The patch titled
SH vdso: use install_special_mapping()
has been added to the -mm tree. Its filename is
sh-vdso-use-install_special_mappingpatch.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: SH vdso: use install_special_mapping()
From: Paul Mundt <lethal@xxxxxxxxxxxx>
Signed-off-by: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/sh/kernel/vsyscall/vsyscall.c | 58 ++++-----------------------
1 file changed, 9 insertions(+), 49 deletions(-)
diff -puN arch/sh/kernel/vsyscall/vsyscall.c~sh-vdso-use-install_special_mappingpatch arch/sh/kernel/vsyscall/vsyscall.c
--- a/arch/sh/kernel/vsyscall/vsyscall.c~sh-vdso-use-install_special_mappingpatch
+++ a/arch/sh/kernel/vsyscall/vsyscall.c
@@ -37,11 +37,12 @@ __setup("vdso=", vdso_setup);
* of the ELF DSO images included therein.
*/
extern const char vsyscall_trapa_start, vsyscall_trapa_end;
-static void *syscall_page;
+static struct page *syscall_pages[1];
int __init vsyscall_init(void)
{
- syscall_page = (void *)get_zeroed_page(GFP_ATOMIC);
+ void *syscall_page = (void *)get_zeroed_page(GFP_ATOMIC);
+ syscall_pages[0] = virt_to_page(syscall_page);
/*
* XXX: Map this page to a fixmap entry if we get around
@@ -55,37 +56,10 @@ int __init vsyscall_init(void)
return 0;
}
-static struct page *syscall_vma_nopage(struct vm_area_struct *vma,
- unsigned long address, int *type)
-{
- unsigned long offset = address - vma->vm_start;
- struct page *page;
-
- if (address < vma->vm_start || address > vma->vm_end)
- return NOPAGE_SIGBUS;
-
- page = virt_to_page(syscall_page + offset);
-
- get_page(page);
-
- return page;
-}
-
-/* Prevent VMA merging */
-static void syscall_vma_close(struct vm_area_struct *vma)
-{
-}
-
-static struct vm_operations_struct syscall_vm_ops = {
- .nopage = syscall_vma_nopage,
- .close = syscall_vma_close,
-};
-
/* Setup a VMA at program startup for the vsyscall page */
int arch_setup_additional_pages(struct linux_binprm *bprm,
int executable_stack)
{
- struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
unsigned long addr;
int ret;
@@ -97,30 +71,16 @@ int arch_setup_additional_pages(struct l
goto up_fail;
}
- vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
- if (!vma) {
- ret = -ENOMEM;
+ ret = install_special_mapping(mm, addr, PAGE_SIZE,
+ VM_READ | VM_EXEC |
+ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |
+ VM_ALWAYSDUMP,
+ syscall_pages);
+ if (unlikely(ret))
goto up_fail;
- }
-
- vma->vm_start = addr;
- vma->vm_end = addr + PAGE_SIZE;
- /* MAYWRITE to allow gdb to COW and set breakpoints */
- vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYEXEC|VM_MAYWRITE;
- vma->vm_flags |= mm->def_flags;
- vma->vm_page_prot = protection_map[vma->vm_flags & 7];
- vma->vm_ops = &syscall_vm_ops;
- vma->vm_mm = mm;
-
- ret = insert_vm_struct(mm, vma);
- if (unlikely(ret)) {
- kmem_cache_free(vm_area_cachep, vma);
- goto up_fail;
- }
current->mm->context.vdso = (void *)addr;
- mm->total_vm++;
up_fail:
up_write(&mm->mmap_sem);
return ret;
_
Patches currently in -mm which might be from lethal@xxxxxxxxxxxx are
rtc-sh-act-on-rtc_wkalrmenabled-when-setting-an-alarm.patch
sh-vdso-use-install_special_mappingpatch.patch
git-avr32.patch
git-sh.patch
deal-with-cases-of-zone_dma-meaning-the-first-zone.patch
introduce-config_zone_dma.patch
optional-zone_dma-in-the-vm.patch
remove-zone_dma-remains-from-sh-sh64.patch
simplify-the-stacktrace-code.patch
dynamic-kernel-command-line-common.patch
dynamic-kernel-command-line-sh.patch
dynamic-kernel-command-line-sh64.patch
sysctl-c99-convert-arch-sh64-kernel-trapsc-and-remove-abi-breakage.patch
-
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