[PATCH] uml: eliminate anonymous union and clean up symlink lossage

This gives a name to the anonymous union introduced in skas-hold-own-ldt,
allowing to build on a wider range of gccs.

It also removes ldt.h, which somehow became real, and replaces it with a
symlink, and creates ldt-x86_64.h as a copy of ldt-i386.h for now.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 22 insertions, 24 deletions

diff --git a/arch/um/Makefile b/arch/um/Makefile
index e55d32e903bc..1b12feeba368 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -17,7 +17,7 @@ core-y			+= $(ARCH_DIR)/kernel/		\
 
 # Have to precede the include because the included Makefiles reference them.
 SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
-        module.h vm-flags.h elf.h
+        module.h vm-flags.h elf.h ldt.h
 SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
 
 # XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index 6360f1c958d0..17746b4c08ff 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -228,7 +228,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
                 size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES;
                 if(size > bytecount)
                         size = bytecount;
-                if(copy_to_user(ptr, ldt->entries, size))
+                if(copy_to_user(ptr, ldt->u.entries, size))
                         err = -EFAULT;
                 bytecount -= size;
                 ptr += size;
@@ -239,7 +239,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
                         size = PAGE_SIZE;
                         if(size > bytecount)
                                 size = bytecount;
-                        if(copy_to_user(ptr, ldt->pages[i], size)){
+                        if(copy_to_user(ptr, ldt->u.pages[i], size)){
                                 err = -EFAULT;
                                 break;
                         }
@@ -321,10 +321,11 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
                     i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
                     i++){
                         if(i == 0)
-                                memcpy(&entry0, ldt->entries, sizeof(entry0));
-                        ldt->pages[i] = (struct ldt_entry *)
-                                        __get_free_page(GFP_KERNEL|__GFP_ZERO);
-                        if(!ldt->pages[i]){
+                                memcpy(&entry0, ldt->u.entries,
+                                       sizeof(entry0));
+                        ldt->u.pages[i] = (struct ldt_entry *)
+                                __get_free_page(GFP_KERNEL|__GFP_ZERO);
+                        if(!ldt->u.pages[i]){
                                 err = -ENOMEM;
                                 /* Undo the change in host */
                                 memset(&ldt_info, 0, sizeof(ldt_info));
@@ -332,8 +333,9 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
                                 goto out_unlock;
                         }
                         if(i == 0) {
-                                memcpy(ldt->pages[0], &entry0, sizeof(entry0));
-                                memcpy(ldt->pages[0]+1, ldt->entries+1,
+                                memcpy(ldt->u.pages[0], &entry0,
+                                       sizeof(entry0));
+                                memcpy(ldt->u.pages[0]+1, ldt->u.entries+1,
                                        sizeof(entry0)*(LDT_DIRECT_ENTRIES-1));
                         }
                         ldt->entry_count = (i + 1) * LDT_ENTRIES_PER_PAGE;
@@ -343,9 +345,9 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
                 ldt->entry_count = ldt_info.entry_number + 1;
 
         if(ldt->entry_count <= LDT_DIRECT_ENTRIES)
-                ldt_p = ldt->entries + ldt_info.entry_number;
+                ldt_p = ldt->u.entries + ldt_info.entry_number;
         else
-                ldt_p = ldt->pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] +
+                ldt_p = ldt->u.pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] +
                         ldt_info.entry_number%LDT_ENTRIES_PER_PAGE;
 
         if(ldt_info.base_addr == 0 && ldt_info.limit == 0 &&
@@ -501,8 +503,8 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
                  */
                 down(&from_mm->ldt.semaphore);
                 if(from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES){
-                        memcpy(new_mm->ldt.entries, from_mm->ldt.entries,
-                               sizeof(new_mm->ldt.entries));
+                        memcpy(new_mm->ldt.u.entries, from_mm->ldt.u.entries,
+                               sizeof(new_mm->ldt.u.entries));
                 }
                 else{
                         i = from_mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
@@ -512,9 +514,10 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
                                         err = -ENOMEM;
                                         break;
                                 }
-                                new_mm->ldt.pages[i] = (struct ldt_entry*)page;
-                                memcpy(new_mm->ldt.pages[i],
-                                       from_mm->ldt.pages[i], PAGE_SIZE);
+                                new_mm->ldt.u.pages[i] =
+                                        (struct ldt_entry *) page;
+                                memcpy(new_mm->ldt.u.pages[i],
+                                       from_mm->ldt.u.pages[i], PAGE_SIZE);
                         }
                 }
                 new_mm->ldt.entry_count = from_mm->ldt.entry_count;
@@ -532,7 +535,7 @@ void free_ldt(struct mmu_context_skas * mm)
         if(!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES){
                 i = mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
                 while(i-- > 0){
-                        free_page((long )mm->ldt.pages[i]);
+                        free_page((long )mm->ldt.u.pages[i]);
                 }
         }
         mm->ldt.entry_count = 0;
diff --git a/include/asm-um/ldt-i386.h b/include/asm-um/ldt-i386.h
index b42662929b6c..175722a91164 100644
--- a/include/asm-um/ldt-i386.h
+++ b/include/asm-um/ldt-i386.h
@@ -35,7 +35,7 @@ typedef struct uml_ldt {
         union {
                 struct ldt_entry * pages[LDT_PAGES_MAX];
                 struct ldt_entry entries[LDT_DIRECT_ENTRIES];
-        };
+        } u;
 } uml_ldt_t;
 
 /*
diff --git a/include/asm-um/ldt.h b/include/asm-um/ldt-x86_64.h
index 4466ff6de0fd..175722a91164 100644
--- a/include/asm-um/ldt.h
+++ b/include/asm-um/ldt-x86_64.h
@@ -35,7 +35,7 @@ typedef struct uml_ldt {
         union {
                 struct ldt_entry * pages[LDT_PAGES_MAX];
                 struct ldt_entry entries[LDT_DIRECT_ENTRIES];
-        };
+        } u;
 } uml_ldt_t;
 
 /*
@@ -67,8 +67,3 @@ typedef struct uml_ldt {
         (info)->useable         == 0    )
 
 #endif
-#ifndef __UM_LDT_H
-#define __UM_LDT_H
-
-#include "asm/arch/ldt.h"
-#endif