android_kernel_motorola_sm6225/include
David Fries 6ffc787a44 system timer: fix crash in <100Hz system timer
The kernel has a divide by zero crash when trying to run the system timer
less than 100Hz.  The problem is x/(HZ/USER_HZ) and related.  Now
x*(USER_HZ/HZ) will be used if HZ<USER_HZ.

I'm running the Linux kernel under qemu and went to run a slower system
timer to take less CPU (and battery) on the host.  I found that the kernel
paniced under emulation because of a divide by zero in three places.  Here
is the patch.  The base git was updated today 01-05-2008.  I went for a
20Hz system time by adding config HZ_20 etc to kernel/Kconfig.hz.  With
this patch I verified the system timer by looking at /proc/interrupts.

[akpm@linux-foundation.org: partially clean up the macro maze]
Signed-off-by: David Fries <david@fries.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06 10:41:10 -08:00
..
acpi include/acpi/: Spelling fixes 2008-02-03 17:07:16 +02:00
asm-alpha alpha: fix warning by fixing flush_tlb_kernel_range() 2008-02-05 09:44:22 -08:00
asm-arm add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
asm-avr32 Fix __const_udelay declaration and definition mismatches 2008-02-06 10:41:06 -08:00
asm-blackfin remove mm_{ptov,vtop}() 2008-02-06 10:41:01 -08:00
asm-cris cris: remove unused __dummy, CONST_ADDR and ADDR from bitops.h 2008-02-05 09:44:24 -08:00
asm-frv timerfd: fix remaining architectures 2008-02-05 14:37:15 -08:00
asm-generic remove support for un-needed _extratext section 2008-02-06 10:41:01 -08:00
asm-h8300 remove mm_{ptov,vtop}() 2008-02-06 10:41:01 -08:00
asm-ia64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2008-02-05 10:24:52 -08:00
asm-m32r Fix __const_udelay declaration and definition mismatches 2008-02-06 10:41:06 -08:00
asm-m68k cleanup after APUS removal 2008-02-06 10:41:01 -08:00
asm-m68knommu remove mm_{ptov,vtop}() 2008-02-06 10:41:01 -08:00
asm-mips add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
asm-parisc add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
asm-powerpc scheduled OSS driver removal 2008-02-06 10:41:02 -08:00
asm-ppc add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
asm-s390 taskstats scaled time cleanup 2008-02-06 10:41:00 -08:00
asm-sh Fix __const_udelay declaration and definition mismatches 2008-02-06 10:41:06 -08:00
asm-sparc add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
asm-sparc64 read_current_timer() cleanups 2008-02-06 10:41:02 -08:00
asm-um uml: LDT mutex conversion 2008-02-05 09:44:31 -08:00
asm-v850 remove mm_{ptov,vtop}() 2008-02-06 10:41:01 -08:00
asm-x86 Fix __const_udelay declaration and definition mismatches 2008-02-06 10:41:06 -08:00
asm-xtensa add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
crypto [CRYPTO] api: Include sched.h for cond_resched in scatterwalk.h 2008-01-11 08:16:59 +11:00
keys KEYS: Make request_key() and co fundamentally asynchronous 2007-10-17 08:42:57 -07:00
linux system timer: fix crash in <100Hz system timer 2008-02-06 10:41:10 -08:00
math-emu
media include/media/: Spelling fixes 2008-02-03 17:19:47 +02:00
mtd
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-02-05 10:09:07 -08:00
pcmcia pcmcia: replace kio_addr_t with unsigned int everywhere 2008-02-05 09:44:08 -08:00
rdma RDMA/cma: add support for rdma_migrate_id() 2008-01-25 14:15:32 -08:00
rxrpc
scsi include/scsi/: Spelling fixes 2008-02-03 17:47:00 +02:00
sound [ALSA] version 1.0.16rc2 2008-01-31 17:40:18 +01:00
video Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
xen x86: page.h: make pte_t a union to always include 2008-01-30 13:32:57 +01:00
Kbuild do not export /usr/include/scsi in make headers_install 2007-10-17 08:42:52 -07:00