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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[PATCH] PCI: Reduce nr of ptr derefs in drivers/pci/hotplug/cpqphp_core.c
Here's a small patch to reduce the nr of pointer dereferences in drivers/pci/hotplug/cpqphp_core.c Benefits of this patch: - micro speed optimization due to fewer pointer derefs - generated code is slightly smaller - tiny line length and whitespace cleanup - better readability Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jesper Juhl
Greg Kroah-Hartman
parent
5d135dff53
commit
efbf62e9f4
@ -327,7 +327,9 @@ static int ctrl_slot_setup(struct controller *ctrl,
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void __iomem *smbios_start,
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void __iomem *smbios_table)
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{
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struct slot *new_slot;
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struct slot *slot;
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struct hotplug_slot *hotplug_slot;
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struct hotplug_slot_info *hotplug_slot_info;
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u8 number_of_slots;
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u8 slot_device;
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u8 slot_number;
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@ -345,93 +347,105 @@ static int ctrl_slot_setup(struct controller *ctrl,
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slot_number = ctrl->first_slot;
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while (number_of_slots) {
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new_slot = kmalloc(sizeof(*new_slot), GFP_KERNEL);
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if (!new_slot)
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slot = kmalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot)
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goto error;
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memset(new_slot, 0, sizeof(struct slot));
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new_slot->hotplug_slot = kmalloc(sizeof(*(new_slot->hotplug_slot)),
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memset(slot, 0, sizeof(struct slot));
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slot->hotplug_slot = kmalloc(sizeof(*(slot->hotplug_slot)),
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GFP_KERNEL);
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if (!new_slot->hotplug_slot)
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if (!slot->hotplug_slot)
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goto error_slot;
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memset(new_slot->hotplug_slot, 0, sizeof(struct hotplug_slot));
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hotplug_slot = slot->hotplug_slot;
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memset(hotplug_slot, 0, sizeof(struct hotplug_slot));
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new_slot->hotplug_slot->info =
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kmalloc(sizeof(*(new_slot->hotplug_slot->info)),
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hotplug_slot->info =
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kmalloc(sizeof(*(hotplug_slot->info)),
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GFP_KERNEL);
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if (!new_slot->hotplug_slot->info)
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if (!hotplug_slot->info)
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goto error_hpslot;
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memset(new_slot->hotplug_slot->info, 0,
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hotplug_slot_info = hotplug_slot->info;
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memset(hotplug_slot_info, 0,
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sizeof(struct hotplug_slot_info));
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new_slot->hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
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if (!new_slot->hotplug_slot->name)
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hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
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if (!hotplug_slot->name)
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goto error_info;
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new_slot->ctrl = ctrl;
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new_slot->bus = ctrl->bus;
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new_slot->device = slot_device;
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new_slot->number = slot_number;
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dbg("slot->number = %d\n",new_slot->number);
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slot->ctrl = ctrl;
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slot->bus = ctrl->bus;
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slot->device = slot_device;
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slot->number = slot_number;
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dbg("slot->number = %d\n", slot->number);
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slot_entry = get_SMBIOS_entry(smbios_start, smbios_table, 9,
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slot_entry);
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while (slot_entry && (readw(slot_entry + SMBIOS_SLOT_NUMBER) != new_slot->number)) {
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while (slot_entry && (readw(slot_entry + SMBIOS_SLOT_NUMBER) !=
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slot->number)) {
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slot_entry = get_SMBIOS_entry(smbios_start,
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smbios_table, 9, slot_entry);
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}
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new_slot->p_sm_slot = slot_entry;
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slot->p_sm_slot = slot_entry;
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init_timer(&new_slot->task_event);
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new_slot->task_event.expires = jiffies + 5 * HZ;
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new_slot->task_event.function = cpqhp_pushbutton_thread;
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init_timer(&slot->task_event);
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slot->task_event.expires = jiffies + 5 * HZ;
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slot->task_event.function = cpqhp_pushbutton_thread;
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//FIXME: these capabilities aren't used but if they are
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// they need to be correctly implemented
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new_slot->capabilities |= PCISLOT_REPLACE_SUPPORTED;
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new_slot->capabilities |= PCISLOT_INTERLOCK_SUPPORTED;
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slot->capabilities |= PCISLOT_REPLACE_SUPPORTED;
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slot->capabilities |= PCISLOT_INTERLOCK_SUPPORTED;
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if (is_slot64bit(new_slot))
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new_slot->capabilities |= PCISLOT_64_BIT_SUPPORTED;
