[patch V4 35/36] riscv: Use generic TIF bits

Thomas Gleixner
2025-09-08T21:32:41Z

No point in defining generic items and the upcoming RSEQ optimizations are
only available with this _and_ the generic entry infrastructure, which is
already used by RISCV. So no further action required here.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>

---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/thread_info.h | 29 ++++++++++++-----------------
2 files changed, 13 insertions(+), 17 deletions(-)

--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -161,6 +161,7 @@ config RISCV
select HAVE_FUNCTION_GRAPH_FREGS
select HAVE_FUNCTION_TRACER if !XIP_KERNEL && HAVE_DYNAMIC_FTRACE
select HAVE_EBPF_JIT if MMU
+ select HAVE_GENERIC_TIF_BITS
select HAVE_GUP_FAST if MMU
select HAVE_FUNCTION_ARG_ACCESS_API
select HAVE_FUNCTION_ERROR_INJECTION
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -107,23 +107,18 @@ int arch_dup_task_struct(struct task_str
* - pending work-to-be-done flags are in lowest half-word
* - other flags in upper half-word(s)
*/
-#define TIF_NEED_RESCHED 0 /* rescheduling necessary */
-#define TIF_NEED_RESCHED_LAZY 1 /* Lazy rescheduling needed */
-#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
-#define TIF_SIGPENDING 3 /* signal pending */
-#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
-#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
-#define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */
-#define TIF_UPROBE 10 /* uprobe breakpoint or singlestep */
-#define TIF_32BIT 11 /* compat-mode 32bit process */
-#define TIF_RISCV_V_DEFER_RESTORE 12 /* restore Vector before returing to user */

-#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
-#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
-#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
-#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
-#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
-#define _TIF_UPROBE (1 << TIF_UPROBE)
-#define _TIF_RISCV_V_DEFER_RESTORE (1 << TIF_RISCV_V_DEFER_RESTORE)
+/*
+ * Tell the generic TIF infrastructure which bits riscv supports
+ */
+#define HAVE_TIF_NEED_RESCHED_LAZY
+#define HAVE_TIF_RESTORE_SIGMASK
+
+#include <asm-generic/thread_info_tif.h>
+
+#define TIF_32BIT 16 /* compat-mode 32bit process */
+#define TIF_RISCV_V_DEFER_RESTORE 17 /* restore Vector before returing to user */
+
+#define _TIF_RISCV_V_DEFER_RESTORE BIT(TIF_RISCV_V_DEFER_RESTORE)

#endif /* _ASM_RISCV_THREAD_INFO_H */