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Message-ID: <20070612164806.GA7517@c2.user-mode-linux.org>
Date: Tue, 12 Jun 2007 12:48:06 -0400
From: Jeff Dike <jdike@...toit.com>
To: Andrew Morton <akpm@...l.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 1/2] UML - Remove PAGE_SIZE from libc code
Distros seem to be removing PAGE_SIZE from asm/page.h. So, the libc
side of UML should stop using it.
I replace it with UM_KERN_PAGE_SIZE, which is defined to be the same
as PAGE_SIZE on the kernel side of the house. I could also use
getpagesize(), but it's more important that UML have the same value of
PAGE_SIZE everywhere. It's conceivable that it could be built with a
larger PAGE_SIZE, and use of getpagesize() would break that badly.
PAGE_MASK got the same treatment, as it is closely tied to PAGE_SIZE.
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
arch/um/include/common-offsets.h | 1 +
arch/um/os-Linux/main.c | 4 +++-
arch/um/os-Linux/skas/mem.c | 13 +++++++------
arch/um/os-Linux/skas/process.c | 13 +++++++------
arch/um/os-Linux/start_up.c | 7 ++++---
5 files changed, 22 insertions(+), 16 deletions(-)
Index: linux-2.6.21-mm/arch/um/os-Linux/main.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/main.c 2007-06-06 09:28:13.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/main.c 2007-06-12 11:33:37.000000000 -0400
@@ -24,6 +24,7 @@
#include "uml-config.h"
#include "os.h"
#include "um_malloc.h"
+#include "kern_constants.h"
/* Set in main, unchanged thereafter */
char *linux_prog;
@@ -232,7 +233,8 @@ void *__wrap_malloc(int size)
if(!CAN_KMALLOC())
return __real_malloc(size);
- else if(size <= PAGE_SIZE) /* finding contiguos pages can be hard*/
+ else if(size <= UM_KERN_PAGE_SIZE)
+ /* finding contiguous pages can be hard*/
ret = um_kmalloc(size);
else ret = um_vmalloc(size);
Index: linux-2.6.21-mm/arch/um/os-Linux/skas/mem.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/skas/mem.c 2007-06-06 09:28:13.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/skas/mem.c 2007-06-12 11:34:37.000000000 -0400
@@ -25,6 +25,7 @@
#include "sysdep/ptrace.h"
#include "sysdep/stub.h"
#include "init.h"
+#include "kern_constants.h"
extern unsigned long batch_syscall_stub, __syscall_stub_start;
@@ -149,8 +150,8 @@ long run_syscall_stub(struct mm_id * mm_
*stack = 0;
multi_op_count++;
- if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
- PAGE_SIZE - 10 * sizeof(long))){
+ if(!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
+ UM_KERN_PAGE_SIZE - 10 * sizeof(long))){
*addr = stack;
return 0;
}
@@ -168,8 +169,8 @@ long syscall_stub_data(struct mm_id * mm
/* If *addr still is uninitialized, it *must* contain NULL.
* Thus in this case do_syscall_stub correctly won't be called.
*/
- if((((unsigned long) *addr) & ~PAGE_MASK) >=
- PAGE_SIZE - (10 + data_count) * sizeof(long)) {
+ if((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
+ UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
ret = do_syscall_stub(mm_idp, addr);
/* in case of error, don't overwrite data on stack */
if(ret)
@@ -183,8 +184,8 @@ long syscall_stub_data(struct mm_id * mm
memcpy(stack + 1, data, data_count * sizeof(long));
- *stub_addr = (void *)(((unsigned long)(stack + 1) & ~PAGE_MASK) +
- UML_CONFIG_STUB_DATA);
+ *stub_addr = (void *)(((unsigned long)(stack + 1) &
+ ~UM_KERN_PAGE_MASK) + UML_CONFIG_STUB_DATA);
return 0;
}
Index: linux-2.6.21-mm/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/skas/process.c 2007-06-06 09:28:13.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/skas/process.c 2007-06-12 11:31:14.000000000 -0400
@@ -252,11 +252,12 @@ int start_userspace(unsigned long stub_s
unsigned long sp;
int pid, status, n, flags;
- stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+ stack = mmap(NULL, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if(stack == MAP_FAILED)
panic("start_userspace : mmap failed, errno = %d", errno);
- sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+ sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
flags = CLONE_FILES | SIGCHLD;
if(proc_mm) flags |= CLONE_VM;
@@ -279,7 +280,7 @@ int start_userspace(unsigned long stub_s
panic("start_userspace : PTRACE_OLDSETOPTIONS failed, errno=%d\n",
errno);
- if(munmap(stack, PAGE_SIZE) < 0)
+ if(munmap(stack, UM_KERN_PAGE_SIZE) < 0)
panic("start_userspace : munmap failed, errno = %d\n", errno);
return(pid);
@@ -365,7 +366,7 @@ static int __init init_thread_regs(void)
thread_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
(unsigned long) stub_clone_handler -
(unsigned long) &__syscall_stub_start;
- thread_regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
+ thread_regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE -
sizeof(void *);
#ifdef __SIGNAL_FRAMESIZE
thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
@@ -453,7 +454,7 @@ void map_stub_pages(int fd, unsigned lon
.u =
{ .mmap =
{ .addr = code,
- .len = PAGE_SIZE,
+ .len = UM_KERN_PAGE_SIZE,
.prot = PROT_EXEC,
.flags = MAP_FIXED | MAP_PRIVATE,
.fd = code_fd,
@@ -476,7 +477,7 @@ void map_stub_pages(int fd, unsigned lon
.u =
{ .mmap =
{ .addr = data,
- .len = PAGE_SIZE,
+ .len = UM_KERN_PAGE_SIZE,
.prot = PROT_READ | PROT_WRITE,
.flags = MAP_FIXED | MAP_SHARED,
.fd = map_fd,
Index: linux-2.6.21-mm/arch/um/os-Linux/start_up.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/start_up.c 2007-06-06 09:28:13.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/start_up.c 2007-06-12 11:32:18.000000000 -0400
@@ -107,11 +107,12 @@ static int start_ptraced_child(void **st
unsigned long sp;
int pid, n, status;
- stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+ stack = mmap(NULL, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if(stack == MAP_FAILED)
fatal_perror("check_ptrace : mmap failed");
- sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+ sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
if(pid < 0)
fatal_perror("start_ptraced_child : clone failed");
@@ -153,7 +154,7 @@ static int stop_ptraced_child(int pid, v
ret = -1;
}
- if(munmap(stack, PAGE_SIZE) < 0)
+ if(munmap(stack, UM_KERN_PAGE_SIZE) < 0)
fatal_perror("check_ptrace : munmap failed");
return ret;
}
Index: linux-2.6.21-mm/arch/um/include/common-offsets.h
===================================================================
--- linux-2.6.21-mm.orig/arch/um/include/common-offsets.h 2007-06-06 09:28:13.000000000 -0400
+++ linux-2.6.21-mm/arch/um/include/common-offsets.h 2007-06-12 11:35:22.000000000 -0400
@@ -9,6 +9,7 @@ OFFSET(HOST_TASK_REGS, task_struct, thre
OFFSET(HOST_TASK_PID, task_struct, pid);
DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
+DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
DEFINE_STR(UM_KERN_EMERG, KERN_EMERG);
-
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