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authorDave Airlie <airlied@redhat.com>2010-09-24 15:37:33 +1000
committerDave Airlie <airlied@redhat.com>2010-09-24 15:37:33 +1000
commit4a445f291ac3faa08f56eaeb6e44856b6b72b74c (patch)
treeb66cc93311dc4c623113a87aa9b40730a21ac18e /arch/x86/lguest/boot.c
parentcbc60ca04b342a4e1f2a1086a7277c077f07dbed (diff)
parenta850ea30374ebed32a0724742601861853fde869 (diff)
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Merge remote branch 'origin/master' of /home/airlied/kernel//linux-2.6 into drm-core-next
Diffstat (limited to 'arch/x86/lguest/boot.c')
-rw-r--r--arch/x86/lguest/boot.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 9257510..9d5f558 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -324,9 +324,8 @@ static void lguest_load_gdt(const struct desc_ptr *desc)
}
/*
- * For a single GDT entry which changes, we do the lazy thing: alter our GDT,
- * then tell the Host to reload the entire thing. This operation is so rare
- * that this naive implementation is reasonable.
+ * For a single GDT entry which changes, we simply change our copy and
+ * then tell the host about it.
*/
static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum,
const void *desc, int type)
@@ -338,9 +337,13 @@ static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum,
}
/*
- * OK, I lied. There are three "thread local storage" GDT entries which change
+ * There are three "thread local storage" GDT entries which change
* on every context switch (these three entries are how glibc implements
- * __thread variables). So we have a hypercall specifically for this case.
+ * __thread variables). As an optimization, we have a hypercall
+ * specifically for this case.
+ *
+ * Wouldn't it be nicer to have a general LOAD_GDT_ENTRIES hypercall
+ * which took a range of entries?
*/
static void lguest_load_tls(struct thread_struct *t, unsigned int cpu)
{