From 01997497f915e8f79871f3f2acb55ac465051d24 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:59 +0200
Subject: Adding debian version 6.1.76-1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 ...7-powerpc-Add-support-for-lazy-preemption.patch | 118 +++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 debian/patches-rt/0037-powerpc-Add-support-for-lazy-preemption.patch

(limited to 'debian/patches-rt/0037-powerpc-Add-support-for-lazy-preemption.patch')

diff --git a/debian/patches-rt/0037-powerpc-Add-support-for-lazy-preemption.patch b/debian/patches-rt/0037-powerpc-Add-support-for-lazy-preemption.patch
new file mode 100644
index 000000000..bf8022c6c
--- /dev/null
+++ b/debian/patches-rt/0037-powerpc-Add-support-for-lazy-preemption.patch
@@ -0,0 +1,118 @@
+From 65e31d7b980c1413f19fcb84234387f97b09588f Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Thu, 1 Nov 2012 10:14:11 +0100
+Subject: [PATCH 37/62] powerpc: Add support for lazy preemption
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.1/older/patches-6.1.69-rt21.tar.xz
+
+Implement the powerpc pieces for lazy preempt.
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ arch/powerpc/Kconfig                   | 1 +
+ arch/powerpc/include/asm/thread_info.h | 8 ++++++++
+ arch/powerpc/kernel/interrupt.c        | 8 ++++++--
+ 3 files changed, 15 insertions(+), 2 deletions(-)
+
+diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
+index 6050e6e10d32..0eff864d6ec3 100644
+--- a/arch/powerpc/Kconfig
++++ b/arch/powerpc/Kconfig
+@@ -242,6 +242,7 @@ config PPC
+ 	select HAVE_PERF_EVENTS_NMI		if PPC64
+ 	select HAVE_PERF_REGS
+ 	select HAVE_PERF_USER_STACK_DUMP
++	select HAVE_PREEMPT_LAZY
+ 	select HAVE_REGS_AND_STACK_ACCESS_API
+ 	select HAVE_RELIABLE_STACKTRACE
+ 	select HAVE_RSEQ
+diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
+index af58f1ed3952..520864de8bb2 100644
+--- a/arch/powerpc/include/asm/thread_info.h
++++ b/arch/powerpc/include/asm/thread_info.h
+@@ -53,6 +53,8 @@
+ struct thread_info {
+ 	int		preempt_count;		/* 0 => preemptable,
+ 						   <0 => BUG */
++	int		preempt_lazy_count;	/* 0 => preemptable,
++						   <0 => BUG */
+ #ifdef CONFIG_SMP
+ 	unsigned int	cpu;
+ #endif
+@@ -77,6 +79,7 @@ struct thread_info {
+ #define INIT_THREAD_INFO(tsk)			\
+ {						\
+ 	.preempt_count = INIT_PREEMPT_COUNT,	\
++	.preempt_lazy_count = 0,		\
+ 	.flags =	0,			\
+ }
+ 
+@@ -102,6 +105,7 @@ void arch_setup_new_exec(void);
+ #define TIF_PATCH_PENDING	6	/* pending live patching update */
+ #define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
+ #define TIF_SINGLESTEP		8	/* singlestepping active */
++#define TIF_NEED_RESCHED_LAZY	9	/* lazy rescheduling necessary */
+ #define TIF_SECCOMP		10	/* secure computing */
+ #define TIF_RESTOREALL		11	/* Restore all regs (implies NOERROR) */
+ #define TIF_NOERROR		12	/* Force successful syscall return */
+@@ -117,6 +121,7 @@ void arch_setup_new_exec(void);
+ #define TIF_POLLING_NRFLAG	19	/* true if poll_idle() is polling TIF_NEED_RESCHED */
+ #define TIF_32BIT		20	/* 32 bit binary */
+ 
++
+ /* as above, but as bit values */
+ #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+ #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
+@@ -128,6 +133,7 @@ void arch_setup_new_exec(void);
+ #define _TIF_PATCH_PENDING	(1<<TIF_PATCH_PENDING)
+ #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
+ #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
++#define _TIF_NEED_RESCHED_LAZY	(1<<TIF_NEED_RESCHED_LAZY)
+ #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
+ #define _TIF_RESTOREALL		(1<<TIF_RESTOREALL)
+ #define _TIF_NOERROR		(1<<TIF_NOERROR)
+@@ -141,10 +147,12 @@ void arch_setup_new_exec(void);
+ 				 _TIF_SYSCALL_EMU)
+ 
+ #define _TIF_USER_WORK_MASK	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
++				 _TIF_NEED_RESCHED_LAZY | \
+ 				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
+ 				 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
+ 				 _TIF_NOTIFY_SIGNAL)
+ #define _TIF_PERSYSCALL_MASK	(_TIF_RESTOREALL|_TIF_NOERROR)
++#define _TIF_NEED_RESCHED_MASK	(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
+ 
+ /* Bits in local_flags */
+ /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
+diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
+index cf770d86c03c..2c454731c250 100644
+--- a/arch/powerpc/kernel/interrupt.c
++++ b/arch/powerpc/kernel/interrupt.c
+@@ -186,7 +186,7 @@ interrupt_exit_user_prepare_main(unsigned long ret, struct pt_regs *regs)
+ 	ti_flags = read_thread_flags();
+ 	while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
+ 		local_irq_enable();
+-		if (ti_flags & _TIF_NEED_RESCHED) {
++		if (ti_flags & _TIF_NEED_RESCHED_MASK) {
+ 			schedule();
+ 		} else {
+ 			/*
+@@ -397,11 +397,15 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
+ 		/* Returning to a kernel context with local irqs enabled. */
+ 		WARN_ON_ONCE(!(regs->msr & MSR_EE));
+ again:
+-		if (IS_ENABLED(CONFIG_PREEMPT)) {
++		if (IS_ENABLED(CONFIG_PREEMPTION)) {
+ 			/* Return to preemptible kernel context */
+ 			if (unlikely(read_thread_flags() & _TIF_NEED_RESCHED)) {
+ 				if (preempt_count() == 0)
+ 					preempt_schedule_irq();
++			} else if (unlikely(current_thread_info()->flags & _TIF_NEED_RESCHED_LAZY)) {
++				if ((preempt_count() == 0) &&
++				    (current_thread_info()->preempt_lazy_count == 0))
++					preempt_schedule_irq();
+ 			}
+ 		}
+ 
+-- 
+2.43.0
+
-- 
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