Message-ID: <20090508070018.30e47919@pedra.chehab.org>
Date:	Fri, 8 May 2009 07:00:18 -0300
From:	Mauro Carvalho Chehab <mchehab@...hat.com>
To:	Borislav Petkov <borislav.petkov@....com>
Cc:	<akpm@...ux-foundation.org>, <greg@...ah.com>, <mingo@...e.hu>,
	<norsk5@...oo.com>, <tglx@...utronix.de>, <hpa@...or.com>,
	<aris@...hat.com>, edt@....ca, <linux-kernel@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 21/21] amd64_edac: add module registration routines

Em Thu, 7 May 2009 15:49:43 +0200
Borislav Petkov <borislav.petkov@....com> escreveu:

> From: Doug Thompson <dougthompson@...ssion.com>
> 
> Also, link into Kbuild by adding Kconfig and Makefile entries.
> 
> Borislav:
> - Kconfig/Makefile splitting
> - #ifdef sysfs attrs size based on CONFIG_ settings
> 
> Signed-off-by: Doug Thompson <dougthompson@...ssion.com>
> Signed-off-by: Borislav Petkov <borislav.petkov@....com>

I agree with Ingo about not needing to depend on NUMA. Anyway, the code seems ok to me.

Reviewed-by: Mauro Carvalho Chehab <mchehab@...hat.com>


> ---
>  drivers/edac/Kconfig          |   26 +++
>  drivers/edac/Makefile         |   13 +
>  drivers/edac/amd64_edac.c     |  485 +++++++++++++++++++++++++++++++++++++++++
>  drivers/edac/amd64_edac.h     |    5 +
>  drivers/edac/amd64_edac_dbg.c |    3 +
>  drivers/edac/amd64_edac_inj.c |    3 +
>  6 files changed, 535 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index e5f5c5a..e854de1 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -58,6 +58,32 @@ config EDAC_MM_EDAC
>  	  occurred so that a particular failing memory module can be
>  	  replaced.  If unsure, select 'Y'.
>  
> +config EDAC_AMD64_OPTERON
> +	tristate "AMD64 (Opteron, Athlon64) K8, F10h, F11h"
> +	depends on EDAC_MM_EDAC && X86 && PCI && NUMA
> +	help
> +	Support for error detection and correction on the AMD 64
> +	Families of Memory Controllers (K8, F10h and F11h)
> +
> +config EDAC_AMD64_OPTERON_ERROR_INJECTION
> +	bool "/sys Error Injection access"
> +	depends on EDAC_AMD64_OPTERON
> +	help
> +	  Recent Opterons (Family 10h and later) provide for Memory Error
> +	  Injection into the ECC detection circuits. The amd64_edac module
> +	  allows the operator/user to inject Uncorrectable and Correctable
> +	  errors into DRAM.
> +
> +	  When enabled, in each of the respective memory controller directories
> +	  (/sys/devices/system/edac/mc/mcX), there are 3 input files:
> +
> +	  - z_inject_section (0..3, 16-byte section of 64-byte cacheline),
> +	  - z_inject_word (0..8, 16-bit word of 16-byte section),
> +	  - z_inject_bit_map (hex bitmap vector: mask bits of 16 bit word to
> +	    error-out)
> +
> +	  In addition, there are two control files, z_inject_read and
> +	  z_inject_write, which trigger the Read and Write errors respectively.
