Merge tag 'loongarch-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch updates from Huacai Chen:

 - Allow usage of LSX/LASX in the kernel, and use them for
   SIMD-optimized RAID5/RAID6 routines

 - Add Loongson Binary Translation (LBT) extension support

 - Add basic KGDB & KDB support

 - Add building with kcov coverage

 - Add KFENCE (Kernel Electric-Fence) support

 - Add KASAN (Kernel Address Sanitizer) support

 - Some bug fixes and other small changes

 - Update the default config file

* tag 'loongarch-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: (25 commits)
  LoongArch: Update Loongson-3 default config file
  LoongArch: Add KASAN (Kernel Address Sanitizer) support
  LoongArch: Simplify the processing of jumping new kernel for KASLR
  kasan: Add (pmd|pud)_init for LoongArch zero_(pud|p4d)_populate process
  kasan: Add __HAVE_ARCH_SHADOW_MAP to support arch specific mapping
  LoongArch: Add KFENCE (Kernel Electric-Fence) support
  LoongArch: Get partial stack information when providing regs parameter
  LoongArch: mm: Add page table mapped mode support for virt_to_page()
  kfence: Defer the assignment of the local variable addr
  LoongArch: Allow building with kcov coverage
  LoongArch: Provide kaslr_offset() to get kernel offset
  LoongArch: Add basic KGDB & KDB support
  LoongArch: Add Loongson Binary Translation (LBT) extension support
  raid6: Add LoongArch SIMD recovery implementation
  raid6: Add LoongArch SIMD syndrome calculation
  LoongArch: Add SIMD-optimized XOR routines
  LoongArch: Allow usage of LSX/LASX in the kernel
  LoongArch: Define symbol 'fault' as a local label in fpu.S
  LoongArch: Adjust {copy, clear}_user exception handler behavior
  LoongArch: Use static defined zero page rather than allocated
  ...

1 files changed, 12 insertions, 3 deletions

diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c
index ba457e43f5be..3cb082e0c992 100644
--- a/arch/loongarch/kernel/process.c
+++ b/arch/loongarch/kernel/process.c
@@ -38,6 +38,7 @@
 #include <asm/cpu.h>
 #include <asm/elf.h>
 #include <asm/fpu.h>
+#include <asm/lbt.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/irq_regs.h>
@@ -82,9 +83,11 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
 	euen = regs->csr_euen & ~(CSR_EUEN_FPEN);
 	regs->csr_euen = euen;
 	lose_fpu(0);
+	lose_lbt(0);
 
 	clear_thread_flag(TIF_LSX_CTX_LIVE);
 	clear_thread_flag(TIF_LASX_CTX_LIVE);
+	clear_thread_flag(TIF_LBT_CTX_LIVE);
 	clear_used_math();
 	regs->csr_era = pc;
 	regs->regs[3] = sp;
@@ -121,10 +124,14 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 
 	preempt_enable();
 
-	if (used_math())
-		memcpy(dst, src, sizeof(struct task_struct));
-	else
+	if (!used_math())
 		memcpy(dst, src, offsetof(struct task_struct, thread.fpu.fpr));
+	else
+		memcpy(dst, src, offsetof(struct task_struct, thread.lbt.scr0));
+
+#ifdef CONFIG_CPU_HAS_LBT
+	memcpy(&dst->thread.lbt, &src->thread.lbt, sizeof(struct loongarch_lbt));
+#endif
 
 	return 0;
 }
@@ -189,8 +196,10 @@ out:
 	ptrace_hw_copy_thread(p);
 	clear_tsk_thread_flag(p, TIF_USEDFPU);
 	clear_tsk_thread_flag(p, TIF_USEDSIMD);
+	clear_tsk_thread_flag(p, TIF_USEDLBT);
 	clear_tsk_thread_flag(p, TIF_LSX_CTX_LIVE);
 	clear_tsk_thread_flag(p, TIF_LASX_CTX_LIVE);
+	clear_tsk_thread_flag(p, TIF_LBT_CTX_LIVE);
 
 	return 0;
 }