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-rw-r--r--target/linux/generic/patches-4.9/040-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch116
1 files changed, 0 insertions, 116 deletions
diff --git a/target/linux/generic/patches-4.9/040-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch b/target/linux/generic/patches-4.9/040-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch
deleted file mode 100644
index 0c7e45be96..0000000000
--- a/target/linux/generic/patches-4.9/040-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch
+++ /dev/null
@@ -1,116 +0,0 @@
-From: Matt Redfearn <matt.redfearn@imgtec.com>
-Date: Mon, 19 Dec 2016 14:20:59 +0000
-Subject: [PATCH] MIPS: Switch to the irq_stack in interrupts
-
-When enterring interrupt context via handle_int or except_vec_vi, switch
-to the irq_stack of the current CPU if it is not already in use.
-
-The current stack pointer is masked with the thread size and compared to
-the base or the irq stack. If it does not match then the stack pointer
-is set to the top of that stack, otherwise this is a nested irq being
-handled on the irq stack so the stack pointer should be left as it was.
-
-The in-use stack pointer is placed in the callee saved register s1. It
-will be saved to the stack when plat_irq_dispatch is invoked and can be
-restored once control returns here.
-
-Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
----
-
---- a/arch/mips/kernel/genex.S
-+++ b/arch/mips/kernel/genex.S
-@@ -187,9 +187,44 @@ NESTED(handle_int, PT_SIZE, sp)
-
- LONG_L s0, TI_REGS($28)
- LONG_S sp, TI_REGS($28)
-- PTR_LA ra, ret_from_irq
-- PTR_LA v0, plat_irq_dispatch
-- jr v0
-+
-+ /*
-+ * SAVE_ALL ensures we are using a valid kernel stack for the thread.
-+ * Check if we are already using the IRQ stack.
-+ */
-+ move s1, sp # Preserve the sp
-+
-+ /* Get IRQ stack for this CPU */
-+ ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG
-+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
-+ lui k1, %hi(irq_stack)
-+#else
-+ lui k1, %highest(irq_stack)
-+ daddiu k1, %higher(irq_stack)
-+ dsll k1, 16
-+ daddiu k1, %hi(irq_stack)
-+ dsll k1, 16
-+#endif
-+ LONG_SRL k0, SMP_CPUID_PTRSHIFT
-+ LONG_ADDU k1, k0
-+ LONG_L t0, %lo(irq_stack)(k1)
-+
-+ # Check if already on IRQ stack
-+ PTR_LI t1, ~(_THREAD_SIZE-1)
-+ and t1, t1, sp
-+ beq t0, t1, 2f
-+
-+ /* Switch to IRQ stack */
-+ li t1, _IRQ_STACK_SIZE
-+ PTR_ADD sp, t0, t1
-+
-+2:
-+ jal plat_irq_dispatch
-+
-+ /* Restore sp */
-+ move sp, s1
-+
-+ j ret_from_irq
- #ifdef CONFIG_CPU_MICROMIPS
- nop
- #endif
-@@ -262,8 +297,44 @@ NESTED(except_vec_vi_handler, 0, sp)
-
- LONG_L s0, TI_REGS($28)
- LONG_S sp, TI_REGS($28)
-- PTR_LA ra, ret_from_irq
-- jr v0
-+
-+ /*
-+ * SAVE_ALL ensures we are using a valid kernel stack for the thread.
-+ * Check if we are already using the IRQ stack.
-+ */
-+ move s1, sp # Preserve the sp
-+
-+ /* Get IRQ stack for this CPU */
-+ ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG
-+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
-+ lui k1, %hi(irq_stack)
-+#else
-+ lui k1, %highest(irq_stack)
-+ daddiu k1, %higher(irq_stack)
-+ dsll k1, 16
-+ daddiu k1, %hi(irq_stack)
-+ dsll k1, 16
-+#endif
-+ LONG_SRL k0, SMP_CPUID_PTRSHIFT
-+ LONG_ADDU k1, k0
-+ LONG_L t0, %lo(irq_stack)(k1)
-+
-+ # Check if already on IRQ stack
-+ PTR_LI t1, ~(_THREAD_SIZE-1)
-+ and t1, t1, sp
-+ beq t0, t1, 2f
-+
-+ /* Switch to IRQ stack */
-+ li t1, _IRQ_STACK_SIZE
-+ PTR_ADD sp, t0, t1
-+
-+2:
-+ jal plat_irq_dispatch
-+
-+ /* Restore sp */
-+ move sp, s1
-+
-+ j ret_from_irq
- END(except_vec_vi_handler)
-
- /*