[PATCH 0/2] riscv: kexec: Support crash_save percpu and machine_kexec_mask_interrupts

[PATCH 0/2] riscv: kexec: Support crash_save percpu and machine_kexec_mask_interrupts

[guoren]

From: Guo Ren <guoren@linux.alibaba.com>

Current riscv kexec can't crash_save percpu states and disable
interrupts properly. The patch series fix them.

Guo Ren (2):
  riscv: kexec: EOI active and mask all interrupts in kexec crash path
  riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu

 arch/riscv/include/asm/smp.h      |  6 +++
 arch/riscv/kernel/machine_kexec.c | 44 +++++++++++----
 arch/riscv/kernel/smp.c           | 89 ++++++++++++++++++++++++++++++-
 3 files changed, 126 insertions(+), 13 deletions(-)

-- 
2.36.1


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[PATCH 1/2] riscv: kexec: EOI active and mask all interrupts in kexec crash path

[guoren]

From: Guo Ren <guoren@linux.alibaba.com>

If a crash happens on cpu3 and all interrupts are binding on cpu0, the
bad irq routing will cause a crash kernel that can't receive any irq.
Because start-up of crash kernel won't clean up other hart plic to
enable the context. The patch is similar to 9141a003a491 ("ARM: 7316/1:
kexec: EOI active and mask all interrupts in kexec crash path") and
78fd584cdec0 ("arm64: kdump: implement machine_crash_shutdown()"), also
PowerPC has the same mechanism.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
 arch/riscv/kernel/machine_kexec.c | 35 +++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index ee79e6839b86..db41c676e5a2 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -15,6 +15,8 @@
 #include <linux/compiler.h>	/* For unreachable() */
 #include <linux/cpu.h>		/* For cpu_down() */
 #include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
 
 /*
  * kexec_image_info - Print received image details
@@ -154,6 +156,37 @@ void crash_smp_send_stop(void)
 	cpus_stopped = 1;
 }
 
+static void machine_kexec_mask_interrupts(void)
+{
+	unsigned int i;
+	struct irq_desc *desc;
+
+	for_each_irq_desc(i, desc) {
+		struct irq_chip *chip;
+		int ret;
+
+		chip = irq_desc_get_chip(desc);
+		if (!chip)
+			continue;
+
+		/*
+		 * First try to remove the active state. If this
+		 * fails, try to EOI the interrupt.
+		 */
+		ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
+
+		if (ret && irqd_irq_inprogress(&desc->irq_data) &&
+		    chip->irq_eoi)
+			chip->irq_eoi(&desc->irq_data);
+
+		if (chip->irq_mask)
+			chip->irq_mask(&desc->irq_data);
+
+		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
+			chip->irq_disable(&desc->irq_data);
+	}
+}
+
 /*
  * machine_crash_shutdown - Prepare to kexec after a kernel crash
  *
@@ -169,6 +202,8 @@ machine_crash_shutdown(struct pt_regs *regs)
 	crash_smp_send_stop();
 
 	crash_save_cpu(regs, smp_processor_id());
+	machine_kexec_mask_interrupts();
+
 	pr_info("Starting crashdump kernel...\n");
 }
 
-- 
2.36.1


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[PATCH 2/2] riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu

[guoren]

From: Guo Ren <guoren@linux.alibaba.com>

Current crash_smp_send_stop is the same as the generic one in
kernel/panic. without crash_save_cpu in percpu. This patch is inspired
by 78fd584cdec0 ("arm64: kdump: implement machine_crash_shutdown()")
and adds the same mechanism for riscv.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
 arch/riscv/include/asm/smp.h      |  6 +++
 arch/riscv/kernel/machine_kexec.c | 19 ++-----
 arch/riscv/kernel/smp.c           | 89 ++++++++++++++++++++++++++++++-
 3 files changed, 96 insertions(+), 18 deletions(-)

diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index d3443be7eedc..e0ddbfcf7c43 100644
--- a/arch/riscv/include/asm/smp.h
+++ b/arch/riscv/include/asm/smp.h
@@ -50,6 +50,12 @@ void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops);
 /* Clear IPI for current CPU */
 void riscv_clear_ipi(void);
 
+/* stop and save status for other CPUs */
+void crash_smp_send_stop(void);
+
+/* Check other CPUs stop or not */
+extern bool smp_crash_stop_failed(void);
+
 /* Secondary hart entry */
 asmlinkage void smp_callin(void);
 
diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index db41c676e5a2..34c86d337448 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -140,22 +140,6 @@ void machine_shutdown(void)
 #endif
 }
 
