Merge v6.12.35linux-rolling-lts

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 9 insertions, 7 deletions

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 19a4988621ac..88029d38b3c6 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -48,7 +48,7 @@ KBUILD_CFLAGS	+= $(CC_FLAGS_NO_FPU) \
 KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
 KBUILD_AFLAGS	+= $(compat_vdso)
 
-ifeq ($(call test-ge, $(CONFIG_RUSTC_VERSION), 108500),y)
+ifeq ($(call rustc-min-version, 108500),y)
 KBUILD_RUSTFLAGS += --target=aarch64-unknown-none-softfloat
 else
 KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 9edbd871c31b..5f12cdc2b967 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -330,13 +330,14 @@ static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *b
 }
 
 /*
- * If mprotect/munmap/etc occurs during TLB batched flushing, we need to
- * synchronise all the TLBI issued with a DSB to avoid the race mentioned in
- * flush_tlb_batched_pending().
+ * If mprotect/munmap/etc occurs during TLB batched flushing, we need to ensure
+ * all the previously issued TLBIs targeting mm have completed. But since we
+ * can be executing on a remote CPU, a DSB cannot guarantee this like it can
+ * for arch_tlbbatch_flush(). Our only option is to flush the entire mm.
  */
 static inline void arch_flush_tlb_batched_pending(struct mm_struct *mm)
 {
-	dsb(ish);
+	flush_tlb_mm(mm);
 }
 
 /*
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 1559a239137f..1a8f4284cb69 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -140,7 +140,7 @@ unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
 
 	addr += n;
 	if (regs_within_kernel_stack(regs, (unsigned long)addr))
-		return *addr;
+		return READ_ONCE_NOCHECK(*addr);
 	else
 		return 0;
 }
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 9bcd51fd67d4..aed8d32979d9 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1285,7 +1285,8 @@ int pud_free_pmd_page(pud_t *pudp, unsigned long addr)
 	next = addr;
 	end = addr + PUD_SIZE;
 	do {
-		pmd_free_pte_page(pmdp, next);
+		if (pmd_present(pmdp_get(pmdp)))
+			pmd_free_pte_page(pmdp, next);
 	} while (pmdp++, next += PMD_SIZE, next != end);
 
 	pud_clear(pudp);