kernel/linux.git/arch/xtensa/include/asm/pgtable.h, branch v6.1.168

mm: remove kern_addr_valid() completely

2024-11-08T15:26:39+00:00

[ Upstream commit e025ab842ec35225b1a8e163d1f311beb9e38ce9 ] Most architectures (except arm64/x86/sparc) simply return 1 for kern_addr_valid(), which is only used in read_kcore(), and it calls copy_from_kernel_nofault() which could check whether the address is a valid kernel address. So as there is no need for kern_addr_valid(), let's remove it. Link: https://lkml.kernel.org/r/20221018074014.185687-1-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Acked-by: Geert Uytterhoeven [m68k] Acked-by: Heiko Carstens [s390] Acked-by: Christoph Hellwig Acked-by: Helge Deller [parisc] Acked-by: Michael Ellerman [powerpc] Acked-by: Guo Ren [csky] Acked-by: Catalin Marinas [arm64] Cc: Alexander Gordeev Cc: Andy Lutomirski Cc: Anton Ivanov Cc: Cc: Borislav Petkov Cc: Christian Borntraeger Cc: Christophe Leroy Cc: Chris Zankel Cc: Dave Hansen Cc: David S. Miller Cc: Dinh Nguyen Cc: Greg Ungerer Cc: H. Peter Anvin Cc: Huacai Chen Cc: Ingo Molnar Cc: Ivan Kokshaysky Cc: James Bottomley Cc: Johannes Berg Cc: Jonas Bonn Cc: Matt Turner Cc: Max Filippov Cc: Michal Simek Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Richard Henderson Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Sven Schnelle Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Cc: Xuerui Wang Cc: Yoshinori Sato Signed-off-by: Andrew Morton Stable-dep-of: 3d5854d75e31 ("fs/proc/kcore.c: allow translation of physical memory addresses") Signed-off-by: Sasha Levin

xtensa: drop definition of PGD_ORDER

2022-07-18T00:14:44+00:00

This is the order of the page table allocation, not the order of a PGD. Since its always hardwired to 0, simply drop it. Link: https://lkml.kernel.org/r/20220703141203.147893-15-rppt@kernel.org Signed-off-by: Mike Rapoport Acked-by: Helge Deller Acked-by: Max Filippov Cc: Arnd Bergmann Cc: Dinh Nguyen Cc: Guo Ren Cc: Huacai Chen Cc: James Bottomley Cc: "Matthew Wilcox (Oracle)" Cc: Thomas Bogendoerfer Cc: Xuerui Wang Signed-off-by: Andrew Morton

xtensa/mm: enable ARCH_HAS_VM_GET_PAGE_PROT

2022-07-18T00:14:39+00:00

This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports standard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT, which looks up a private and static protection_map[] array. Subsequently all __SXXX and __PXXX macros can be dropped which are no longer needed. Link: https://lkml.kernel.org/r/20220711070600.2378316-12-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Cc: Chris Zankel Cc: Guo Ren Cc: Arnd Bergmann Cc: Brian Cain Cc: Catalin Marinas Cc: Christophe Leroy Cc: Christoph Hellwig Cc: Christoph Hellwig Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Heiko Carstens Cc: Huacai Chen Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Jeff Dike Cc: Jonas Bonn Cc: Michael Ellerman Cc: Michal Simek Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Mackerras Cc: Paul Walmsley Cc: Richard Henderson Cc: Rich Felker Cc: Russell King Cc: Sam Ravnborg Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: WANG Xuerui Cc: Will Deacon Cc: Yoshinori Sato Signed-off-by: Andrew Morton

Merge tag 'xtensa-20220325' of https://github.com/jcmvbkbc/linux-xtensa

2022-03-25T16:49:39+00:00

Pull Xtensa updates from Max Filippov: - remove dependency on the compiler's libgcc - allow selection of internal kernel ABI via Kconfig - enable compiler plugins support for gcc-12 or newer - various minor cleanups and fixes * tag 'xtensa-20220325' of https://github.com/jcmvbkbc/linux-xtensa: xtensa: define update_mmu_tlb function xtensa: fix xtensa_wsr always writing 0 xtensa: enable plugin support xtensa: clean up kernel exit assembly code xtensa: rearrange NMI exit path xtensa: merge stack alignment definitions xtensa: fix DTC warning unit_address_format xtensa: fix stop_machine_cpuslocked call in patch_text xtensa: make secondary reset vector support conditional xtensa: add kernel ABI selection to Kconfig xtensa: don't link with libgcc xtensa: add helpers for division, remainder and shifts xtensa: add missing XCHAL_HAVE_WINDOWED check xtensa: use XCHAL_NUM_AREGS as pt_regs::areg size xtensa: rename PT_SIZE to PT_KERNEL_SIZE xtensa: Remove unused early_read_config_byte() et al declarations xtensa: use strscpy to copy strings net: xtensa: use strscpy to copy strings

xtensa: define update_mmu_tlb function

2022-03-22T16:45:09+00:00

Before the commit f9ce0be71d1f ("mm: Cleanup faultaround and finish_fault() codepaths") there was a call to update_mmu_cache in alloc_set_pte that used to invalidate TLB entry caching invalid PTE that caused a page fault. That commit removed that call so now invalid TLB entry survives causing repetitive page faults on the CPU that took the initial fault until that TLB entry is occasionally evicted. This issue is spotted by the xtensa TLB sanity checker. Fix this issue by defining update_mmu_tlb function that flushes TLB entry for the faulting address. Cc: stable@vger.kernel.org # 5.12+ Signed-off-by: Max Filippov

