kernel.git/arch/sparc/mm, branch linux-5.6.y

sparc32: fix page table traversal in srmmu_nocache_init()

2020-05-27T15:48:27Z

commit 0cfc8a8d70dcd51db783e8e87917e02149c71458 upstream. The srmmu_nocache_init() uses __nocache_fix() macro to add an offset to page table entry to access srmmu_nocache_pool. But since sparc32 has only three actual page table levels, pgd, p4d and pud are essentially the same thing and pgd_offset() and p4d_offset() are no-ops, the __nocache_fix() should be done only at PUD level. Remove __nocache_fix() for p4d_offset() and pud_offset() and keep it only for PUD and lower levels. Fixes: c2bc26f7ca1f ("sparc32: use PUD rather than PGD to get PMD in srmmu_nocache_init()") Signed-off-by: Mike Rapoport Cc: David S. Miller Cc: Anatoly Pugachev Cc: Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

sparc32: use PUD rather than PGD to get PMD in srmmu_nocache_init()

2020-05-27T15:48:26Z

commit c2bc26f7ca1ff1165bb6669a7a4cccc20ffd2ced upstream. The kbuild test robot reported the following warning: arch/sparc/mm/srmmu.c: In function 'srmmu_nocache_init': arch/sparc/mm/srmmu.c:300:9: error: variable 'pud' set but not used [-Werror=unused-but-set-variable] 300 | pud_t *pud; This warning is caused by misprint in the page table traversal in srmmu_nocache_init() function which accessed a PMD entry using PGD rather than PUD. Since sparc32 has only 3 page table levels, the PGD and PUD are essentially the same and usage of __nocache_fix() removed the type checking. Use PUD for the consistency and to silence the compiler warning. Fixes: 7235db268a2777bc38 ("sparc32: use pgtable-nopud instead of 4level-fixup") Reported-by: kbuild test robot Signed-off-by: Mike Rapoport Signed-off-by: Andrew Morton Cc: David S. Miller Cc: Anatoly Pugachev Cc: Link: http://lkml.kernel.org/r/20200520132005.GM1059226@linux.ibm.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

2020-01-30T15:36:43Z

Pull sparc updates from David Miller: 1) Add a proper .exit.data section. 2) Fix ipc64_perm type definition, from Arnd Bergmann. 3) Support folded p4d page tables on sparc64, from Mike Rapport. 4) Remove uses of struct timex, also from Arnd Bergmann. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: y2038: sparc: remove use of struct timex sparc64: add support for folded p4d page tables sparc/console: kill off obsolete declarations sparc32: fix struct ipc64_perm type definition sparc32, leon: Stop adding vendor and device id to prom ambapp path components sparc: Add .exit.data section. sparc: remove unneeded uapi/asm/statfs.h

sparc64: add support for folded p4d page tables

2020-01-30T10:14:28Z

Implement primitives necessary for the 4th level folding, add walks of p4d level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h. Signed-off-by: Mike Rapoport Acked-by: David S. Miller Signed-off-by: David S. Miller

sparc32: use pgtable-nopud instead of 4level-fixup

2019-12-05T03:44:15Z

32-bit version of sparc has three-level page tables and can use pgtable-nopud and folding of the upper layers. Replace usage of include/asm-generic/4level-fixup.h with include/asm-generic/pgtable-nopud.h and adjust page table manipulation macros and functions accordingly. Link: http://lkml.kernel.org/r/1572938135-31886-11-git-send-email-rppt@kernel.org Signed-off-by: Mike Rapoport Acked-by: David S. Miller Tested-by: Anatoly Pugachev Cc: Anton Ivanov Cc: Arnd Bergmann Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Helge Deller Cc: "James E.J. Bottomley" Cc: Jeff Dike Cc: "Kirill A. Shutemov" Cc: Mark Salter Cc: Matt Turner Cc: Michal Simek Cc: Peter Rosin Cc: Richard Weinberger Cc: Rolf Eike Beer Cc: Russell King Cc: Russell King Cc: Sam Creasey Cc: Vincent Chen Cc: Vineet Gupta Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: treewide: clarify pgtable_page_{ctor,dtor}() naming

