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powerpc/vdso: Move to _install_special_mapping() and remove arch_vma_name()

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Copied from commit 2fea7f6c98 ("arm64: vdso: move to
_install_special_mapping and remove arch_vma_name").

Use the new _install_special_mapping() API added by
commit a62c34bd2a ("x86, mm: Improve _install_special_mapping
and fix x86 vdso naming") which obsolete install_special_mapping().

And remove arch_vma_name() as the name is handled by the new API.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: kernel test robot <lkp@intel.com>
[mpe: Squash fix to use PTR_ERR_OR_ZERO() from lkp]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e7e5dfe0f93234e31051f2a610b4b07f50b0082f.1601197618.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-09-27 09:16:27 +00:00 committed by Michael Ellerman
parent b2df3f60b4
commit c1bab64360
1 changed files with 19 additions and 23 deletions
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42
arch/powerpc/kernel/vdso.c
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@ -49,7 +49,6 @@
static unsigned int vdso32_pages;
static void *vdso32_kbase;
static struct page **vdso32_pagelist;
unsigned long vdso32_sigtramp;
unsigned long vdso32_rt_sigtramp;
@ -57,7 +56,6 @@ extern char vdso32_start, vdso32_end;
extern char vdso64_start, vdso64_end;
static void *vdso64_kbase = &vdso64_start;
static unsigned int vdso64_pages;
static struct page **vdso64_pagelist;
#ifdef CONFIG_PPC64
unsigned long vdso64_rt_sigtramp;
#endif /* CONFIG_PPC64 */
@ -118,6 +116,14 @@ struct lib64_elfinfo
};
static struct vm_special_mapping vdso32_spec __ro_after_init = {
.name = "[vdso]",
};
static struct vm_special_mapping vdso64_spec __ro_after_init = {
.name = "[vdso]",
};
/*
* This is called from binfmt_elf, we create the special vma for the
* vDSO and insert it into the mm struct tree
@ -125,17 +131,17 @@ struct lib64_elfinfo
static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
struct mm_struct *mm = current->mm;
struct page **vdso_pagelist;
struct vm_special_mapping *vdso_spec;
struct vm_area_struct *vma;
unsigned long vdso_size;
unsigned long vdso_base;
int rc;
if (is_32bit_task()) {
vdso_pagelist = vdso32_pagelist;
vdso_spec = &vdso32_spec;
vdso_size = &vdso32_end - &vdso32_start;
vdso_base = VDSO32_MBASE;
} else {
vdso_pagelist = vdso64_pagelist;
vdso_spec = &vdso64_spec;
vdso_size = &vdso64_end - &vdso64_start;
/*
* On 64bit we don't have a preferred map address. This
@ -166,7 +172,7 @@ static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_int
/*
* Put vDSO base into mm struct. We need to do this before calling
* install_special_mapping or the perf counter mmap tracking code
* will fail to recognise it as a vDSO (since arch_vma_name fails).
* will fail to recognise it as a vDSO.
*/
current->mm->context.vdso_base = vdso_base;
@ -180,11 +186,10 @@ static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_int
* It's fine to use that for setting breakpoints in the vDSO code
* pages though.
*/
rc = install_special_mapping(mm, vdso_base, vdso_size,
VM_READ|VM_EXEC|
VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
vdso_pagelist);
return rc;
vma = _install_special_mapping(mm, vdso_base, vdso_size,
VM_READ | VM_EXEC | VM_MAYREAD |
VM_MAYWRITE | VM_MAYEXEC, vdso_spec);
return PTR_ERR_OR_ZERO(vma);
}
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
@ -208,15 +213,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
return rc;
}
const char *arch_vma_name(struct vm_area_struct *vma)
{
if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
return "[vdso]";
return NULL;
}
#ifdef CONFIG_VDSO32
static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
unsigned long *size)
@ -737,10 +733,10 @@ static int __init vdso_init(void)
}
if (IS_ENABLED(CONFIG_VDSO32))
vdso32_pagelist = vdso_setup_pages(&vdso32_start, &vdso32_end);
vdso32_spec.pages = vdso_setup_pages(&vdso32_start, &vdso32_end);
if (IS_ENABLED(CONFIG_PPC64))
vdso64_pagelist = vdso_setup_pages(&vdso64_start, &vdso64_end);
vdso64_spec.pages = vdso_setup_pages(&vdso64_start, &vdso64_end);
smp_wmb();
vdso_ready = 1;