FAILED: patch "[PATCH] riscv: Ensure the value of FP registers in the core dump file" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 379eb01c21795edb4ca8d342503bd2183a19ec3a Mon Sep 17 00:00:00 2001
From: Vincent Chen <[email protected]>
Date: Tue, 3 Aug 2021 17:27:51 +0800
Subject: [PATCH] riscv: Ensure the value of FP registers in the core dump file
is up to date

The value of FP registers in the core dump file comes from the thread.fstate. However, kernel saves the FP registers to the thread.fstate only before scheduling out the process. If no process switch happens during the exception handling process, kernel will not have a chance to save the latest value of FP registers to thread.fstate. It will cause the value of FP registers in the core dump file may be incorrect. To solve this problem, this patch force lets kernel save the FP register into the thread.fstate if the target task_struct equals the current.

index 1a85305720e8..9c0511119bad 100644
@@ -10,6 +10,7 @@
 #include <asm/ptrace.h>
 #include <asm/syscall.h>
 #include <asm/thread_info.h>
+#include <asm/switch_to.h>
 #include <linux/audit.h>
 #include <linux/ptrace.h>
 #include <linux/elf.h>

@@ -56,6 +57,9 @@ static int riscv_fpr_get(struct task_struct *target,
 {
 	struct __riscv_d_ext_state *fstate = &target->thread.fstate;
 
+	if (target == current)
+		fstate_save(current, task_pt_regs(current));
+
 	membuf_write(&to, fstate, offsetof(struct __riscv_d_ext_state, fcsr));
 	membuf_store(&to, fstate->fcsr);
 	return membuf_zero(&to, 4);	// explicitly pad