-/* Override the weak function in kernel/panic.c */
-void crash_smp_send_stop(void)
-{
-	static int cpus_stopped;
-
-	/*
-	 * This function can be called twice in panic path, but obviously
-	 * we execute this only once.
-	 */
-	if (cpus_stopped)
-		return;
-
-	smp_send_stop();
-	cpus_stopped = 1;
-}
-
 static void machine_kexec_mask_interrupts(void)
 {
 	unsigned int i;
@@ -230,6 +214,9 @@ machine_kexec(struct kimage *image)
 	void *control_code_buffer = page_address(image->control_code_page);
 	riscv_kexec_method kexec_method = NULL;
 
+	WARN(smp_crash_stop_failed(),
+		"Some CPUs may be stale, kdump will be unreliable.\n");
+
 	if (image->type != KEXEC_TYPE_CRASH)
 		kexec_method = control_code_buffer;
 	else
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index 760a64518c58..a75ad9c373cd 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -12,6 +12,7 @@
 #include <linux/clockchips.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/kexec.h>
 #include <linux/profile.h>
 #include <linux/smp.h>
 #include <linux/sched.h>
@@ -27,6 +28,7 @@ enum ipi_message_type {
 	IPI_RESCHEDULE,
 	IPI_CALL_FUNC,
 	IPI_CPU_STOP,
+	IPI_CPU_CRASH_STOP,
 	IPI_IRQ_WORK,
 	IPI_TIMER,
 	IPI_MAX
@@ -71,6 +73,22 @@ static void ipi_stop(void)
 		wait_for_interrupt();
 }
 
+#ifdef CONFIG_KEXEC_CORE
+static atomic_t waiting_for_crash_ipi = ATOMIC_INIT(0);
+
+static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
+{
+	crash_save_cpu(regs, cpu);
+
+	atomic_dec(&waiting_for_crash_ipi);
+
+	local_irq_disable();
+
+	while(1)
+		wait_for_interrupt();
+}
+#endif
+
 static const struct riscv_ipi_ops *ipi_ops __ro_after_init;
 
 void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
@@ -124,8 +142,9 @@ void arch_irq_work_raise(void)
 
 void handle_IPI(struct pt_regs *regs)
 {
-	unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
-	unsigned long *stats = ipi_data[smp_processor_id()].stats;
+	unsigned int cpu = smp_processor_id();
+	unsigned long *pending_ipis = &ipi_data[cpu].bits;
+	unsigned long *stats = ipi_data[cpu].stats;
 
 	riscv_clear_ipi();
 
@@ -154,6 +173,13 @@ void handle_IPI(struct pt_regs *regs)
 			ipi_stop();
 		}
 
+		if (ops & (1 << IPI_CPU_CRASH_STOP)) {
+#ifdef CONFIG_KEXEC_CORE
+			ipi_cpu_crash_stop(cpu, get_irq_regs());
+#endif
+			unreachable();
+		}
+
 		if (ops & (1 << IPI_IRQ_WORK)) {
 			stats[IPI_IRQ_WORK]++;
 			irq_work_run();
@@ -176,6 +202,7 @@ static const char * const ipi_names[] = {
 	[IPI_RESCHEDULE]	= "Rescheduling interrupts",
 	[IPI_CALL_FUNC]		= "Function call interrupts",
 	[IPI_CPU_STOP]		= "CPU stop interrupts",
+	[IPI_CPU_CRASH_STOP]	= "CPU stop (for crash dump) interrupts",
 	[IPI_IRQ_WORK]		= "IRQ work interrupts",
 	[IPI_TIMER]		= "Timer broadcast interrupts",
 };
@@ -235,6 +262,64 @@ void smp_send_stop(void)
 			   cpumask_pr_args(cpu_online_mask));
 }
 
