[S390] implement is_compat_task

Implement is_compat_task and use it all over the place.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
index de065b3..01a0802 100644 (file)
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
@@ -5,6 +5,7 @@
  */
 #include <linux/types.h>
 #include <linux/sched.h>
+#include <linux/thread_info.h>
 
 #define PSW32_MASK_PER         0x40000000UL
 #define PSW32_MASK_DAT         0x04000000UL
@@ -163,12 +164,28 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
        return (u32)(unsigned long)uptr;
 }
 
+#ifdef CONFIG_COMPAT
+
+static inline int is_compat_task(void)
+{
+       return test_thread_flag(TIF_31BIT);
+}
+
+#else
+
+static inline int is_compat_task(void)
+{
+       return 0;
+}
+
+#endif
+
 static inline void __user *compat_alloc_user_space(long len)
 {
        unsigned long stack;
 
        stack = KSTK_ESP(current);
-       if (test_thread_flag(TIF_31BIT))
+       if (is_compat_task())
                stack &= 0x7fffffffUL;
        return (void __user *) (stack - len);
 }

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index a3acd8e..355f7a3 100644 (file)
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -32,6 +32,7 @@
 #include <linux/elfcore.h>
 #include <linux/kernel_stat.h>
 #include <linux/syscalls.h>
+#include <asm/compat.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
@@ -204,7 +205,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
        save_fp_regs(&p->thread.fp_regs);
        /* Set a new TLS ?  */
        if (clone_flags & CLONE_SETTLS) {
-               if (test_thread_flag(TIF_31BIT)) {
+               if (is_compat_task()) {
                        p->thread.acrs[0] = (unsigned int) regs->gprs[6];
                } else {
                        p->thread.acrs[0] = (unsigned int)(regs->gprs[6] >> 32);

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 75c496f..99eef17 100644 (file)
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -36,7 +36,7 @@
 #include <linux/elf.h>
 #include <linux/regset.h>
 #include <linux/tracehook.h>
-
+#include <linux/compat.h>
 #include <asm/segment.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
@@ -69,7 +69,7 @@ FixPerRegisters(struct task_struct *task)
        if (per_info->single_step) {
                per_info->control_regs.bits.starting_addr = 0;
 #ifdef CONFIG_COMPAT
-               if (test_thread_flag(TIF_31BIT))
+               if (is_compat_task())
                        per_info->control_regs.bits.ending_addr = 0x7fffffffUL;
                else
 #endif
@@ -482,8 +482,7 @@ static int peek_user_compat(struct task_struct *child,
 {
        __u32 tmp;
 
-       if (!test_thread_flag(TIF_31BIT) ||
-           (addr & 3) || addr > sizeof(struct user) - 3)
+       if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
                return -EIO;
 
        tmp = __peek_user_compat(child, addr);
@@ -584,8 +583,7 @@ static int __poke_user_compat(struct task_struct *child,
 static int poke_user_compat(struct task_struct *child,
                            addr_t addr, addr_t data)
 {
-       if (!test_thread_flag(TIF_31BIT) ||
-           (addr & 3) || addr > sizeof(struct user32) - 3)
+       if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3)
                return -EIO;
 
        return __poke_user_compat(child, addr, data);
@@ -660,7 +658,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
        }
 
        if (unlikely(current->audit_context))
-               audit_syscall_entry(test_thread_flag(TIF_31BIT) ?
+               audit_syscall_entry(is_compat_task() ?
                                        AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
                                    regs->gprs[2], regs->orig_gpr2,
                                    regs->gprs[3], regs->gprs[4],

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index 3cf74c3..062bd64 100644 (file)
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -26,6 +26,7 @@
 #include <linux/binfmts.h>
 #include <linux/tracehook.h>
 #include <linux/syscalls.h>
+#include <linux/compat.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/lowcore.h>
@@ -482,7 +483,7 @@ void do_signal(struct pt_regs *regs)
                /* Whee!  Actually deliver the signal.  */
                int ret;
 #ifdef CONFIG_COMPAT
-               if (test_thread_flag(TIF_31BIT)) {
+               if (is_compat_task()) {
                        ret = handle_signal32(signr, &ka, &info, oldset, regs);
                }
                else

diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 7b76ee4..45e1708 100644 (file)
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -22,7 +22,7 @@
 #include <linux/elf.h>
 #include <linux/security.h>
 #include <linux/bootmem.h>
-
+#include <linux/compat.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
 #include <asm/processor.h>
@@ -214,7 +214,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
        vdso_pagelist = vdso64_pagelist;
        vdso_pages = vdso64_pages;
 #ifdef CONFIG_COMPAT
-       if (test_thread_flag(TIF_31BIT)) {
+       if (is_compat_task()) {
                vdso_pagelist = vdso32_pagelist;
                vdso_pages = vdso32_pages;
        }

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 833e836..220a152 100644 (file)
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -19,6 +19,7 @@
 #include <linux/ptrace.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
+#include <linux/compat.h>
 #include <linux/smp.h>
 #include <linux/kdebug.h>
 #include <linux/smp_lock.h>
@@ -239,7 +240,7 @@ static int signal_return(struct mm_struct *mm, struct pt_regs *regs,
        up_read(&mm->mmap_sem);
        clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
 #ifdef CONFIG_COMPAT
-       compat = test_tsk_thread_flag(current, TIF_31BIT);
+       compat = is_compat_task();
        if (compat && instruction == 0x0a77)
                sys32_sigreturn();
        else if (compat && instruction == 0x0aad)

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index e008d23..f4558cc 100644 (file)
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -28,6 +28,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <asm/pgalloc.h>
+#include <asm/compat.h>
 
 /*
  * Top of mmap area (just below the process stack).
@@ -55,7 +56,7 @@ static inline int mmap_is_legacy(void)
        /*
         * Force standard allocation for 64 bit programs.
         */
-       if (!test_thread_flag(TIF_31BIT))
+       if (!is_compat_task())
                return 1;
 #endif
        return sysctl_legacy_va_layout ||
@@ -91,7 +92,7 @@ EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
 
 int s390_mmap_check(unsigned long addr, unsigned long len)
 {
-       if (!test_thread_flag(TIF_31BIT) &&
+       if (!is_compat_task() &&
            len >= TASK_SIZE && TASK_SIZE < (1UL << 53))
                return crst_table_upgrade(current->mm, 1UL << 53);
        return 0;
@@ -108,8 +109,7 @@ s390_get_unmapped_area(struct file *filp, unsigned long addr,
        area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
        if (!(area & ~PAGE_MASK))
                return area;
-       if (area == -ENOMEM &&
-           !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+       if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
                /* Upgrade the page table to 4 levels and retry. */
                rc = crst_table_upgrade(mm, 1UL << 53);
                if (rc)
@@ -131,8 +131,7 @@ s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
        area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
        if (!(area & ~PAGE_MASK))
                return area;
-       if (area == -ENOMEM &&
-           !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+       if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
                /* Upgrade the page table to 4 levels and retry. */
                rc = crst_table_upgrade(mm, 1UL << 53);
                if (rc)