIG_PPC_STD_MMU_64 */
+#ifdef CONFIG_PPC64
+ if (cpu_has_feature(CPU_FTR_DSCR)) {
+ if (current->thread.dscr_inherit) {
+ p->thread.dscr_inherit = 1;
+ p->thread.dscr = current->thread.dscr;
+ } else if (0 != dscr_default) {
+ p->thread.dscr_inherit = 1;
+ p->thread.dscr = dscr_default;
+ } else {
+ p->thread.dscr_inherit = 0;
+ p->thread.dscr = 0;
+ }
+ }
+#endif
/*
* The PPC64 ABI makes use of a TOC to contain function