John David Anglin edeccce85c 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 22:00:45 +02:00
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boot	…
configs	…
include	parisc: Restore __ldcw_align for PA-RISC 2.0 processors	2023-10-10 22:00:45 +02:00
kernel	parisc: Fix crash with nr_cpus=1 option	2023-10-10 22:00:44 +02:00
lib	parisc: Drop homebrewn io[read|write]64_[lo_hi|hi_lo]	2022-09-23 21:52:27 +02:00
math-emu	…
mm	parisc: fix expand_stack() conversion	2023-07-01 13:16:26 +02:00
Kbuild	…
Kconfig	parisc: Enable LOCKDEP support	2023-05-30 14:03:18 +01:00
Kconfig.debug	…
Makefile	kbuild: remove head-y syntax	2022-10-02 18:06:03 +09:00
defpalo.conf	…
install.sh	…