Messages in this thread | | | Date | Tue, 17 Oct 2023 08:36:43 +0100 | Subject | Re: [PATCH v2] arm64/mm: Hoist synchronization out of set_ptes() loop | From | Ryan Roberts <> |
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On 16/10/2023 18:54, Catalin Marinas wrote: > On Sat, Oct 14, 2023 at 05:15:51AM +0800, kernel test robot wrote: >> kernel test robot noticed the following build warnings: >> >> [auto build test WARNING on arm64/for-next/core] >> [also build test WARNING on arm-perf/for-next/perf arm/for-next kvmarm/next soc/for-next linus/master v6.6-rc5 next-20231013] >> [cannot apply to arm/fixes] >> [If your patch is applied to the wrong git tree, kindly drop us a note. >> And when submitting patch, we suggest to use '--base' as documented in >> https://git-scm.com/docs/git-format-patch#_base_tree_information] >> >> url: https://github.com/intel-lab-lkp/linux/commits/Ryan-Roberts/arm64-mm-Hoist-synchronization-out-of-set_ptes-loop/20231005-231636 >> base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core >> patch link: https://lore.kernel.org/r/20231005140730.2191134-1-ryan.roberts%40arm.com >> patch subject: [PATCH v2] arm64/mm: Hoist synchronization out of set_ptes() loop >> config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20231014/202310140531.BQQwt3NQ-lkp@intel.com/config) >> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) >> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231014/202310140531.BQQwt3NQ-lkp@intel.com/reproduce) >> >> If you fix the issue in a separate patch/commit (i.e. not just a new version of >> the same patch/commit), kindly add following tags >> | Reported-by: kernel test robot <lkp@intel.com> >> | Closes: https://lore.kernel.org/oe-kbuild-all/202310140531.BQQwt3NQ-lkp@intel.com/ >> >> All warnings (new ones prefixed by >>): >> >> In file included from net/ipv4/route.c:66: >> In file included from include/linux/mm.h:29: >> In file included from include/linux/pgtable.h:6: >>>> arch/arm64/include/asm/pgtable.h:344:65: warning: parameter 'addr' set but not used [-Wunused-but-set-parameter] >> 344 | static inline void set_ptes(struct mm_struct *mm, unsigned long addr, >> | ^ >> 1 warning generated. > > Thanks for the report. I think something like below will do (I'll test > and commit as a separate patch, it's not something that Ryan's patch > introduces):
I was actually just trying to repro this and was planning to send out a v3 of my patch. But if you are happy to handle it as you suggest, then I guess you don't need anything further from me?
Thanks, Ryan
> > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 68984ba9ce2a..b19a8aee684c 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -341,8 +341,9 @@ static inline void __sync_cache_and_tags(pte_t pte, unsigned int nr_pages) > mte_sync_tags(pte, nr_pages); > } > > -static inline void set_ptes(struct mm_struct *mm, unsigned long addr, > - pte_t *ptep, pte_t pte, unsigned int nr) > +static inline void set_ptes(struct mm_struct *mm, > + unsigned long __always_unused addr, > + pte_t *ptep, pte_t pte, unsigned int nr) > { > page_table_check_ptes_set(mm, ptep, pte, nr); > __sync_cache_and_tags(pte, nr); > @@ -353,7 +354,6 @@ static inline void set_ptes(struct mm_struct *mm, unsigned long addr, > if (--nr == 0) > break; > ptep++; > - addr += PAGE_SIZE; > pte_val(pte) += PAGE_SIZE; > } > } > @@ -528,7 +528,8 @@ static inline pmd_t pmd_mkdevmap(pmd_t pmd) > #define pud_pfn(pud) ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT) > #define pfn_pud(pfn,prot) __pud(__phys_to_pud_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) > > -static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, > +static inline void __set_pte_at(struct mm_struct *mm, > + unsigned long __always_unused addr, > pte_t *ptep, pte_t pte, unsigned int nr) > { > __sync_cache_and_tags(pte, nr); >
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