leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

uml: host TLS diagnostics

Browse Source 
Add some diagnostics when TLS operations on the host fail.  Also spit out more
information about the TLS environment on the host at boot time.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:30:51 -08:00 committed by Linus Torvalds
parent 6b7e967484
commit b8bec829c9
1 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
arch/um/sys-i386/tls.c
View File

@ -26,6 +26,11 @@ int do_set_thread_area(struct user_desc *info)
cpu = get_cpu();
ret = os_set_thread_area(info, userspace_pid[cpu]);
put_cpu();
if (ret)
printk(KERN_ERR "PTRACE_SET_THREAD_AREA failed, err = %d, "
"index = %d\n", ret, info->entry_number);
return ret;
}
@ -37,6 +42,11 @@ int do_get_thread_area(struct user_desc *info)
cpu = get_cpu();
ret = os_get_thread_area(info, userspace_pid[cpu]);
put_cpu();
if (ret)
printk(KERN_ERR "PTRACE_GET_THREAD_AREA failed, err = %d, "
"index = %d\n", ret, info->entry_number);
return ret;
}
@ -356,10 +366,9 @@ out:
return ret;
}
/*
* XXX: This part is probably common to i386 and x86-64. Don't create a common
* file for now, do that when implementing x86-64 support.
* This code is really i386-only, but it detects and logs x86_64 GDT indexes
* if a 32-bit UML is running on a 64-bit host.
*/
static int __init __setup_host_supports_tls(void)
{
@ -368,13 +377,16 @@ static int __init __setup_host_supports_tls(void)
printk(KERN_INFO "Host TLS support detected\n");
printk(KERN_INFO "Detected host type: ");
switch (host_gdt_entry_tls_min) {
case GDT_ENTRY_TLS_MIN_I386:
printk("i386\n");
break;
case GDT_ENTRY_TLS_MIN_X86_64:
printk("x86_64\n");
break;
case GDT_ENTRY_TLS_MIN_I386:
printk(KERN_CONT "i386");
break;
case GDT_ENTRY_TLS_MIN_X86_64:
printk(KERN_CONT "x86_64");
break;
}
printk(KERN_CONT " (GDT indexes %d to %d)\n",
host_gdt_entry_tls_min,
host_gdt_entry_tls_min + GDT_ENTRY_TLS_ENTRIES);
} else
printk(KERN_ERR " Host TLS support NOT detected! "
"TLS support inside UML will not work\n");