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Message-ID: <20150128213011.GA2294@localhost.localdomain>
Date: Wed, 28 Jan 2015 23:30:11 +0200
From: Aya Mahfouz <mahfouz.saif.elyazal@...il.com>
To: Larry Finger <Larry.Finger@...inger.net>
Cc: Heba Aamer <heba93aamer@...il.com>, devel@...verdev.osuosl.org,
florian.c.schilhabel@...glemail.com, thomas@...uk.net,
rickard_strandqvist@...ctrumdigital.se, gregkh@...uxfoundation.org,
tapaswenipathak@...il.com, linux-kernel@...r.kernel.org,
sudipm.mukherjee@...il.com
Subject: Re: [PATCH] staging: rtl8712: fix Prefer ether_addr_copy() over
memcpy()
On Wed, Jan 28, 2015 at 10:48:40AM -0600, Larry Finger wrote:
> On 01/28/2015 09:53 AM, Heba Aamer wrote:
> >This patch fixes the following checkpatch.pl warning:
> >Prefer ether_addr_copy() over memcpy()
> >if the Ethernet addresses are __aligned(2)
> >
> >I used the following coccinelle script:
> >
> >@@
> >expression E1,E2;constant E3;
> >@@
> >
> >- memcpy(E1, E2, E3)
> >+ ether_addr_copy(E1, E2)
> >
> >
> >pahole showed that the used structs are aligned to u16.
>
> I think you can stop here. The commit message is much too long for a 2-line patch.
>
> BTW, have you tested this patch? In particular, it needs to be tested on an
> architecture where alignment is important. Using x86 is not sufficient. The
> reason I ask is that there have been a lot of patches lately that change
> locking and alignment issues that are only build tested, and have never been
> tested with real hardware on any platform.
>
> One other thing, checkpatch only suggests that this change should be made.
> It is certainly not mandatory. As you have not indicated that it has been
> tested,
>
> NACK
>
> Larry
>
Hello Larry,
Thank you for your patience. Heba has submitted this patch as part
of a workshop she currently attends. She has checked the alignment
through pahole and it showed that the variables of complex structs
are aligned. She has attached the output of pahole, so that the
community can verify her results and hence the lengthy output.
She can also cross compile the kernel and verify the output for
other architectures using pahole. Kindly let us know if this suits
you. And please name any specific architecture that you would to see
tested. If this is still not enough from your point of view, let
us know what should be done further to verify the correctness of
the patch.
Kind Regards,
Aya Saif El-yazal Mahfouz
> >
> >struct _adapter {
> > struct dvobj_priv dvobjpriv; /* 0 40 */
> > struct mlme_priv mlmepriv; /* 40 1560 */
> > /* --- cacheline 25 boundary (1600 bytes) --- */
> > struct cmd_priv cmdpriv; /* 1600 136 */
> > /* --- cacheline 27 boundary (1728 bytes) was 8 bytes ago --- */
> > struct evt_priv evtpriv; /* 1736 96 */
> > /* --- cacheline 28 boundary (1792 bytes) was 40 bytes ago --- */
> > struct io_queue * pio_queue; /* 1832 8 */
> > struct xmit_priv xmitpriv; /* 1840 912 */
> > /* --- cacheline 43 boundary (2752 bytes) --- */
> > struct recv_priv recvpriv; /* 2752 1088 */
> > /* --- cacheline 60 boundary (3840 bytes) --- */
> > struct sta_priv stapriv; /* 3840 672 */
> > /* --- cacheline 70 boundary (4480 bytes) was 32 bytes ago --- */
> > struct security_priv securitypriv; /* 4512 4816 */
