The patch titled
machine_kexec.c: Fix the description of segment handling
has been added to the -mm tree. Its filename is
machine_kexecc-fix-the-description-of-segment-handling.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: machine_kexec.c: Fix the description of segment handling
From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
One of my original comments in machine_kexec was unclear
and this should fix it.
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Acked-by: Horms <horms@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/machine_kexec.c | 13 +++++--------
arch/x86_64/kernel/machine_kexec.c | 13 +++++--------
2 files changed, 10 insertions(+), 16 deletions(-)
diff -puN arch/i386/kernel/machine_kexec.c~machine_kexecc-fix-the-description-of-segment-handling arch/i386/kernel/machine_kexec.c
--- a/arch/i386/kernel/machine_kexec.c~machine_kexecc-fix-the-description-of-segment-handling
+++ a/arch/i386/kernel/machine_kexec.c
@@ -189,14 +189,11 @@ NORET_TYPE void machine_kexec(struct kim
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
- /* The segment registers are funny things, they are
- * automatically loaded from a table, in memory wherever you
- * set them to a specific selector, but this table is never
- * accessed again you set the segment to a different selector.
- *
- * The more common model is are caches where the behide
- * the scenes work is done, but is also dropped at arbitrary
- * times.
+ /* The segment registers are funny things, they have both a
+ * visible and an invisible part. Whenever the visible part is
+ * set to a specific selector, the invisible part is loaded
+ * with from a table in memory. At no other time is the
+ * descriptor table in memory accessed.
*
* I take advantage of this here by force loading the
* segments, before I zap the gdt with an invalid value.
diff -puN arch/x86_64/kernel/machine_kexec.c~machine_kexecc-fix-the-description-of-segment-handling arch/x86_64/kernel/machine_kexec.c
--- a/arch/x86_64/kernel/machine_kexec.c~machine_kexecc-fix-the-description-of-segment-handling
+++ a/arch/x86_64/kernel/machine_kexec.c
@@ -207,14 +207,11 @@ NORET_TYPE void machine_kexec(struct kim
__flush_tlb();
- /* The segment registers are funny things, they are
- * automatically loaded from a table, in memory wherever you
- * set them to a specific selector, but this table is never
- * accessed again unless you set the segment to a different selector.
- *
- * The more common model are caches where the behide
- * the scenes work is done, but is also dropped at arbitrary
- * times.
+ /* The segment registers are funny things, they have both a
+ * visible and an invisible part. Whenever the visible part is
+ * set to a specific selector, the invisible part is loaded
+ * with from a table in memory. At no other time is the
+ * descriptor table in memory accessed.
*
* I take advantage of this here by force loading the
* segments, before I zap the gdt with an invalid value.
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxx are
machine_kexecc-fix-the-description-of-segment-handling.patch
msi-use-kmem_cache_zalloc.patch
sysctl-allow-proc-sys-without-sys_sysctl.patch
sysctl-scream-if-someone-uses-sys_sysctl.patch
sysctl-document-that-sys_sysctl-will-be-removed.patch
pid-implement-transfer_pid-and-use-it-to-simplify-de_thread.patch
pid-remove-temporary-debug-code-in-attach_pid.patch
de_thread-use-tsk-not-current.patch
stack-overflow-safe-kdump-safe_smp_processor_id.patch
stack-overflow-safe-kdump-safe_smp_processor_id_voyager.patch
stack-overflow-safe-kdump-crash_use_safe_smp_processor_id.patch
stack-overflow-safe-kdump-crash_use_safe_smp_processor_id-fix.patch
stack-overflow-safe-kdump-safe_smp_send_nmi_allbutself.patch
proc-sysctl-add-_proc_do_string-helper.patch
namespaces-add-nsproxy.patch
namespaces-add-nsproxy-dont-include-compileh.patch
namespaces-incorporate-fs-namespace-into-nsproxy.patch
namespaces-utsname-introduce-temporary-helpers.patch
namespaces-utsname-switch-to-using-uts-namespaces.patch
namespaces-utsname-use-init_utsname-when-appropriate.patch
namespaces-utsname-implement-utsname-namespaces.patch
namespaces-utsname-sysctl-hack.patch
namespaces-utsname-remove-system_utsname.patch
namespaces-utsname-implement-clone_newuts-flag.patch
uts-copy-nsproxy-only-when-needed.patch
ipc-namespace-core.patch
ipc-namespace-utils.patch
genirq-irq-convert-the-move_irq-flag-from-a-32bit-word-to-a-single-bit.patch
genirq-irq-add-moved_masked_irq.patch
genirq-x86_64-irq-reenable-migrating-irqs-to-other-cpus.patch
genirq-msi-simplify-msi-enable-and-disable.patch
genirq-msi-make-the-msi-boolean-tests-return-either-0-or-1.patch
genirq-msi-implement-helper-functions-read_msi_msg-and-write_msi_msg.patch
genirq-msi-refactor-the-msi_ops.patch
genirq-msi-simplify-the-msi-irq-limit-policy.patch
genirq-irq-add-a-dynamic-irq-creation-api.patch
genirq-ia64-irq-dynamic-irq-support.patch
genirq-i386-irq-dynamic-irq-support.patch
genirq-x86_64-irq-dynamic-irq-support.patch
genirq-msi-make-the-msi-code-irq-based-and-not-vector-based.patch
genirq-x86_64-irq-move-msi-message-composition-into-io_apicc.patch
genirq-i386-irq-move-msi-message-composition-into-io_apicc.patch
genirq-msi-only-build-msi-apicc-on-ia64.patch
genirq-msi-only-build-msi-apicc-on-ia64-fix.patch
genirq-x86_64-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-irq-remove-msi-hacks.patch
genirq-irq-generalize-the-check-for-hardirq_bits.patch
genirq-x86_64-irq-make-the-external-irq-handlers-report-their-vector-not-the-irq-number.patch
genirq-x86_64-irq-make-vector_irq-per-cpu.patch
genirq-x86_64-irq-kill-gsi_irq_sharing.patch
genirq-x86_64-irq-kill-irq-compression.patch
add-hypertransport-capability-defines.patch
add-hypertransport-capability-defines-fix.patch
initial-generic-hypertransport-interrupt-support.patch
initial-generic-hypertransport-interrupt-support-Kconfig-fix.patch
pidhash-temporary-debug-checks.patch
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