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>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
#ifndef _ASM_X86_PAGE_H
|
|
#define _ASM_X86_PAGE_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/page_types.h>
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#include <asm/page_64.h>
|
|
#else
|
|
#include <asm/page_32.h>
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
struct page;
|
|
|
|
#include <linux/range.h>
|
|
extern struct range pfn_mapped[];
|
|
extern int nr_pfn_mapped;
|
|
|
|
static inline void clear_user_page(void *page, unsigned long vaddr,
|
|
struct page *pg)
|
|
{
|
|
clear_page(page);
|
|
}
|
|
|
|
static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
|
|
struct page *topage)
|
|
{
|
|
copy_page(to, from);
|
|
}
|
|
|
|
#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
|
|
alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
|
|
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
|
|
|
|
#define __pa(x) __phys_addr((unsigned long)(x))
|
|
#define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x))
|
|
/* __pa_symbol should be used for C visible symbols.
|
|
This seems to be the official gcc blessed way to do such arithmetic. */
|
|
/*
|
|
* We need __phys_reloc_hide() here because gcc may assume that there is no
|
|
* overflow during __pa() calculation and can optimize it unexpectedly.
|
|
* Newer versions of gcc provide -fno-strict-overflow switch to handle this
|
|
* case properly. Once all supported versions of gcc understand it, we can
|
|
* remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
|
|
*/
|
|
#define __pa_symbol(x) \
|
|
__phys_addr_symbol(__phys_reloc_hide((unsigned long)(x)))
|
|
|
|
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
|
|
|
|
#define __boot_va(x) __va(x)
|
|
#define __boot_pa(x) __pa(x)
|
|
|
|
/*
|
|
* virt_to_page(kaddr) returns a valid pointer if and only if
|
|
* virt_addr_valid(kaddr) returns true.
|
|
*/
|
|
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
|
|
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
|
|
extern bool __virt_addr_valid(unsigned long kaddr);
|
|
#define virt_addr_valid(kaddr) __virt_addr_valid((unsigned long) (kaddr))
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#include <asm-generic/memory_model.h>
|
|
#include <asm-generic/getorder.h>
|
|
|
|
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_X86_PAGE_H */
|