+#ifdef CONFIG_KEXEC_CORE
+/*
+ * The number of CPUs online, not counting this CPU (which may not be
+ * fully online and so not counted in num_online_cpus()).
+ */
+static inline unsigned int num_other_online_cpus(void)
+{
+	unsigned int this_cpu_online = cpu_online(smp_processor_id());
+
+	return num_online_cpus() - this_cpu_online;
+}
+
+void crash_smp_send_stop(void)
+{
+	static int cpus_stopped;
+	cpumask_t mask;
+	unsigned long timeout;
+
+	/*
+	 * This function can be called twice in panic path, but obviously
+	 * we execute this only once.
+	 */
+	if (cpus_stopped)
+		return;
+
+	cpus_stopped = 1;
+
+	/*
+	 * If this cpu is the only one alive at this point in time, online or
+	 * not, there are no stop messages to be sent around, so just back out.
+	 */
+	if (num_other_online_cpus() == 0)
+		return;
+
+	cpumask_copy(&mask, cpu_online_mask);
+	cpumask_clear_cpu(smp_processor_id(), &mask);
+
+	atomic_set(&waiting_for_crash_ipi, num_other_online_cpus());
+
+	pr_crit("SMP: stopping secondary CPUs\n");
+	send_ipi_mask(&mask, IPI_CPU_CRASH_STOP);
+
+	/* Wait up to one second for other CPUs to stop */
+	timeout = USEC_PER_SEC;
+	while ((atomic_read(&waiting_for_crash_ipi) > 0) && timeout--)
+		udelay(1);
+
+	if (atomic_read(&waiting_for_crash_ipi) > 0)
+		pr_warn("SMP: failed to stop secondary CPUs %*pbl\n",
+			cpumask_pr_args(&mask));
+}
+
+bool smp_crash_stop_failed(void)
+{
+	return (atomic_read(&waiting_for_crash_ipi) > 0);
+}
+#endif
+
 void smp_send_reschedule(int cpu)
 {
 	send_ipi_single(cpu, IPI_RESCHEDULE);
-- 
2.36.1


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Re: [PATCH 2/2] riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu

[kernel test robot]

Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.0-rc1 next-20220818]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
config: riscv-randconfig-r035-20220818 (https://download.01.org/0day-ci/archive/20220818/202208181520.fYQOePu6-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project aed5e3bea138ce581d682158eb61c27b3cfdd6ec)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/0abdaf7e1f44634e1cee484e3cf01b7e8c851950
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
        git checkout 0abdaf7e1f44634e1cee484e3cf01b7e8c851950
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> arch/riscv/kernel/machine_kexec.c:217:7: error: call to undeclared function 'smp_crash_stop_failed'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           WARN(smp_crash_stop_failed(),
                ^
   1 error generated.


vim +/smp_crash_stop_failed +217 arch/riscv/kernel/machine_kexec.c

   193	
   194	/*
   195	 * machine_kexec - Jump to the loaded kimage
   196	 *
   197	 * This function is called by kernel_kexec which is called by the
   198	 * reboot system call when the reboot cmd is LINUX_REBOOT_CMD_KEXEC,
   199	 * or by crash_kernel which is called by the kernel's arch-specific
   200	 * trap handler in case of a kernel panic. It's the final stage of
   201	 * the kexec process where the pre-loaded kimage is ready to be
   202	 * executed. We assume at this point that all other harts are
   203	 * suspended and this hart will be the new boot hart.
   204	 */
   205	void __noreturn
   206	machine_kexec(struct kimage *image)
   207	{
   208		struct kimage_arch *internal = &image->arch;
   209		unsigned long jump_addr = (unsigned long) image->start;
   210		unsigned long first_ind_entry = (unsigned long) &image->head;
   211		unsigned long this_cpu_id = __smp_processor_id();
   212		unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id);
   213		unsigned long fdt_addr = internal->fdt_addr;
   214		void *control_code_buffer = page_address(image->control_code_page);
   215		riscv_kexec_method kexec_method = NULL;
   216	
 > 217		WARN(smp_crash_stop_failed(),

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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Re: [PATCH 2/2] riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu

[Guo Ren]

Thx, It's a bug from !SMP. I would fixup it in the next version.

On Thu, Aug 18, 2022 at 3:58 PM kernel test robot <lkp@intel.com> wrote:
>
> Hi,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v6.0-rc1 next-20220818]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
> config: riscv-randconfig-r035-20220818 (https://download.01.org/0day-ci/archive/20220818/202208181520.fYQOePu6-lkp@intel.com/config)
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project aed5e3bea138ce581d682158eb61c27b3cfdd6ec)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install riscv cross compiling tool for clang build
>         # apt-get install binutils-riscv64-linux-gnu
>         # https://github.com/intel-lab-lkp/linux/commit/0abdaf7e1f44634e1cee484e3cf01b7e8c851950
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
>         git checkout 0abdaf7e1f44634e1cee484e3cf01b7e8c851950
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
> >> arch/riscv/kernel/machine_kexec.c:217:7: error: call to undeclared function 'smp_crash_stop_failed'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>            WARN(smp_crash_stop_failed(),
>                 ^
>    1 error generated.
>
>
> vim +/smp_crash_stop_failed +217 arch/riscv/kernel/machine_kexec.c
>
>    193
>    194  /*
>    195   * machine_kexec - Jump to the loaded kimage
>    196   *
>    197   * This function is called by kernel_kexec which is called by the
>    198   * reboot system call when the reboot cmd is LINUX_REBOOT_CMD_KEXEC,
>    199   * or by crash_kernel which is called by the kernel's arch-specific
>    200   * trap handler in case of a kernel panic. It's the final stage of
>    201   * the kexec process where the pre-loaded kimage is ready to be
>    202   * executed. We assume at this point that all other harts are
>    203   * suspended and this hart will be the new boot hart.
>    204   */
>    205  void __noreturn
>    206  machine_kexec(struct kimage *image)
>    207  {
>    208          struct kimage_arch *internal = &image->arch;
>    209          unsigned long jump_addr = (unsigned long) image->start;
>    210          unsigned long first_ind_entry = (unsigned long) &image->head;
>    211          unsigned long this_cpu_id = __smp_processor_id();
>    212          unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id);
>    213          unsigned long fdt_addr = internal->fdt_addr;
>    214          void *control_code_buffer = page_address(image->control_code_page);
>    215          riscv_kexec_method kexec_method = NULL;
>    216
>  > 217          WARN(smp_crash_stop_failed(),
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp



