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Date: Tue, 28 Dec 2010 14:48:42 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] apic: use GFP_ATOMIC in lapic_resume
sysdev .suspend/.resume is invoked with irq disabled,
GFP_ATOMIC should be used in lapic_resume.
Without this patch, I got the following warning messages after resume.
[ 109.780371] BUG: sleeping function called from invalid context at mm/slub.c:793
[ 109.780782] in_atomic(): 0, irqs_disabled(): 1, pid: 1391, name: bash
[ 109.781024] Pid: 1391, comm: bash Not tainted 2.6.37-rc5+ #182
[ 109.781264] Call Trace:
[ 109.781501] [<ffffffff8104156a>] __might_sleep+0xeb/0xf0
[ 109.781743] [<ffffffff8110d5e2>] slab_pre_alloc_hook.clone.33+0x28/0x31
[ 109.781987] [<ffffffff8110dcef>] __kmalloc+0x88/0x115
[ 109.782224] [<ffffffff81025e4a>] ? kzalloc.clone.19+0x13/0x15
[ 109.782465] [<ffffffff81025e4a>] kzalloc.clone.19+0x13/0x15
[ 109.782704] [<ffffffff81025ff0>] alloc_ioapic_entries+0x20/0x82
[ 109.782948] [<ffffffff81024201>] lapic_resume+0x3a/0x245
[ 109.783189] [<ffffffff813a8329>] ? cpufreq_resume+0x30/0xb0
[ 109.783431] [<ffffffff812ec4ee>] __sysdev_resume+0x25/0xc5
[ 109.783673] [<ffffffff812ec644>] sysdev_resume+0xb6/0xfb
[ 109.783914] [<ffffffff81083256>] suspend_devices_and_enter+0x13c/0x1c1
[ 109.784159] [<ffffffff810833b8>] enter_state+0xdd/0x12e
[ 109.784398] [<ffffffff81082a61>] state_store+0xae/0xcb
[ 109.784640] [<ffffffff81225737>] kobj_attr_store+0x17/0x19
[ 109.784882] [<ffffffff81173311>] sysfs_write_file+0x114/0x150
[ 109.785124] [<ffffffff8111aebb>] vfs_write+0xac/0xff
[ 109.785365] [<ffffffff8111b0c2>] sys_write+0x4a/0x6e
[ 109.785604] [<ffffffff8100ac82>] system_call_fastpath+0x16/0x1b
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
arch/x86/include/asm/io_apic.h | 2 +-
arch/x86/kernel/apic/apic.c | 4 ++--
arch/x86/kernel/apic/io_apic.c | 7 +++----
3 files changed, 6 insertions(+), 7 deletions(-)
Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -589,20 +589,19 @@ static int __init ioapic_pirq_setup(char
__setup("pirq=", ioapic_pirq_setup);
#endif /* CONFIG_X86_32 */
-struct IO_APIC_route_entry **alloc_ioapic_entries(void)
+struct IO_APIC_route_entry **alloc_ioapic_entries(gfp_t flags)
{
int apic;
struct IO_APIC_route_entry **ioapic_entries;
- ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics,
- GFP_KERNEL);
+ ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics, flags);
if (!ioapic_entries)
return 0;
for (apic = 0; apic < nr_ioapics; apic++) {
ioapic_entries[apic] =
kzalloc(sizeof(struct IO_APIC_route_entry) *
- nr_ioapic_registers[apic], GFP_KERNEL);
+ nr_ioapic_registers[apic], flags);
if (!ioapic_entries[apic])
goto nomem;
}
Index: linux-2.6/arch/x86/include/asm/io_apic.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/io_apic.h
+++ linux-2.6/arch/x86/include/asm/io_apic.h
@@ -162,7 +162,7 @@ void setup_IO_APIC_irq_extra(u32 gsi);
extern void ioapic_init_mappings(void);
extern void ioapic_insert_resources(void);
-extern struct IO_APIC_route_entry **alloc_ioapic_entries(void);
+extern struct IO_APIC_route_entry **alloc_ioapic_entries(gfp_t flags);
extern void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries);
extern int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
extern void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
Index: linux-2.6/arch/x86/kernel/apic/apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/apic.c
+++ linux-2.6/arch/x86/kernel/apic/apic.c
@@ -1459,7 +1459,7 @@ void __init enable_IR_x2apic(void)
if (dmar_table_init_ret && !x2apic_supported())
return;
- ioapic_entries = alloc_ioapic_entries();
+ ioapic_entries = alloc_ioapic_entries(GFP_KERNEL);
if (!ioapic_entries) {
pr_err("Allocate ioapic_entries failed\n");
goto out;
@@ -2084,7 +2084,7 @@ static int lapic_resume(struct sys_devic
local_irq_save(flags);
if (intr_remapping_enabled) {
- ioapic_entries = alloc_ioapic_entries();
+ ioapic_entries = alloc_ioapic_entries(GFP_ATOMIC);
if (!ioapic_entries) {
WARN(1, "Alloc ioapic_entries in lapic resume failed.");
ret = -ENOMEM;
--
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