>  
>  config EDAC_AMD76X
>  	tristate "AMD 76x (760, 762, 768)"
> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
> index a5fdcf0..d7424d4 100644
> --- a/drivers/edac/Makefile
> +++ b/drivers/edac/Makefile
> @@ -30,6 +30,19 @@ obj-$(CONFIG_EDAC_I3000)		+= i3000_edac.o
>  obj-$(CONFIG_EDAC_X38)			+= x38_edac.o
>  obj-$(CONFIG_EDAC_I82860)		+= i82860_edac.o
>  obj-$(CONFIG_EDAC_R82600)		+= r82600_edac.o
> +
> +amd64_edac_mod-y :=  amd64_edac_err_types.o amd64_edac.o
> +
> +ifeq ($(CONFIG_EDAC_DEBUG), y)
> +	amd64_edac_mod-y += amd64_edac_dbg.o
> +endif
> +
> +ifeq ($(CONFIG_EDAC_AMD64_OPTERON_ERROR_INJECTION), y)
> +	amd64_edac_mod-y += amd64_edac_inj.o
> +endif
> +
> +obj-$(CONFIG_EDAC_AMD64_OPTERON)	+= amd64_edac_mod.o
> +
>  obj-$(CONFIG_EDAC_PASEMI)		+= pasemi_edac.o
>  obj-$(CONFIG_EDAC_MPC85XX)		+= mpc85xx_edac.o
>  obj-$(CONFIG_EDAC_MV64X60)		+= mv64x60_edac.o
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index af6eafd..c99cb55 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -3272,3 +3272,488 @@ static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
>  	return rc;
>  }
>  
> +struct mcidev_sysfs_attribute sysfs_attrs[
> +#ifdef CONFIG_EDAC_DEBUG
> +ARRAY_SIZE(amd64_dbg_attrs) +
> +#endif
> +#ifdef CONFIG_EDAC_AMD64_OPTERON_ERROR_INJECTION
> +ARRAY_SIZE(amd64_inj_attrs) +
> +#endif
> +1];
> +
> +static void amd64_set_mc_sysfs_attributes(struct mem_ctl_info *mci)
> +{
> +	struct mcidev_sysfs_attribute terminator = { .attr = { .name = NULL } };
> +	unsigned int i = 0, uninitialized_var(j);
> +
> +#ifdef CONFIG_EDAC_DEBUG
> +	for (; i < ARRAY_SIZE(amd64_dbg_attrs); i++)
> +		sysfs_attrs[i] = amd64_dbg_attrs[i];
> +#endif
> +
> +#ifdef CONFIG_EDAC_AMD64_OPTERON_ERROR_INJECTION
> +	for (j = 0; j < ARRAY_SIZE(amd64_inj_attrs); j++, i++)
> +		sysfs_attrs[i] = amd64_inj_attrs[j];
> +#endif
> +
> +	sysfs_attrs[i] = terminator;
> +
> +	mci->mc_driver_sysfs_attributes = sysfs_attrs;
> +}
> +
> +/*
> + * amd64_setup_mci_misc_attributes
> + *
> + *	initialize various attributes of the mci structure
> + */
> +static void amd64_setup_mci_misc_attributes(struct mem_ctl_info *mci)
> +{
> +	struct amd64_pvt *pvt = mci->pvt_info;
> +
> +	/* Initialize various states */
> +	mci->mtype_cap = MEM_FLAG_DDR2 | MEM_FLAG_RDDR2;
> +	mci->edac_ctl_cap = EDAC_FLAG_NONE;
> +	mci->edac_cap = EDAC_FLAG_NONE;
> +
> +	/* Exam the capabilities of the northbridge in order to reflect them
> +	 * in the presentation via sysfs attributes, etc
> +	 */
> +	if (pvt->nbcap & K8_NBCAP_SECDED)
> +		mci->edac_ctl_cap |= EDAC_FLAG_SECDED;
> +
> +	if (pvt->nbcap & K8_NBCAP_CHIPKILL)
> +		mci->edac_ctl_cap |= EDAC_FLAG_S4ECD4ED;
> +
> +	/* What type of SECDED is there? */
> +	mci->edac_cap = amd64_determine_edac_cap(pvt);
> +
> +	/* Misc attributes to set */
> +	mci->mod_name = EDAC_MOD_STR;
> +	mci->mod_ver = EDAC_AMD64_VERSION;
> +	mci->ctl_name = get_amd_family_name(pvt->mc_type_index);
> +	mci->dev_name = pci_name(pvt->dram_f2_ctl);
> +	mci->ctl_page_to_phys = NULL;
> +
> +	/* IMPORTANT: Set the polling 'check' function in this module */
> +	mci->edac_check = amd64_check;
> +
> +	/* memory scrubber interface */
> +	mci->set_sdram_scrub_rate = amd64_set_scrub_rate;
> +	mci->get_sdram_scrub_rate = amd64_get_scrub_rate;
> +}
> +
> +/*
> + * amd64_probe_one_instance
> + *
> + *    probe function to determine if there is a DRAM Controller device is
> + *    present and to construct data tables for it.
