The patch titled
Subject: arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area
has been removed from the -mm tree. Its filename was
arm64ia64ppcs390shtileumx86mm-remove-default-gate-area.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Subject: arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area
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@xxxxxxxxxxxxxx>
Acked-by: Nathan Lynch <nathan_lynch@xxxxxxxxxx>
Acked-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> [in principle]
Acked-by: Richard Weinberger <richard@xxxxxx> [for um]
Acked-by: Will Deacon <will.deacon@xxxxxxx> [for arm64]
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Nathan Lynch <Nathan_Lynch@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/page.h | 3 --
arch/arm64/kernel/vdso.c | 19 -------------
arch/ia64/include/asm/page.h | 2 +
arch/ia64/mm/init.c | 31 ++++++++++++++++++++++
arch/powerpc/include/asm/page.h | 3 --
arch/powerpc/kernel/vdso.c | 16 -----------
arch/s390/include/asm/page.h | 2 -
arch/s390/kernel/vdso.c | 15 ----------
arch/sh/include/asm/page.h | 5 ---
arch/sh/kernel/vsyscall/vsyscall.c | 15 ----------
arch/tile/include/asm/page.h | 6 ----
arch/tile/kernel/vdso.c | 15 ----------
arch/um/include/asm/page.h | 5 +++
arch/x86/include/asm/page.h | 1
arch/x86/include/asm/page_64.h | 2 +
arch/x86/um/asm/elf.h | 1
arch/x86/um/mem_64.c | 15 ----------
arch/x86/vdso/vdso32-setup.c | 19 -------------
include/linux/mm.h | 17 ++++++++----
mm/memory.c | 38 ---------------------------
mm/nommu.c | 5 ---
21 files changed, 53 insertions(+), 182 deletions(-)
diff -puN arch/arm64/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/arm64/include/asm/page.h
--- a/arch/arm64/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/arm64/include/asm/page.h
@@ -28,9 +28,6 @@
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
-/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
-#define __HAVE_ARCH_GATE_AREA 1
-
/*
* The idmap and swapper page tables need some space reserved in the kernel
* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
diff -puN arch/arm64/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/arm64/kernel/vdso.c
--- a/arch/arm64/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/arm64/kernel/vdso.c
@@ -195,25 +195,6 @@ up_fail:
}
/*
- * We define AT_SYSINFO_EHDR, so we need these function stubs to keep
- * Linux happy.
- */
-int in_gate_area_no_mm(unsigned long addr)
-{
- return 0;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long addr)
-{
- return 0;
-}
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
-
-/*
* Update the vDSO data page to keep in sync with kernel timekeeping.
*/
void update_vsyscall(struct timekeeper *tk)
diff -puN arch/ia64/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/ia64/include/asm/page.h
--- a/arch/ia64/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/ia64/include/asm/page.h
@@ -231,4 +231,6 @@ get_order (unsigned long size)
#define PERCPU_ADDR (-PERCPU_PAGE_SIZE)
#define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE)
+#define __HAVE_ARCH_GATE_AREA 1
+
#endif /* _ASM_IA64_PAGE_H */
diff -puN arch/ia64/mm/init.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/ia64/mm/init.c
--- a/arch/ia64/mm/init.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/ia64/mm/init.c
@@ -278,6 +278,37 @@ setup_gate (void)
ia64_patch_gate();
}
+static struct vm_area_struct gate_vma;
+
+static int __init gate_vma_init(void)
+{
+ gate_vma.vm_mm = NULL;
+ gate_vma.vm_start = FIXADDR_USER_START;
+ gate_vma.vm_end = FIXADDR_USER_END;
+ gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
+ gate_vma.vm_page_prot = __P101;
+
+ return 0;
+}
+__initcall(gate_vma_init);
+
+struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
+{
+ return &gate_vma;
+}
+
+int in_gate_area_no_mm(unsigned long addr)
+{
+ if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
+ return 1;
+ return 0;
+}
+
+int in_gate_area(struct mm_struct *mm, unsigned long addr)
+{
+ return in_gate_area_no_mm(addr);
+}
+
void ia64_mmu_init(void *my_cpu_data)
{
unsigned long pta, impl_va_bits;
diff -puN arch/powerpc/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/powerpc/include/asm/page.h
--- a/arch/powerpc/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/powerpc/include/asm/page.h
@@ -48,9 +48,6 @@ extern unsigned int HPAGE_SHIFT;
#define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1)
#endif
-/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
