[PATCH] powerpc: Support for generic tif bits

[PATCH] powerpc: Support for generic tif bits

[Mukesh Kumar Chaurasiya (IBM)]

After the support of generic irq entry/exit. powerpc is now ready to
use generic tif bits instead of arch specific ones.

Enable generic tif bits for powerpc arch.

Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
---
This patch is applicabe over
https://lore.kernel.org/all/961c058f3f3e03045552186c083a68a0fde3f43f.1791975972.git.msuchanek@suse.de/

 arch/powerpc/Kconfig                   |  1 +
 arch/powerpc/include/asm/thread_info.h | 36 +++++++++-----------------
 2 files changed, 13 insertions(+), 24 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 7f7910f38a67..e5527b56159a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -255,6 +255,7 @@ config PPC
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER		if !COMPILE_TEST && (PPC64 || (PPC32 && CC_IS_GCC))
 	select HAVE_GCC_PLUGINS
+	select HAVE_GENERIC_TIF_BITS
 	select HAVE_HARDLOCKUP_DETECTOR_ARCH	if PPC_BOOK3S_64 && SMP
 	select HAVE_HARDLOCKUP_DETECTOR_PERF	if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
 	select HAVE_HW_BREAKPOINT		if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 4b7ec1db3034..4df3f4b5bd56 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -93,44 +93,32 @@ void arch_setup_new_exec(void);
 
 #endif /* __ASSEMBLER__ */
 
+#define HAVE_TIF_NEED_RESCHED_LAZY
+
+#include <asm-generic/thread_info_tif.h>
 /*
  * thread information flag bit numbers
  */
-#define TIF_SIGPENDING		1	/* signal pending */
-#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_NOTIFY_SIGNAL	3	/* signal notifications exist */
-#define TIF_RESTORE_TM		5	/* need to restore TM FP/VEC/VSX */
-#define TIF_PATCH_PENDING	6	/* pending live patching update */
-#define TIF_SINGLESTEP		8	/* singlestepping active */
-#define TIF_NEED_RESCHED_LAZY	9       /* Scheduler driven lazy preemption */
-#define TIF_RESTOREALL		11	/* Restore all regs (implies NOERROR) */
-#define TIF_NOERROR		12	/* Force successful syscall return */
-#define TIF_NOTIFY_RESUME	13	/* callback before returning to user */
-#define TIF_UPROBE		14	/* breakpointed or single-stepping */
-#define TIF_EMULATE_STACK_STORE	16	/* Is an instruction emulation
+#define TIF_RESTORE_TM		16	/* need to restore TM FP/VEC/VSX */
+#define TIF_SINGLESTEP		17	/* singlestepping active */
+#define TIF_RESTOREALL		18	/* Restore all regs (implies NOERROR) */
+#define TIF_NOERROR		19	/* Force successful syscall return */
+#define TIF_EMULATE_STACK_STORE	20	/* Is an instruction emulation
 						for stack store? */
-#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
 #if defined(CONFIG_PPC64)
-#define TIF_ELF2ABI		18	/* function descriptors must die! */
+#define TIF_ELF2ABI		21	/* function descriptors must die! */
 #endif
-#define TIF_POLLING_NRFLAG	19	/* true if poll_idle() is polling TIF_NEED_RESCHED */
-#define TIF_32BIT		20	/* 32 bit binary */
-#define TIF_SYSCALL_RET		21	/* syscall error value set */
+#define TIF_POLLING_NRFLAG	22	/* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_32BIT		23	/* 32 bit binary */
+#define TIF_SYSCALL_RET		24	/* syscall error value set */
 
 /* as above, but as bit values */
-#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
-#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_NEED_RESCHED_LAZY	(1<<TIF_NEED_RESCHED_LAZY)
-#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_32BIT		(1<<TIF_32BIT)
 #define _TIF_RESTORE_TM		(1<<TIF_RESTORE_TM)
-#define _TIF_PATCH_PENDING	(1<<TIF_PATCH_PENDING)
 #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
 #define _TIF_RESTOREALL		(1<<TIF_RESTOREALL)
 #define _TIF_NOERROR		(1<<TIF_NOERROR)
-#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
-#define _TIF_UPROBE		(1<<TIF_UPROBE)
 #define _TIF_EMULATE_STACK_STORE	(1<<TIF_EMULATE_STACK_STORE)
 
 #define _TIF_USER_WORK_MASK	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
-- 
2.55.0

Re: [PATCH] powerpc: Support for generic tif bits

[Shrikanth Hegde]

Hi Mukesh.

On 10/21/26 8:14 PM, Mukesh Kumar Chaurasiya (IBM) wrote:
> After the support of generic irq entry/exit. powerpc is now ready to
> use generic tif bits instead of arch specific ones.
> 

This needs a better change log. The intent to enable the change is not
written. There are features that could be enabled with this. Please list
them. Also please try those features on powerpc to ensure it works as expected.

I think we could rseq time slice extention selftests if there is one. etc.

+cc  thomas.

PS: I am on parental leave for sometime. So expect delayed or no response at all.