* [PATCH] parisc: Flush ITLB in flush_tlb_all_local() only on split TLB machines
@ 2019-07-20 22:55 Helge Deller
0 siblings, 0 replies; only message in thread
From: Helge Deller @ 2019-07-20 22:55 UTC (permalink / raw)
To: linux-parisc, James Bottomley, John David Anglin
flush_tlb_all_local() flushes the ITLB and DTLB of the CPU.
In case the machine does not have separate ITLBs and DTLBs, use the
alternative functionality to replace the code which flushes the ITLB
with nops while keeping the code which flushes the DTLB.
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S
index ba67893a1d72..df46b0e5a915 100644
--- a/arch/parisc/kernel/pacache.S
+++ b/arch/parisc/kernel/pacache.S
@@ -63,7 +63,7 @@ ENTRY_CFI(flush_tlb_all_local)
/* Flush Instruction Tlb */
- LDREG ITLB_SID_BASE(%r1), %r20
+88: LDREG ITLB_SID_BASE(%r1), %r20
LDREG ITLB_SID_STRIDE(%r1), %r21
LDREG ITLB_SID_COUNT(%r1), %r22
LDREG ITLB_OFF_BASE(%r1), %arg0
@@ -103,6 +103,7 @@ fitonemiddle: /* Loop if LOOP = 1 */
add %r21, %r20, %r20 /* increment space */
fitdone:
+ ALTERNATIVE(88b, fitdone, ALT_COND_NO_SPLIT_TLB, INSN_NOP)
/* Flush Data Tlb */
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2019-07-20 22:56 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-07-20 22:55 [PATCH] parisc: Flush ITLB in flush_tlb_all_local() only on split TLB machines Helge Deller
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).