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Subject[PATCH 6/7] powerpc/vdso: switch from legacy_special_mapping_vmops
Date
This will allow to introduce mremap hook (the next patch).

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-mm@kvack.org
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
---
arch/powerpc/kernel/vdso.c | 19 +++++++++++--------
arch/powerpc/kernel/vdso_common.c | 8 ++++++--
2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index e68601ffc9ad..9ee3fd65c6e9 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -51,7 +51,7 @@
#define VDSO_ALIGNMENT (1 << 16)

static unsigned int vdso32_pages;
-static struct page **vdso32_pagelist;
+static struct vm_special_mapping vdso32_mapping;
unsigned long vdso32_sigtramp;
unsigned long vdso32_rt_sigtramp;

@@ -64,7 +64,7 @@ static void *vdso32_kbase;
extern char vdso64_start, vdso64_end;
static void *vdso64_kbase = &vdso64_start;
static unsigned int vdso64_pages;
-static struct page **vdso64_pagelist;
+static struct vm_special_mapping vdso64_mapping;
unsigned long vdso64_rt_sigtramp;
#endif /* CONFIG_PPC64 */

@@ -143,10 +143,11 @@ struct lib64_elfinfo
unsigned long text;
};

-static int map_vdso(struct page **vdso_pagelist, unsigned long vdso_pages,
+static int map_vdso(struct vm_special_mapping *vsm, unsigned long vdso_pages,
unsigned long vdso_base)
{
struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
int ret = 0;

mm->context.vdso_base = 0;
@@ -198,12 +199,14 @@ static int map_vdso(struct page **vdso_pagelist, unsigned long vdso_pages,
* It's fine to use that for setting breakpoints in the vDSO code
* pages though.
*/
- ret = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+ vma = _install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
VM_READ|VM_EXEC|
VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
- vdso_pagelist);
- if (ret)
+ vsm);
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
current->mm->context.vdso_base = 0;
+ }

out_up_mmap_sem:
up_write(&mm->mmap_sem);
@@ -220,7 +223,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
return 0;

if (is_32bit_task())
- return map_vdso(vdso32_pagelist, vdso32_pages, VDSO32_MBASE);
+ return map_vdso(&vdso32_mapping, vdso32_pages, VDSO32_MBASE);
#ifdef CONFIG_PPC64
else
/*
@@ -228,7 +231,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
* allows get_unmapped_area to find an area near other mmaps
* and most likely share a SLB entry.
*/
- return map_vdso(vdso64_pagelist, vdso64_pages, 0);
+ return map_vdso(&vdso64_mapping, vdso64_pages, 0);
#endif
WARN_ONCE(1, "task is not 32-bit on non PPC64 kernel");
return -1;
diff --git a/arch/powerpc/kernel/vdso_common.c b/arch/powerpc/kernel/vdso_common.c
index c97c30606b3f..047f6b8b230f 100644
--- a/arch/powerpc/kernel/vdso_common.c
+++ b/arch/powerpc/kernel/vdso_common.c
@@ -14,7 +14,7 @@
#define VDSO_LBASE CONCAT3(VDSO, BITS, _LBASE)
#define vdso_kbase CONCAT3(vdso, BITS, _kbase)
#define vdso_pages CONCAT3(vdso, BITS, _pages)
-#define vdso_pagelist CONCAT3(vdso, BITS, _pagelist)
+#define vdso_mapping CONCAT3(vdso, BITS, _mapping)

#undef pr_fmt
#define pr_fmt(fmt) "vDSO" __stringify(BITS) ": " fmt
@@ -207,6 +207,7 @@ static __init int vdso_setup(struct lib_elfinfo *v)
static __init void init_vdso_pagelist(void)
{
int i;
+ struct page **vdso_pagelist;

/* Make sure pages are in the correct state */
vdso_pagelist = kzalloc(sizeof(struct page *) * (vdso_pages + 2),
@@ -221,6 +222,9 @@ static __init void init_vdso_pagelist(void)
}
vdso_pagelist[i++] = virt_to_page(vdso_data);
vdso_pagelist[i] = NULL;
+
+ vdso_mapping.pages = vdso_pagelist;
+ vdso_mapping.name = "[vdso]";
}

#undef find_section
@@ -236,7 +240,7 @@ static __init void init_vdso_pagelist(void)
#undef VDSO_LBASE
#undef vdso_kbase
#undef vdso_pages
-#undef vdso_pagelist
+#undef vdso_mapping
#undef lib_elfinfo
#undef BITS
#undef _CONCAT3
--
2.10.0
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