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linux/drivers/char
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Linus Torvalds 26a9a41823 Avoid ICE in get_random_int() with gcc-3.4.5 
Martin Knoblauch reports that trying to build 2.6.30-rc6-git3 with
RHEL4.3 userspace (gcc (GCC) 3.4.5 20051201 (Red Hat 3.4.5-2)) causes an
internal compiler error (ICE):

    drivers/char/random.c: In function `get_random_int':
    drivers/char/random.c:1672: error: unrecognizable insn:
    (insn 202 148 150 0 /scratch/build/linux-2.6.30-rc6-git3/arch/x86/include/asm/tsc.h:23 (set (reg:SI 0 ax [91])
            (subreg:SI (plus:DI (plus:DI (reg:DI 0 ax [88])
                        (subreg:DI (reg:SI 6 bp) 0))
                    (const_int -4 [0xfffffffffffffffc])) 0)) -1 (nil)
        (nil))
    drivers/char/random.c:1672: internal compiler error: in extract_insn, at recog.c:2083

and after some debugging it turns out that it's due to the code trying
to figure out the rough value of the current stack pointer by taking an
address of an uninitialized variable and casting that to an integer.

This is clearly a compiler bug, but it's not worth fighting - while the
current stack kernel pointer might be somewhat hard to predict in user
space, it's also not generally going to change for a lot of the call
chains for a particular process.

So just drop it, and mumble some incoherent curses at the compiler.

