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[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>
This commit is contained in:
Jeff Dike 2005-11-21 21:32:10 -08:00 committed by Linus Torvalds
parent 17d469715c
commit aa1a64ee12
1 changed files with 9 additions and 4 deletions
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13
arch/um/kernel/skas/clone.c
View File

@ -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;