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if (is_slot66mhz(new_slot))
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new_slot->capabilities |= PCISLOT_66_MHZ_SUPPORTED;
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if (is_slot64bit(slot))
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slot->capabilities |= PCISLOT_64_BIT_SUPPORTED;
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if (is_slot66mhz(slot))
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slot->capabilities |= PCISLOT_66_MHZ_SUPPORTED;
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if (ctrl->speed == PCI_SPEED_66MHz)
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new_slot->capabilities |= PCISLOT_66_MHZ_OPERATION;
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slot->capabilities |= PCISLOT_66_MHZ_OPERATION;
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ctrl_slot = slot_device - (readb(ctrl->hpc_reg + SLOT_MASK) >> 4);
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ctrl_slot =
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slot_device - (readb(ctrl->hpc_reg + SLOT_MASK) >> 4);
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// Check presence
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new_slot->capabilities |= ((((~tempdword) >> 23) | ((~tempdword) >> 15)) >> ctrl_slot) & 0x02;
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slot->capabilities |=
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((((~tempdword) >> 23) |
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((~tempdword) >> 15)) >> ctrl_slot) & 0x02;
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// Check the switch state
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new_slot->capabilities |= ((~tempdword & 0xFF) >> ctrl_slot) & 0x01;
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slot->capabilities |=
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((~tempdword & 0xFF) >> ctrl_slot) & 0x01;
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// Check the slot enable
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new_slot->capabilities |= ((read_slot_enable(ctrl) << 2) >> ctrl_slot) & 0x04;
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slot->capabilities |=
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((read_slot_enable(ctrl) << 2) >> ctrl_slot) & 0x04;
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/* register this slot with the hotplug pci core */
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new_slot->hotplug_slot->release = &release_slot;
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new_slot->hotplug_slot->private = new_slot;
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make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
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new_slot->hotplug_slot->ops = &cpqphp_hotplug_slot_ops;
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hotplug_slot->release = &release_slot;
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hotplug_slot->private = slot;
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make_slot_name(hotplug_slot->name, SLOT_NAME_SIZE, slot);
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hotplug_slot->ops = &cpqphp_hotplug_slot_ops;
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new_slot->hotplug_slot->info->power_status = get_slot_enabled(ctrl, new_slot);
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new_slot->hotplug_slot->info->attention_status = cpq_get_attention_status(ctrl, new_slot);
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new_slot->hotplug_slot->info->latch_status = cpq_get_latch_status(ctrl, new_slot);
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new_slot->hotplug_slot->info->adapter_status = get_presence_status(ctrl, new_slot);
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hotplug_slot_info->power_status = get_slot_enabled(ctrl, slot);
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hotplug_slot_info->attention_status =
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cpq_get_attention_status(ctrl, slot);
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hotplug_slot_info->latch_status =
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cpq_get_latch_status(ctrl, slot);
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hotplug_slot_info->adapter_status =
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get_presence_status(ctrl, slot);
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dbg ("registering bus %d, dev %d, number %d, "
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dbg("registering bus %d, dev %d, number %d, "
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"ctrl->slot_device_offset %d, slot %d\n",
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new_slot->bus, new_slot->device,
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new_slot->number, ctrl->slot_device_offset,
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slot->bus, slot->device,
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slot->number, ctrl->slot_device_offset,
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slot_number);
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result = pci_hp_register (new_slot->hotplug_slot);
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result = pci_hp_register(hotplug_slot);
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if (result) {
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err ("pci_hp_register failed with error %d\n", result);
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err("pci_hp_register failed with error %d\n", result);
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goto error_name;
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}
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new_slot->next = ctrl->slot;
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ctrl->slot = new_slot;
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slot->next = ctrl->slot;
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ctrl->slot = slot;
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number_of_slots--;
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slot_device++;
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@ -439,15 +453,14 @@ static int ctrl_slot_setup(struct controller *ctrl,
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}
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return 0;
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error_name:
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kfree(new_slot->hotplug_slot->name);
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kfree(hotplug_slot->name);
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error_info:
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kfree(new_slot->hotplug_slot->info);
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kfree(hotplug_slot_info);
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error_hpslot:
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kfree(new_slot->hotplug_slot);
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kfree(hotplug_slot);
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error_slot:
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kfree(new_slot);
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kfree(slot);
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error:
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return result;
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}
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