> > /* --- cacheline 145 boundary (9280 bytes) was 48 bytes ago --- */
> > struct registry_priv registrypriv; /* 9328 968 */
> > /* --- cacheline 160 boundary (10240 bytes) was 56 bytes ago --- */
> > struct wlan_acl_pool acl_list; /* 10296 1536 */
> > /* --- cacheline 184 boundary (11776 bytes) was 56 bytes ago --- */
> > struct pwrctrl_priv pwrctrlpriv; /* 11832 224 */
> > /* --- cacheline 188 boundary (12032 bytes) was 24 bytes ago --- */
> > struct eeprom_priv eeprompriv; /* 12056 508 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > /* --- cacheline 196 boundary (12544 bytes) was 24 bytes ago --- */
> > struct hal_priv halpriv; /* 12568 88 */
> > /* --- cacheline 197 boundary (12608 bytes) was 48 bytes ago --- */
> > struct led_priv ledpriv; /* 12656 304 */
> > /* --- cacheline 202 boundary (12928 bytes) was 32 bytes ago --- */
> > struct mp_priv mppriv; /* 12960 1080 */
> > /* --- cacheline 219 boundary (14016 bytes) was 24 bytes ago --- */
> > s32 bDriverStopped; /* 14040 4 */
> > s32 bSurpriseRemoved; /* 14044 4 */
> > u32 IsrContent; /* 14048 4 */
> > u32 ImrContent; /* 14052 4 */
> > u8 EepromAddressSize; /* 14056 1 */
> > u8 hw_init_completed; /* 14057 1 */
> >
> > /* XXX 6 bytes hole, try to pack */
> >
> > struct task_struct * cmdThread; /* 14064 8 */
> > pid_t evtThread; /* 14072 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > /* --- cacheline 220 boundary (14080 bytes) --- */
> > struct task_struct * xmitThread; /* 14080 8 */
> > pid_t recvThread; /* 14088 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > uint (*dvobj_init)(struct _adapter *); /* 14096 8 */
> > void (*dvobj_deinit)(struct _adapter *); /* 14104 8 */
> > struct net_device * pnetdev; /* 14112 8 */
> > int bup; /* 14120 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > struct net_device_stats stats; /* 14128 184 */
> > /* --- cacheline 223 boundary (14272 bytes) was 40 bytes ago --- */
> > struct iw_statistics iwstats; /* 14312 32 */
> > /* --- cacheline 224 boundary (14336 bytes) was 8 bytes ago --- */
> > int pid; /* 14344 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > struct work_struct wkFilterRxFF0; /* 14352 32 */
> > u8 blnEnableRxFF0Filter; /* 14384 1 */
> >
> > /* XXX 3 bytes hole, try to pack */
> >
> > spinlock_t lockRxFF0Filter; /* 14388 4 */
> > const struct firmware * fw; /* 14392 8 */
> > /* --- cacheline 225 boundary (14400 bytes) --- */
> > struct usb_interface * pusb_intf; /* 14400 8 */
> > struct mutex mutex_start; /* 14408 40 */
> >
> > /* XXX last struct has 4 bytes of padding */
> >
> > struct completion rtl8712_fw_ready; /* 14448 32 */
> > /* --- cacheline 226 boundary (14464 bytes) was 16 bytes ago --- */
> >
> > /* size: 14480, cachelines: 227, members: 40 */
> > /* sum members: 14451, holes: 7, sum holes: 29 */
> > /* paddings: 1, sum paddings: 4 */
> > /* last cacheline: 16 bytes */
> >};
> >
> >struct eeprom_priv {
> > u8 bautoload_fail_flag; /* 0 1 */
> > u8 bempty; /* 1 1 */
> > u8 sys_config; /* 2 1 */
> > u8 mac_addr[6]; /* 3 6 */
> > u8 config0; /* 9 1 */
> > u16 channel_plan; /* 10 2 */
> > u8 country_string[3]; /* 12 3 */
> > u8 tx_power_b[15]; /* 15 15 */
> > u8 tx_power_g[15]; /* 30 15 */
> > u8 tx_power_a[201]; /* 45 201 */
> > /* --- cacheline 3 boundary (192 bytes) was 54 bytes ago --- */
