talos-op-linux/arch/sparc/Kconfig, branch master

asm-generic/tlb: rename HAVE_RCU_TABLE_FREE

2020-02-04T03:05:26+00:00

Towards a more consistent naming scheme. [akpm@linux-foundation.org: fix sparc64 Kconfig] Link: http://lkml.kernel.org/r/20200116064531.483522-7-aneesh.kumar@linux.ibm.com Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Aneesh Kumar K.V Cc: Michael Ellerman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush

2020-02-04T03:05:26+00:00

Architectures for which we have hardware walkers of Linux page table should flush TLB on mmu gather batch allocation failures and batch flush. Some architectures like POWER supports multiple translation modes (hash and radix) and in the case of POWER only radix translation mode needs the above TLBI. This is because for hash translation mode kernel wants to avoid this extra flush since there are no hardware walkers of linux page table. With radix translation, the hardware also walks linux page table and with that, kernel needs to make sure to TLB invalidate page walk cache before page table pages are freed. More details in commit d86564a2f085 ("mm/tlb, x86/mm: Support invalidating TLB caches for RCU_TABLE_FREE") The changes to sparc are to make sure we keep the old behavior since we are now removing HAVE_RCU_TABLE_NO_INVALIDATE. The default value for tlb_needs_table_invalidate is to always force an invalidate and sparc can avoid the table invalidate. Hence we define tlb_needs_table_invalidate to false for sparc architecture. Link: http://lkml.kernel.org/r/20200116064531.483522-3-aneesh.kumar@linux.ibm.com Fixes: a46cc7a90fd8 ("powerpc/mm/radix: Improve TLB/PWC flushes") Signed-off-by: Peter Zijlstra (Intel) Acked-by: Michael Ellerman [powerpc] Cc: [4.14+] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sched/rt, sparc: Use CONFIG_PREEMPTION

2019-12-08T13:37:35+00:00

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same functionality which today depends on CONFIG_PREEMPT. Switch the trap code over to use CONFIG_PREEMPTION. [bigeasy: +Kconfig] Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Acked-by: David S. Miller Cc: Linus Torvalds Cc: Peter Zijlstra Cc: sparclinux@vger.kernel.org Link: https://lore.kernel.org/r/20191015191821.11479-20-bigeasy@linutronix.de Signed-off-by: Ingo Molnar

sparc64: disable fast-GUP due to unexplained oopses

2019-10-15T16:56:36+00:00

HAVE_FAST_GUP enables the lockless quick page table walker for simple cases, and is a nice optimization for some random loads that can then use get_user_pages_fast() rather than the more careful page walker. However, for some unexplained reason, it seems to be subtly broken on sparc64. The breakage is only with some compiler versions and some hardware, and nobody seems to have figured out what triggers it, although there's a simple reprodicer for the problem when it does trigger. The problem was introduced with the conversion to the generic GUP code in commit 7b9afb86b632 ("sparc64: use the generic get_user_pages_fast code"), but nothing looks obviously wrong in that conversion. It may be a compiler bug that just hits us with the code reorganization. Or it may be something very specific to sparc64. This disables HAVE_FAST_GUP entirely. That makes things like futexes a bit slower, but at least they work. If we can figure out the trigger, that would be lovely, but it's been three months already.. Link: https://lore.kernel.org/lkml/20190717215956.GA30369@altlinux.org/ Fixes: 7b9afb86b632 ("sparc64: use the generic get_user_pages_fast code") Reported-by: Dmitry V Levin Reported-by: Anatoly Pugachev Requested-by: Meelis Roos Suggested-by: Christoph Hellwig Cc: David Miller Signed-off-by: Linus Torvalds

kbuild: add CONFIG_ASM_MODVERSIONS

2019-08-21T16:14:11+00:00

Add CONFIG_ASM_MODVERSIONS. This allows to remove one if-conditional nesting in scripts/Makefile.build. scripts/Makefile.build is run every time Kbuild descends into a sub-directory. So, I want to avoid $(wildcard ...) evaluation where possible although computing $(wildcard ...) is so cheap that it may not make measurable performance difference. Signed-off-by: Masahiro Yamada Acked-by: Geert Uytterhoeven

docs: admin-guide: add a series of orphaned documents

2019-07-15T14:03:02+00:00

There are lots of documents that belong to the admin-guide but are on random places (most under Documentation root dir). Move them to the admin guide. Signed-off-by: Mauro Carvalho Chehab Acked-by: Alexandre Belloni Acked-by: Bartlomiej Zolnierkiewicz

mm: rename CONFIG_HAVE_GENERIC_GUP to CONFIG_HAVE_FAST_GUP

2019-07-12T18:05:44+00:00

We only support the generic GUP now, so rename the config option to be more clear, and always use the mm/Kconfig definition of the symbol and select it from the arch Kconfigs. Link: http://lkml.kernel.org/r/20190625143715.1689-11-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Khalid Aziz Reviewed-by: Jason Gunthorpe Cc: Andrey Konovalov Cc: Benjamin Herrenschmidt Cc: David Miller Cc: James Hogan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Paul Burton Cc: Paul Mackerras Cc: Ralf Baechle Cc: Rich Felker Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sparc64: use the generic get_user_pages_fast code

2019-07-12T18:05:44+00:00

The sparc64 code is mostly equivalent to the generic one, minus various bugfixes and two arch overrides that this patch adds to pgtable.h. Link: http://lkml.kernel.org/r/20190625143715.1689-10-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Khalid Aziz Cc: David Miller Cc: Andrey Konovalov Cc: Benjamin Herrenschmidt Cc: James Hogan Cc: Jason Gunthorpe Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Paul Burton Cc: Paul Mackerras Cc: Ralf Baechle Cc: Rich Felker Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sparc: remove ARCH_SELECT_MEMORY_MODEL

2019-07-12T18:05:42+00:00

The ARCH_SELECT_MEMORY_MODEL option is enabled only for 64-bit. However, 64-bit configuration also enables ARCH_SPARSEMEM_DEFAULT and there is no ARCH_FLATMEM_ENABLE in arch/sparc/Kconfig. With such settings, the dependencies in mm/Kconfig are always evaluated to SPARSEMEM=y for 64-bit and to FLATMEM=y for 32-bit. The ARCH_SELECT_MEMORY_MODEL option in arch/sparc/Kconfig does not affect anything and can be removed. Link: http://lkml.kernel.org/r/1556740577-4140-4-git-send-email-rppt@linux.ibm.com Signed-off-by: Mike Rapoport Cc: Arnd Bergmann Cc: Christoph Hellwig Cc: "David S. Miller" Cc: Heiko Carstens Cc: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman