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Subject[PATCH v2 6/7] x86/trivial: Use is_ia32_compat_task
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

There are several instances in the arch/x86 code where we check if a task is
32 bit. However in most cases, this check has to be in #ifdef code.

This change provides a is_ia32_compat_task macro that can be called without
the #ifdef.

This is pure cleanup, no functional change intended.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
arch/x86/include/asm/compat.h | 31 +++++++++++++----------------
arch/x86/include/asm/elf.h | 9 +++-----
arch/x86/include/asm/syscall.h | 9 +++-----
arch/x86/kernel/cpu/perf_event_intel_ds.c | 5 ++---
arch/x86/kernel/process_64.c | 13 +++++-------
arch/x86/kernel/ptrace.c | 27 ++++++-------------------
arch/x86/kernel/signal.c | 10 ++-------
include/linux/compat.h | 4 +++-
8 files changed, 38 insertions(+), 70 deletions(-)

diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index ba9e9dc..2a73336 100644
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -13,6 +13,12 @@
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "i686\0\0"

+#ifdef CONFIG_X86_32
+# define is_ia32_compat_task(t) 1
+#else
+# define is_ia32_compat_task(t) (test_tsk_thread_flag(t, TIF_IA32))
+#endif
+
typedef u32 compat_size_t;
typedef s32 compat_ssize_t;
typedef s32 compat_time_t;
@@ -221,36 +227,25 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
return (u32)(unsigned long)uptr;
}

-#ifdef CONFIG_x86_64
static inline void __user *arch_compat_alloc_user_space(long len)
{
compat_uptr_t sp;

- if (test_thread_flag(TIF_IA32)) {
- sp = task_pt_regs(current)->sp;
- } else {
+ sp = task_pt_regs(current)->sp;
+#ifdef CONFIG_x86_64
+ if (!is_ia32_compat_task(current))
/* -128 for the x32 ABI redzone */
sp = percpu_read(old_rsp) - 128;
- }
+#endif

return (void __user *)round_down(sp - len, 16);
}
-#else
-
-static inline void __user *arch_compat_alloc_user_space(long len)
-{
- struct pt_regs *regs = task_pt_regs(current);
- return (void __user *)regs->sp - len;
-}
-
-#endif

static inline bool is_ia32_task(void)
{
-#ifdef CONFIG_IA32_EMULATION
- if (current_thread_info()->status & TS_COMPAT)
+ if (is_ia32_compat_task(current))
return true;
-#endif
+
return false;
}

@@ -263,6 +258,8 @@ static inline bool is_x32_task(void)
return false;
}

+#undef is_compat_task
+
static inline bool is_compat_task(void)
{
return is_ia32_task() || is_x32_task();
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 1e40634..d9805c6 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -9,6 +9,7 @@
#include <asm/ptrace.h>
#include <asm/user.h>
#include <asm/auxvec.h>
+#include <asm/compat.h>

typedef unsigned long elf_greg_t;

@@ -345,13 +346,9 @@ extern unsigned long arch_randomize_brk(struct mm_struct *mm);
*/
static inline int mmap_is_ia32(void)
{
-#ifdef CONFIG_X86_32
- return 1;
-#endif
-#ifdef CONFIG_IA32_EMULATION
- if (test_thread_flag(TIF_ADDR32))
+ if (is_ia32_compat_task(current))
return 1;
-#endif
+
return 0;
}

diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index 386b786..fabcd0e 100644
--- a/arch/x86/include/asm/syscall.h
+++ b/arch/x86/include/asm/syscall.h
@@ -17,6 +17,7 @@
#include <linux/err.h>
#include <asm/asm-offsets.h> /* For NR_syscalls */
#include <asm/unistd.h>
+#include <asm/compat.h>

extern const unsigned long sys_call_table[];

@@ -95,8 +96,7 @@ static inline void syscall_get_arguments(struct task_struct *task,
unsigned int i, unsigned int n,
unsigned long *args)
{
-# ifdef CONFIG_IA32_EMULATION
- if (task_thread_info(task)->status & TS_COMPAT)
+ if (is_ia32_compat_task(task))
switch (i) {
case 0:
if (!n--) break;
@@ -123,7 +123,6 @@ static inline void syscall_get_arguments(struct task_struct *task,
break;
}
else
-# endif
switch (i) {
case 0:
if (!n--) break;
@@ -156,8 +155,7 @@ static inline void syscall_set_arguments(struct task_struct *task,
unsigned int i, unsigned int n,
const unsigned long *args)
{
-# ifdef CONFIG_IA32_EMULATION
- if (task_thread_info(task)->status & TS_COMPAT)
+ if (is_ia32_compat_task(task))
switch (i) {
case 0:
if (!n--) break;
@@ -184,7 +182,6 @@ static inline void syscall_set_arguments(struct task_struct *task,
break;
}
else
-# endif
switch (i) {
case 0:
if (!n--) break;
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 7f64df1..14ab22e 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -4,6 +4,7 @@

#include <asm/perf_event.h>
#include <asm/insn.h>
+#include <asm/compat.h>

#include "perf_event.h"

@@ -528,9 +529,7 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
} else
kaddr = (void *)to;

