2359b5c2d9
This patch focuses on fixing the following warning generated
by checkpatch.pl for the file rxtx.c :
Prefer ether_addr_copy() over memcpy() if the Ethernet addresses
are __aligned(2)
The changes were applied using the following coccinelle rule:
@@ expression e1, e2; @@
- memcpy(e1, e2, ETH_ALEN);
+ ether_addr_copy(e1, e2);
After applying the rule, some referencing operations were
adjusted manually to avoid a gcc compilation warning.
According to ether_addr_copy() description and functionality,
all Ethernet addresses should align to the u16 datatype.
A check was made on the following datastructures:
- vnt_mic_hdr
- tagS802_11Header
- tagSEthernetHeader
- vnt_rts_g
- ieee80211_rts
- vnt_private
To maintain that the array abyCurrentNetAddr in vnt_private is aligned,
it was placed before the boolean bLinkPass in the struct definition.
The definition can be found in device.h. A couple of variables were
packed in holes detected by pahole.
Output of pahole when running it on rxtx.o after the changes:
truct tagSEthernetHeader {
unsigned char abyDstAddr[6]; /* 0 6 */
unsigned char abySrcAddr[6]; /* 6 6 */
short unsigned int wType; /* 12 2 */
/* size: 14, cachelines: 1, members: 3 */
/* last cacheline: 14 bytes */
};
struct tagS802_11Header {
short unsigned int wFrameCtl; /* 0 2 */
short unsigned int wDurationID; /* 2 2 */
unsigned char abyAddr1[6]; /* 4 6 */
unsigned char abyAddr2[6]; /* 10 6 */
unsigned char abyAddr3[6]; /* 16 6 */
short unsigned int wSeqCtl; /* 22 2 */
unsigned char abyAddr4[6]; /* 24 6 */
/* size: 30, cachelines: 1, members: 7 */
/* last cacheline: 30 bytes */
};
struct ieee80211_rts {
__le16 frame_control; /* 0 2 */
__le16 duration; /* 2 2 */
u8 ra[6]; /* 4 6 */
u8 ta[6]; /* 10 6 */
/* size: 16, cachelines: 1, members: 4 */
/* last cacheline: 16 bytes */
};
struct vnt_private {
struct pci_dev * pcid; /* 0 4 */
struct net_device * dev; /* 4 4 */
dma_addr_t pool_dma; /* 8 4 */
dma_addr_t rd0_pool_dma; /* 12 4 */
dma_addr_t rd1_pool_dma; /* 16 4 */
dma_addr_t td0_pool_dma; /* 20 4 */
dma_addr_t td1_pool_dma; /* 24 4 */
dma_addr_t tx_bufs_dma0; /* 28 4 */
dma_addr_t tx_bufs_dma1; /* 32 4 */
dma_addr_t tx_beacon_dma; /* 36 4 */
unsigned char * tx0_bufs; /* 40 4 */
unsigned char * tx1_bufs; /* 44 4 */
unsigned char * tx_beacon_bufs; /* 48 4 */
CHIP_TYPE chip_id; /* 52 4 */
void * PortOffset; /* 56 4 */
long unsigned int dwIsr; /* 60 4 */
/*--- cacheline 1 boundary (64 bytes) ---*/
u32 memaddr; /* 64 4 */
u32 ioaddr; /* 68 4 */
u32 io_size; /* 72 4 */
unsigned char byRevId; /* 76 1 */
unsigned char byRxMode; /* 77 1 */
short unsigned int SubSystemID; /* 78 2 */
short unsigned int SubVendorID; /* 80 2 */
spinlock_t lock; /* 82 2 */
int nTxQueues; /* 84 4 */
volatile int iTDUsed; /* 88 8 */
volatile PSTxDesc apCurrTD; /* 96 8 */
volatile PSTxDesc apTailTD; /* 104 8 */
volatile PSTxDesc apTD0Rings; /* 112 4 */
volatile PSTxDesc apTD1Rings; /* 116 4 */
volatile PSRxDesc aRD0Ring; /* 120 4 */
volatile PSRxDesc aRD1Ring; /* 124 4 */
/*--- cacheline 2 boundary (128 bytes) ---*/
volatile PSRxDesc pCurrRD; /* 128 8 */
