mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 22:54:05 +08:00
9b12f050c7
These char PCMCIA drivers are buggy[1] and receive only minimal care. It was concluded[2], that we should try to remove most pcmcia drivers completely. Let's start with these char broken one. Note that I also removed a UAPI header: include/uapi/linux/cm4000_cs.h. I found only coccinelle tests mentioning some ioctl constants from that file. But they are not actually used. Anyway, should someone complain, we may reintroduce the header (or its parts). [1] https://lore.kernel.org/all/f41c2765-80e0-48bc-b1e4-8cfd3230fd4a@www.fastmail.com/ [2] https://lore.kernel.org/all/c5b39544-a4fb-4796-a046-0b9be9853787@app.fastmail.com/ Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Cc: "Hyunwoo Kim" <imv4bel@gmail.com> Cc: Harald Welte <laforge@gnumonks.org> Cc: Lubomir Rintel <lkundrak@v3.sk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20230222092302.6348-2-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
3.5 KiB
ReStructuredText
85 lines
3.5 KiB
ReStructuredText
.. _magicnumbers:
|
|
|
|
Linux magic numbers
|
|
===================
|
|
|
|
This file is a registry of magic numbers which are in use. When you
|
|
add a magic number to a structure, you should also add it to this
|
|
file, since it is best if the magic numbers used by various structures
|
|
are unique.
|
|
|
|
It is a **very** good idea to protect kernel data structures with magic
|
|
numbers. This allows you to check at run time whether (a) a structure
|
|
has been clobbered, or (b) you've passed the wrong structure to a
|
|
routine. This last is especially useful --- particularly when you are
|
|
passing pointers to structures via a void * pointer. The tty code,
|
|
for example, does this frequently to pass driver-specific and line
|
|
discipline-specific structures back and forth.
|
|
|
|
The way to use magic numbers is to declare them at the beginning of
|
|
the structure, like so::
|
|
|
|
struct tty_ldisc {
|
|
int magic;
|
|
...
|
|
};
|
|
|
|
Please follow this discipline when you are adding future enhancements
|
|
to the kernel! It has saved me countless hours of debugging,
|
|
especially in the screwy cases where an array has been overrun and
|
|
structures following the array have been overwritten. Using this
|
|
discipline, these cases get detected quickly and safely.
|
|
|
|
Changelog::
|
|
|
|
Theodore Ts'o
|
|
31 Mar 94
|
|
|
|
The magic table is current to Linux 2.1.55.
|
|
|
|
Michael Chastain
|
|
<mailto:mec@shout.net>
|
|
22 Sep 1997
|
|
|
|
Now it should be up to date with Linux 2.1.112. Because
|
|
we are in feature freeze time it is very unlikely that
|
|
something will change before 2.2.x. The entries are
|
|
sorted by number field.
|
|
|
|
Krzysztof G. Baranowski
|
|
<mailto: kgb@knm.org.pl>
|
|
29 Jul 1998
|
|
|
|
Updated the magic table to Linux 2.5.45. Right over the feature freeze,
|
|
but it is possible that some new magic numbers will sneak into the
|
|
kernel before 2.6.x yet.
|
|
|
|
Petr Baudis
|
|
<pasky@ucw.cz>
|
|
03 Nov 2002
|
|
|
|
Updated the magic table to Linux 2.5.74.
|
|
|
|
Fabian Frederick
|
|
<ffrederick@users.sourceforge.net>
|
|
09 Jul 2003
|
|
|
|
|
|
===================== ================ ======================== ==========================================
|
|
Magic Name Number Structure File
|
|
===================== ================ ======================== ==========================================
|
|
PG_MAGIC 'P' pg_{read,write}_hdr ``include/linux/pg.h``
|
|
APM_BIOS_MAGIC 0x4101 apm_user ``arch/x86/kernel/apm_32.c``
|
|
FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h``
|
|
SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h``
|
|
BAYCOM_MAGIC 0x19730510 baycom_state ``drivers/net/baycom_epp.c``
|
|
HDLCDRV_MAGIC 0x5ac6e778 hdlcdrv_state ``include/linux/hdlcdrv.h``
|
|
KV_MAGIC 0x5f4b565f kernel_vars_s ``arch/mips/include/asm/sn/klkernvars.h``
|
|
CODA_MAGIC 0xC0DAC0DA coda_file_info ``fs/coda/coda_fs_i.h``
|
|
YAM_MAGIC 0xF10A7654 yam_port ``drivers/net/hamradio/yam.c``
|
|
CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c``
|
|
QUEUE_MAGIC_FREE 0xf7e1c9a3 queue_entry ``drivers/scsi/arm/queue.c``
|
|
QUEUE_MAGIC_USED 0xf7e1cc33 queue_entry ``drivers/scsi/arm/queue.c``
|
|
NMI_MAGIC 0x48414d4d455201 nmi_s ``arch/mips/include/asm/sn/nmi.h``
|
|
===================== ================ ======================== ==========================================
|