Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1d1497e1f9ffe2f7198c916abd112226a7a503f2
Commit:     1d1497e1f9ffe2f7198c916abd112226a7a503f2
Parent:     377fad3acbb7e94ab9942a74e0d9ede8eeb2f039
Author:     Jeff Dike <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 14:51:26 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon May 7 12:13:02 2007 -0700

    uml: comment early boot locking
    
    Commentary about missing locking.
    
    Also got rid of uml_start because it was pointless.
    
    Signed-off-by: Jeff Dike <[EMAIL PROTECTED]>
    Cc: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 arch/um/kernel/um_arch.c |   22 +++++++++++++---------
 1 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index cfa3576..9bf3153 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -44,7 +44,7 @@
 
 #define DEFAULT_COMMAND_LINE "root=98:0"
 
-/* Changed in linux_main and setup_arch, which run before SMP is started */
+/* Changed in add_arg and setup_arch, which run before SMP is started */
 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
 
 static void __init add_arg(char *arg)
@@ -58,7 +58,12 @@ static void __init add_arg(char *arg)
        strcat(command_line, arg);
 }
 
-struct cpuinfo_um boot_cpu_data = { 
+/*
+ * These fields are initialized at boot time and not changed.
+ * XXX This structure is used only in the non-SMP case.  Maybe this
+ * should be moved to smp.c.
+ */
+struct cpuinfo_um boot_cpu_data = {
        .loops_per_jiffy        = 0,
        .ipi_pipe               = { -1, -1 }
 };
@@ -119,14 +124,12 @@ const struct seq_operations cpuinfo_op = {
 /* Set in linux_main */
 unsigned long host_task_size;
 unsigned long task_size;
-
-unsigned long uml_start;
-
-/* Set in early boot */
 unsigned long uml_physmem;
-unsigned long uml_reserved;
+unsigned long uml_reserved; /* Also modified in mem_init */
 unsigned long start_vm;
 unsigned long end_vm;
+
+/* Set in uml_ncpus_setup */
 int ncpus = 1;
 
 #ifdef CONFIG_CMDLINE_ON_HOST
@@ -140,6 +143,8 @@ static char *argv1_end = NULL;
 
 /* Set in early boot */
 static int have_root __initdata = 0;
+
+/* Set in uml_mem_setup and modified in linux_main */
 long long physmem_size = 32 * 1024 * 1024;
 
 void set_cmdline(char *cmd)
@@ -378,7 +383,6 @@ int __init linux_main(int argc, char **argv)
 
        printf("UML running in %s mode\n", mode);
 
-       uml_start = (unsigned long) &__binary_start;
        host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
                                          set_task_sizes_skas, &task_size);
 
@@ -400,7 +404,7 @@ int __init linux_main(int argc, char **argv)
                physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
        }
 
-       uml_physmem = uml_start & PAGE_MASK;
+       uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
 
        /* Reserve up to 4M after the current brk */
        uml_reserved = ROUND_4M(brk_start) + (1 << 22);
-
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