SCache sDupRxCache; /* 136 44 */
SDeFragControlBlock sRxDFCB[64]; /* 180 2048 */
/*--- cacheline 34 boundary (2176 bytes) was 52 bytes ago ---*/
unsigned int cbDFCB; /* 2228 4 */
unsigned int cbFreeDFCB; /* 2232 4 */
unsigned int uCurrentDFCBIdx; /* 2236 4 */
/*--- cacheline 35 boundary (2240 bytes) ---*/
OPTIONS sOpts; /* 2240 52 */
u32 flags; /* 2292 4 */
u32 rx_buf_sz; /* 2296 4 */
int multicast_limit; /* 2300 4 */
/*--- cacheline 36 boundary (2304 bytes) ---*/
pid_t MLMEThr_pid; /* 2304 4 */
struct completion notify; /* 2308 16 */
struct semaphore mlme_semaphore; /* 2324 16 */
u32 rx_bytes; /* 2340 4 */
unsigned char byLocalID; /* 2344 1 */
unsigned char byRFType; /* 2345 1 */
unsigned char byMaxPwrLevel; /* 2346 1 */
unsigned char byZoneType; /* 2347 1 */
bool bZoneRegExist; /* 2348 1 */
unsigned char byOriginalZonetype; /* 2349 1 */
unsigned char abyMacContext[384]; /* 2350 384 */
/*--- cacheline 42 boundary (2688 bytes) was 46 bytes ago ---*/
unsigned char abyCurrentNetAddr[6]; /* 2734 6 */
bool bLinkPass; /* 2740 1 */
/* XXX 3 bytes hole, try to pack */
SStatCounter scStatistic; /* 2744 776 */
/*--- cacheline 55 boundary (3520 bytes) ---*/
SDot11Counters s802_11Counter; /* 3520 172 */
/*--- cacheline 57 boundary (3648 bytes) was 44 bytes ago ---*/
PSMgmtObject pMgmt; /* 3692 4 */
SMgmtObject sMgmtObj; /* 3696 95840 */
/*--- cacheline 1555 boundary (99520 bytes) was 16 bytes ago ---*/
/* Bitfield combined with previous fields */
unsigned int uCurrRSSI; /* 0 4 */
unsigned char byCurrSQ; /* 0 1 */
long unsigned int dwTxAntennaSel; /* 0 4 */
long unsigned int dwRxAntennaSel; /* 0 4 */
unsigned char byAntennaCount; /* 0 1 */
unsigned char byRxAntennaMode; /* 0 1 */
unsigned char byTxAntennaMode; /* 0 1 */
bool bTxRxAntInv; /* 0 1 */
unsigned char * pbyTmpBuff; /* 0 4 */
unsigned int uSIFS; /* 0 4 */
unsigned int uDIFS; /* 0 4 */
unsigned int uEIFS; /* 0 4 */
unsigned int uSlot; /* 0 4 */
unsigned int uCwMin; /* 0 4 */
unsigned int uCwMax; /* 0 4 */
unsigned char bySIFS; /* 0 1 */
unsigned char byDIFS; /* 0 1 */
unsigned char byEIFS; /* 0 1 */
unsigned char bySlot; /* 0 1 */
unsigned char byCWMaxMin; /* 0 1 */
CARD_PHY_TYPE eCurrentPHYType; /* 0 4 */
VIA_BB_TYPE byBBType; /* 0 4 */
VIA_PKT_TYPE byPacketType; /* 0 4 */
short unsigned int wBasicRate; /* 0 2 */
unsigned char byACKRate; /* 0 1 */
unsigned char byTopOFDMBasicRate; /* 0 1 */
unsigned char byTopCCKBasicRate; /* 0 1 */
unsigned char byMinChannel; /* 0 1 */
unsigned char byMaxChannel; /* 0 1 */
unsigned int uConnectionRate; /* 0 4 */
unsigned char byPreambleType; /* 0 1 */
unsigned char byShortPreamble; /* 0 1 */
short unsigned int wCurrentRate; /* 0 2 */
short unsigned int wRTSThreshold; /* 0 2 */
short unsigned int wFragmentationThreshold; /* 0 2 */
unsigned char byShortRetryLimit; /* 0 1 */
unsigned char byLongRetryLimit; /* 0 1 */
enum nl80211_iftype op_mode; /* 0 4 */
unsigned char byOpMode; /* 0 1 */
bool bBSSIDFilter; /* 0 1 */
short unsigned int wMaxTransmitMSDULifetime; /* 0 2 */
unsigned char abyBSSID[6]; /* 0 6 */
unsigned char abyDesireBSSID[6]; /* 0 6 */
