linux-kernel - [PATCH 2/6] UML - Use UM_THREAD

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Date:	Wed, 9 May 2007 16:27:20 -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 2/6] UML - Use UM_THREAD_SIZE in userspace code

Now that we have UM_THREAD_SIZE, we can replace the calculations in
user-space code (an earlier patch took care of the kernel side of the
house).

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
 arch/um/kernel/init_task.c      |    3 +--
 arch/um/os-Linux/skas/process.c |    7 +++----
 2 files changed, 4 insertions(+), 6 deletions(-)

Index: linux-2.6.21-mm/arch/um/kernel/init_task.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/kernel/init_task.c	2007-05-07 15:01:10.000000000 -0400
+++ linux-2.6.21-mm/arch/um/kernel/init_task.c	2007-05-08 10:06:07.000000000 -0400
@@ -44,8 +44,7 @@ __attribute__((__section__(".data.init_t
 
 void unprotect_stack(unsigned long stack)
 {
-	os_protect_memory((void *) stack, (1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE,
-		       1, 1, 0);
+	os_protect_memory((void *) stack, THREAD_SIZE, 1, 1, 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	2007-05-07 15:35:31.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/skas/process.c	2007-05-08 10:06:07.000000000 -0400
@@ -490,8 +490,8 @@ void map_stub_pages(int fd, unsigned lon
 void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
 {
 	(*buf)[0].JB_IP = (unsigned long) handler;
-	(*buf)[0].JB_SP = (unsigned long) stack +
-		(PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) - sizeof(void *);
+	(*buf)[0].JB_SP = (unsigned long) stack + UM_THREAD_SIZE -
+		sizeof(void *);
 }
 
 #define INIT_JMP_NEW_THREAD 0
@@ -533,8 +533,7 @@ int start_idle_thread(void *stack, jmp_b
 	case INIT_JMP_NEW_THREAD:
 		(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
 		(*switch_buf)[0].JB_SP = (unsigned long) stack +
-			(PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) -
-			sizeof(void *);
+			UM_THREAD_SIZE - sizeof(void *);
 		break;
 	case INIT_JMP_CALLBACK:
 		(*cb_proc)(cb_arg);
-
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