[Patch v4 12/18] x86: Group thread info flags by functionality

[Tim Chen]

The thread info flags are currently randomly distributed in the header
file arch/x86/include/asm/thread_info.h.

This patch groups the TIF flags according to these functionalities:
operation mode, syscall mode, pending work, task status and security
status.

Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/thread_info.h | 93 ++++++++++++++++++++++----------------
 1 file changed, 54 insertions(+), 39 deletions(-)

diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 523c69e..60798a0 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -74,58 +74,73 @@ struct thread_info {
  * - these are process state flags that various assembly files
  *   may need to access
  */
-#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
-#define TIF_SIGPENDING		2	/* signal pending */
-#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
-#define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
-#define TIF_SSBD		5	/* Speculative store bypass disable */
-#define TIF_SYSCALL_EMU		6	/* syscall emulation active */
-#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
-#define TIF_SECCOMP		8	/* secure computing */
-#define TIF_USER_RETURN_NOTIFY	11	/* notify kernel of userspace return */
-#define TIF_UPROBE		12	/* breakpointed or singlestepping */
-#define TIF_PATCH_PENDING	13	/* pending live patching update */
-#define TIF_NOCPUID		15	/* CPUID is not accessible in userland */
-#define TIF_NOTSC		16	/* TSC is not accessible in userland */
-#define TIF_IA32		17	/* IA32 compatibility process */
-#define TIF_NOHZ		19	/* in adaptive nohz mode */
-#define TIF_MEMDIE		20	/* is terminating due to OOM killer */
-#define TIF_POLLING_NRFLAG	21	/* idle is polling for TIF_NEED_RESCHED */
-#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
-#define TIF_FORCED_TF		24	/* true if TF in eflags artificially */
-#define TIF_BLOCKSTEP		25	/* set when we want DEBUGCTLMSR_BTF */
-#define TIF_LAZY_MMU_UPDATES	27	/* task is updating the mmu lazily */
-#define TIF_SYSCALL_TRACEPOINT	28	/* syscall tracepoint instrumentation */
-#define TIF_ADDR32		29	/* 32-bit address space on 64 bits */
-#define TIF_X32			30	/* 32-bit native x86-64 binary */
-#define TIF_FSCHECK		31	/* Check FS is USER_DS on return */
+
+/* Operation mode */
+#define TIF_NOCPUID		0	/* CPUID is not accessible in userland */
+#define TIF_NOTSC		1	/* TSC is not accessible in userland */
+#define TIF_IA32		2	/* IA32 compatibility process */
+#define TIF_NOHZ		3	/* In adaptive nohz mode */
+#define TIF_ADDR32		4	/* 32-bit address space on 64 bits */
+#define TIF_X32			5	/* 32-bit native x86-64 binary */
+
+/* Syscall mode */
+#define TIF_SYSCALL_TRACE	6	/* Syscall trace active */
+#define TIF_SYSCALL_EMU		7	/* Syscall emulation active */
+#define TIF_SYSCALL_AUDIT	8	/* Syscall auditing active */
+#define TIF_SYSCALL_TRACEPOINT	9	/* Syscall tracepoint instrumentation */
+
+/* Pending work */
+#define TIF_NOTIFY_RESUME	10	/* Callback before returning to user */
+#define TIF_SIGPENDING		11	/* Signal pending */
+#define TIF_NEED_RESCHED	12	/* Rescheduling necessary */
+#define TIF_SINGLESTEP		13	/* Reenable singlestep on user return*/
+#define TIF_USER_RETURN_NOTIFY	14	/* Notify kernel of userspace return */
+#define TIF_PATCH_PENDING	15	/* Pending live patching update */
+#define TIF_FSCHECK		16	/* Check FS is USER_DS on return */
+
+/* Task status */
+#define TIF_UPROBE		18	/* Breakpointed or singlestepping */
+#define TIF_MEMDIE		19	/* Is terminating due to OOM killer */
+#define TIF_POLLING_NRFLAG	20	/* Idle is polling for TIF_NEED_RESCHED */
+#define TIF_IO_BITMAP		21	/* Uses I/O bitmap */
+#define TIF_FORCED_TF		22	/* True if TF in eflags artificially */
+#define TIF_BLOCKSTEP		23	/* Set when we want DEBUGCTLMSR_BTF */
+#define TIF_LAZY_MMU_UPDATES	24	/* Task is updating the mmu lazily */
+
+/* Security mode */
+#define TIF_SECCOMP		25	/* Secure computing */
+#define TIF_SSBD		26	/* Speculative store bypass disable */
+
+#define _TIF_NOCPUID		(1 << TIF_NOCPUID)
+#define _TIF_NOTSC		(1 << TIF_NOTSC)
+#define _TIF_IA32		(1 << TIF_IA32)
+#define _TIF_NOHZ		(1 << TIF_NOHZ)
+#define _TIF_ADDR32		(1 << TIF_ADDR32)
+#define _TIF_X32		(1 << TIF_X32)
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
+#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
+
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
-#define _TIF_SSBD		(1 << TIF_SSBD)
-#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
-#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
-#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
 #define _TIF_USER_RETURN_NOTIFY	(1 << TIF_USER_RETURN_NOTIFY)
-#define _TIF_UPROBE		(1 << TIF_UPROBE)
 #define _TIF_PATCH_PENDING	(1 << TIF_PATCH_PENDING)
-#define _TIF_NOCPUID		(1 << TIF_NOCPUID)
-#define _TIF_NOTSC		(1 << TIF_NOTSC)
-#define _TIF_IA32		(1 << TIF_IA32)
-#define _TIF_NOHZ		(1 << TIF_NOHZ)
+#define _TIF_FSCHECK		(1 << TIF_FSCHECK)
+
+#define _TIF_UPROBE		(1 << TIF_UPROBE)
+#define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
 #define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
 #define _TIF_BLOCKSTEP		(1 << TIF_BLOCKSTEP)
 #define _TIF_LAZY_MMU_UPDATES	(1 << TIF_LAZY_MMU_UPDATES)
-#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
-#define _TIF_ADDR32		(1 << TIF_ADDR32)
-#define _TIF_X32		(1 << TIF_X32)
-#define _TIF_FSCHECK		(1 << TIF_FSCHECK)
+
+#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+#define _TIF_SSBD		(1 << TIF_SSBD)
 
 /*
  * work to do in syscall_trace_enter().  Also includes TIF_NOHZ for
-- 
2.9.4