-- 
Best Regards
 Guo Ren

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Re: [PATCH 2/2] riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu

[kernel test robot]

Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.0-rc1 next-20220818]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
config: riscv-buildonly-randconfig-r002-20220818 (https://download.01.org/0day-ci/archive/20220818/202208181655.NrkPo4lG-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/0abdaf7e1f44634e1cee484e3cf01b7e8c851950
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review guoren-kernel-org/riscv-kexec-Support-crash_save-percpu-and-machine_kexec_mask_interrupts/20220816-144442
        git checkout 0abdaf7e1f44634e1cee484e3cf01b7e8c851950
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/riscv/include/asm/bug.h:83,
                    from include/linux/bug.h:5,
                    from include/linux/elfcore.h:6,
                    from include/linux/crash_core.h:6,
                    from include/linux/kexec.h:18,
                    from arch/riscv/kernel/machine_kexec.c:7:
   arch/riscv/kernel/machine_kexec.c: In function 'machine_kexec':
>> arch/riscv/kernel/machine_kexec.c:217:14: error: implicit declaration of function 'smp_crash_stop_failed' [-Werror=implicit-function-declaration]
     217 |         WARN(smp_crash_stop_failed(),
         |              ^~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/bug.h:174:32: note: in definition of macro 'WARN'
     174 |         int __ret_warn_on = !!(condition);                              \
         |                                ^~~~~~~~~
   cc1: some warnings being treated as errors


vim +/smp_crash_stop_failed +217 arch/riscv/kernel/machine_kexec.c

   193	
   194	/*
   195	 * machine_kexec - Jump to the loaded kimage
   196	 *
   197	 * This function is called by kernel_kexec which is called by the
   198	 * reboot system call when the reboot cmd is LINUX_REBOOT_CMD_KEXEC,
   199	 * or by crash_kernel which is called by the kernel's arch-specific
   200	 * trap handler in case of a kernel panic. It's the final stage of
   201	 * the kexec process where the pre-loaded kimage is ready to be
   202	 * executed. We assume at this point that all other harts are
   203	 * suspended and this hart will be the new boot hart.
   204	 */
   205	void __noreturn
   206	machine_kexec(struct kimage *image)
   207	{
   208		struct kimage_arch *internal = &image->arch;
   209		unsigned long jump_addr = (unsigned long) image->start;
   210		unsigned long first_ind_entry = (unsigned long) &image->head;
   211		unsigned long this_cpu_id = __smp_processor_id();
   212		unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id);
   213		unsigned long fdt_addr = internal->fdt_addr;
   214		void *control_code_buffer = page_address(image->control_code_page);
   215		riscv_kexec_method kexec_method = NULL;
   216	
 > 217		WARN(smp_crash_stop_failed(),

-- 
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https://01.org/lkp

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Re: [PATCH 0/2] riscv: kexec: Support crash_save percpu and machine_kexec_mask_interrupts

[Conor.Dooley]

On 16/08/2022 02:26, guoren@kernel.org wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> From: Guo Ren <guoren@linux.alibaba.com>
> 
> Current riscv kexec can't crash_save percpu states and disable
> interrupts properly. The patch series fix them.

Hey,
If these are fixes, are there fixes tags you could add?
I don't see one for either patch.
Thanks,
Conor.

> 
> Guo Ren (2):
>    riscv: kexec: EOI active and mask all interrupts in kexec crash path
>    riscv: kexec: Implement crash_smp_send_stop with percpu crash_save_cpu
> 
>   arch/riscv/include/asm/smp.h      |  6 +++
>   arch/riscv/kernel/machine_kexec.c | 44 +++++++++++----
>   arch/riscv/kernel/smp.c           | 89 ++++++++++++++++++++++++++++++-
>   3 files changed, 126 insertions(+), 13 deletions(-)
> 
> --
> 2.36.1
> 
> 
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