Adding debian version 4.19.249-2.debian/4.19.249-2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 168 insertions, 0 deletions

diff --git a/debian/patches-rt/0242-arm-Add-support-for-lazy-preemption.patch b/debian/patches-rt/0242-arm-Add-support-for-lazy-preemption.patch
new file mode 100644
index 000000000..af7fd9bc3
--- /dev/null
+++ b/debian/patches-rt/0242-arm-Add-support-for-lazy-preemption.patch
@@ -0,0 +1,168 @@
+From 3845cb2e5f05561da9e363932c9373f45b5fa6a4 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Wed, 31 Oct 2012 12:04:11 +0100
+Subject: [PATCH 242/347] arm: Add support for lazy preemption
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+Implement the arm pieces for lazy preempt.
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ arch/arm/Kconfig                   |  1 +
+ arch/arm/include/asm/thread_info.h |  8 ++++++--
+ arch/arm/kernel/asm-offsets.c      |  1 +
+ arch/arm/kernel/entry-armv.S       | 19 ++++++++++++++++---
+ arch/arm/kernel/entry-common.S     |  9 +++++++--
+ arch/arm/kernel/signal.c           |  3 ++-
+ 6 files changed, 33 insertions(+), 8 deletions(-)
+
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index ec99422059e3..2607cae04885 100644
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -91,6 +91,7 @@ config ARM
+ 	select HAVE_PERF_EVENTS
+ 	select HAVE_PERF_REGS
+ 	select HAVE_PERF_USER_STACK_DUMP
++	select HAVE_PREEMPT_LAZY
+ 	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
+ 	select HAVE_REGS_AND_STACK_ACCESS_API
+ 	select HAVE_RSEQ
+diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
+index 8f55dc520a3e..4f834bfca470 100644
+--- a/arch/arm/include/asm/thread_info.h
++++ b/arch/arm/include/asm/thread_info.h
+@@ -49,6 +49,7 @@ struct cpu_context_save {
+ struct thread_info {
+ 	unsigned long		flags;		/* low level flags */
+ 	int			preempt_count;	/* 0 => preemptable, <0 => bug */
++	int			preempt_lazy_count; /* 0 => preemptable, <0 => bug */
+ 	mm_segment_t		addr_limit;	/* address limit */
+ 	struct task_struct	*task;		/* main task structure */
+ 	__u32			cpu;		/* cpu */
+@@ -139,7 +140,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
+ #define TIF_SYSCALL_TRACE	4	/* syscall trace active */
+ #define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
+ #define TIF_SYSCALL_TRACEPOINT	6	/* syscall tracepoint instrumentation */
+-#define TIF_SECCOMP		7	/* seccomp syscall filtering active */
++#define TIF_SECCOMP		8	/* seccomp syscall filtering active */
++#define TIF_NEED_RESCHED_LAZY	7
+ 
+ #define TIF_NOHZ		12	/* in adaptive nohz mode */
+ #define TIF_USING_IWMMXT	17
+@@ -149,6 +151,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
+ #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+ #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+ #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
++#define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
+ #define _TIF_UPROBE		(1 << TIF_UPROBE)
+ #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+ #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+@@ -164,7 +167,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
+  * Change these and you break ASM code in entry-common.S
+  */
+ #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
+-				 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
++				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
++				 _TIF_NEED_RESCHED_LAZY)
+ 
+ #endif /* __KERNEL__ */
+ #endif /* __ASM_ARM_THREAD_INFO_H */
+diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
+index 40afe953a0e2..d634d6f36140 100644
+--- a/arch/arm/kernel/asm-offsets.c
++++ b/arch/arm/kernel/asm-offsets.c
+@@ -58,6 +58,7 @@ int main(void)
+   BLANK();
+   DEFINE(TI_FLAGS,		offsetof(struct thread_info, flags));
+   DEFINE(TI_PREEMPT,		offsetof(struct thread_info, preempt_count));
++  DEFINE(TI_PREEMPT_LAZY,	offsetof(struct thread_info, preempt_lazy_count));
+   DEFINE(TI_ADDR_LIMIT,		offsetof(struct thread_info, addr_limit));
+   DEFINE(TI_TASK,		offsetof(struct thread_info, task));
+   DEFINE(TI_CPU,		offsetof(struct thread_info, cpu));
+diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
+index d779cd1a3b0c..dc7ae3d8e62f 100644
+--- a/arch/arm/kernel/entry-armv.S
++++ b/arch/arm/kernel/entry-armv.S
+@@ -209,11 +209,18 @@ ENDPROC(__dabt_svc)
+ 
+ #ifdef CONFIG_PREEMPT
+ 	ldr	r8, [tsk, #TI_PREEMPT]		@ get preempt count
+-	ldr	r0, [tsk, #TI_FLAGS]		@ get flags
+ 	teq	r8, #0				@ if preempt count != 0
++	bne	1f				@ return from exeption
++	ldr	r0, [tsk, #TI_FLAGS]		@ get flags
++	tst	r0, #_TIF_NEED_RESCHED		@ if NEED_RESCHED is set
++	blne	svc_preempt			@ preempt!
