parisc: speed up flush_tlb_all_local with qemu



When started in qemu, we know that qemu will drop all local TLB entries
on any pxtlbe instruction. So, if we detect qemu, replace the whole
flush_tlb_all_local function by one pdtlbe instruction.

Signed-off-by: Helge Deller <deller@gmx.de>

parent 82992fc7

arch/parisc/kernel/pacache.S

+9 −0

Original line number	Diff line number	Diff line
		@@ -174,6 +174,15 @@ fdtdone:

		2: bv %r0(%r2)
		nop

		/*
		* When running in qemu, drop whole flush_tlb_all_local function and
		* replace by one pdtlbe instruction, for which QEMU will drop all
		* local TLB entries.
		*/
		3: pdtlbe %r0(%sr1,%r0)
		bv,n %r0(%r2)
		ALTERNATIVE_CODE(flush_tlb_all_local, 2, ALT_COND_RUN_ON_QEMU, 3b)
		ENDPROC_CFI(flush_tlb_all_local)

		.import cache_info,data