short unsigned int wACKDuration; /* 0 2 */
short unsigned int wRTSTransmitLen; /* 0 2 */
unsigned char byRTSServiceField; /* 0 1 */
unsigned char byRTSSignalField; /* 0 1 */
long unsigned int dwMaxReceiveLifetime; /* 0 4 */
bool bEncryptionEnable; /* 0 1 */
bool bLongHeader; /* 0 1 */
bool bShortSlotTime; /* 0 1 */
bool bProtectMode; /* 0 1 */
bool bNonERPPresent; /* 0 1 */
bool bBarkerPreambleMd; /* 0 1 */
unsigned char byERPFlag; /* 0 1 */
short unsigned int wUseProtectCntDown; /* 0 2 */
bool bRadioControlOff; /* 0 1 */
bool bRadioOff; /* 0 1 */
bool bEnablePSMode; /* 0 1 */
short unsigned int wListenInterval; /* 0 2 */
bool bPWBitOn; /* 0 1 */
WMAC_POWER_MODE ePSMode; /* 0 4 */
unsigned char byRadioCtl; /* 0 1 */
unsigned char byGPIO; /* 0 1 */
bool bHWRadioOff; /* 0 1 */
bool bPrvActive4RadioOFF; /* 0 1 */
bool bGPIOBlockRead; /* 0 1 */
short unsigned int wSeqCounter; /* 0 2 */
short unsigned int wBCNBufLen; /* 0 2 */
bool bBeaconBufReady; /* 0 1 */
bool bBeaconSent; /* 0 1 */
bool bIsBeaconBufReadySet; /* 0 1 */
unsigned int cbBeaconBufReadySetCnt; /* 0 4 */
bool bFixRate; /* 0 1 */
unsigned char byCurrentCh; /* 0 1 */
unsigned int uScanTime; /* 0 4 */
CMD_STATE eCommandState; /* 0 4 */
CMD_CODE eCommand; /* 0 4 */
bool bBeaconTx; /* 0 1 */
bool bStopBeacon; /* 0 1 */
bool bStopDataPkt; /* 0 1 */
bool bStopTx0Pkt; /* 0 1 */
unsigned int uAutoReConnectTime; /* 0 4 */
CMD_ITEM eCmdQueue[32]; /* 0 1408 */
unsigned int uCmdDequeueIdx; /* 0 4 */
unsigned int uCmdEnqueueIdx; /* 0 4 */
unsigned int cbFreeCmdQueue; /* 0 4 */
bool bCmdRunning; /* 0 1 */
bool bCmdClear; /* 0 1 */
bool bRoaming; /* 0 1 */
unsigned char abyIPAddr[4]; /* 0 4 */
long unsigned int ulTxPower; /* 0 4 */
NDIS_802_11_WEP_STATUS eEncryptionStatus; /* 0 4 */
bool bTransmitKey; /* 0 1 */
NDIS_802_11_WEP_STATUS eOldEncryptionStatus; /* 0 4 */
SKeyManagement sKey; /* 0 3784 */
long unsigned int dwIVCounter; /* 0 4 */
u64 qwPacketNumber; /* 0 8 */
unsigned int uCurrentWEPMode; /* 0 4 */
RC4Ext SBox; /* 0 264 */
unsigned char abyPRNG[35]; /* 0 35 */
unsigned char byKeyIndex; /* 0 1 */
unsigned int uKeyLength; /* 0 4 */
unsigned char abyKey[29]; /* 0 29 */
bool bAES; /* 0 1 */
unsigned char byCntMeasure; /* 0 1 */
unsigned int uAssocCount; /* 0 4 */
bool bMoreData; /* 0 1 */
bool bGrpAckPolicy; /* 0 1 */
bool bAssocInfoSet; /* 0 1 */
unsigned char byAutoFBCtrl; /* 0 1 */
bool bTxMICFail; /* 0 1 */
bool bRxMICFail; /* 0 1 */
unsigned int uRATEIdx; /* 0 4 */
bool bUpdateBBVGA; /* 0 1 */
unsigned int uBBVGADiffCount; /* 0 4 */
unsigned char byBBVGANew; /* 0 1 */
unsigned char byBBVGACurrent; /* 0 1 */
unsigned char abyBBVGA[4]; /* 0 4 */
long int ldBmThreshold[4]; /* 0 16 */
unsigned char byBBPreEDRSSI; /* 0 1 */
unsigned char byBBPreEDIndex; /* 0 1 */
bool bRadioCmd; /* 0 1 */
long unsigned int dwDiagRefCount; /* 0 4 */
unsigned char byFOETuning; /* 0 1 */
unsigned char byAutoPwrTunning; /* 0 1 */
short int sPSetPointCCK; /* 0 2 */
short int sPSetPointOFDMG; /* 0 2 */
short int sPSetPointOFDMA; /* 0 2 */
long int lPFormulaOffset; /* 0 4 */