++
++	ldr	r8, [tsk, #TI_PREEMPT_LAZY]	@ get preempt lazy count
++	teq	r8, #0				@ if preempt lazy count != 0
+ 	movne	r0, #0				@ force flags to 0
+-	tst	r0, #_TIF_NEED_RESCHED
++	tst	r0, #_TIF_NEED_RESCHED_LAZY
+ 	blne	svc_preempt
++1:
+ #endif
+ 
+ 	svc_exit r5, irq = 1			@ return from exception
+@@ -228,8 +235,14 @@ ENDPROC(__irq_svc)
+ 1:	bl	preempt_schedule_irq		@ irq en/disable is done inside
+ 	ldr	r0, [tsk, #TI_FLAGS]		@ get new tasks TI_FLAGS
+ 	tst	r0, #_TIF_NEED_RESCHED
++	bne	1b
++	tst	r0, #_TIF_NEED_RESCHED_LAZY
+ 	reteq	r8				@ go again
+-	b	1b
++	ldr	r0, [tsk, #TI_PREEMPT_LAZY]	@ get preempt lazy count
++	teq	r0, #0				@ if preempt lazy count != 0
++	beq	1b
++	ret	r8				@ go again
++
+ #endif
+ 
+ __und_fault:
+diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
+index e27fc2df5231..bc326519f648 100644
+--- a/arch/arm/kernel/entry-common.S
++++ b/arch/arm/kernel/entry-common.S
+@@ -56,7 +56,9 @@ saved_pc	.req	lr
+ 	cmp	r2, #TASK_SIZE
+ 	blne	addr_limit_check_failed
+ 	ldr	r1, [tsk, #TI_FLAGS]		@ re-check for syscall tracing
+-	tst	r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
++	tst	r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP)
++	bne	fast_work_pending
++	tst	r1, #_TIF_SECCOMP
+ 	bne	fast_work_pending
+ 
+ 
+@@ -93,8 +95,11 @@ ENDPROC(ret_fast_syscall)
+ 	cmp	r2, #TASK_SIZE
+ 	blne	addr_limit_check_failed
+ 	ldr	r1, [tsk, #TI_FLAGS]		@ re-check for syscall tracing
+-	tst	r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
++	tst	r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP)
++	bne	do_slower_path
++	tst	r1, #_TIF_SECCOMP
+ 	beq	no_work_pending
++do_slower_path:
+  UNWIND(.fnend		)
+ ENDPROC(ret_fast_syscall)
+ 
+diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
+index 1c01358b9b6d..263b0321dc50 100644
+--- a/arch/arm/kernel/signal.c
++++ b/arch/arm/kernel/signal.c
+@@ -652,7 +652,8 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
+ 	 */
+ 	trace_hardirqs_off();
+ 	do {
+-		if (likely(thread_flags & _TIF_NEED_RESCHED)) {
++		if (likely(thread_flags & (_TIF_NEED_RESCHED |
++					   _TIF_NEED_RESCHED_LAZY))) {
+ 			schedule();
+ 		} else {
+ 			if (unlikely(!user_mode(regs)))
+-- 
+2.36.1
+