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authorJeff Dike <jdike@addtoit.com>2007-05-06 14:51:48 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:13:04 -0700
commit16dd07bc6404c8da0bdfeb7a5cde4e4a63991c00 (patch)
treede8401aeebfe1bbdaecaff3b81d92196c50c85d7 /arch/um/kernel/skas
parent3ec704e6660aa58505110a50102e57cdb9daa044 (diff)
uml: more page fault path trimming
More trimming of the page fault path. Permissions are passed around in a single int rather than one bit per int. The permission values are copied from libc so that they can be passed to mmap and mprotect without any further conversion. The register sets used by do_syscall_stub and copy_context_skas0 are initialized once, at boot time, rather than once per call. wait_stub_done checks whether it is getting the signals it expects by comparing the wait status to a mask containing bits for the signals of interest rather than comparing individually to the signal numbers. It also has one check for a wait failure instead of two. The caller is expected to do the initial continue of the stub. This gets rid of an argument and some logic. The fname argument is gone, as that can be had from a stack trace. user_signal() is collapsed into userspace() as it is basically one or two lines of code afterwards. The physical memory remapping stuff is gone, as it is unused. flush_tlb_page is inlined. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/kernel/skas')
-rw-r--r--arch/um/kernel/skas/tlb.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
index c43901aa936..b3d722ddde3 100644
--- a/arch/um/kernel/skas/tlb.c
+++ b/arch/um/kernel/skas/tlb.c
@@ -27,9 +27,9 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
switch(op->type){
case MMAP:
ret = map(&mmu->skas.id, op->u.mmap.addr,
- op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
- op->u.mmap.x, op->u.mmap.fd,
- op->u.mmap.offset, finished, flush);
+ op->u.mmap.len, op->u.mmap.prot,
+ op->u.mmap.fd, op->u.mmap.offset, finished,
+ flush);
break;
case MUNMAP:
ret = unmap(&mmu->skas.id, op->u.munmap.addr,
@@ -37,8 +37,7 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
break;
case MPROTECT:
ret = protect(&mmu->skas.id, op->u.mprotect.addr,
- op->u.mprotect.len, op->u.mprotect.r,
- op->u.mprotect.w, op->u.mprotect.x,
+ op->u.mprotect.len, op->u.mprotect.prot,
finished, flush);
break;
default:
@@ -102,10 +101,10 @@ void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
pte_t *pte;
struct mm_struct *mm = vma->vm_mm;
void *flush = NULL;
- int r, w, x, err = 0;
+ int r, w, x, prot, err = 0;
struct mm_id *mm_id;
- pgd = pgd_offset(vma->vm_mm, address);
+ pgd = pgd_offset(mm, address);
if(!pgd_present(*pgd))
goto kill;
@@ -130,19 +129,21 @@ void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
}
mm_id = &mm->context.skas.id;
+ prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+ (x ? UM_PROT_EXEC : 0));
if(pte_newpage(*pte)){
if(pte_present(*pte)){
unsigned long long offset;
int fd;
fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
- err = map(mm_id, address, PAGE_SIZE, r, w, x, fd,
- offset, 1, &flush);
+ err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+ 1, &flush);
}
else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
}
else if(pte_newprot(*pte))
- err = protect(mm_id, address, PAGE_SIZE, r, w, x, 1, &flush);
+ err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
if(err)
goto kill;