powerpc/vdso: Move to _install_special_mapping() and remove arch_vma_name()
Copied from commit2fea7f6c98
("arm64: vdso: move to _install_special_mapping and remove arch_vma_name"). Use the new _install_special_mapping() API added by commita62c34bd2a
("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
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@ -49,7 +49,6 @@
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static unsigned int vdso32_pages;
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static void *vdso32_kbase;
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static struct page **vdso32_pagelist;
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unsigned long vdso32_sigtramp;
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unsigned long vdso32_rt_sigtramp;
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@ -57,7 +56,6 @@ extern char vdso32_start, vdso32_end;
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extern char vdso64_start, vdso64_end;
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static void *vdso64_kbase = &vdso64_start;
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static unsigned int vdso64_pages;
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static struct page **vdso64_pagelist;
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#ifdef CONFIG_PPC64
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unsigned long vdso64_rt_sigtramp;
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#endif /* CONFIG_PPC64 */
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@ -118,6 +116,14 @@ struct lib64_elfinfo
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};
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static struct vm_special_mapping vdso32_spec __ro_after_init = {
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.name = "[vdso]",
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};
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static struct vm_special_mapping vdso64_spec __ro_after_init = {
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.name = "[vdso]",
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};
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/*
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* This is called from binfmt_elf, we create the special vma for the
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* vDSO and insert it into the mm struct tree
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@ -125,17 +131,17 @@ struct lib64_elfinfo
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static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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{
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struct mm_struct *mm = current->mm;
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struct page **vdso_pagelist;
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struct vm_special_mapping *vdso_spec;
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struct vm_area_struct *vma;
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unsigned long vdso_size;
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unsigned long vdso_base;
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int rc;
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if (is_32bit_task()) {
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vdso_pagelist = vdso32_pagelist;
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vdso_spec = &vdso32_spec;
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vdso_size = &vdso32_end - &vdso32_start;
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vdso_base = VDSO32_MBASE;
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} else {
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vdso_pagelist = vdso64_pagelist;
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vdso_spec = &vdso64_spec;
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vdso_size = &vdso64_end - &vdso64_start;
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/*
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* On 64bit we don't have a preferred map address. This
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@ -166,7 +172,7 @@ static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_int
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/*
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* Put vDSO base into mm struct. We need to do this before calling
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* install_special_mapping or the perf counter mmap tracking code
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* will fail to recognise it as a vDSO (since arch_vma_name fails).
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* will fail to recognise it as a vDSO.
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*/
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current->mm->context.vdso_base = vdso_base;
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@ -180,11 +186,10 @@ static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_int
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* It's fine to use that for setting breakpoints in the vDSO code
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* pages though.
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*/
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rc = install_special_mapping(mm, vdso_base, vdso_size,
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VM_READ|VM_EXEC|
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
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vdso_pagelist);
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return rc;
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vma = _install_special_mapping(mm, vdso_base, vdso_size,
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VM_READ | VM_EXEC | VM_MAYREAD |
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VM_MAYWRITE | VM_MAYEXEC, vdso_spec);
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return PTR_ERR_OR_ZERO(vma);
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}
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int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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@ -208,15 +213,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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return rc;
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}
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const char *arch_vma_name(struct vm_area_struct *vma)
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{
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if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
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return "[vdso]";
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return NULL;
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}
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#ifdef CONFIG_VDSO32
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static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
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unsigned long *size)
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@ -737,10 +733,10 @@ static int __init vdso_init(void)
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}
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if (IS_ENABLED(CONFIG_VDSO32))
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vdso32_pagelist = vdso_setup_pages(&vdso32_start, &vdso32_end);
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vdso32_spec.pages = vdso_setup_pages(&vdso32_start, &vdso32_end);
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if (IS_ENABLED(CONFIG_PPC64))
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vdso64_pagelist = vdso_setup_pages(&vdso64_start, &vdso64_end);
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vdso64_spec.pages = vdso_setup_pages(&vdso64_start, &vdso64_end);
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smp_wmb();
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vdso_ready = 1;
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