short int sPThreshold; /* 0 2 */
char cAdjustStep; /* 0 1 */
char cMinTxAGC; /* 0 1 */
unsigned char byCCKPwr; /* 0 1 */
unsigned char byOFDMPwrG; /* 0 1 */
unsigned char byCurPwr; /* 0 1 */
char byCurPwrdBm; /* 0 1 */
unsigned char abyCCKPwrTbl[15]; /* 0 15 */
unsigned char abyOFDMPwrTbl[57]; /* 0 57 */
char abyCCKDefaultPwr[15]; /* 0 15 */
char abyOFDMDefaultPwr[57]; /* 0 57 */
char abyRegPwr[57]; /* 0 57 */
char abyLocalPwr[57]; /* 0 57 */
unsigned char byBBCR4d; /* 0 1 */
unsigned char byBBCRc9; /* 0 1 */
unsigned char byBBCR88; /* 0 1 */
unsigned char byBBCR09; /* 0 1 */
struct timer_list sTimerCommand; /* 0 52 */
struct timer_list sTimerTxData; /* 0 52 */
long unsigned int nTxDataTimeCout; /* 0 4 */
bool fTxDataInSleep; /* 0 1 */
bool IsTxDataTrigger; /* 0 1 */
bool fWPA_Authened; /* 0 1 */
unsigned char byReAssocCount; /* 0 1 */
unsigned char byLinkWaitCount; /* 0 1 */
unsigned char abyNodeName[17]; /* 0 17 */
bool bDiversityRegCtlON; /* 0 1 */
bool bDiversityEnable; /* 0 1 */
long unsigned int ulDiversityNValue; /* 0 4 */
long unsigned int ulDiversityMValue; /* 0 4 */
unsigned char byTMax; /* 0 1 */
unsigned char byTMax2; /* 0 1 */
unsigned char byTMax3; /* 0 1 */
long unsigned int ulSQ3TH; /* 0 4 */
long unsigned int uDiversityCnt; /* 0 4 */
unsigned char byAntennaState; /* 0 1 */
long unsigned int ulRatio_State0; /* 0 4 */
long unsigned int ulRatio_State1; /* 0 4 */
struct timer_list TimerSQ3Tmax1; /* 0 52 */
struct timer_list TimerSQ3Tmax2; /* 0 52 */
struct timer_list TimerSQ3Tmax3; /* 0 52 */
long unsigned int uNumSQ3[12]; /* 0 48 */
short unsigned int wAntDiversityMaxRate; /* 0 2 */
SEthernetHeader sTxEthHeader; /* 0 14 */
SEthernetHeader sRxEthHeader; /* 0 14 */
unsigned char abyBroadcastAddr[6]; /* 0 6 */
unsigned char abySNAP_RFC1042[6]; /* 0 6 */
unsigned char abySNAP_Bridgetunnel[6]; /* 0 6 */
unsigned char abyEEPROM[256]; /* 0 256 */
SPMKID gsPMKID; /* 0 360 */
SPMKIDCandidateEvent gsPMKIDCandidate; /* 0 72 */
bool b11hEnable; /* 0 1 */
unsigned char abyCountryCode[3]; /* 0 3 */
unsigned int uNumOfMeasureEIDs; /* 0 4 */
PWLAN_IE_MEASURE_REQ pCurrMeasureEID; /* 0 4 */
bool bMeasureInProgress; /* 0 1 */
unsigned char byOrgChannel; /* 0 1 */
unsigned char byOrgRCR; /* 0 1 */
long unsigned int dwOrgMAR0; /* 0 4 */
long unsigned int dwOrgMAR4; /* 0 4 */
unsigned char byBasicMap; /* 0 1 */
unsigned char byCCAFraction; /* 0 1 */
unsigned char abyRPIs[8]; /* 0 8 */
long unsigned int dwRPIs[8]; /* 0 32 */
bool bChannelSwitch; /* 0 1 */
unsigned char byNewChannel; /* 0 1 */
unsigned char byChannelSwitchCount; /* 0 1 */
bool bQuietEnable; /* 0 1 */
bool bEnableFirstQuiet; /* 0 1 */
unsigned char byQuietStartCount; /* 0 1 */
unsigned int uQuietEnqueue; /* 0 4 */
long unsigned int dwCurrentQuietEndTime; /* 0 4 */
SQuietControl sQuiet[8]; /* 0 96 */
bool bCountryInfo5G; /* 0 1 */
bool bCountryInfo24G; /* 0 1 */
short unsigned int wBeaconInterval; /* 0 2 */
struct net_device * wpadev; /* 0 4 */
bool bWPADEVUp; /* 0 1 */
struct sk_buff * skb; /* 0 4 */
unsigned int bwextcount; /* 0 4 */
bool bWPASuppWextEnabled; /* 0 1 */
