mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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1dbf527c51
Now that relocation of the VDSO for COMPAT_VDSO users is done at runtime rather than compile time, it is possible to enable/disable compat mode at runtime. This patch allows you to enable COMPAT_VDSO mode with "vdso=2" on the kernel command line, or via sysctl. (Switching on a running system shouldn't be done lightly; any process which was relying on the compat VDSO will be upset if it goes away.) The COMPAT_VDSO config option still exists, but if enabled it just makes vdso_enabled default to VDSO_COMPAT. +From: Hugh Dickins <hugh@veritas.com> Fix oops from i386-make-compat_vdso-runtime-selectable.patch. Even mingetty at system startup finds it easy to trigger an oops while reading /proc/PID/maps: though it has a good hold on the mm itself, that cannot stop exit_mm() from resetting tsk->mm to NULL. (It is usually show_map()'s call to get_gate_vma() which oopses, and I expect we could change that to check priv->tail_vma instead; but no matter, even m_start()'s call just after get_task_mm() is racy.) Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Zachary Amsden <zach@vmware.com> Cc: "Jan Beulich" <JBeulich@novell.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Andi Kleen <ak@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Roland McGrath <roland@redhat.com>
149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
#ifndef _I386_PAGE_H
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#define _I386_PAGE_H
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
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#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_X86_USE_3DNOW
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#include <asm/mmx.h>
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#define clear_page(page) mmx_clear_page((void *)(page))
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#define copy_page(to,from) mmx_copy_page(to,from)
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#else
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/*
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* On older X86 processors it's not a win to use MMX here it seems.
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* Maybe the K6-III ?
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*/
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
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#endif
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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/*
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* These are used to make use of C type-checking..
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*/
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extern int nx_enabled;
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#ifdef CONFIG_X86_PAE
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extern unsigned long long __supported_pte_mask;
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typedef struct { unsigned long pte_low, pte_high; } pte_t;
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typedef struct { unsigned long long pmd; } pmd_t;
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typedef struct { unsigned long long pgd; } pgd_t;
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typedef struct { unsigned long long pgprot; } pgprot_t;
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#define pmd_val(x) ((x).pmd)
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#define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
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#define __pmd(x) ((pmd_t) { (x) } )
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#define HPAGE_SHIFT 21
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#include <asm-generic/pgtable-nopud.h>
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#else
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typedef struct { unsigned long pte_low; } pte_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define boot_pte_t pte_t /* or would you rather have a typedef */
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#define pte_val(x) ((x).pte_low)
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#define HPAGE_SHIFT 22
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#include <asm-generic/pgtable-nopmd.h>
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#endif
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#define PTE_MASK PAGE_MASK
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#ifdef CONFIG_HUGETLB_PAGE
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#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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/*
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* This handles the memory map.. We could make this a config
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* option, but too many people screw it up, and too few need
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* it.
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*
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* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
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* a virtual address space of one gigabyte, which limits the
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* amount of physical memory you can use to about 950MB.
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*
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* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
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* and CONFIG_HIGHMEM64G options in the kernel configuration.
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*/
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#ifndef __ASSEMBLY__
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struct vm_area_struct;
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/*
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* This much address space is reserved for vmalloc() and iomap()
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* as well as fixmap mappings.
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*/
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extern unsigned int __VMALLOC_RESERVE;
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extern int sysctl_legacy_va_layout;
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extern int page_is_ram(unsigned long pagenr);
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#endif /* __ASSEMBLY__ */
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#ifdef __ASSEMBLY__
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#define __PAGE_OFFSET CONFIG_PAGE_OFFSET
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#else
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#define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
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#endif
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#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
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#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
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#define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
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/* __pa_symbol should be used for C visible symbols.
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This seems to be the official gcc blessed way to do such arithmetic. */
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#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#endif /* CONFIG_FLATMEM */
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS \
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(VM_READ | VM_WRITE | \
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((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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#define __HAVE_ARCH_GATE_AREA 1
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#endif /* __KERNEL__ */
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#endif /* _I386_PAGE_H */
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