> + *
> + *    Due to a hardware feature on Family 10H cpus, the Enable Extended
> + *    Configuration Space feature MUST be enabled on ALL Processors prior to
> + *    actually reading from the ECS registers. Since the loading of the module
> + *    can occur on any 'core', and cores don't 'see' all the other processors
> + *    ECS data when the others are NOT enabled. Our solution is to first
> + *    enable ECS access in this routine on all processors, gather some data in
> + *    a amd64_pvt structure and later come back in a 'finishup_setup' function
> + *    to perform that final initialization.
> + *
> + *    See also amd64_init_2nd_stage().
> + */
> +static int amd64_probe_one_instance(struct pci_dev *dram_f2_ctl,
> +					int mc_type_index)
> +{
> +	struct amd64_pvt *pvt;
> +	int err;
> +	int rc;
> +
> +	pvt = kzalloc(sizeof(struct amd64_pvt), GFP_KERNEL);
> +	if (pvt == NULL) {
> +		rc = -ENOMEM;
> +		goto exit_now;
> +	}
> +
> +	pvt->mc_node_id = get_mc_node_id_from_pdev(dram_f2_ctl);
> +
> +	debugf0("=========== %s(Instance= %d) ===========\n",
> +		__func__, pvt->mc_node_id);
> +
> +	pvt->dram_f2_ctl = dram_f2_ctl;
> +	pvt->ext_model = boot_cpu_data.x86_model >> 4;
> +	pvt->mc_type_index = mc_type_index;
> +	pvt->ops = get_amd_family_ops(mc_type_index);
> +	pvt->old_mcgctl = 0;
> +
> +	/*
> +	 * We have the dram_f2_ctl device as an argument, now go reserved its
> +	 * sibling devices from the PCI system.
> +	 */
> +	err = amd64_reserve_mc_sibling_devices(pvt, mc_type_index);
> +	if (err) {
> +		rc = -ENODEV;
> +		goto exit_now;
> +	}
> +
> +	rc = amd64_check_ecc_enabled(pvt);
> +	if (rc)
> +		goto exit_release_devices;
> +
> +	/*
> +	 * Key operation here: setup of HW prior to performing ops on it. Some
> +	 * setup is required to access ECS data. After this is performed, then
> +	 * the 'teardown' function must be called upon error and normal exit
> +	 * paths.
> +	 */
> +	if (boot_cpu_data.x86 > 0xf)
> +		amd64_setup(pvt);
> +
> +	/*
> +	 * Save the pointer to the private data for use in 2nd initialization
> +	 * stage
> +	 */
> +	pvt_lookup[pvt->mc_node_id] = pvt;
> +
> +	debugf0("%s(): init 1st stage done pvt-%d\n", __func__,
> +		pvt->mc_node_id);
> +	return 0;
> +
> +
> +exit_release_devices:
> +	pci_dev_put(pvt->addr_f1_ctl);
> +	pci_dev_put(pvt->misc_f3_ctl);
> +
> +exit_now:
> +	return rc;
> +}
> +
> +/*
> + * amd64_init_2nd_stage
> + *
> + *	this is the "finishing" up initialization code
> + *	Needs to be performed after all MCs' Hardware have been
> + *	"prep'ed" for accessing extended config space.
