http://bugzilla.kernel.org/show_bug.cgi?id=11743
Summary: Defined but not used variable:
'acpi_mcfg_64bit_base_addr'
Product: ACPI
Version: 2.5
KernelVersion: 2.6.27
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: low
Priority: P1
Component: Config-Processors
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version: 2.6.27
Earliest failing kernel version: 2.6.27
Distribution: SuSE 10.3
Hardware Environment: Opteron 265, 4Gb ECC RAM, 1Tb HDD, Nforce4 chipset
Software Environment: gcc-4.3.1, glibc-2.6.1
Problem Description: warning: 'acpi_mcfg_64bit_base_addr' defined but not used
Steps to reproduce:
1. Configure kernel without MMCONFIG support and compile.
2. make
....
arch/x86/kernel/acpi/boot.c:100: warning: 'acpi_mcfg_64bit_base_addr' defined
but not used
....
Comment:
acpi_mcfg_64bit_base_addr defined on line 100 in arch/x86/kernel/acpi/boot.c
as "static int acpi_mcfg_64bit_base_addr __initdata = FALSE;"
But used only in functions in same file boot.c:
acpi_mcfg_oem_check() on line 166
and in acpi_parse_mcfg() on line 208
And this functions work only if CONFIG_PCI_MMCONFIG true, inside
#ifdef CONFIG_PCI_MMCONFIG
...
...
#endif
Solution:
--- patch version 1
################################################################
--- a/arch/x86/kernel/acpi/boot.c 2008-10-10 02:13:53.000000000 +0400
+++ b/arch/x86/kernel/acpi/boot.c 2008-10-12 03:13:16.888033920 +0400
@@ -97,7 +97,9 @@
#warning ACPI uses CMPXCHG, i486 and later hardware
#endif
+#ifdef CONFIG_PCI_MMCONFIG
static int acpi_mcfg_64bit_base_addr __initdata = FALSE;
+#endif
/* --------------------------------------------------------------------------
Boot-time Configuration
###############################################################
or patch version 2
################################################################################
--- a/arch/x86/kernel/acpi/boot.c 2008-10-10 02:13:53.000000000 +0400
+++ b/arch/x86/kernel/acpi/boot.c 2008-10-12 03:35:18.992034200 +0400
@@ -97,7 +97,6 @@
#warning ACPI uses CMPXCHG, i486 and later hardware
#endif
-static int acpi_mcfg_64bit_base_addr __initdata = FALSE;
/* --------------------------------------------------------------------------
Boot-time Configuration
@@ -156,6 +155,9 @@
}
#ifdef CONFIG_PCI_MMCONFIG
+
+static int acpi_mcfg_64bit_base_addr __initdata = FALSE;
+
/* The physical address of the MMCONFIG aperture. Set from ACPI tables. */
struct acpi_mcfg_allocation *pci_mmcfg_config;
int pci_mmcfg_config_num;
#############################################################################
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