-#define __HAVE_ARCH_GATE_AREA 1
-
/*
* Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
* assign PAGE_MASK to a larger type it gets extended the way we want
diff -puN arch/powerpc/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/powerpc/kernel/vdso.c
--- a/arch/powerpc/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/powerpc/kernel/vdso.c
@@ -840,19 +840,3 @@ static int __init vdso_init(void)
return 0;
}
arch_initcall(vdso_init);
-
-int in_gate_area_no_mm(unsigned long addr)
-{
- return 0;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long addr)
-{
- return 0;
-}
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
-
diff -puN arch/s390/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/s390/include/asm/page.h
--- a/arch/s390/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/s390/include/asm/page.h
@@ -162,6 +162,4 @@ static inline int devmem_is_allowed(unsi
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
-#define __HAVE_ARCH_GATE_AREA 1
-
#endif /* _S390_PAGE_H */
diff -puN arch/s390/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/s390/kernel/vdso.c
--- a/arch/s390/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/s390/kernel/vdso.c
@@ -316,18 +316,3 @@ static int __init vdso_init(void)
return 0;
}
early_initcall(vdso_init);
-
-int in_gate_area_no_mm(unsigned long addr)
-{
- return 0;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long addr)
-{
- return 0;
-}
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
diff -puN arch/sh/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/sh/include/asm/page.h
--- a/arch/sh/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/sh/include/asm/page.h
@@ -186,11 +186,6 @@ typedef struct page *pgtable_t;
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
-/* vDSO support */
-#ifdef CONFIG_VSYSCALL
-#define __HAVE_ARCH_GATE_AREA
-#endif
-
/*
* Some drivers need to perform DMA into kmalloc'ed buffers
* and so we have to increase the kmalloc minalign for this.
diff -puN arch/sh/kernel/vsyscall/vsyscall.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/sh/kernel/vsyscall/vsyscall.c
--- a/arch/sh/kernel/vsyscall/vsyscall.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/sh/kernel/vsyscall/vsyscall.c
@@ -92,18 +92,3 @@ const char *arch_vma_name(struct vm_area
return NULL;
}
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long address)
-{
- return 0;
-}
-
-int in_gate_area_no_mm(unsigned long address)
-{
- return 0;
-}
diff -puN arch/tile/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/tile/include/asm/page.h
--- a/arch/tile/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/tile/include/asm/page.h
@@ -39,12 +39,6 @@
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
/*
- * We do define AT_SYSINFO_EHDR to support vDSO,
- * but don't use the gate mechanism.
- */
-#define __HAVE_ARCH_GATE_AREA 1
-
-/*
* If the Kconfig doesn't specify, set a maximum zone order that
* is enough so that we can create huge pages from small pages given
* the respective sizes of the two page types. See <linux/mmzone.h>.
diff -puN arch/tile/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/tile/kernel/vdso.c
--- a/arch/tile/kernel/vdso.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/tile/kernel/vdso.c
@@ -121,21 +121,6 @@ const char *arch_vma_name(struct vm_area
return NULL;
}
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long address)
-{
- return 0;
-}
-
-int in_gate_area_no_mm(unsigned long address)
-{
- return 0;
-}
-
int setup_vdso_pages(void)
{
struct page **pagelist;
diff -puN arch/um/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/um/include/asm/page.h
--- a/arch/um/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/um/include/asm/page.h
@@ -119,4 +119,9 @@ extern unsigned long uml_physmem;
#include <asm-generic/getorder.h>
#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_X86_32
+#define __HAVE_ARCH_GATE_AREA 1
+#endif
+
#endif /* __UM_PAGE_H */
diff -puN arch/x86/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/x86/include/asm/page.h
--- a/arch/x86/include/asm/page.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/x86/include/asm/page.h
@@ -70,7 +70,6 @@ extern bool __virt_addr_valid(unsigned l
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
-#define __HAVE_ARCH_GATE_AREA 1
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif /* __KERNEL__ */
diff -puN arch/x86/include/asm/page_64.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/x86/include/asm/page_64.h
