2.6.25-rc5: WARNING: at arch/x86/mm/ioremap.c

2.6.25-rc5: WARNING: at arch/x86/mm/ioremap.c

[Phil Oester]

Still getting the 'WARNING: at arch/x86/mm/ioremap.c:137 __ioremap+0xb1/0x165()'
error in -rc5.  Seen a few threads on this error, but apparently still not
resolved.  Anyone need more info?

Phil


ACPI: EC: Look up EC in DSDT
------------[ cut here ]------------
WARNING: at arch/x86/mm/ioremap.c:137 __ioremap+0xb1/0x165()
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.25-rc5 #1
 [<c0110dbf>] warn_on_slowpath+0x40/0x4f
 [<c01bac1e>] acpi_ut_update_object_reference+0xb0/0x109
 [<c01b37a1>] acpi_ns_lookup+0x205/0x2ea
 [<c01bb684>] acpi_ut_release_mutex+0x50/0x55
 [<c01b4a86>] acpi_ns_get_node+0x79/0x83
 [<c0213089>] raw_pci_read+0x3d/0x45
 [<c01bb746>] acpi_ut_acquire_mutex+0x2e/0x64
 [<c01bb684>] acpi_ut_release_mutex+0x50/0x55
 [<c01b569f>] acpi_get_parent+0x63/0x6c
 [<c0213089>] raw_pci_read+0x3d/0x45
 [<c010c88e>] __ioremap+0xb1/0x165
 [<c01b181d>] acpi_ex_system_memory_space_handler+0xdd/0x210
 [<c01b1740>] acpi_ex_system_memory_space_handler+0x0/0x210
 [<c01aafdc>] acpi_ev_address_space_dispatch+0x127/0x168
 [<c01aeb6e>] acpi_ex_access_region+0x1a5/0x1b7
 [<c01aec8b>] acpi_ex_field_datum_io+0x10b/0x193
 [<c01b3b66>] acpi_ns_search_one_scope+0x12/0x37
 [<c01b3c83>] acpi_ns_search_and_enter+0xf8/0x159
 [<c01aedab>] acpi_ex_extract_from_field+0x98/0x221
 [<c01bb32b>] acpi_ut_allocate_object_desc_dbg+0x29/0x58
 [<c01bb36f>] acpi_ut_create_internal_object_dbg+0x15/0x67
 [<c01ad7f4>] acpi_ex_read_data_from_field+0x108/0x136
 [<c01b249d>] acpi_ex_resolve_node_to_value+0x145/0x1c0
 [<c01ae37e>] acpi_ex_resolve_to_value+0x202/0x20c
 [<c01b0277>] acpi_ex_resolve_operands+0x1e1/0x4aa
 [<c01a89fd>] acpi_ds_exec_end_op+0xa7/0x3ae
 [<c01b685e>] acpi_ps_parse_loop+0x546/0x6f8
 [<c01b5d37>] acpi_ps_parse_aml+0x5f/0x222
 [<c01b6ee7>] acpi_ps_execute_method+0x10a/0x1a7
 [<c01b4464>] acpi_ns_evaluate+0x90/0xe4
 [<c01b4fbd>] acpi_ns_init_one_device+0x72/0xad
 [<c01b5494>] acpi_ns_walk_namespace+0x94/0x114
 [<c01b4f18>] acpi_ns_initialize_devices+0x80/0xb3
 [<c01b4f4b>] acpi_ns_init_one_device+0x0/0xad
 [<c01ba392>] acpi_initialize_objects+0x28/0x3a
 [<c03172f9>] acpi_init+0x77/0x21f
 [<c030b5fa>] kernel_init+0x97/0x1d1
 [<c010e921>] schedule_tail+0xe/0x39
 [<c0102772>] ret_from_fork+0x6/0x1c
 [<c030b563>] kernel_init+0x0/0x1d1
 [<c030b563>] kernel_init+0x0/0x1d1
 [<c01033b7>] kernel_thread_helper+0x7/0x10
 =======================
---[ end trace ca143223eefdc828 ]---
ACPI: Interpreter enabled

Re: 2.6.25-rc5: WARNING: at arch/x86/mm/ioremap.c

[Ingo Molnar]

* Phil Oester <kernel@linuxace.com> wrote:

> Still getting the 'WARNING: at arch/x86/mm/ioremap.c:137 
> __ioremap+0xb1/0x165()' error in -rc5.  Seen a few threads on this 
> error, but apparently still not resolved.  Anyone need more info?

the warning is harmless and will be removed in the next x86 update. 
(patch is queued up in x86.git already, see below.)

	Ingo

-------------->
Subject: x86: ioremap, remove WARN_ON()
From: Ingo Molnar <mingo@elte.hu>
Date: Tue Feb 26 09:30:32 CET 2008

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/mm/ioremap.c |    2 --
 1 file changed, 2 deletions(-)

Index: linux-x86.q/arch/x86/mm/ioremap.c
===================================================================
--- linux-x86.q.orig/arch/x86/mm/ioremap.c
+++ linux-x86.q/arch/x86/mm/ioremap.c
@@ -134,8 +134,6 @@ static void __iomem *__ioremap(unsigned 
 			return NULL;
 	}
 
-	WARN_ON_ONCE(page_is_ram(pfn));
-
 	switch (mode) {
 	case IOR_MODE_UNCACHED:
 	default: