Messages in this thread Patch in this message | | | Date | Tue, 22 Feb 2011 08:35:29 +0000 | From | "Jan Beulich" <> | Subject | [PATCH, v2] x86/PCI: don't export a __devinit function |
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Exporting a __devinit function (pcibios_scan_specific_bus()) isn't correct. (Michal, any reason why modpost only warns about exported __init functions?) Short of being able to think of a better solution, and short of making the whole call tree (reaching into the arch- independent part of the PCI subsystem) non-__devinit, export the symbol only when HOTPLUG is enabled (which is always the case for non- expert configurations), use section mismatch avoidance annotations for that case (knowing that __devinit functions will not be discarded), and mark the symbol __devinit only in the !HOTPLUG case.
Consequently, EDAC_I7CORE's use of that function then has to depend on CONFIG_HOTPLUG. A fundamental question of course if whether this driver has to use that function in the first place (i.e. whether it wouldn't be better to just remove the export) - the problem it tries to address happens on other systems too, but the PCI bus the devices in question live on isn't necessarily bus 255. For the affected system I have, the alternative approach is to set pcibios_last_bus from __pci_mmcfg_init() based on the highest bus number on segment 0 being covered by MCFG.
v2: Rather than making the whole i7core_edac driver depend on HOTPLUG, make only the code using the symbol in question depend on this option (unless built into the kernel).
Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: Aristeu Sergio <arozansk@redhat.com> Cc: Michal Marek <mmarek@suse.cz>
--- arch/x86/pci/legacy.c | 21 ++++++++++++++++++--- drivers/edac/i7core_edac.c | 6 ++++++ 2 files changed, 24 insertions(+), 3 deletions(-)
--- 2.6.38-rc6/arch/x86/pci/legacy.c +++ 2.6.38-rc6-x86-pci-section-conflict/arch/x86/pci/legacy.c @@ -36,7 +36,23 @@ int __init pci_legacy_init(void) return 0; } -void __devinit pcibios_scan_specific_bus(int busn) +#ifdef CONFIG_HOTPLUG +static void __ref +#else +static inline void +#endif +_pci_scan_bus_on_node(int busno, int node) +{ + pci_scan_bus_on_node(busno, &pci_root_ops, node); +} + +#ifdef CONFIG_HOTPLUG +EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus); +void +#else +void __devinit +#endif +pcibios_scan_specific_bus(int busn) { int devfn; long node; @@ -51,12 +67,11 @@ void __devinit pcibios_scan_specific_bus l != 0x0000 && l != 0xffff) { DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l); printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn); - pci_scan_bus_on_node(busn, &pci_root_ops, node); + _pci_scan_bus_on_node(busn, node); return; } } } -EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus); int __init pci_subsys_init(void) { --- 2.6.38-rc6/drivers/edac/i7core_edac.c +++ 2.6.38-rc6-x86-pci-section-conflict/drivers/edac/i7core_edac.c @@ -1267,6 +1267,11 @@ static void i7core_put_all_devices(void) static void __init i7core_xeon_pci_fixup(const struct pci_id_table *table) { +/* + * pcibios_scan_specific_bus() is __devinit and thus only exported when + * CONFIG_HOTPLUG is defined. + */ +#if !defined(MODULE) || defined(CONFIG_HOTPLUG) struct pci_dev *pdev = NULL; int i; @@ -1284,6 +1289,7 @@ static void __init i7core_xeon_pci_fixup pci_dev_put(pdev); table++; } +#endif } static unsigned i7core_pci_lastbus(void)
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