Hi all,

After merging the maple tree, today's linux-next build (arm64 defconfig)
failed like this:

arch/arm64/kernel/elfcore.c: In function 'elf_core_extra_phdrs':
arch/arm64/kernel/elfcore.c:13:35: error: 'struct mm_struct' has no member named 'mmap'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                   ^~
arch/arm64/kernel/elfcore.c:69:9: note: in expansion of macro 'for_each_mte_vma'
   69 |         for_each_mte_vma(current, vma)
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c:13:57: error: 'struct vm_area_struct' has no member named 'vm_next'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                                         ^~
arch/arm64/kernel/elfcore.c:69:9: note: in expansion of macro 'for_each_mte_vma'
   69 |         for_each_mte_vma(current, vma)
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c: In function 'elf_core_write_extra_phdrs':
arch/arm64/kernel/elfcore.c:13:35: error: 'struct mm_struct' has no member named 'mmap'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                   ^~
arch/arm64/kernel/elfcore.c:79:9: note: in expansion of macro 'for_each_mte_vma'
   79 |         for_each_mte_vma(current, vma) {
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c:13:57: error: 'struct vm_area_struct' has no member named 'vm_next'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                                         ^~
arch/arm64/kernel/elfcore.c:79:9: note: in expansion of macro 'for_each_mte_vma'
   79 |         for_each_mte_vma(current, vma) {
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c: In function 'elf_core_extra_data_size':
arch/arm64/kernel/elfcore.c:13:35: error: 'struct mm_struct' has no member named 'mmap'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                   ^~
arch/arm64/kernel/elfcore.c:104:9: note: in expansion of macro 'for_each_mte_vma'
  104 |         for_each_mte_vma(current, vma)
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c:13:57: error: 'struct vm_area_struct' has no member named 'vm_next'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                                         ^~
arch/arm64/kernel/elfcore.c:104:9: note: in expansion of macro 'for_each_mte_vma'
  104 |         for_each_mte_vma(current, vma)
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c: In function 'elf_core_write_extra_data':
arch/arm64/kernel/elfcore.c:13:35: error: 'struct mm_struct' has no member named 'mmap'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                   ^~
arch/arm64/kernel/elfcore.c:114:9: note: in expansion of macro 'for_each_mte_vma'
  114 |         for_each_mte_vma(current, vma) {
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kernel/elfcore.c:13:57: error: 'struct vm_area_struct' has no member named 'vm_next'
   13 |                 for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)      \
      |                                                         ^~
arch/arm64/kernel/elfcore.c:114:9: note: in expansion of macro 'for_each_mte_vma'
  114 |         for_each_mte_vma(current, vma) {
      |         ^~~~~~~~~~~~~~~~

Caused by commit

  b09e8361a4c3 ("mm: Remove the vma linked list")

interacting with commit

  6dd8b1a0b6cb ("arm64: mte: Dump the MTE tags in the core file")

from the arm64 tree.

I have applied the following merge fix patch for today:

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Thu, 17 Feb 2022 19:12:41 +1100
Subject: [PATCH] fix up for "arm64: mte: Dump the MTE tags in the core file"

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 arch/arm64/kernel/elfcore.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/kernel/elfcore.c b/arch/arm64/kernel/elfcore.c
index 3455ee4acc04..35f99088825e 100644
--- a/arch/arm64/kernel/elfcore.c
+++ b/arch/arm64/kernel/elfcore.c
@@ -8,9 +8,9 @@
 #include <asm/cpufeature.h>
 #include <asm/mte.h>
 
-#define for_each_mte_vma(tsk, vma)					\
+#define for_each_mte_vma(mas, vma)					\
 	if (system_supports_mte())					\
-		for (vma = tsk->mm->mmap; vma; vma = vma->vm_next)	\
+		mas_for_each(&mas, vma, ULONG_MAX)			\
 			if (vma->vm_flags & VM_MTE)
 
 static unsigned long mte_vma_tag_dump_size(struct vm_area_struct *vma)
@@ -64,9 +64,10 @@ static int mte_dump_tag_range(struct coredump_params *cprm,
 Elf_Half elf_core_extra_phdrs(void)
 {
 	struct vm_area_struct *vma;
+	MA_STATE(mas, &current->mm->mm_mt, 0, 0);
 	int vma_count = 0;
 
-	for_each_mte_vma(current, vma)
+	for_each_mte_vma(mas, vma)
 		vma_count++;
 
 	return vma_count;
@@ -75,8 +76,9 @@ Elf_Half elf_core_extra_phdrs(void)
 int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
 {
 	struct vm_area_struct *vma;
+	MA_STATE(mas, &current->mm->mm_mt, 0, 0);
 
-	for_each_mte_vma(current, vma) {
+	for_each_mte_vma(mas, vma) {
 		struct elf_phdr phdr;
 
 		phdr.p_type = PT_ARM_MEMTAG_MTE;
@@ -99,9 +101,10 @@ int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
 size_t elf_core_extra_data_size(void)
 {
 	struct vm_area_struct *vma;
+	MA_STATE(mas, &current->mm->mm_mt, 0, 0);
 	size_t data_size = 0;
 
-	for_each_mte_vma(current, vma)
+	for_each_mte_vma(mas, vma)
 		data_size += mte_vma_tag_dump_size(vma);
 
 	return data_size;
@@ -110,8 +113,9 @@ size_t elf_core_extra_data_size(void)
 int elf_core_write_extra_data(struct coredump_params *cprm)
 {
 	struct vm_area_struct *vma;
+	MA_STATE(mas, &current->mm->mm_mt, 0, 0);
 
-	for_each_mte_vma(current, vma) {
+	for_each_mte_vma(mas, vma) {
 		if (vma->vm_flags & VM_DONTDUMP)
 			continue;
 
-- 
2.34.1

-- 
Cheers,
Stephen Rothwell