Hi all,
On Mon, Jun 12, 2006 at 08:37:43PM +0200, Andreas Mohr wrote:
> Hi all,
>
> while reviewing 2.6.17-rc6-mm1, I found some places that might
> want to make use of cpu_relax() in order to not block secondary
> pipelines while busy-polling (probably especially useful on SMT CPUs):
Patch no. 3 of 3.
This one is adding a cpu_relax() that already existed in the i386 version.
Any reason this wasn't there, too?
Signed-off-by: Andreas Mohr <[email protected]>
diff -urN linux-2.6.17-rc6-mm2.orig/include/asm-x86_64/apic.h linux-2.6.17-rc6-mm2.my/include/asm-x86_64/apic.h
--- linux-2.6.17-rc6-mm2.orig/include/asm-x86_64/apic.h 2006-06-13 19:28:16.000000000 +0200
+++ linux-2.6.17-rc6-mm2.my/include/asm-x86_64/apic.h 2006-06-13 19:34:08.000000000 +0200
@@ -49,7 +49,8 @@
static __inline__ void apic_wait_icr_idle(void)
{
- while ( apic_read( APIC_ICR ) & APIC_ICR_BUSY );
+ while ( apic_read( APIC_ICR ) & APIC_ICR_BUSY )
+ cpu_relax();
}
static inline void ack_APIC_irq(void)
-
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/
[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]
