Adding debian version 6.1.76-1.debian/6.1.76-1

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

1 files changed, 137 insertions, 0 deletions

diff --git a/debian/patches-rt/0036-arm-Add-support-for-lazy-preemption.patch b/debian/patches-rt/0036-arm-Add-support-for-lazy-preemption.patch
new file mode 100644
index 000000000..8f76d13b0
--- /dev/null
+++ b/debian/patches-rt/0036-arm-Add-support-for-lazy-preemption.patch
@@ -0,0 +1,137 @@
+From f242fbbb3f85d6b9c8c8fc06ddbc83b9ca5a0511 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Wed, 31 Oct 2012 12:04:11 +0100
+Subject: [PATCH 36/62] arm: 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 arm pieces for lazy preempt.
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ arch/arm/Kconfig                   |  1 +
+ arch/arm/include/asm/thread_info.h |  6 +++++-
+ arch/arm/kernel/asm-offsets.c      |  1 +
+ arch/arm/kernel/entry-armv.S       | 19 ++++++++++++++++---
+ arch/arm/kernel/signal.c           |  3 ++-
+ 5 files changed, 25 insertions(+), 5 deletions(-)
+
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index 6d5afe2e6ba3..717e596dc13b 100644
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -115,6 +115,7 @@ config ARM
+ 	select HAVE_PERF_EVENTS
+ 	select HAVE_PERF_REGS
+ 	select HAVE_PERF_USER_STACK_DUMP
++	select HAVE_PREEMPT_LAZY
+ 	select MMU_GATHER_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 7f092cb55a41..ffcbf8ebed4b 100644
+--- a/arch/arm/include/asm/thread_info.h
++++ b/arch/arm/include/asm/thread_info.h
+@@ -62,6 +62,7 @@ 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 */
+ 	__u32			cpu;		/* cpu */
+ 	__u32			cpu_domain;	/* cpu domain */
+ 	struct cpu_context_save	cpu_context;	/* cpu context */
+@@ -129,6 +130,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
+ #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
+ #define TIF_UPROBE		3	/* breakpointed or singlestepping */
+ #define TIF_NOTIFY_SIGNAL	4	/* signal notifications exist */
++#define TIF_NEED_RESCHED_LAZY	5
+ 
+ #define TIF_USING_IWMMXT	17
+ #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
+@@ -148,6 +150,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
+ #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
+ #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+ #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
++#define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
+ #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
+ 
+ /* Checks for any syscall work in entry-common.S */
+@@ -157,7 +160,8 @@ 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 | \
++#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY | \
++				 _TIF_SIGPENDING | \
+ 				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
+ 				 _TIF_NOTIFY_SIGNAL)
+ 
+diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
+index 2c8d76fd7c66..c3bdec7d2df9 100644
+--- a/arch/arm/kernel/asm-offsets.c
++++ b/arch/arm/kernel/asm-offsets.c
+@@ -43,6 +43,7 @@ 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_CPU,		offsetof(struct thread_info, cpu));
+   DEFINE(TI_CPU_DOMAIN,		offsetof(struct thread_info, cpu_domain));
+   DEFINE(TI_CPU_SAVE,		offsetof(struct thread_info, cpu_context));
+diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
+index c39303e5c234..cfb4660e9fea 100644
+--- a/arch/arm/kernel/entry-armv.S
++++ b/arch/arm/kernel/entry-armv.S
+@@ -222,11 +222,18 @@ ENDPROC(__dabt_svc)
+ 
+ #ifdef CONFIG_PREEMPTION
+ 	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
+@@ -241,8 +248,14 @@ 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/signal.c b/arch/arm/kernel/signal.c
+index e07f359254c3..b50a3248e79f 100644
+--- a/arch/arm/kernel/signal.c
++++ b/arch/arm/kernel/signal.c
+@@ -607,7 +607,8 @@ 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)))
+-- 
+2.43.0
+