From b11b53342773361f3353b285eb6a3fd6074e7997 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 7 Dec 2009 12:51:43 +0100 Subject: [S390] Improve address space mode selection. Introduce user_mode to replace the two variables switch_amode and s390_noexec. There are three valid combinations of the old values: 1) switch_amode == 0 && s390_noexec == 0 2) switch_amode == 1 && s390_noexec == 0 3) switch_amode == 1 && s390_noexec == 1 They get replaced by 1) user_mode == HOME_SPACE_MODE 2) user_mode == PRIMARY_SPACE_MODE 3) user_mode == SECONDARY_SPACE_MODE The new kernel parameter user_mode=[primary,secondary,home] lets you choose the address space mode the user space processes should use. In addition the CONFIG_S390_SWITCH_AMODE config option is removed. Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/mmu_context.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/s390/include/asm/mmu_context.h') diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index fc7edd6f41b6..976e273988c2 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -36,7 +36,7 @@ static inline int init_new_context(struct task_struct *tsk, mm->context.has_pgste = 1; mm->context.alloc_pgste = 1; } else { - mm->context.noexec = s390_noexec; + mm->context.noexec = (user_mode == SECONDARY_SPACE_MODE); mm->context.has_pgste = 0; mm->context.alloc_pgste = 0; } @@ -58,7 +58,7 @@ static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk) pgd_t *pgd = mm->pgd; S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd); - if (switch_amode) { + if (user_mode != HOME_SPACE_MODE) { /* Load primary space page table origin. */ pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd; S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd); -- cgit v1.2.3