> > u8 efuse_eeprom_data[256]; /* 246 256 */
> >
> > /* XXX 2 bytes hole, try to pack */
> >
> > /* --- cacheline 7 boundary (448 bytes) was 56 bytes ago --- */
> > enum RT_CUSTOMER_ID CustomerID; /* 504 4 */
> >
> > /* size: 508, cachelines: 8, members: 12 */
> > /* sum members: 506, holes: 1, sum holes: 2 */
> > /* last cacheline: 60 bytes */
> >};
> >
> >struct net_device {
> > char name[16]; /* 0 16 */
> > struct hlist_node name_hlist; /* 16 16 */
> > char * ifalias; /* 32 8 */
> > long unsigned int mem_end; /* 40 8 */
> > long unsigned int mem_start; /* 48 8 */
> > long unsigned int base_addr; /* 56 8 */
> > /* --- cacheline 1 boundary (64 bytes) --- */
> > int irq; /* 64 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > long unsigned int state; /* 72 8 */
> > struct list_head dev_list; /* 80 16 */
> > struct list_head napi_list; /* 96 16 */
> > struct list_head unreg_list; /* 112 16 */
> > /* --- cacheline 2 boundary (128 bytes) --- */
> > struct list_head close_list; /* 128 16 */
> > struct {
> > struct list_head upper; /* 144 16 */
> > struct list_head lower; /* 160 16 */
> > } adj_list; /* 144 32 */
> > struct {
> > struct list_head upper; /* 176 16 */
> > struct list_head lower; /* 192 16 */
> > } all_adj_list; /* 176 32 */
> > /* --- cacheline 3 boundary (192 bytes) was 16 bytes ago --- */
> > netdev_features_t features; /* 208 8 */
> > netdev_features_t hw_features; /* 216 8 */
> > netdev_features_t wanted_features; /* 224 8 */
> > netdev_features_t vlan_features; /* 232 8 */
> > netdev_features_t hw_enc_features; /* 240 8 */
> > netdev_features_t mpls_features; /* 248 8 */
> > /* --- cacheline 4 boundary (256 bytes) --- */
> > int ifindex; /* 256 4 */
> > int iflink; /* 260 4 */
> > struct net_device_stats stats; /* 264 184 */
> > /* --- cacheline 7 boundary (448 bytes) --- */
> > atomic_long_t rx_dropped; /* 448 8 */
> > atomic_long_t tx_dropped; /* 456 8 */
> > atomic_t carrier_changes; /* 464 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > const struct iw_handler_def * wireless_handlers; /* 472 8 */
> > struct iw_public_data * wireless_data; /* 480 8 */
> > const struct net_device_ops * netdev_ops; /* 488 8 */
> > const struct ethtool_ops * ethtool_ops; /* 496 8 */
> > const struct forwarding_accel_ops * fwd_ops; /* 504 8 */
> > /* --- cacheline 8 boundary (512 bytes) --- */
> > const struct header_ops * header_ops; /* 512 8 */
> > unsigned int flags; /* 520 4 */
> > unsigned int priv_flags; /* 524 4 */
> > short unsigned int gflags; /* 528 2 */
> > short unsigned int padded; /* 530 2 */
> > unsigned char operstate; /* 532 1 */
> > unsigned char link_mode; /* 533 1 */
> > unsigned char if_port; /* 534 1 */
> > unsigned char dma; /* 535 1 */
> > unsigned int mtu; /* 536 4 */
> > short unsigned int type; /* 540 2 */
> > short unsigned int hard_header_len; /* 542 2 */
> > short unsigned int needed_headroom; /* 544 2 */
> > short unsigned int needed_tailroom; /* 546 2 */
> > unsigned char perm_addr[32]; /* 548 32 */
> > /* --- cacheline 9 boundary (576 bytes) was 4 bytes ago --- */
> > unsigned char addr_assign_type; /* 580 1 */
> > unsigned char addr_len; /* 581 1 */
> > short unsigned int neigh_priv_len; /* 582 2 */
> > short unsigned int dev_id; /* 584 2 */
> > short unsigned int dev_port; /* 586 2 */
