Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch

On Tue, 20 Dec 2005, Arjan van de Ven wrote:

> on x86 the fastpath is the same for both basically.. is there a
> fundamental reason it can't be for ARM?

ARM prior ARM architecture level 6 (which means about 99% of all ARM 
processors in the field currently) cannot do an atomic 
decrement/increment.  It must be done manually with interrupt disabled.

The only truly atomic instruction it has is a swap which lays itself 
pretty well for mutex support.

Nicolas
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

References:
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Zwane Mwaikambo <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: David Woodhouse <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Ingo Molnar <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nicolas Pitre <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nick Piggin <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nicolas Pitre <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nick Piggin <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nicolas Pitre <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nick Piggin <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Nicolas Pitre <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Russell King <[email protected]>
- Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
  - From: Arjan van de Ven <[email protected]>

Prev by Date: Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
Next by Date: Re: [Alsa-devel] 2.6.15-rc6: boot failure in saa7134-alsa.c
Previous by thread: Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
Next by thread: Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
Index(es):
- Date
- Thread

[Index of Archives] [Kernel Newbies] [Netfilter] [Bugtraq] [Photo] [Stuff] [Gimp] [Yosemite News] [MIPS Linux] [ARM Linux] [Linux Security] [Linux RAID] [Video 4 Linux] [Linux for the blind] [Linux Resources]