2019-09-26T17:10:44Z

The naming of pgtable_page_{ctor,dtor}() seems to have confused a few people, and until recently arm64 used these erroneously/pointlessly for other levels of page table. To make it incredibly clear that these only apply to the PTE level, and to align with the naming of pgtable_pmd_page_{ctor,dtor}(), let's rename them to pgtable_pte_page_{ctor,dtor}(). These changes were generated with the following shell script: ---- git grep -lw 'pgtable_page_.tor' | while read FILE; do sed -i '{s/pgtable_page_ctor/pgtable_pte_page_ctor/}' $FILE; sed -i '{s/pgtable_page_dtor/pgtable_pte_page_dtor/}' $FILE; done ---- ... with the documentation re-flowed to remain under 80 columns, and whitespace fixed up in macros to keep backslashes aligned. There should be no functional change as a result of this patch. Link: http://lkml.kernel.org/r/20190722141133.3116-1-mark.rutland@arm.com Signed-off-by: Mark Rutland Reviewed-by: Mike Rapoport Acked-by: Geert Uytterhoeven [m68k] Cc: Anshuman Khandual Cc: Matthew Wilcox Cc: Michal Hocko Cc: Yu Zhao Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: remove quicklist page table caches

2019-09-24T22:54:09Z

Patch series "mm: remove quicklist page table caches". A while ago Nicholas proposed to remove quicklist page table caches [1]. I've rebased his patch on the curren upstream and switched ia64 and sh to use generic versions of PTE allocation. [1] https://lore.kernel.org/linux-mm/20190711030339.20892-1-npiggin@gmail.com This patch (of 3): Remove page table allocator "quicklists". These have been around for a long time, but have not got much traction in the last decade and are only used on ia64 and sh architectures. The numbers in the initial commit look interesting but probably don't apply anymore. If anybody wants to resurrect this it's in the git history, but it's unhelpful to have this code and divergent allocator behaviour for minor archs. Also it might be better to instead make more general improvements to page allocator if this is still so slow. Link: http://lkml.kernel.org/r/1565250728-21721-2-git-send-email-rppt@linux.ibm.com Signed-off-by: Nicholas Piggin Signed-off-by: Mike Rapoport Cc: Tony Luck Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm, kprobes: generalize and rename notify_page_fault() as kprobe_page_fault()

2019-07-17T02:23:22Z

Architectures which support kprobes have very similar boilerplate around calling kprobe_fault_handler(). Use a helper function in kprobes.h to unify them, based on the x86 code. This changes the behaviour for other architectures when preemption is enabled. Previously, they would have disabled preemption while calling the kprobe handler. However, preemption would be disabled if this fault was due to a kprobe, so we know the fault was not due to a kprobe handler and can simply return failure. This behaviour was introduced in commit a980c0ef9f6d ("x86/kprobes: Refactor kprobes_fault() like kprobe_exceptions_notify()") [anshuman.khandual@arm.com: export kprobe_fault_handler()] Link: http://lkml.kernel.org/r/1561133358-8876-1-git-send-email-anshuman.khandual@arm.com Link: http://lkml.kernel.org/r/1560420444-25737-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Reviewed-by: Dave Hansen Cc: Michal Hocko Cc: Matthew Wilcox Cc: Mark Rutland Cc: Christophe Leroy Cc: Stephen Rothwell Cc: Andrey Konovalov Cc: Michael Ellerman Cc: Paul Mackerras Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Tony Luck Cc: Fenghua Yu Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Yoshinori Sato Cc: "David S. Miller" Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Andy Lutomirski Cc: Vineet Gupta Cc: James Hogan Cc: Paul Burton Cc: Ralf Baechle Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sparc64: use the generic get_user_pages_fast code

2019-07-12T18:05:44Z

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

Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2019-07-09T04:48:15Z

Pull force_sig() argument change from Eric Biederman: "A source of error over the years has been that force_sig has taken a task parameter when it is only safe to use force_sig with the current task. The force_sig function is built for delivering synchronous signals such as SIGSEGV where the userspace application caused a synchronous fault (such as a page fault) and the kernel responded with a signal. Because the name force_sig does not make this clear, and because the force_sig takes a task parameter the function force_sig has been abused for sending other kinds of signals over the years. Slowly those have been fixed when the oopses have been tracked down. This set of changes fixes the remaining abusers of force_sig and carefully rips out the task parameter from force_sig and friends making this kind of error almost impossible in the future" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (27 commits) signal/x86: Move tsk inside of CONFIG_MEMORY_FAILURE in do_sigbus signal: Remove the signal number and task parameters from force_sig_info signal: Factor force_sig_info_to_task out of force_sig_info signal: Generate the siginfo in force_sig signal: Move the computation of force into send_signal and correct it. signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal signal: Remove the task parameter from force_sig_fault signal: Use force_sig_fault_to_task for the two calls that don't deliver to current signal: Explicitly call force_sig_fault on current signal/unicore32: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from ptrace_break signal/nds32: Remove tsk parameter from send_sigtrap signal/riscv: Remove tsk parameter from do_trap signal/sh: Remove tsk parameter from force_sig_info_fault signal/um: Remove task parameter from send_sigtrap signal/x86: Remove task parameter from send_sigtrap signal: Remove task parameter from force_sig_mceerr signal: Remove task parameter from force_sig signal: Remove task parameter from force_sigsegv ...