bool bEnableHostapd; /* 0 1 */
bool bEnable8021x; /* 0 1 */
bool bEnableHostWEP; /* 0 1 */
struct net_device * apdev; /* 0 4 */
int (*tx_80211)(struct sk_buff *,
struct net_device *); /* 0 4 */
unsigned int uChannel; /* 0 4 */
bool bMACSuspend; /* 0 1 */
struct iw_statistics wstats; /* 0 32 */
bool bCommit; /* 0 1 */
/*--- cacheline 1672 boundary (107008 bytes) ---*/
/* size: 107008, cachelines: 1672, members: 279 */
/* sum members: 107005, holes: 1, sum holes: 3 */
/* padding: 41471 */
/* BRAIN FART ALERT! 107008 != 107005 + 3(holes), diff = 0 */
};
struct vnt_mic_hdr {
u8 id; /* 0 1 */
u8 tx_priority; /* 1 1 */
u8 mic_addr2[6]; /* 2 6 */
u8 ccmp_pn[6]; /* 8 6 */
__be16 payload_len; /* 14 2 */
__be16 hlen; /* 16 2 */
__le16 frame_control; /* 18 2 */
u8 addr1[6]; /* 20 6 */
u8 addr2[6]; /* 26 6 */
u8 addr3[6]; /* 32 6 */
__le16 seq_ctrl; /* 38 2 */
u8 addr4[6]; /* 40 6 */
u16 packing; /* 46 2 */
/* size: 48, cachelines: 1, members: 13 */
/* last cacheline: 48 bytes */
};
struct vnt_rts_g {
struct vnt_phy_field b; /* 0 4 */
struct vnt_phy_field a; /* 4 4 */
__le16 duration_ba; /* 8 2 */
__le16 duration_aa; /* 10 2 */
__le16 duration_bb; /* 12 2 */
u16 reserved; /* 14 2 */
struct ieee80211_rts data; /* 16 16 */
/* size: 32, cachelines: 1, members: 7 */
/* last cacheline: 32 bytes */
};
Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel release 3.x <http://kernel.org/>
These are the release notes for Linux version 3. Read them carefully,
as they tell you what this is all about, explain how to install the
kernel, and what to do if something goes wrong.
WHAT IS LINUX?
Linux is a clone of the operating system Unix, written from scratch by
Linus Torvalds with assistance from a loosely-knit team of hackers across
the Net. It aims towards POSIX and Single UNIX Specification compliance.
It has all the features you would expect in a modern fully-fledged Unix,
including true multitasking, virtual memory, shared libraries, demand
loading, shared copy-on-write executables, proper memory management,
and multistack networking including IPv4 and IPv6.
It is distributed under the GNU General Public License - see the
accompanying COPYING file for more details.
ON WHAT HARDWARE DOES IT RUN?
Although originally developed first for 32-bit x86-based PCs (386 or higher),
today Linux also runs on (at least) the Compaq Alpha AXP, Sun SPARC and
UltraSPARC, Motorola 68000, PowerPC, PowerPC64, ARM, Hitachi SuperH, Cell,
IBM S/390, MIPS, HP PA-RISC, Intel IA-64, DEC VAX, AMD x86-64, AXIS CRIS,
Xtensa, Tilera TILE, AVR32 and Renesas M32R architectures.
Linux is easily portable to most general-purpose 32- or 64-bit architectures
as long as they have a paged memory management unit (PMMU) and a port of the
GNU C compiler (gcc) (part of The GNU Compiler Collection, GCC). Linux has
also been ported to a number of architectures without a PMMU, although
functionality is then obviously somewhat limited.
Linux has also been ported to itself. You can now run the kernel as a
userspace application - this is called UserMode Linux (UML).
