Merge tag 'loongarch-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch updates from Huacai Chen:

 - Fix objtool about do_syscall() and Clang

 - Enable generic CPU vulnerabilites support

 - Enable ACPI BGRT handling

 - Rework CPU feature probe from CPUCFG/IOCSR

 - Add ARCH_HAS_SET_MEMORY support

 - Add ARCH_HAS_SET_DIRECT_MAP support

 - Improve hardware page table walker

 - Simplify _percpu_read() and _percpu_write()

 - Add advanced extended IRQ model documentions

 - Some bug fixes and other small changes

* tag 'loongarch-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  Docs/LoongArch: Add advanced extended IRQ model description
  LoongArch: Remove posix_types.h include from sigcontext.h
  LoongArch: Fix memleak in pci_acpi_scan_root()
  LoongArch: Simplify _percpu_read() and _percpu_write()
  LoongArch: Improve hardware page table walker
  LoongArch: Add ARCH_HAS_SET_DIRECT_MAP support
  LoongArch: Add ARCH_HAS_SET_MEMORY support
  LoongArch: Rework CPU feature probe from CPUCFG/IOCSR
  LoongArch: Enable ACPI BGRT handling
  LoongArch: Enable generic CPU vulnerabilites support
  LoongArch: Remove STACK_FRAME_NON_STANDARD(do_syscall)
  LoongArch: Set AS_HAS_THIN_ADD_SUB as y if AS_IS_LLVM
  LoongArch: Enable objtool for Clang
  objtool: Handle frame pointer related instructions

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c
index 97b40defde06..deefd9617d00 100644
--- a/arch/loongarch/mm/fault.c
+++ b/arch/loongarch/mm/fault.c
@@ -31,11 +31,52 @@
 
 int show_unhandled_signals = 1;
 
+static int __kprobes spurious_fault(unsigned long write, unsigned long address)
+{
+	pgd_t *pgd;
+	p4d_t *p4d;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+
+	if (!(address & __UA_LIMIT))
+		return 0;
+
+	pgd = pgd_offset_k(address);
+	if (!pgd_present(pgdp_get(pgd)))
+		return 0;
+
+	p4d = p4d_offset(pgd, address);
+	if (!p4d_present(p4dp_get(p4d)))
+		return 0;
+
+	pud = pud_offset(p4d, address);
+	if (!pud_present(pudp_get(pud)))
+		return 0;
+
+	pmd = pmd_offset(pud, address);
+	if (!pmd_present(pmdp_get(pmd)))
+		return 0;
+
+	if (pmd_leaf(*pmd)) {
+		return write ? pmd_write(pmdp_get(pmd)) : 1;
+	} else {
+		pte = pte_offset_kernel(pmd, address);
+		if (!pte_present(ptep_get(pte)))
+			return 0;
+
+		return write ? pte_write(ptep_get(pte)) : 1;
+	}
+}
+
 static void __kprobes no_context(struct pt_regs *regs,
 			unsigned long write, unsigned long address)
 {
 	const int field = sizeof(unsigned long) * 2;
 
+	if (spurious_fault(write, address))
+		return;
+
 	/* Are we prepared to handle this kernel fault?	 */
 	if (fixup_exception(regs))
 		return;