Re: [PATCH -rt] revert bh_lru_lock() to preempt_disable()

* Daniel Walker <[email protected]> wrote:

> 	The bh_lru_lock() was set to disable interrupt to protect from 
> IPI's, which are only on SMP . So I don't think it's needed in UP 
> PREEMPT_RT configs.

i agree that this is a problem, but the fix is incorrect. What would be 
the right approach is to convert the PER_CPU bh_lrus to PER_CPU_LOCKED, 
and to use the appropriate primitives to use them. That automatically 
makes this code rt-safe. (it isnt right now)

	Ingo
-
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/

Follow-Ups:
- Re: [PATCH -rt] revert bh_lru_lock() to preempt_disable()
  - From: Daniel Walker <[email protected]>

References:
- [PATCH -rt] revert bh_lru_lock() to preempt_disable()
  - From: Daniel Walker <[email protected]>

Prev by Date: Re: [PATCH -rt] remove redundent checks
Next by Date: Re: [PATCH -rt] scheduling while atomic in fs/file.c
Previous by thread: [PATCH -rt] revert bh_lru_lock() to preempt_disable()
Next by thread: Re: [PATCH -rt] revert bh_lru_lock() to preempt_disable()
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]