DOCUMENTATION:
- There is a lot of documentation available both in electronic form on
the Internet and in books, both Linux-specific and pertaining to
general UNIX questions. I'd recommend looking into the documentation
subdirectories on any Linux FTP site for the LDP (Linux Documentation
Project) books. This README is not meant to be documentation on the
system: there are much better sources available.
- There are various README files in the Documentation/ subdirectory:
these typically contain kernel-specific installation notes for some
drivers for example. See Documentation/00-INDEX for a list of what
is contained in each file. Please read the Changes file, as it
contains information about the problems, which may result by upgrading
your kernel.
- The Documentation/DocBook/ subdirectory contains several guides for
kernel developers and users. These guides can be rendered in a
number of formats: PostScript (.ps), PDF, HTML, & man-pages, among others.
After installation, "make psdocs", "make pdfdocs", "make htmldocs",
or "make mandocs" will render the documentation in the requested format.
INSTALLING the kernel source:
- If you install the full sources, put the kernel tarball in a
directory where you have permissions (eg. your home directory) and
unpack it:
gzip -cd linux-3.X.tar.gz | tar xvf -
or
bzip2 -dc linux-3.X.tar.bz2 | tar xvf -
Replace "X" with the version number of the latest kernel.
Do NOT use the /usr/src/linux area! This area has a (usually
incomplete) set of kernel headers that are used by the library header
files. They should match the library, and not get messed up by
whatever the kernel-du-jour happens to be.
- You can also upgrade between 3.x releases by patching. Patches are
distributed in the traditional gzip and the newer bzip2 format. To
install by patching, get all the newer patch files, enter the
top level directory of the kernel source (linux-3.X) and execute:
gzip -cd ../patch-3.x.gz | patch -p1
or
bzip2 -dc ../patch-3.x.bz2 | patch -p1
Replace "x" for all versions bigger than the version "X" of your current
source tree, _in_order_, and you should be ok. You may want to remove
the backup files (some-file-name~ or some-file-name.orig), and make sure
that there are no failed patches (some-file-name# or some-file-name.rej).
If there are, either you or I have made a mistake.
Unlike patches for the 3.x kernels, patches for the 3.x.y kernels
(also known as the -stable kernels) are not incremental but instead apply
directly to the base 3.x kernel. For example, if your base kernel is 3.0
and you want to apply the 3.0.3 patch, you must not first apply the 3.0.1
and 3.0.2 patches. Similarly, if you are running kernel version 3.0.2 and
want to jump to 3.0.3, you must first reverse the 3.0.2 patch (that is,
patch -R) _before_ applying the 3.0.3 patch. You can read more on this in
Documentation/applying-patches.txt
Alternatively, the script patch-kernel can be used to automate this
process. It determines the current kernel version and applies any
patches found.
linux/scripts/patch-kernel linux
The first argument in the command above is the location of the
kernel source. Patches are applied from the current directory, but
an alternative directory can be specified as the second argument.
- Make sure you have no stale .o files and dependencies lying around:
cd linux
make mrproper
You should now have the sources correctly installed.
SOFTWARE REQUIREMENTS
Compiling and running the 3.x kernels requires up-to-date
versions of various software packages. Consult
Documentation/Changes for the minimum version numbers required
and how to get updates for these packages. Beware that using
excessively old versions of these packages can cause indirect
errors that are very difficult to track down, so don't assume that
you can just update packages when obvious problems arise during
build or operation.
BUILD directory for the kernel:
When compiling the kernel, all output files will per default be
stored together with the kernel source code.
Using the option "make O=output/dir" allow you to specify an alternate
place for the output files (including .config).
Example:
kernel source code: /usr/src/linux-3.X
build directory: /home/name/build/kernel
To configure and build the kernel, use:
cd /usr/src/linux-3.X
make O=/home/name/build/kernel menuconfig
make O=/home/name/build/kernel
sudo make O=/home/name/build/kernel modules_install install
Please note: If the 'O=output/dir' option is used, then it must be
used for all invocations of make.
CONFIGURING the kernel:
Do not skip this step even if you are only upgrading one minor
version. New configuration options are added in each release, and
odd problems will turn up if the configuration files are not set up
as expected. If you want to carry your existing configuration to a
new version with minimal work, use "make oldconfig", which will
only ask you for the answers to new questions.
- Alternative configuration commands are:
"make config" Plain text interface.
"make menuconfig" Text based color menus, radiolists & dialogs.
"make nconfig" Enhanced text based color menus.
"make xconfig" X windows (Qt) based configuration tool.
"make gconfig" X windows (Gtk) based configuration tool.
