leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

x86: numachip: Elide self-IPI ICR polling

Browse Source 
The default self-IPI path polls the ICR to delay sending the IPI until
there is no IPI in progress. This is redundant on x86-86 APICs, since
IPIs are queued. See the AMD64 Architecture Programmer's Manual, vol 2,
p525.

Signed-off-by: Daniel J Blueman <daniel@numascale.com>
Cc: Steffen Persvold <sp@numascale.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link: http://lkml.kernel.org/r/1415089784-28779-2-git-send-email-daniel@numascale.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Daniel J Blueman 2014-11-04 16:29:42 +08:00 committed by Thomas Gleixner
parent 00e7977dd1
commit 25e5a76bae
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/apic/apic_numachip.c
View File

@ -145,7 +145,7 @@ static void numachip_send_IPI_all(int vector)
static void numachip_send_IPI_self(int vector)
{
__default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
apic_write(APIC_SELF_IPI, vector);
}
static int __init numachip_probe(void)