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um: take ldt.h to arch/x86/um/asm/mm_context.h

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it's x86-only and we have no business playing with it in asm/mmu.h; make
the latter have
	struct uml_arch_mm_context arch;
instead of
	struct uml_ldt ldt;
and let arch/<subarch>/um/asm/mm_context.h decide what'll be in there.
While we are at it, kill host_ldt.h - it's not needed in part of places
that include it (we want asm/ldt.h in those) and it can be trivially
expanded into the single remaining one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro
2011-08-18 20:10:49 +01:00
committed by Richard Weinberger
parent f67aa2ffb7
commit b3ee571e58
6 changed files with 58 additions and 61 deletions
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36
arch/x86/um/ldt.c
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@@ -137,7 +137,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
{
int i, err = 0;
unsigned long size;
uml_ldt_t * ldt = &current->mm->context.ldt;
uml_ldt_t *ldt = &current->mm->context.arch.ldt;
if (!ldt->entry_count)
goto out;
@@ -205,7 +205,7 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
{
uml_ldt_t * ldt = &current->mm->context.ldt;
uml_ldt_t *ldt = &current->mm->context.arch.ldt;
struct mm_id * mm_idp = &current->mm->context.id;
int i, err;
struct user_desc ldt_info;
@@ -397,7 +397,7 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
if (!ptrace_ldt)
mutex_init(&new_mm->ldt.lock);
mutex_init(&new_mm->arch.ldt.lock);
if (!from_mm) {
memset(&desc, 0, sizeof(desc));
@@ -429,7 +429,7 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
break;
}
}
new_mm->ldt.entry_count = 0;
new_mm->arch.ldt.entry_count = 0;
goto out;
}
@@ -457,26 +457,26 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
* i.e., we have to use the stub for modify_ldt, which
* can't handle the big read buffer of up to 64kB.
*/
mutex_lock(&from_mm->ldt.lock);
if (from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->ldt.u.entries, from_mm->ldt.u.entries,
sizeof(new_mm->ldt.u.entries));
mutex_lock(&from_mm->arch.ldt.lock);
if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
sizeof(new_mm->arch.ldt.u.entries));
else {
i = from_mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-->0) {
page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
if (!page) {
err = -ENOMEM;
break;
}
new_mm->ldt.u.pages[i] =
new_mm->arch.ldt.u.pages[i] =
(struct ldt_entry *) page;
memcpy(new_mm->ldt.u.pages[i],
from_mm->ldt.u.pages[i], PAGE_SIZE);
memcpy(new_mm->arch.ldt.u.pages[i],
from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
}
}
new_mm->ldt.entry_count = from_mm->ldt.entry_count;
mutex_unlock(&from_mm->ldt.lock);
new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
mutex_unlock(&from_mm->arch.ldt.lock);
}
out:
@@ -488,12 +488,12 @@ void free_ldt(struct mm_context *mm)
{
int i;
if (!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES) {
i = mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
if (!ptrace_ldt && mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
i = mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-- > 0)
free_page((long) mm->ldt.u.pages[i]);
free_page((long) mm->arch.ldt.u.pages[i]);
}
mm->ldt.entry_count = 0;
mm->arch.ldt.entry_count = 0;
}
int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)