"make oldconfig" Default all questions based on the contents of
your existing ./.config file and asking about
new config symbols.
"make silentoldconfig"
Like above, but avoids cluttering the screen
with questions already answered.
Additionally updates the dependencies.
"make olddefconfig"
Like above, but sets new symbols to their default
values without prompting.
"make defconfig" Create a ./.config file by using the default
symbol values from either arch/$ARCH/defconfig
or arch/$ARCH/configs/${PLATFORM}_defconfig,
depending on the architecture.
"make ${PLATFORM}_defconfig"
Create a ./.config file by using the default
symbol values from
arch/$ARCH/configs/${PLATFORM}_defconfig.
Use "make help" to get a list of all available
platforms of your architecture.
"make allyesconfig"
Create a ./.config file by setting symbol
values to 'y' as much as possible.
"make allmodconfig"
Create a ./.config file by setting symbol
values to 'm' as much as possible.
"make allnoconfig" Create a ./.config file by setting symbol
values to 'n' as much as possible.
"make randconfig" Create a ./.config file by setting symbol
values to random values.
"make localmodconfig" Create a config based on current config and
loaded modules (lsmod). Disables any module
option that is not needed for the loaded modules.
To create a localmodconfig for another machine,
store the lsmod of that machine into a file
and pass it in as a LSMOD parameter.
target$ lsmod > /tmp/mylsmod
target$ scp /tmp/mylsmod host:/tmp
host$ make LSMOD=/tmp/mylsmod localmodconfig
The above also works when cross compiling.
"make localyesconfig" Similar to localmodconfig, except it will convert
all module options to built in (=y) options.
You can find more information on using the Linux kernel config tools
in Documentation/kbuild/kconfig.txt.
- NOTES on "make config":
- Having unnecessary drivers will make the kernel bigger, and can
under some circumstances lead to problems: probing for a
nonexistent controller card may confuse your other controllers
- Compiling the kernel with "Processor type" set higher than 386
will result in a kernel that does NOT work on a 386. The
kernel will detect this on bootup, and give up.
- A kernel with math-emulation compiled in will still use the
coprocessor if one is present: the math emulation will just
never get used in that case. The kernel will be slightly larger,
but will work on different machines regardless of whether they
have a math coprocessor or not.
- The "kernel hacking" configuration details usually result in a
bigger or slower kernel (or both), and can even make the kernel
less stable by configuring some routines to actively try to
break bad code to find kernel problems (kmalloc()). Thus you
should probably answer 'n' to the questions for "development",
"experimental", or "debugging" features.
COMPILING the kernel:
- Make sure you have at least gcc 3.2 available.
For more information, refer to Documentation/Changes.
Please note that you can still run a.out user programs with this kernel.
- Do a "make" to create a compressed kernel image. It is also
possible to do "make install" if you have lilo installed to suit the
kernel makefiles, but you may want to check your particular lilo setup first.
To do the actual install, you have to be root, but none of the normal
build should require that. Don't take the name of root in vain.
- If you configured any of the parts of the kernel as `modules', you
will also have to do "make modules_install".
- Verbose kernel compile/build output:
Normally, the kernel build system runs in a fairly quiet mode (but not
totally silent). However, sometimes you or other kernel developers need
to see compile, link, or other commands exactly as they are executed.
For this, use "verbose" build mode. This is done by inserting
"V=1" in the "make" command. E.g.:
make V=1 all
To have the build system also tell the reason for the rebuild of each
target, use "V=2". The default is "V=0".
- Keep a backup kernel handy in case something goes wrong. This is
especially true for the development releases, since each new release
contains new code which has not been debugged. Make sure you keep a
backup of the modules corresponding to that kernel, as well. If you
are installing a new kernel with the same version number as your
working kernel, make a backup of your modules directory before you
do a "make modules_install".
Alternatively, before compiling, use the kernel config option
"LOCALVERSION" to append a unique suffix to the regular kernel version.
LOCALVERSION can be set in the "General Setup" menu.
- In order to boot your new kernel, you'll need to copy the kernel
image (e.g. .../linux/arch/i386/boot/bzImage after compilation)
to the place where your regular bootable kernel is found.
- Booting a kernel directly from a floppy without the assistance of a
bootloader such as LILO, is no longer supported.
If you boot Linux from the hard drive, chances are you use LILO, which
uses the kernel image as specified in the file /etc/lilo.conf. The
kernel image file is usually /vmlinuz, /boot/vmlinuz, /bzImage or
/boot/bzImage. To use the new kernel, save a copy of the old image
and copy the new image over the old one. Then, you MUST RERUN LILO
to update the loading map!! If you don't, you won't be able to boot
the new kernel image.