> + */
> +static int amd64_init_2nd_stage(struct amd64_pvt *pvt_temp)
> +{
> +	int node_id = pvt_temp->mc_node_id;
> +	struct mem_ctl_info *mci;
> +	struct amd64_pvt *pvt;
> +	int rc;
> +	int err;
> +
> +	debugf0("%s()\n", __func__);
> +
> +	amd64_read_mc_registers(pvt_temp);
> +
> +	/* Check hardware to see if this module can support HW at this time */
> +	if (pvt_temp->ops->probe_valid_hardware) {
> +		err = pvt_temp->ops->probe_valid_hardware(pvt_temp);
> +		if (err) {
> +			rc = -ENODEV;
> +			goto exit_failure;
> +		}
> +	}
> +
> +	/*
> +	 * We need to determine how many memory channels there are. Then use
> +	 * that information for calculating the size of the dynamic instance
> +	 * tables in the 'mci' structure
> +	 */
> +	pvt_temp->channel_count = pvt_temp->ops->early_channel_count(pvt_temp);
> +
> +	mci = edac_mc_alloc(sizeof(*pvt_temp),
> +				CHIPSELECT_COUNT,
> +				pvt_temp->channel_count,
> +				node_id);
> +	if (mci == NULL) {
> +		rc = -ENOMEM;
> +		goto exit_failure;
> +	}
> +
> +	/*
> +	 * transfer the info from the interium pvt area to the private area of
> +	 * the MC instance structure
> +	 */
> +	pvt = mci->pvt_info;
> +	*pvt = *pvt_temp;
> +
> +	mci->dev = &pvt_temp->dram_f2_ctl->dev;
> +	amd64_setup_mci_misc_attributes(mci);
> +
> +	if (amd64_init_csrows(mci)) {
> +		debugf1("Setting mci->edac_cap to EDAC_FLAG_NONE because\n");
> +		debugf1("   amd64_init_csrows() returned NO csrows found\n");
> +		mci->edac_cap = EDAC_FLAG_NONE;
> +	}
> +
> +	amd64_enable_ecc_error_reporting(mci);
> +	amd64_set_mc_sysfs_attributes(mci);
> +
> +	if (edac_mc_add_mc(mci)) {
> +		debugf1("%s(): failed edac_mc_add_mc()\n", __func__);
> +		rc = -ENODEV;
> +		goto exit_add_mc_failure;
> +	}
> +
> +	debugf0("%s(): init 2nd stage done mci%d\n", __func__,
> +		pvt->mc_node_id);
> +
> +	mci_lookup[node_id] = mci;
> +
> +	kfree(pvt_lookup[pvt->mc_node_id]);
> +	pvt_lookup[node_id] = NULL;
> +	return 0;
> +
> +exit_add_mc_failure:
> +	edac_mc_free(mci);
> +
> +exit_failure:
> +	debugf0("%s() failure init 2nd stage: rc=%d\n", __func__, rc);
> +
> +	amd64_restore_ecc_error_reporting(pvt);
> +
> +	if (boot_cpu_data.x86 > 0xf)
> +		amd64_teardown(pvt);
> +
> +	pci_dev_put(pvt->addr_f1_ctl);
> +	pci_dev_put(pvt->misc_f3_ctl);
> +
> +	kfree(pvt_lookup[pvt->mc_node_id]);
> +	pvt_lookup[node_id] = NULL;
> +
> +	return rc;
> +}
> +
> +
> +/*
> + * amd64_init_one_instance
> + *
> + *	initialize just one device
> + *
> + *	returns:
> + *		 count (>= 0), or
> + *		negative on error
> + */
> +static int __devinit amd64_init_one_instance(struct pci_dev *pdev,
> +				 const struct pci_device_id *mc_type)
> +{
> +	int rc;
> +
> +	debugf0("%s(MC node=%d,mc_type='%s')\n",
> +		__func__,
> +		get_mc_node_id_from_pdev(pdev),
> +		get_amd_family_name(mc_type->driver_data));
> +
> +	/* wake up and enable device */
> +	rc = pci_enable_device(pdev);
> +	if (rc < 0)
> +		rc = -EIO;
> +	else
> +		rc = amd64_probe_one_instance(pdev, mc_type->driver_data);
> +
> +	if (rc < 0)
> +		debugf0("%s() rc=%d\n", __func__, rc);
> +
> +	return rc;
> +}
> +
> +/*
> + * amd64_remove_one_instance
> + *
> + *	remove just one device instance upon driver unloading
> + */
> +static void __devexit amd64_remove_one_instance(struct pci_dev *pdev)
> +{
> +	struct mem_ctl_info *mci;
> +	struct amd64_pvt *pvt;
> +
> +	debugf0("%s()\n", __func__);
> +
> +	/* Remove from EDAC CORE tracking list */
> +	mci = edac_mc_del_mc(&pdev->dev);
> +	if (mci == NULL)
> +		return;
> +
> +	pvt = mci->pvt_info;
> +
> +	amd64_restore_ecc_error_reporting(pvt);
> +
> +	if (boot_cpu_data.x86 > 0xf)
> +		amd64_teardown(pvt);
> +
> +	pci_dev_put(pvt->addr_f1_ctl);
> +	pci_dev_put(pvt->misc_f3_ctl);
> +
> +	mci_lookup[pvt->mc_node_id] = NULL;
> +
> +	/* Free the EDAC CORE resources */
> +	edac_mc_free(mci);
> +}
> +
> +/*
> + * The 'pci_device_id' table.
