The patch titled
Remove the WARN_ON() in arch/x86_64/kernel/acpi/sleep.c:init_low_mapping()
has been added to the -mm tree. Its filename is
remove-the-warn_on-in-arch-x86_64-kernel-acpi-sleepcinit_low_mapping.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Remove the WARN_ON() in arch/x86_64/kernel/acpi/sleep.c:init_low_mapping()
From: "Rafael J. Wysocki" <rjw@xxxxxxx>
Remove the WARN_ON() in arch/x86_64/kernel/acpi/sleep.c:init_low_mapping(),
which triggers every time during the suspend to disk in the platform mode, as
the potential problem it is related to doesn't seem to occur in practice.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Adrian Bunk <bunk@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86_64/kernel/acpi/sleep.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/acpi/sleep.c~remove-the-warn_on-in-arch-x86_64-kernel-acpi-sleepcinit_low_mapping arch/x86_64/kernel/acpi/sleep.c
--- a/arch/x86_64/kernel/acpi/sleep.c~remove-the-warn_on-in-arch-x86_64-kernel-acpi-sleepcinit_low_mapping
+++ a/arch/x86_64/kernel/acpi/sleep.c
@@ -66,8 +66,10 @@ static void init_low_mapping(void)
{
pgd_t *slot0 = pgd_offset(current->mm, 0UL);
low_ptr = *slot0;
+ /* FIXME: We're playing with the current task's page tables here, which
+ * is potentially dangerous on SMP systems.
+ */
set_pgd(slot0, *pgd_offset(current->mm, PAGE_OFFSET));
- WARN_ON(num_online_cpus() != 1);
local_flush_tlb();
}
_
Patches currently in -mm which might be from rjw@xxxxxxx are
remove-the-warn_on-in-arch-x86_64-kernel-acpi-sleepcinit_low_mapping.patch
fix-refrigerator-vs-thaw_process-race.patch
swsusp-use-inline-functions-for-changing-page-flags.patch
swsusp-do-not-use-page-flags.patch
mm-remove-unused-page-flags.patch
swsusp-fix-error-paths-in-snapshot_open.patch
swsusp-use-gfp_kernel-for-creating-basic-data-structures.patch
rework-pm_ops-pm_disk_mode-kill-misuse.patch
power-management-remove-firmware-disk-mode.patch
power-management-implement-pm_opsvalid-for-everybody.patch
power-management-force-pm_opsvalid-callback-to-be.patch
freezer-task-exit_state-should-be-treated-as-bolean.patch
documentation-ask-driver-writers-to-provide-pm-support.patch
freezer-read-pf_borrowed_mm-in-a-nonracy-way.patch
freezer-close-theoretical-race-between-refrigerator-and-thaw_tasks.patch
freezer-remove-pf_nofreeze-from-rcutorture-thread.patch
freezer-remove-pf_nofreeze-from-bluetooth-threads.patch
freezer-add-try_to_freeze-calls-to-all-kernel-threads.patch
freezer-fix-vfork-problem.patch
freezer-take-kernel_execve-into-consideration.patch
shrink_slab-handle-bad-shrinkers.patch
-
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