a6c19dfe39
The core mm code will provide a default gate area based on FIXADDR_USER_START and FIXADDR_USER_END if !defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR). This default is only useful for ia64. arm64, ppc, s390, sh, tile, 64-bit UML, and x86_32 have their own code just to disable it. arm, 32-bit UML, and x86_64 have gate areas, but they have their own implementations. This gets rid of the default and moves the code into ia64. This should save some code on architectures without a gate area: it's now possible to inline the gate_area functions in the default case. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Acked-by: Nathan Lynch <nathan_lynch@mentor.com> Acked-by: H. Peter Anvin <hpa@linux.intel.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [in principle] Acked-by: Richard Weinberger <richard@nod.at> [for um] Acked-by: Will Deacon <will.deacon@arm.com> [for arm64] Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Nathan Lynch <Nathan_Lynch@mentor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
#ifndef _ASM_X86_PAGE_H
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#define _ASM_X86_PAGE_H
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#include <linux/types.h>
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#ifdef __KERNEL__
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#include <asm/page_types.h>
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#ifdef CONFIG_X86_64
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#include <asm/page_64.h>
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#else
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#include <asm/page_32.h>
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#endif /* CONFIG_X86_64 */
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#ifndef __ASSEMBLY__
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struct page;
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#include <linux/range.h>
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extern struct range pfn_mapped[];
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extern int nr_pfn_mapped;
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static inline void clear_user_page(void *page, unsigned long vaddr,
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struct page *pg)
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{
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clear_page(page);
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}
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static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
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struct page *topage)
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{
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copy_page(to, from);
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}
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#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
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alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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#define __pa(x) __phys_addr((unsigned long)(x))
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#define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x))
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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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/*
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* We need __phys_reloc_hide() here because gcc may assume that there is no
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* overflow during __pa() calculation and can optimize it unexpectedly.
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* Newer versions of gcc provide -fno-strict-overflow switch to handle this
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* case properly. Once all supported versions of gcc understand it, we can
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* remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
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*/
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#define __pa_symbol(x) \
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__phys_addr_symbol(__phys_reloc_hide((unsigned long)(x)))
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#define __boot_va(x) __va(x)
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#define __boot_pa(x) __pa(x)
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/*
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* virt_to_page(kaddr) returns a valid pointer if and only if
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* virt_addr_valid(kaddr) returns true.
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*/
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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extern bool __virt_addr_valid(unsigned long kaddr);
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#define virt_addr_valid(kaddr) __virt_addr_valid((unsigned long) (kaddr))
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#endif /* __ASSEMBLY__ */
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#include <asm-generic/memory_model.h>
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#include <asm-generic/getorder.h>
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_PAGE_H */
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