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Diffstat (limited to 'arch/x86_64/kernel/machine_kexec.c')
-rw-r--r--arch/x86_64/kernel/machine_kexec.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/arch/x86_64/kernel/machine_kexec.c b/arch/x86_64/kernel/machine_kexec.c
index 83fb24a02821..106076b370fc 100644
--- a/arch/x86_64/kernel/machine_kexec.c
+++ b/arch/x86_64/kernel/machine_kexec.c
@@ -207,14 +207,11 @@ NORET_TYPE void machine_kexec(struct kimage *image)
207 __flush_tlb(); 207 __flush_tlb();
208 208
209 209
210 /* The segment registers are funny things, they are 210 /* The segment registers are funny things, they have both a
211 * automatically loaded from a table, in memory wherever you 211 * visible and an invisible part. Whenever the visible part is
212 * set them to a specific selector, but this table is never 212 * set to a specific selector, the invisible part is loaded
213 * accessed again unless you set the segment to a different selector. 213 * with from a table in memory. At no other time is the
214 * 214 * descriptor table in memory accessed.
215 * The more common model are caches where the behide
216 * the scenes work is done, but is also dropped at arbitrary
217 * times.
218 * 215 *
219 * I take advantage of this here by force loading the 216 * I take advantage of this here by force loading the
220 * segments, before I zap the gdt with an invalid value. 217 * segments, before I zap the gdt with an invalid value.