Tested-by: Martin Knoblauch <spamtrap@knobisoft.de>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-05-19 11:25:35 -07:00
..
agp Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-04-20 08:42:48 -07:00
hw_random virtio-rng: Remove false BUG for spurious callbacks 2009-04-24 13:28:30 -07:00
ip2 proc tty: switch ip2 to ->proc_fops 2009-04-01 08:59:08 -07:00
ipmi ipmi: add oem message handling 2009-04-21 13:41:48 -07:00
mwave mwave: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:38 -08:00
pcmcia proc tty: switch synclink_cs to ->proc_fops 2009-04-01 08:59:08 -07:00
rio rio: addition has higher precedence than ?: 2009-04-06 14:36:43 -07:00
tpm Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-03-26 11:17:04 -07:00
xilinx_hwicap
.gitignore
amiserial.c proc tty: switch amiserial to ->proc_fops 2009-04-01 08:59:10 -07:00
apm-emulation.c
applicom.c applicom: Auto-load applicom module when device opened. 2009-04-06 14:36:30 -07:00
applicom.h
bfin-otp.c
briq_panel.c
bsr.c trivial: drivers/char/bsr.c: Storage class should be before const qualifier 2009-03-30 15:22:02 +02:00
cd1865.h
ChangeLog
consolemap.c consolemap: indentation & braces disagree - reindent 2009-01-06 15:59:30 -08:00
cp437.uni
cs5535_gpio.c
cyclades.c cyclades: Auto-load cyclades module when device opened. 2009-04-06 14:36:30 -07:00
defkeymap.c_shipped
defkeymap.map
digi1.h
digiFep1.h
digiPCI.h
ds1302.c
ds1620.c
dsp56k.c
dtlk.c
efirtc.c
epca.c trivial: fix an -> a typos in documentation and comments 2009-01-06 11:28:07 +01:00
epca.h
epcaconfig.h
esp.c esp: fix section mismatch warning 2009-04-07 08:31:03 -07:00
generic_nvram.c
generic_serial.c tty: Remove some pointless casts 2009-01-02 10:19:40 -08:00
genrtc.c
hangcheck-timer.c
hpet.c clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
hvc_beat.c powerpc/cell: Use correct types in beat files 2009-01-08 16:25:16 +11:00
hvc_console.c hvc_console: Remove tty->low_latency 2009-01-16 16:15:16 +11:00
hvc_console.h
hvc_irq.c hvc_console: Call free_irq() only if request_irq() was successful 2009-01-13 14:48:01 +11:00
hvc_iseries.c
hvc_iucv.c [S390] hvc_iucv: Provide IUCV z/VM user ID filtering 2009-03-26 15:24:08 +01:00
hvc_rtas.c
hvc_udbg.c
hvc_vio.c
hvc_xen.c
hvcs.c hvc_console: Remove tty->low_latency on pseries backends 2009-03-11 10:44:26 +11:00
hvsi.c hvc_console: Remove tty->low_latency on pseries backends 2009-03-11 10:44:26 +11:00
i8k.c i8k: Add Dell Vostro systems 2009-01-02 10:28:32 -08:00
isicom.c isicom: isicom kref leak fix 2009-04-06 14:36:33 -07:00
istallion.c proc tty: switch istallion to ->proc_fops 2009-04-01 08:59:08 -07:00
Kconfig NVRAM depends on RTC_DRV_CMOS 2009-01-31 01:21:59 +01:00
keyboard.c
lp.c
Makefile
mbcs.c
mbcs.h
mem.c x86, PAT: Remove duplicate memtype reserve in devmem mmap 2009-04-10 13:55:48 +02:00
misc.c
mmtimer.c
moxa.c tty: moxa, fix refcounting in moxa_poll_port 2009-04-06 14:36:33 -07:00
moxa.h
mspec.c
mxser.c mxser: remove tty_port_tty_get from mxser_check_modem_status 2009-04-06 14:36:33 -07:00
mxser.h
n_hdlc.c
n_r3964.c tty: Remove some pointless casts 2009-01-02 10:19:40 -08:00
n_tty.c tty: N_TTY SIGIO only works for read 2009-01-02 10:19:40 -08:00
nozomi.c tty: kref nozomi 2009-01-02 10:19:40 -08:00
nsc_gpio.c
nvram.c
nwbutton.c
nwbutton.h
nwflash.c
pc8736x_gpio.c
ppdev.c
ps3flash.c powerpc/ps3: Printing fixups for l64 to ll64 conversion drivers/char 2009-01-16 16:15:14 +11:00
pty.c pty: Fix documentation 2009-01-12 16:37:00 -08:00
random.c Avoid ICE in get_random_int() with gcc-3.4.5 2009-05-19 11:25:35 -07:00
raw.c Add a missing unlock_kernel() in raw_open() 2009-03-27 10:59:09 -06:00
riscom8_reg.h
riscom8.c riscom8: Auto-load riscom8 module when device opened. 2009-04-06 14:36:31 -07:00
riscom8.h
rocket_int.h tty: rocketport uses different port flags to everyone else 2009-01-02 10:19:39 -08:00
rocket.c tty: use port methods for the rocket driver 2009-01-02 10:19:42 -08:00
rocket.h tty: rocketport uses different port flags to everyone else 2009-01-02 10:19:39 -08:00
rtc.c RTC: Remove the BKL. 2009-01-08 16:44:03 -07:00
scc.h m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
scx200_gpio.c
selection.c Fix memory corruption in console selection 2009-01-31 15:51:31 -08:00
ser_a2232.c m68k: ser_a2232 - Kill warn_unused_result warnings 2009-01-12 20:56:39 +01:00
ser_a2232.h
ser_a2232fw.ax
ser_a2232fw.h
serial167.c tty: Remove some pointless casts 2009-01-02 10:19:40 -08:00
snsc_event.c
snsc.c
snsc.h
sonypi.c Rationalize fasync return values 2009-03-16 08:34:35 -06:00
specialix_io8.h
specialix.c specialix: Auto-load specialix module when device opened. 2009-04-06 14:36:31 -07:00
stallion.c proc tty: switch stallion to ->proc_fops 2009-04-01 08:59:09 -07:00
sx.c sx.c: avoid referencing freed memory if copy_from_user() fails 2009-02-20 17:57:49 -08:00
sx.h
sxboards.h
sxwindow.h
synclink_gt.c synclink_gt: add clock options 2009-04-02 19:05:01 -07:00
synclink.c proc tty: switch synclink to ->proc_fops 2009-04-01 08:59:09 -07:00
synclinkmp.c proc tty: switch synclinkmp to ->proc_fops 2009-04-01 08:59:09 -07:00
sysrq.c sysrq, intel_fb: fix sysrq g collision 2009-05-15 07:56:24 -05:00
tb0219.c
tlclk.c
toshiba.c
tty_audit.c Trim includes of fdtable.h 2009-03-31 23:00:28 -04:00
tty_buffer.c
tty_io.c pids: kill signal_struct-> __pgrp/__session and friends 2009-04-02 19:05:02 -07:00
tty_ioctl.c tty: Fix race in the flush for some ldiscs 2009-01-15 12:48:35 -08:00
tty_ldisc.c Trim includes of fdtable.h 2009-03-31 23:00:28 -04:00
tty_port.c tty: use port methods for the rocket driver 2009-01-02 10:19:42 -08:00
vc_screen.c vcs: hook sysfs devices into object lifetime instead of "binding" 2009-03-24 16:38:26 -07:00
viotape.c
virtio_console.c
vme_scc.c m68k: vme_scc - Kill warn_unused_result warnings 2009-01-12 20:56:38 +01:00
vr41xx_giu.c
vt_ioctl.c vt: Add a note on the historical abuse of CLOCK_TICK_RATE 2009-05-06 14:47:13 -07:00
vt.c Revert "console ASCII glyph 1:1 mapping" 2009-04-19 10:51:40 -07:00