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authorJeff Dike <jdike@addtoit.com>2008-02-04 22:30:51 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:27 -0800
commitb8bec829c90d45a2d115a52f3a928ce841afc3d4 (patch)
tree3e14d986c5e8491c62c2a41bc26ae8f5e6b6142a /arch/um/sys-i386
parent6b7e967484f4197d799e14b844b78118e93192c6 (diff)
uml: host TLS diagnostics
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>
Diffstat (limited to 'arch/um/sys-i386')
-rw-r--r--arch/um/sys-i386/tls.c30
1 files changed, 21 insertions, 9 deletions
diff --git a/arch/um/sys-i386/tls.c b/arch/um/sys-i386/tls.c
index f29b8a8fc1e..c6c7131e563 100644
--- a/arch/um/sys-i386/tls.c
+++ b/arch/um/sys-i386/tls.c
@@ -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");