> + *
> + *	This table is part of the interface for loading drivers for PCI
> + *	devices. The PCI core identifies what devices are on a system
> + *	during boot, and then inquiry this table to see if this driver
> + *	is for a given device found.
> + *
> + *	The PCI helpper functions walk this table and call the
> + *	'.probe' function of the 'pci_driver' table, for each
> + *	instance in this table
> + */
> +static const struct pci_device_id amd64_pci_table[] __devinitdata = {
> +	{
> +		/* Rev F and prior */
> +		.vendor = PCI_VENDOR_ID_AMD,
> +		.device = PCI_DEVICE_ID_AMD_K8_NB_MEMCTL,
> +		.subvendor = PCI_ANY_ID,
> +		.subdevice = PCI_ANY_ID,
> +		.class = 0,
> +		.class_mask = 0,
> +		.driver_data = K8_CPUS
> +	},
> +	{
> +		/* Family 10h */
> +		.vendor = PCI_VENDOR_ID_AMD,
> +		.device = PCI_DEVICE_ID_AMD_10H_NB_DRAM,
> +		.subvendor = PCI_ANY_ID,
> +		.subdevice = PCI_ANY_ID,
> +		.class = 0,
> +		.class_mask = 0,
> +		.driver_data = F10_CPUS
> +	},
> +	{
> +		/* Family 11h */
> +		.vendor = PCI_VENDOR_ID_AMD,
> +		.device = PCI_DEVICE_ID_AMD_11H_NB_DRAM,
> +		.subvendor = PCI_ANY_ID,
> +		.subdevice = PCI_ANY_ID,
> +		.class = 0,
> +		.class_mask = 0,
> +		.driver_data = F11_CPUS
> +	},
> +	{0, }
> +};
> +MODULE_DEVICE_TABLE(pci, amd64_pci_table);
> +
> +/*
> + * The 'pci_driver' structure to define the name, probe and removal
> + * functions
> + */
> +static struct pci_driver amd64_pci_driver = {
> +	.name = EDAC_MOD_STR,
> +	.probe = amd64_init_one_instance,
> +	.remove = __devexit_p(amd64_remove_one_instance),
> +	.id_table = amd64_pci_table,
> +};
> +
> +
> +/*
> + * amd64_setup_pci_device
> + *
> + *	setup the PCI Device Driver for monitoring PCI errors
> + */
> +static void amd64_setup_pci_device(void)
> +{
> +	struct mem_ctl_info *mci;
> +	struct amd64_pvt *pvt;
> +
> +	if (!amd64_ctl_pci) {
> +
> +		mci = mci_lookup[0];
> +		if (mci) {
> +			debugf1("%s(): Registering ONE PCI control\n",
> +				__func__);
> +
> +			pvt = mci->pvt_info;
> +			amd64_ctl_pci = edac_pci_create_generic_ctl(
> +						&pvt->dram_f2_ctl->dev,
> +						EDAC_MOD_STR);
> +			if (!amd64_ctl_pci) {
> +				printk(KERN_WARNING
> +					"%s(): Unable to create PCI control\n",
> +					__func__);
> +				printk(KERN_WARNING
> +					"%s(): PCI error report via EDAC "
> +					"not setup\n",
> +					__func__);
> +			}
> +		} else {
> +			debugf1("%s(): ONE PCI control already registered\n",
> +				__func__);
> +		}
> +	}
> +}
> +
> +static int __init amd64_edac_init(void)
> +{
> +	int err;
> +	int node;
> +
> +	edac_printk(KERN_INFO, EDAC_MOD_STR, EDAC_AMD64_VERSION "\n");
> +
> +	opstate_init();
> +
> +	debugf0("%s() ******************  ENTRY  **********************\n",
> +		__func__);
> +
> +	/* Attempt to register drivers for instances
> +	 * DUE to the failure of some 'cores' to access Extended Config Space
> +	 * prior to all memory controllers having their ECS register enabled,
> +	 * the initialization has been created into 2 stages. Here we
> +	 * call for the 1st stage. After all have been enabled, then we
> +	 * do the 2nd stage to finishup setup.
