[PATCH v3 11/23] s390/vdso: Remove vdso_base pointer from mm->context

[Dmitry Safonov]

Not used any more: now sysinfo_ehdr is passed back from
arch_setup_additional_pages() to set AT_SYSINFO_EHDR tag.
.vdso_mremap() was only to track proper position of context.vdso
throughout any mremap() syscalls, remove it too.

Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: linux-s390@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx>
---
 arch/s390/include/asm/mmu.h | 1 -
 arch/s390/kernel/vdso.c     | 9 ---------
 2 files changed, 10 deletions(-)

diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index e12ff0f29d1a..095d0596f700 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -15,7 +15,6 @@ typedef struct {
 	unsigned long gmap_asce;
 	unsigned long asce;
 	unsigned long asce_limit;
-	unsigned long vdso_base;
 	/* The mmu context belongs to a secure guest. */
 	atomic_t is_protected;
 	/*
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 8a72fdedbae9..b8fb43d3b657 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -143,13 +143,6 @@ static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
 	return vmf_insert_pfn(vma, vmf->address, pfn);
 }
 
-static int vdso_mremap(const struct vm_special_mapping *sm,
-		       struct vm_area_struct *vma)
-{
-	current->mm->context.vdso_base = vma->vm_start;
-	return 0;
-}
-
 static struct vm_special_mapping vvar_mapping = {
 	.name = "[vvar]",
 	.fault = vvar_fault,
@@ -157,7 +150,6 @@ static struct vm_special_mapping vvar_mapping = {
 
 static struct vm_special_mapping vdso_mapping = {
 	.name = "[vdso]",
-	.mremap = vdso_mremap,
 };
 
 int vdso_getcpu_init(void)
@@ -203,7 +195,6 @@ int arch_setup_additional_pages(unsigned long *sysinfo_ehdr)
 		do_munmap(mm, vvar_start, PAGE_SIZE, NULL);
 		rc = PTR_ERR(vma);
 	} else {
-		current->mm->context.vdso_base = vdso_text_start;
 		*sysinfo_ehdr = vdso_text_start;
 		rc = 0;
 	}
-- 
2.31.1