--- a/arch/x86/include/asm/page_64.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/x86/include/asm/page_64.h
@@ -39,4 +39,6 @@ void copy_page(void *to, void *from);
#endif /* !__ASSEMBLY__ */
+#define __HAVE_ARCH_GATE_AREA 1
+
#endif /* _ASM_X86_PAGE_64_H */
diff -puN arch/x86/um/asm/elf.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/x86/um/asm/elf.h
--- a/arch/x86/um/asm/elf.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/x86/um/asm/elf.h
@@ -216,6 +216,5 @@ extern long elf_aux_hwcap;
#define ELF_HWCAP (elf_aux_hwcap)
#define SET_PERSONALITY(ex) do ; while(0)
-#define __HAVE_ARCH_GATE_AREA 1
#endif
diff -puN arch/x86/um/mem_64.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/x86/um/mem_64.c
--- a/arch/x86/um/mem_64.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/x86/um/mem_64.c
@@ -9,18 +9,3 @@ const char *arch_vma_name(struct vm_area
return NULL;
}
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long addr)
-{
- return 0;
-}
-
-int in_gate_area_no_mm(unsigned long addr)
-{
- return 0;
-}
diff -puN arch/x86/vdso/vdso32-setup.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area arch/x86/vdso/vdso32-setup.c
--- a/arch/x86/vdso/vdso32-setup.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/arch/x86/vdso/vdso32-setup.c
@@ -115,23 +115,6 @@ static __init int ia32_binfmt_init(void)
return 0;
}
__initcall(ia32_binfmt_init);
-#endif
-
-#else /* CONFIG_X86_32 */
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
- return NULL;
-}
-
-int in_gate_area(struct mm_struct *mm, unsigned long addr)
-{
- return 0;
-}
-
-int in_gate_area_no_mm(unsigned long addr)
-{
- return 0;
-}
+#endif /* CONFIG_SYSCTL */
#endif /* CONFIG_X86_64 */
diff -puN include/linux/mm.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area include/linux/mm.h
--- a/include/linux/mm.h~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/include/linux/mm.h
@@ -2014,13 +2014,20 @@ static inline bool kernel_page_present(s
#endif /* CONFIG_HIBERNATION */
#endif
+#ifdef __HAVE_ARCH_GATE_AREA
extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
-#ifdef __HAVE_ARCH_GATE_AREA
-int in_gate_area_no_mm(unsigned long addr);
-int in_gate_area(struct mm_struct *mm, unsigned long addr);
+extern int in_gate_area_no_mm(unsigned long addr);
+extern int in_gate_area(struct mm_struct *mm, unsigned long addr);
#else
-int in_gate_area_no_mm(unsigned long addr);
-#define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
+static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
+{
+ return NULL;
+}
+static inline int in_gate_area_no_mm(unsigned long addr) { return 0; }
+static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
+{
+ return 0;
+}
#endif /* __HAVE_ARCH_GATE_AREA */
#ifdef CONFIG_SYSCTL
diff -puN mm/memory.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area mm/memory.c
--- a/mm/memory.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/mm/memory.c
@@ -3430,44 +3430,6 @@ int __pmd_alloc(struct mm_struct *mm, pu
}
#endif /* __PAGETABLE_PMD_FOLDED */
-#if !defined(__HAVE_ARCH_GATE_AREA)
-
-#if defined(AT_SYSINFO_EHDR)
-static struct vm_area_struct gate_vma;
-
-static int __init gate_vma_init(void)
-{
- gate_vma.vm_mm = NULL;
- gate_vma.vm_start = FIXADDR_USER_START;
- gate_vma.vm_end = FIXADDR_USER_END;
- gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
- gate_vma.vm_page_prot = __P101;
-
- return 0;
-}
-__initcall(gate_vma_init);
-#endif
-
-struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
-{
-#ifdef AT_SYSINFO_EHDR
- return &gate_vma;
-#else
- return NULL;
-#endif
-}
-
-int in_gate_area_no_mm(unsigned long addr)
-{
-#ifdef AT_SYSINFO_EHDR
- if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
- return 1;
-#endif
- return 0;
-}
-
-#endif /* __HAVE_ARCH_GATE_AREA */
-
static int __follow_pte(struct mm_struct *mm, unsigned long address,
pte_t **ptepp, spinlock_t **ptlp)
{
diff -puN mm/nommu.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area mm/nommu.c
--- a/mm/nommu.c~arm64ia64ppcs390shtileumx86mm-remove-default-gate-area
+++ a/mm/nommu.c
@@ -1981,11 +1981,6 @@ error:
return -ENOMEM;
}
-int in_gate_area_no_mm(unsigned long addr)
-{
- return 0;
-}
-
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
BUG();
_
Patches currently in -mm which might be from luto@xxxxxxxxxxxxxx are
origin.patch
x86-vdso-fix-vdso2cs-special_pages-error-checking.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