Reinstalling LILO is usually a matter of running /sbin/lilo.
You may wish to edit /etc/lilo.conf to specify an entry for your
old kernel image (say, /vmlinux.old) in case the new one does not
work. See the LILO docs for more information.
After reinstalling LILO, you should be all set. Shutdown the system,
reboot, and enjoy!
If you ever need to change the default root device, video mode,
ramdisk size, etc. in the kernel image, use the 'rdev' program (or
alternatively the LILO boot options when appropriate). No need to
recompile the kernel to change these parameters.
- Reboot with the new kernel and enjoy.
IF SOMETHING GOES WRONG:
- If you have problems that seem to be due to kernel bugs, please check
the file MAINTAINERS to see if there is a particular person associated
with the part of the kernel that you are having trouble with. If there
isn't anyone listed there, then the second best thing is to mail
them to me (torvalds@linux-foundation.org), and possibly to any other
relevant mailing-list or to the newsgroup.
- In all bug-reports, *please* tell what kernel you are talking about,
how to duplicate the problem, and what your setup is (use your common
sense). If the problem is new, tell me so, and if the problem is
old, please try to tell me when you first noticed it.
- If the bug results in a message like
unable to handle kernel paging request at address C0000010
Oops: 0002
EIP: 0010:XXXXXXXX
eax: xxxxxxxx ebx: xxxxxxxx ecx: xxxxxxxx edx: xxxxxxxx
esi: xxxxxxxx edi: xxxxxxxx ebp: xxxxxxxx
ds: xxxx es: xxxx fs: xxxx gs: xxxx
Pid: xx, process nr: xx
xx xx xx xx xx xx xx xx xx xx
or similar kernel debugging information on your screen or in your
system log, please duplicate it *exactly*. The dump may look
incomprehensible to you, but it does contain information that may
help debugging the problem. The text above the dump is also
important: it tells something about why the kernel dumped code (in
the above example, it's due to a bad kernel pointer). More information
on making sense of the dump is in Documentation/oops-tracing.txt
- If you compiled the kernel with CONFIG_KALLSYMS you can send the dump
as is, otherwise you will have to use the "ksymoops" program to make
sense of the dump (but compiling with CONFIG_KALLSYMS is usually preferred).
This utility can be downloaded from
ftp://ftp.<country>.kernel.org/pub/linux/utils/kernel/ksymoops/ .
Alternatively, you can do the dump lookup by hand:
- In debugging dumps like the above, it helps enormously if you can
look up what the EIP value means. The hex value as such doesn't help
me or anybody else very much: it will depend on your particular
kernel setup. What you should do is take the hex value from the EIP
line (ignore the "0010:"), and look it up in the kernel namelist to
see which kernel function contains the offending address.
To find out the kernel function name, you'll need to find the system
binary associated with the kernel that exhibited the symptom. This is
the file 'linux/vmlinux'. To extract the namelist and match it against
the EIP from the kernel crash, do:
nm vmlinux | sort | less
This will give you a list of kernel addresses sorted in ascending
order, from which it is simple to find the function that contains the
offending address. Note that the address given by the kernel
debugging messages will not necessarily match exactly with the
function addresses (in fact, that is very unlikely), so you can't
just 'grep' the list: the list will, however, give you the starting
point of each kernel function, so by looking for the function that
has a starting address lower than the one you are searching for but
is followed by a function with a higher address you will find the one
you want. In fact, it may be a good idea to include a bit of
"context" in your problem report, giving a few lines around the
interesting one.
If you for some reason cannot do the above (you have a pre-compiled
kernel image or similar), telling me as much about your setup as
possible will help. Please read the REPORTING-BUGS document for details.
- Alternatively, you can use gdb on a running kernel. (read-only; i.e. you
cannot change values or set break points.) To do this, first compile the
kernel with -g; edit arch/i386/Makefile appropriately, then do a "make
clean". You'll also need to enable CONFIG_PROC_FS (via "make config").
After you've rebooted with the new kernel, do "gdb vmlinux /proc/kcore".
You can now use all the usual gdb commands. The command to look up the
point where your system crashed is "l *0xXXXXXXXX". (Replace the XXXes
with the EIP value.)
gdb'ing a non-running kernel currently fails because gdb (wrongly)
disregards the starting offset for which the kernel is compiled.