John David Anglin c346494ec7 parisc: Restore __ldcw_align for PA-RISC 2.0 processors ... commit 914988e099 upstream. Back in 2005, Kyle McMartin removed the 16-byte alignment for ldcw semaphores on PA 2.0 machines (CONFIG_PA20). This broke spinlocks on pre PA8800 processors. The main symptom was random faults in mmap'd memory (e.g., gcc compilations, etc). Unfortunately, the errata for this ldcw change is lost. The issue is the 16-byte alignment required for ldcw semaphore instructions can only be reduced to natural alignment when the ldcw operation can be handled coherently in cache. Only PA8800 and PA8900 processors actually support doing the operation in cache. Aligning the spinlock dynamically adds two integer instructions to each spinlock. Tested on rp3440, c8000 and a500. Signed-off-by: John David Anglin <dave.anglin@bell.net> Link: https://lore.kernel.org/linux-parisc/6b332788-2227-127f-ba6d-55e99ecf4ed8@bell.net/T/#t Link: https://lore.kernel.org/linux-parisc/20050609050702.GB4641@roadwarrior.mcmartin.ca/ Cc: stable@vger.kernel.org Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-10-10 21:59:09 +02:00
..
boot	parisc: Add missing FORCE prerequisite in Makefile	2021-09-09 12:44:30 +02:00
configs	configs: remove the obsolete CONFIG_INPUT_POLLDEV	2021-09-08 11:50:28 -07:00
include	parisc: Restore __ldcw_align for PA-RISC 2.0 processors	2023-10-10 21:59:09 +02:00
kernel	parisc: irq: Make irq_stack_union static to avoid sparse warning	2023-10-06 13:18:15 +02:00
lib	parisc: Add ioread64_lo_hi() and iowrite64_lo_hi()	2022-02-23 12:03:04 +01:00
math-emu	parisc: math-emu: Fix fall-through warnings	2021-09-01 22:18:18 +02:00
mm	parisc: Fix handling off probe non-access faults	2022-04-08 14:23:56 +02:00
defpalo.conf
install.sh	parisc: Fix "make install" on newer debian releases	2021-12-08 09:04:55 +01:00
Kbuild	parisc: move core-y in arch/parisc/Makefile to arch/parisc/Kbuild	2021-08-30 10:18:25 +02:00
Kconfig	parisc: Allow CONFIG_64BIT with ARCH=parisc	2022-09-23 14:15:48 +02:00
Kconfig.debug	tracing: Refactor TRACE_IRQFLAGS_SUPPORT in Kconfig	2021-08-16 11:37:21 -04:00
Makefile	parisc: Fix KBUILD_IMAGE for self-extracting kernel	2021-12-08 09:04:55 +01:00
nm