linux/arch/parisc
John David Anglin ad4aa06e1d parisc: Add nop instructions after TLB inserts
An excerpt from the PA8800 ERS states:

* The PA8800 violates the seven instruction pipeline rule when performing
  TLB inserts or PxTLBE instructions with the PSW C bit on. The instruction
  will take effect by the 12th instruction after the insert or purge.

I believe we have a problem with handling TLB misses. We don't fill
the pipeline following TLB inserts. As a result, we likely fault again
after returning from the interruption.

The above statement indicates that we need at least seven instructions
after the insert on pre PA8800 processors and we need 12 instructions
on PA8800/PA8900 processors.

Here we add macros and code to provide the required number instructions
after a TLB insert.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Suggested-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
2023-10-30 14:54:41 +01:00
..
boot parisc: Allow building uncompressed Linux kernel 2023-10-30 14:54:40 +01:00
configs arch/*/configs/*defconfig: Replace AUTOFS4_FS by AUTOFS_FS 2023-07-29 14:08:22 -07:00
include parisc: Move parisc_narrow_firmware variable to header file 2023-10-30 14:54:40 +01:00
kernel parisc: Add nop instructions after TLB inserts 2023-10-30 14:54:41 +01:00
lib parisc: ucmpdi2: Fix no previous prototype for '__ucmpdi2' warning 2023-08-10 18:34:05 +02:00
math-emu parisc: math-emu: Avoid compiler warnings with W=1 2023-07-03 18:56:03 +02:00
mm mm: hugetlb: add huge page size param to set_huge_pte_at() 2023-09-29 17:20:47 -07:00
net parisc: Add eBPF JIT compiler glue code and Makefile 2023-08-22 10:24:47 +02:00
video fbdev: Include <linux/fb.h> instead of <asm/fb.h> 2023-05-18 11:06:21 +02:00
defpalo.conf
install.sh kbuild: factor out the common installation code into scripts/install.sh 2022-05-11 21:45:53 +09:00
Kbuild parisc: Wire up eBPF JIT compiler 2023-08-22 10:24:47 +02:00
Kconfig parisc: Allow building uncompressed Linux kernel 2023-10-30 14:54:40 +01:00
Kconfig.debug parisc: Use page table locks only if DEBUG_KERNEL is enabled 2023-08-20 20:23:46 +02:00
Makefile arch/parisc: Implement fb_is_primary_device() under arch/parisc 2023-04-20 10:04:58 +02:00