-#ifdef CONFIG_X86_64
- is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32);
-#endif
+ is_64bit = kernel_ip(to) || !is_ia32_compat_task(current);
insn_init(&insn, kaddr, is_64bit);
insn_get_length(&insn);
to += insn.length;
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 1deb467..37a7715 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -53,6 +53,7 @@
#include <asm/syscalls.h>
#include <asm/debugreg.h>
#include <asm/nmi.h>
+#include <asm/compat.h>

asmlinkage extern void ret_from_fork(void);

@@ -295,7 +296,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
savesegment(es, p->thread.es);
savesegment(ds, p->thread.ds);

- err = -ENOMEM;
+ err = 0;
memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));

if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
@@ -312,18 +313,14 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
* Set a new TLS for the child thread?
*/
if (clone_flags & CLONE_SETTLS) {
-#ifdef CONFIG_IA32_EMULATION
- if (test_thread_flag(TIF_IA32))
+ if (is_ia32_compat_task(current))
err = do_set_thread_area(p, -1,
(struct user_desc __user *)childregs->si, 0);
else
-#endif
err = do_arch_prctl(p, ARCH_SET_FS, childregs->r8);
- if (err)
- goto out;
+
}
- err = 0;
-out:
+
if (err && p->thread.io_bitmap_ptr) {
kfree(p->thread.io_bitmap_ptr);
p->thread.io_bitmap_max = 0;
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 52c06b1..76b5194 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -35,6 +35,7 @@
#include <asm/proto.h>
#include <asm/hw_breakpoint.h>
#include <asm/traps.h>
+#include <asm/compat.h>

#include "tls.h"

@@ -333,18 +334,14 @@ static int set_segment_reg(struct task_struct *task,
case offsetof(struct user_regs_struct,cs):
if (unlikely(value == 0))
return -EIO;
-#ifdef CONFIG_IA32_EMULATION
- if (test_tsk_thread_flag(task, TIF_IA32))
+ if (is_ia32_compat_task(task))
task_pt_regs(task)->cs = value;
-#endif
break;
case offsetof(struct user_regs_struct,ss):
if (unlikely(value == 0))
return -EIO;
-#ifdef CONFIG_IA32_EMULATION
- if (test_tsk_thread_flag(task, TIF_IA32))
+ if (is_ia32_compat_task(task))
task_pt_regs(task)->ss = value;
-#endif
break;
}

@@ -1411,13 +1408,10 @@ void update_regset_xstate_info(unsigned int size, u64 xstate_mask)

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
-#ifdef CONFIG_IA32_EMULATION
- if (test_tsk_thread_flag(task, TIF_IA32))
-#endif
+ if (is_ia32_compat_task(task))
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
return &user_x86_32_view;
-#endif
-#ifdef CONFIG_X86_64
+#else
return &user_x86_64_view;
#endif
}
@@ -1453,15 +1447,6 @@ void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
force_sig_info(SIGTRAP, &info, tsk);
}

-
-#ifdef CONFIG_X86_32
-# define IS_IA32 1
-#elif defined CONFIG_IA32_EMULATION
-# define IS_IA32 is_compat_task()
-#else
-# define IS_IA32 0
-#endif
-
/*
* We must return the syscall number to actually look up in the table.
* This can be -1L to skip running any syscall at all.
@@ -1493,7 +1478,7 @@ long syscall_trace_enter(struct pt_regs *regs)
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_enter(regs, regs->orig_ax);

- if (IS_IA32)
+ if (is_ia32_compat_task(current))
audit_syscall_entry(AUDIT_ARCH_I386,
regs->orig_ax,
regs->bx, regs->cx,
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 115eac4..30108c1 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -37,6 +37,7 @@
#include <asm/syscalls.h>

#include <asm/sigframe.h>
+#include <asm/compat.h>

#ifdef CONFIG_X86_32
# define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF)
@@ -622,18 +623,11 @@ static int signr_convert(int sig)

#ifdef CONFIG_X86_32

-#define is_ia32 1
#define ia32_setup_frame __setup_frame
#define ia32_setup_rt_frame __setup_rt_frame

#else /* !CONFIG_X86_32 */

-#ifdef CONFIG_IA32_EMULATION
-#define is_ia32 test_thread_flag(TIF_IA32)
-#else /* !CONFIG_IA32_EMULATION */
-#define is_ia32 0
-#endif /* CONFIG_IA32_EMULATION */
-
#ifdef CONFIG_X86_X32_ABI
#define is_x32 test_thread_flag(TIF_X32)

@@ -663,7 +657,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
set = &current->saved_sigmask;

/* Set up the stack frame */
- if (is_ia32) {
+ if (is_ia32_compat_task(current)) {
if (ka->sa.sa_flags & SA_SIGINFO)
ret = ia32_setup_rt_frame(usig, ka, info, set, regs);
else
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 710446f..bc298f0 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -583,7 +583,9 @@ asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,

#else

-#define is_compat_task() (0)
+#ifndef is_compat_task
+# define is_compat_task() (0)
+#endif

#endif /* CONFIG_COMPAT */
#endif /* _LINUX_COMPAT_H */



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