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powerpc: Pull out ksp_vsid logic into a helper 

The previous patch left a bit of a wart in copy_process(). Clean it up a
bit by moving the logic out into a helper.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2014-07-10 12:29:21 +10:00 committed by Benjamin Herrenschmidt
parent 13b3d13b81
commit cec15488c7
1 changed files with 18 additions and 14 deletions
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32
arch/powerpc/kernel/process.c
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@ -1095,6 +1095,23 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
return 0;
}
static void setup_ksp_vsid(struct task_struct *p, unsigned long sp)
{
#ifdef CONFIG_PPC_STD_MMU_64
unsigned long sp_vsid;
unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp;
if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T)
<< SLB_VSID_SHIFT_1T;
else
sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M)
<< SLB_VSID_SHIFT;
sp_vsid |= SLB_VSID_KERNEL | llp;
p->thread.ksp_vsid = sp_vsid;
#endif
}
/*
* Copy a thread..
*/
@ -1174,21 +1191,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
p->thread.vr_save_area = NULL;
#endif
#ifdef CONFIG_PPC_STD_MMU_64
{
unsigned long sp_vsid;
unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp;
setup_ksp_vsid(p, sp);
if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T)
<< SLB_VSID_SHIFT_1T;
else
sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M)
<< SLB_VSID_SHIFT;
sp_vsid |= SLB_VSID_KERNEL | llp;
p->thread.ksp_vsid = sp_vsid;
}
#endif /* CONFIG_PPC_STD_MMU_64 */
#ifdef CONFIG_PPC64
if (cpu_has_feature(CPU_FTR_DSCR)) {
p->thread.dscr_inherit = current->thread.dscr_inherit;