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authorJeff Dike <jdike@addtoit.com>2005-11-21 21:32:10 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-22 09:13:41 -0800
commitaa1a64ee12ae130706f3fc0007841ce9b0ddf9c2 (patch)
treeaa4dcbb8d1870209ae69dc85f241b8c1592ee4c1 /arch/um/kernel/skas
parent17d469715c6453e4994e6617e8f644bf10f38584 (diff)
[PATCH] uml: eliminate use of libc PAGE_SIZE
On some systems, libc PAGE_SIZE calls getpagesize, which can't happen from a stub. So, I use UM_KERN_PAGE_SIZE, which is less variable in its definition, instead. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/kernel/skas')
-rw-r--r--arch/um/kernel/skas/clone.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
index 39c0d7145d3..cb37ce9124a 100644
--- a/arch/um/kernel/skas/clone.c
+++ b/arch/um/kernel/skas/clone.c
@@ -9,9 +9,13 @@
#include "stub-data.h"
#include "uml-config.h"
#include "sysdep/stub.h"
+#include "kern_constants.h"
/* This is in a separate file because it needs to be compiled with any
* extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
+ *
+ * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
+ * on some systems.
*/
#define STUB_DATA(field) (((struct stub_data *) UML_CONFIG_STUB_DATA)->field)
@@ -22,7 +26,7 @@ stub_clone_handler(void)
long err;
err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
- UML_CONFIG_STUB_DATA + PAGE_SIZE / 2 -
+ UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE / 2 -
sizeof(void *));
if(err != 0)
goto out;
@@ -36,9 +40,10 @@ stub_clone_handler(void)
if(err)
goto out;
- err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA, PAGE_SIZE,
- PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED,
- STUB_DATA(fd), STUB_DATA(offset));
+ err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA,
+ UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_FIXED | MAP_SHARED, STUB_DATA(fd),
+ STUB_DATA(offset));
out:
/* save current result. Parent: pid; child: retcode of mmap */
STUB_DATA(err) = err;