pm24.git/arch/parisc/kernel/syscall.S, branch v5.6

parisc: Drop LDCW barrier in CAS code when running UP

2019-05-10T19:00:24Z

When running an SMP kernel on a single-CPU machine, we can speed up the CAS code by replacing the LDCW sync barrier with NOP. Signed-off-by: Helge Deller

parisc: Rename LEVEL to PA_ASM_LEVEL to avoid name clash with DRBD code

2019-05-05T22:09:56Z

LEVEL is a very common word, and now after many years it suddenly clashed with another LEVEL define in the DRBD code. Rename it to PA_ASM_LEVEL instead. Reported-by: kbuild test robot Signed-off-by: Helge Deller Cc:

parisc: Use ldcw instruction for SMP spinlock release barrier

2019-05-03T21:47:40Z

There are only a couple of instructions that can function as a memory barrier on parisc. Currently, we use the sync instruction as a memory barrier when releasing a spinlock. However, the ldcw instruction is a better barrier when we have a handy memory location since it operates in the cache on coherent machines. This patch updates the spinlock release code to use ldcw. I also changed the "stw,ma" instructions to "stw" instructions as it is not an adequate barrier. Signed-off-by: John David Anglin Signed-off-by: Helge Deller

parisc: generate uapi header and system call table files

2018-12-10T07:26:04Z

System call table generation script must be run to gener- ate unistd_32/64.h and syscall_table_32/64/c32.h files. This patch will have changes which will invokes the script. This patch will generate unistd_32/64.h and syscall_table- _32/64/c32.h files by the syscall table generation script invoked by parisc/Makefile and the generated files against the removed files must be identical. The generated uapi header file will be included in uapi/- asm/unistd.h and generated system call table header file will be included by kernel/syscall.S file. Signed-off-by: Firoz Khan Acked-by: Helge Deller Signed-off-by: Helge Deller

parisc: Revert "Release spinlocks using ordered store"

2018-11-06T11:03:22Z

This reverts commit d27dfa13b9f77ae7e6ed09d70a0426ed26c1a8f9. Unfortunately, this patch needs to be reverted. We need the full sync barrier and not the limited barrier provided by using an ordered store. The sync ensures that all accesses and cache purge instructions that follow the sync are performed after all such instructions prior the sync instruction have completed executing. The patch breaks the rwlock implementation in glibc. This caused the test-lock application in the libprelude testsuite to hang. With the change reverted, the test runs correctly and the libprelude package builds successfully. Signed-off-by: John David Anglin Signed-off-by: Helge Deller

Merge branch 'xarray' of git://git.infradead.org/users/willy/linux-dax

2018-10-28T18:35:40Z

Pull XArray conversion from Matthew Wilcox: "The XArray provides an improved interface to the radix tree data structure, providing locking as part of the API, specifying GFP flags at allocation time, eliminating preloading, less re-walking the tree, more efficient iterations and not exposing RCU-protected pointers to its users. This patch set 1. Introduces the XArray implementation 2. Converts the pagecache to use it 3. Converts memremap to use it The page cache is the most complex and important user of the radix tree, so converting it was most important. Converting the memremap code removes the only other user of the multiorder code, which allows us to remove the radix tree code that supported it. I have 40+ followup patches to convert many other users of the radix tree over to the XArray, but I'd like to get this part in first. The other conversions haven't been in linux-next and aren't suitable for applying yet, but you can see them in the xarray-conv branch if you're interested" * 'xarray' of git://git.infradead.org/users/willy/linux-dax: (90 commits) radix tree: Remove multiorder support radix tree test: Convert multiorder tests to XArray radix tree tests: Convert item_delete_rcu to XArray radix tree tests: Convert item_kill_tree to XArray radix tree tests: Move item_insert_order radix tree test suite: Remove multiorder benchmarking radix tree test suite: Remove __item_insert memremap: Convert to XArray xarray: Add range store functionality xarray: Move multiorder_check to in-kernel tests xarray: Move multiorder_shrink to kernel tests xarray: Move multiorder account test in-kernel radix tree test suite: Convert iteration test to XArray radix tree test suite: Convert tag_tagged_items to XArray radix tree: Remove radix_tree_clear_tags radix tree: Remove radix_tree_maybe_preload_order radix tree: Remove split/join code radix tree: Remove radix_tree_update_node_t page cache: Finish XArray conversion dax: Convert page fault handlers to XArray ...

parisc: Release spinlocks using ordered store

2018-10-17T06:18:01Z

This patch updates the spin unlock code to use an ordered store with release semanatics. All prior accesses are guaranteed to be performed before an ordered store is performed. Using an ordered store is significantly faster than using the sync memory barrier. Signed-off-by: John David Anglin Signed-off-by: Helge Deller

Update email address

2018-09-30T02:47:48Z

Redirect some older email addresses that are in the git logs. Signed-off-by: Matthew Wilcox

parisc: Update comments in syscall.S regarding wide userland

2018-08-17T14:45:41Z

We do support running 64-bit userspace processes, although there isn't yet full gcc and glibc support. Anyway, fix the comments to reflect the reality. Signed-off-by: Helge Deller

parisc: Fix ptraced 64-bit applications to call 64-bit syscalls

2018-08-17T14:45:31Z

Fix the strace code path to call 64-bit syscalls in case we are executing by a 64-bit application. Signed-off-by: Helge Deller