[Patch Part2 v4 20/33] x86/irq: Use cached IOAPIC entry instead of reading from hardware

Use cached IOAPIC entry instead of reading data from IOAPIC hardware registers to improve performance. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Joerg Roedel Cc: Greg Kroah-Hartman Cc: Bjorn Helgaas Cc: Benjamin Herrenschmidt Cc: Rafael J. Wysocki Cc: Randy

[Patch Part2 v4 20/33] x86/irq: Use cached IOAPIC entry instead of reading from hardware

Use cached IOAPIC entry instead of reading data from IOAPIC hardware registers to improve performance. Signed-off-by: Jiang Liu jiang@linux.intel.com Cc: Konrad Rzeszutek Wilk konrad.w...@oracle.com Cc: Tony Luck tony.l...@intel.com Cc: Joerg Roedel j...@8bytes.org Cc: Greg Kroah-Hartman