arch: Add pmd_pfn() where it is missing

2022-03-21T16:59:02+00:00

We need to use this function in common code, so define it for architectures and/or configrations that miss it. The result of pmd_pfn() will only be used if TRANSPARENT_HUGEPAGE is enabled, but a function or macro called pmd_pfn() must be defined, even on machines with two level page tables. Signed-off-by: Mike Rapoport Signed-off-by: Matthew Wilcox (Oracle)

mm: define default value for FIRST_USER_ADDRESS

2021-07-01T18:06:02+00:00

Currently most platforms define FIRST_USER_ADDRESS as 0UL duplication the same code all over. Instead just define a generic default value (i.e 0UL) for FIRST_USER_ADDRESS and let the platforms override when required. This makes it much cleaner with reduced code. The default FIRST_USER_ADDRESS here would be skipped in when the given platform overrides its value via . Link: https://lkml.kernel.org/r/1620615725-24623-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Acked-by: Geert Uytterhoeven [m68k] Acked-by: Guo Ren [csky] Acked-by: Stafford Horne [openrisc] Acked-by: Catalin Marinas [arm64] Acked-by: Mike Rapoport Acked-by: Palmer Dabbelt [RISC-V] Cc: Richard Henderson Cc: Vineet Gupta Cc: Catalin Marinas Cc: Will Deacon Cc: Guo Ren Cc: Brian Cain Cc: Geert Uytterhoeven Cc: Michal Simek Cc: Thomas Bogendoerfer Cc: Ley Foon Tan Cc: Jonas Bonn Cc: Stefan Kristiansson Cc: Stafford Horne Cc: "James E.J. Bottomley" Cc: Michael Ellerman Cc: Christophe Leroy Cc: Paul Walmsley Cc: Heiko Carstens Cc: Yoshinori Sato Cc: "David S. Miller" Cc: Jeff Dike Cc: Thomas Gleixner Cc: Chris Zankel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

xtensa: fix pgprot_noncached assumptions

2021-04-04T22:39:03+00:00

pgprot_noncached assumes that cache bypass attribute is represented as zero. This may not always be true. Fix pgprot_noncached definition by adding _PAGE_CA_BYPASS to the result. Signed-off-by: Max Filippov

xtensa: fix TLBTEMP area placement

2020-11-16T10:13:15+00:00

fast_second_level_miss handler for the TLBTEMP area has an assumption that page table directory entry for the TLBTEMP address range is 0. For it to be true the TLBTEMP area must be aligned to 4MB boundary and not share its 4MB region with anything that may use a page table. This is not true currently: TLBTEMP shares space with vmalloc space which results in the following kinds of runtime errors when fast_second_level_miss loads page table directory entry for the vmalloc space instead of fixing up the TLBTEMP area: Unable to handle kernel paging request at virtual address c7ff0e00 pc = d0009275, ra = 90009478 Oops: sig: 9 [#1] PREEMPT CPU: 1 PID: 61 Comm: kworker/u9:2 Not tainted 5.10.0-rc3-next-20201110-00007-g1fe4962fa983-dirty #58 Workqueue: xprtiod xs_stream_data_receive_workfn a00: 90009478 d11e1dc0 c7ff0e00 00000020 c7ff0000 00000001 7f8b8107 00000000 a08: 900c5992 d11e1d90 d0cc88b8 5506e97c 00000000 5506e97c d06c8074 d11e1d90 pc: d0009275, ps: 00060310, depc: 00000014, excvaddr: c7ff0e00 lbeg: d0009275, lend: d0009287 lcount: 00000003, sar: 00000010 Call Trace: xs_stream_data_receive_workfn+0x43c/0x770 process_one_work+0x1a1/0x324 worker_thread+0x1cc/0x3c0 kthread+0x10d/0x124 ret_from_kernel_thread+0xc/0x18 Cc: stable@vger.kernel.org Signed-off-by: Max Filippov

mm: consolidate pte_index() and pte_offset_*() definitions

2020-06-09T16:39:14+00:00

All architectures define pte_index() as (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1) and all architectures define pte_offset_kernel() as an entry in the array of PTEs indexed by the pte_index(). For the most architectures the pte_offset_kernel() implementation relies on the availability of pmd_page_vaddr() that converts a PMD entry value to the virtual address of the page containing PTEs array. Let's move x86 definitions of the PTE accessors to the generic place in and then simply drop the respective definitions from the other architectures. The architectures that didn't provide pmd_page_vaddr() are updated to have that defined. The generic implementation of pte_offset_kernel() can be overridden by an architecture and alpha makes use of this because it has special ordering requirements for its version of pte_offset_kernel(). [rppt@linux.ibm.com: v2] Link: http://lkml.kernel.org/r/20200514170327.31389-11-rppt@kernel.org [rppt@linux.ibm.com: update] Link: http://lkml.kernel.org/r/20200514170327.31389-12-rppt@kernel.org [rppt@linux.ibm.com: update] Link: http://lkml.kernel.org/r/20200514170327.31389-13-rppt@kernel.org [akpm@linux-foundation.org: fix x86 warning] [sfr@canb.auug.org.au: fix powerpc build] Link: http://lkml.kernel.org/r/20200607153443.GB738695@linux.ibm.com Signed-off-by: Mike Rapoport Signed-off-by: Stephen Rothwell Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-10-rppt@kernel.org Signed-off-by: Linus Torvalds