> > spinlock_t addr_list_lock; /* 588 4 */
> > struct netdev_hw_addr_list uc; /* 592 24 */
> > struct netdev_hw_addr_list mc; /* 616 24 */
> > /* --- cacheline 10 boundary (640 bytes) --- */
> > struct netdev_hw_addr_list dev_addrs; /* 640 24 */
> > struct kset * queues_kset; /* 664 8 */
> > unsigned char name_assign_type; /* 672 1 */
> > bool uc_promisc; /* 673 1 */
> >
> > /* XXX 2 bytes hole, try to pack */
> >
> > unsigned int promiscuity; /* 676 4 */
> > unsigned int allmulti; /* 680 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > struct vlan_info * vlan_info; /* 688 8 */
> > struct dsa_switch_tree * dsa_ptr; /* 696 8 */
> > /* --- cacheline 11 boundary (704 bytes) --- */
> > struct tipc_bearer * tipc_ptr; /* 704 8 */
> > void * atalk_ptr; /* 712 8 */
> > struct in_device * ip_ptr; /* 720 8 */
> > struct dn_dev * dn_ptr; /* 728 8 */
> > struct inet6_dev * ip6_ptr; /* 736 8 */
> > void * ax25_ptr; /* 744 8 */
> > struct wireless_dev * ieee80211_ptr; /* 752 8 */
> > struct wpan_dev * ieee802154_ptr; /* 760 8 */
> > /* --- cacheline 12 boundary (768 bytes) --- */
> > long unsigned int last_rx; /* 768 8 */
> > unsigned char * dev_addr; /* 776 8 */
> > struct netdev_rx_queue * _rx; /* 784 8 */
> > unsigned int num_rx_queues; /* 792 4 */
> > unsigned int real_num_rx_queues; /* 796 4 */
> > long unsigned int gro_flush_timeout; /* 800 8 */
> > rx_handler_func_t * rx_handler; /* 808 8 */
> > void * rx_handler_data; /* 816 8 */
> > struct netdev_queue * ingress_queue; /* 824 8 */
> > /* --- cacheline 13 boundary (832 bytes) --- */
> > unsigned char broadcast[32]; /* 832 32 */
> >
> > /* XXX 32 bytes hole, try to pack */
> >
> > /* --- cacheline 14 boundary (896 bytes) --- */
> > struct netdev_queue * _tx; /* 896 8 */
> > unsigned int num_tx_queues; /* 904 4 */
> > unsigned int real_num_tx_queues; /* 908 4 */
> > struct Qdisc * qdisc; /* 912 8 */
> > long unsigned int tx_queue_len; /* 920 8 */
> > spinlock_t tx_global_lock; /* 928 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > struct xps_dev_maps * xps_maps; /* 936 8 */
> > struct cpu_rmap * rx_cpu_rmap; /* 944 8 */
> > long unsigned int trans_start; /* 952 8 */
> > /* --- cacheline 15 boundary (960 bytes) --- */
> > int watchdog_timeo; /* 960 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > struct timer_list watchdog_timer; /* 968 80 */
> > /* --- cacheline 16 boundary (1024 bytes) was 24 bytes ago --- */
> > int * pcpu_refcnt; /* 1048 8 */
> > struct list_head todo_list; /* 1056 16 */
> > struct hlist_node index_hlist; /* 1072 16 */
> > /* --- cacheline 17 boundary (1088 bytes) --- */
> > struct list_head link_watch_list; /* 1088 16 */
> > enum {
> > NETREG_UNINITIALIZED = 0,
> > NETREG_REGISTERED = 1,
> > NETREG_UNREGISTERING = 2,
> > NETREG_UNREGISTERED = 3,
> > NETREG_RELEASED = 4,
> > NETREG_DUMMY = 5,
> > } reg_state:8; /* 1104 4 */
> >
> > /* Bitfield combined with next fields */
> >
> > bool dismantle; /* 1105 1 */
> >
> > /* Bitfield combined with previous fields */
> >
> > enum {
> > RTNL_LINK_INITIALIZED = 0,
> > RTNL_LINK_INITIALIZING = 1,
> > } rtnl_link_state:16; /* 1104 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > void (*destructor)(struct net_device *); /* 1112 8 */
> > struct netpoll_info * npinfo; /* 1120 8 */
