kernel/linux.git/arch/arc/include/asm/page.h, branch linux-6.9.y

ARC: mm: Make virt_to_pfn() a static inline

2023-12-05T12:11:37+00:00

Making virt_to_pfn() a static inline taking a strongly typed (const void *) makes the contract of a passing a pointer of that type to the function explicit and exposes any misuse of the macro virt_to_pfn() acting polymorphic and accepting many types such as (void *), (unitptr_t) or (unsigned long) as arguments without warnings. In order to do this we move the virt_to_phys() and below the definition of the __pa() and __va() macros so it compiles. The macro version was also able to do recursive symbol resolution. Signed-off-by: Linus Walleij Signed-off-by: Arnd Bergmann

csky: Cast argument to virt_to_pfn() to (void *)

2023-08-11T02:12:33+00:00

The virt_to_pfn() function takes a (void *) as argument, fix this up to avoid exploiting the unintended polymorphism of virt_to_pfn. Signed-off-by: Linus Walleij Signed-off-by: Guo Ren Signed-off-by: Guo Ren

mm, arch: add generic implementation of pfn_valid() for FLATMEM

2023-02-10T00:51:41+00:00

Every architecture that supports FLATMEM memory model defines its own version of pfn_valid() that essentially compares a pfn to max_mapnr. Use mips/powerpc version implemented as static inline as a generic implementation of pfn_valid() and drop its per-architecture definitions. [rppt@kernel.org: fix the generic pfn_valid()] Link: https://lkml.kernel.org/r/Y9lg7R1Yd931C+y5@kernel.org Link: https://lkml.kernel.org/r/20230129124235.209895-5-rppt@kernel.org Signed-off-by: Mike Rapoport (IBM) Acked-by: Arnd Bergmann Acked-by: Guo Ren [csky] Acked-by: Huacai Chen [LoongArch] Acked-by: Stafford Horne [OpenRISC] Acked-by: Michael Ellerman [powerpc] Reviewed-by: David Hildenbrand Tested-by: Conor Dooley Cc: Brian Cain Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Greg Ungerer Cc: Helge Deller Cc: Huacai Chen Cc: Matt Turner Cc: Max Filippov Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Thomas Bogendoerfer Cc: Vineet Gupta Cc: WANG Xuerui Cc: Yoshinori Sato Signed-off-by: Andrew Morton

ARC: mm: support 4 levels of page tables

2021-08-26T20:43:19+00:00

Acked-by: Mike Rapoport Signed-off-by: Vineet Gupta

ARC: mm: support 3 levels of page tables

2021-08-26T20:43:19+00:00

ARCv2 MMU is software walked and Linux implements 2 levels of paging: pgd/pte. Forthcoming hw will have multiple levels, so this change preps mm code for same. It is also fun to try multi levels even on soft-walked code to ensure generic mm code is robust to handle. overview ________ 2 levels {pgd, pte} : pmd is folded but pmd_* macros are valid and operate on pgd 3 levels {pgd, pmd, pte}: - pud is folded and pud_* macros point to pgd - pmd_* macros operate on actual pmd code changes ____________ 1. #include 2. Define CONFIG_PGTABLE_LEVELS 3 3a. Define PMD_SHIFT, PMD_SIZE, PMD_MASK, pmd_t 3b. Define pmd_val() which actually deals with pmd (pmd_offset(), pmd_index() are provided by generic code) 3c. pmd_alloc_one()/pmd_free() also provided by generic code (pmd_populate/pmd_free already exist) 4. Define pud_none(), pud_bad() macros based on generic pud_val() which internally pertains to pgd now. 4b. define pud_populate() to just setup pgd Acked-by: Mike Rapoport Signed-off-by: Vineet Gupta

ARC: mm: switch pgtable_t back to struct page *

2021-08-26T20:42:42+00:00

So far ARC pgtable_t has not been struct page based to avoid extra page_address() calls involved. However the differences are down to noise and get in the way of using generic code, hence this patch. This also allows us to reuse generic THP depost/withdraw code. There's some additional consideration for PGDIR_SHIFT in 4K page config. Now due to page tables being PAGE_SIZE deep only, the address split can't be really arbitrary. Tested-by: kernel test robot Suggested-by: Mike Rapoport Acked-by: Mike Rapoport Signed-off-by: Vineet Gupta

ARC: mm: non-functional code movement/cleanup

2021-08-24T21:25:48+00:00

Signed-off-by: Vineet Gupta

ARC: mm: Enable STRICT_MM_TYPECHECKS

2021-08-24T21:25:48+00:00

In the past I've refrained from doing this (at least 2 times) due to the slight code bloat due to ABI implications of pte_t etc becoming struct Per ARC ABI, functions return struct via memory and not through register r0, even if the struct would fit in register(s) - caller allocates space on stack and passes the address as first arg (r0), shifting rest of args by one - callee creates return struct in memory (referenced via r0) This time around the code actually shrunk slightly (due to subtle inlining heuristic effects), but still slightly inefficient due to return values passed through memory. That however seems like a small cost compared to maintenance burden given the impending new mmu support for page walk etc Signed-off-by: Vineet Gupta

ARC: mm: PAE: use 40-bit physical page mask

2021-05-10T19:38:59+00:00

32-bit PAGE_MASK can not be used as a mask for physical addresses when PAE is enabled. PAGE_MASK_PHYS must be used for physical addresses instead of PAGE_MASK. Without this, init gets SIGSEGV if pte_modify was called: | potentially unexpected fatal signal 11. | Path: /bin/busybox | CPU: 0 PID: 1 Comm: init Not tainted 5.12.0-rc5-00003-g1e43c377a79f-dirty | Insn could not be fetched | @No matching VMA found | ECR: 0x00040000 EFA: 0x00000000 ERET: 0x00000000 | STAT: 0x80080082 [IE U ] BTA: 0x00000000 | SP: 0x5f9ffe44 FP: 0x00000000 BLK: 0xaf3d4 | LPS: 0x000d093e LPE: 0x000d0950 LPC: 0x00000000 | r00: 0x00000002 r01: 0x5f9fff14 r02: 0x5f9fff20 | ... | Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Signed-off-by: Vladimir Isaev Reported-by: kernel test robot Cc: Vineet Gupta Cc: stable@vger.kernel.org Signed-off-by: Vineet Gupta

arch/arc: add copy_user_page() to to fix build error on ARC

2021-01-05T20:59:40+00:00

fs/dax.c uses copy_user_page() but ARC does not provide that interface, resulting in a build error. Provide copy_user_page() in . ../fs/dax.c: In function 'copy_cow_page_dax': ../fs/dax.c:702:2: error: implicit declaration of function 'copy_user_page'; did you mean 'copy_to_user_page'? [-Werror=implicit-function-declaration] Reported-by: kernel test robot Signed-off-by: Randy Dunlap Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org Cc: Dan Williams #Acked-by: Vineet Gupta # v1 Cc: Andrew Morton Cc: Matthew Wilcox Cc: Jan Kara Cc: linux-fsdevel@vger.kernel.org Cc: linux-nvdimm@lists.01.org #Reviewed-by: Ira Weiny # v2 Signed-off-by: Vineet Gupta