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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 /include/asm-um
parent3ec704e6660aa58505110a50102e57cdb9daa044 (diff)
downloadop-kernel-dev-16dd07bc6404c8da0bdfeb7a5cde4e4a63991c00.zip
op-kernel-dev-16dd07bc6404c8da0bdfeb7a5cde4e4a63991c00.tar.gz
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 'include/asm-um')
-rw-r--r--include/asm-um/page.h3
-rw-r--r--include/asm-um/tlbflush.h24
2 files changed, 13 insertions, 14 deletions
diff --git a/include/asm-um/page.h b/include/asm-um/page.h
index 4296d31..8e310d8 100644
--- a/include/asm-um/page.h
+++ b/include/asm-um/page.h
@@ -114,9 +114,6 @@ extern unsigned long uml_physmem;
extern struct page *arch_validate(struct page *page, gfp_t mask, int order);
#define HAVE_ARCH_VALIDATE
-extern void arch_free_page(struct page *page, int order);
-#define HAVE_ARCH_FREE_PAGE
-
#include <asm-generic/memory_model.h>
#include <asm-generic/page.h>
diff --git a/include/asm-um/tlbflush.h b/include/asm-um/tlbflush.h
index 522aa30..e78c28c 100644
--- a/include/asm-um/tlbflush.h
+++ b/include/asm-um/tlbflush.h
@@ -7,6 +7,7 @@
#define __UM_TLBFLUSH_H
#include <linux/mm.h>
+#include "choose-mode.h"
/*
* TLB flushing:
@@ -24,6 +25,18 @@ extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end);
+extern void flush_tlb_page_skas(struct vm_area_struct *vma,
+ unsigned long address);
+
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+ unsigned long address)
+{
+ address &= PAGE_MASK;
+
+ CHOOSE_MODE(flush_tlb_range(vma, address, address + PAGE_SIZE),
+ flush_tlb_page_skas(vma, address));
+}
+
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
extern void flush_tlb_kernel_vm(void);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
@@ -35,14 +48,3 @@ static inline void flush_tlb_pgtables(struct mm_struct *mm,
}
#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
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