> > struct net * nd_net; /* 1128 8 */
> > union {
> > void * ml_priv; /* 8 */
> > struct pcpu_lstats * lstats; /* 8 */
> > struct pcpu_sw_netstats * tstats; /* 8 */
> > struct pcpu_dstats * dstats; /* 8 */
> > struct pcpu_vstats * vstats; /* 8 */
> > }; /* 1136 8 */
> > struct garp_port * garp_port; /* 1144 8 */
> > /* --- cacheline 18 boundary (1152 bytes) was 4 bytes ago --- */
> > struct mrp_port * mrp_port; /* 1152 8 */
> > struct device dev; /* 1160 688 */
> >
> > /* XXX last struct has 7 bytes of padding */
> >
> > /* --- cacheline 28 boundary (1792 bytes) was 60 bytes ago --- */
> > const struct attribute_group * sysfs_groups[4]; /* 1848 32 */
> > /* --- cacheline 29 boundary (1856 bytes) was 28 bytes ago --- */
> > const struct attribute_group * sysfs_rx_queue_group; /* 1880 8 */
> > const struct rtnl_link_ops * rtnl_link_ops; /* 1888 8 */
> > unsigned int gso_max_size; /* 1896 4 */
> > u16 gso_max_segs; /* 1900 2 */
> > u16 gso_min_segs; /* 1902 2 */
> > const struct dcbnl_rtnl_ops * dcbnl_ops; /* 1904 8 */
> > u8 num_tc; /* 1912 1 */
> >
> > /* XXX 1 byte hole, try to pack */
> >
> > struct netdev_tc_txq tc_to_txq[16]; /* 1914 64 */
> > /* --- cacheline 30 boundary (1920 bytes) was 62 bytes ago --- */
> > u8 prio_tc_map[16]; /* 1978 16 */
> >
> > /* XXX 2 bytes hole, try to pack */
> >
> > /* --- cacheline 31 boundary (1984 bytes) was 16 bytes ago --- */
> > unsigned int fcoe_ddp_xid; /* 1996 4 */
> > struct phy_device * phydev; /* 2000 8 */
> > struct lock_class_key * qdisc_tx_busylock; /* 2008 8 */
> > int group; /* 2016 4 */
> >
> > /* XXX 4 bytes hole, try to pack */
> >
> > struct pm_qos_request pm_qos_req; /* 2024 176 */
> > /* --- cacheline 34 boundary (2176 bytes) was 28 bytes ago --- */
> >
> > /* size: 2240, cachelines: 35, members: 120 */
> > /* sum members: 2139, holes: 11, sum holes: 65 */
> > /* padding: 40 */
> > /* paddings: 1, sum paddings: 7 */
> >
> > /* BRAIN FART ALERT! 2240 != 2139 + 65(holes), diff = 36 */
> >
> >};
> >
> >Moreover mac and pdata are simple arrays and pointers.
> >
> >Signed-off-by: Heba Aamer <heba93aamer@...il.com>
> >---
> > drivers/staging/rtl8712/usb_intf.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> >diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
> >index 15f0d42..a2f2dfb 100644
> >--- a/drivers/staging/rtl8712/usb_intf.c
> >+++ b/drivers/staging/rtl8712/usb_intf.c
> >@@ -463,7 +463,7 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
> > /* Use the mac address stored in the Efuse
> > * offset = 0x12 for usb in efuse
> > */
> >- memcpy(mac, &pdata[0x12], ETH_ALEN);
> >+ ether_addr_copy(mac, &pdata[0x12]);
> > }
> > eeprom_CustomerID = pdata[0x52];
> > switch (eeprom_CustomerID) {
> >@@ -580,7 +580,7 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
> > } else
> > dev_info(&udev->dev,
> > "r8712u: MAC Address from efuse = %pM\n", mac);
> >- memcpy(pnetdev->dev_addr, mac, ETH_ALEN);
> >+ ether_addr_copy(pnetdev->dev_addr, mac);
> > }
> > /* step 6. Load the firmware asynchronously */
> > if (rtl871x_load_fw(padapter))
> >
>
> _______________________________________________
> devel mailing list
> devel@...uxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
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