> +	 */
> +	err = pci_register_driver(&amd64_pci_driver);
> +
> +	/* At this point, the array 'pvt_lookup[]' contains pointers to
> +	 * allocated struct amd64_pvt control structures. These will be used
> +	 * in the 2nd stage init function to finish initialization of
> +	 * the MC instances.
> +	 */
> +
> +	/* if no error occurred on first pass init, then do 2nd pass init */
> +	if (!err) {
> +		for_each_online_node(node) {
> +			if (!pvt_lookup[node])
> +				continue;
> +
> +			/* If any failure then need to clean up */
> +			err = amd64_init_2nd_stage(pvt_lookup[node]);
> +			if (err) {
> +				debugf0("%s() 'finish_setup' stage failed\n",
> +					__func__);
> +
> +				/* undo prior instances' registrations
> +				 * and leave as failed
> +				 */
> +				pci_unregister_driver(&amd64_pci_driver);
> +				goto error_exit;
> +			}
> +		}
> +		amd64_setup_pci_device();
> +	}
> +
> +error_exit:
> +	return err;
> +}
> +
> +static void __exit amd64_edac_exit(void)
> +{
> +	if (amd64_ctl_pci)
> +		edac_pci_release_generic_ctl(amd64_ctl_pci);
> +
> +	pci_unregister_driver(&amd64_pci_driver);
> +}
> +
> +module_init(amd64_edac_init);
> +module_exit(amd64_edac_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("SoftwareBitMaker: Doug Thompson, "
> +		"Dave Peterson, Thayne Harbaugh");
> +MODULE_DESCRIPTION("MC support for AMD64 memory controllers - "
> +		EDAC_AMD64_VERSION);
> +
> +module_param(edac_op_state, int, 0444);
> +MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
> diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
> index d435ace..a3603f7 100644
> --- a/drivers/edac/amd64_edac.h
> +++ b/drivers/edac/amd64_edac.h
> @@ -891,6 +891,11 @@ extern const char *ii_msgs[4];
>  extern const char *ext_msgs[32];
>  extern const char *htlink_msgs[8];
>  
> +#define NUM_DBG_ATTRS  9
> +#define NUM_INJ_ATTRS  5
> +extern struct mcidev_sysfs_attribute amd64_dbg_attrs[NUM_DBG_ATTRS],
> +				     amd64_inj_attrs[NUM_INJ_ATTRS];
> +
>  /*
>   * Each of the PCI Device IDs types have their own set of hardware
>   * accessor function and per device encoding/decoding logic.
> diff --git a/drivers/edac/amd64_edac_dbg.c b/drivers/edac/amd64_edac_dbg.c
> index 3741af9..f538129 100644
> --- a/drivers/edac/amd64_edac_dbg.c
> +++ b/drivers/edac/amd64_edac_dbg.c
> @@ -211,6 +211,9 @@ static ssize_t amd64_hole_show(struct mem_ctl_info *mci, char *data)
>  						 hole_size);
>  }
>  
> +/*
> + * update NUM_DBG_ATTRS in case you add new members
> + */
>  struct mcidev_sysfs_attribute amd64_dbg_attrs[] = {
>  
>  	{
> diff --git a/drivers/edac/amd64_edac_inj.c b/drivers/edac/amd64_edac_inj.c
> index 7f978cb..8706954 100644
> --- a/drivers/edac/amd64_edac_inj.c
> +++ b/drivers/edac/amd64_edac_inj.c
> @@ -155,6 +155,9 @@ static ssize_t amd64_inject_write_store(struct mem_ctl_info *mci,
>  	return 0;
>  }
>  
> +/*
> + * update NUM_INJ_ATTRS in case you add new members
> + */
>  struct mcidev_sysfs_attribute amd64_inj_attrs[] = {
>  
>  	{


-- 

Cheers,
Mauro
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