Re: [PATCH v3 4/4] riscv: Stop emitting preventive sfence.vma for new userspace mappings with Svvptc

kernel test robot
2024-07-11T01:28:14Z

Hi Alexandre,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on linus/master v6.10-rc7]
[cannot apply to next-20240710]
[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/Alexandre-Ghiti/riscv-Add-ISA-extension-parsing-for-Svvptc/20240702-171920
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link: https://lore.kernel.org/r/20240702085034.48395-5-alexghiti%40rivosinc.com
patch subject: [PATCH v3 4/4] riscv: Stop emitting preventive sfence.vma for new userspace mappings with Svvptc
config: riscv-randconfig-001-20240711 (https://download.01.org/0day-ci/archive/20240711/202407110946.e0VNIrJP-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240711/202407110946.e0VNIrJP-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/202407110946.e0VNIrJP-lkp@intel.com/

All errors (new ones prefixed by >>):

In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:30:
In file included from include/linux/pgtable.h:6:
>> arch/riscv/include/asm/pgtable.h:498:1: error: expected statement
}
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set->sig[3] | set->sig[2] |
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set->sig[3] | set->sig[2] |
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:99:4: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
set->sig[1] | set->sig[0]) == 0;
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:101:11: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set->sig[1] | set->sig[0]) == 0;
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set1->sig[3] == set2->sig[3]) &&
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set1->sig[3] == set2->sig[3]) &&
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:115:5: warning: array index 2 is past the end of the array (which contains 1 element) [-Warray-bounds]
(set1->sig[2] == set2->sig[2]) &&
^ ~
include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from include/linux/mm.h:1115:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:

vim +498 arch/riscv/include/asm/pgtable.h

07037db5d479f9 Palmer Dabbelt 2017-07-10 469
07037db5d479f9 Palmer Dabbelt 2017-07-10 470 #define pgd_ERROR(e) \
07037db5d479f9 Palmer Dabbelt 2017-07-10 471 pr_err("%s:%d: bad pgd " PTE_FMT ".\n", __FILE__, __LINE__, pgd_val(e))
07037db5d479f9 Palmer Dabbelt 2017-07-10 472
07037db5d479f9 Palmer Dabbelt 2017-07-10 473
07037db5d479f9 Palmer Dabbelt 2017-07-10 474 /* Commit new configuration to MMU hardware */
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 475) static inline void update_mmu_cache_range(struct vm_fault *vmf,
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 476) struct vm_area_struct *vma, unsigned long address,
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 477) pte_t *ptep, unsigned int nr)
07037db5d479f9 Palmer Dabbelt 2017-07-10 478 {
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 479 asm goto(ALTERNATIVE("nop", "j %l[svvptc]", 0, RISCV_ISA_EXT_SVVPTC, 1)
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 480 : : : : svvptc);
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 481
07037db5d479f9 Palmer Dabbelt 2017-07-10 482 /*
07037db5d479f9 Palmer Dabbelt 2017-07-10 483 * The kernel assumes that TLBs don't cache invalid entries, but
07037db5d479f9 Palmer Dabbelt 2017-07-10 484 * in RISC-V, SFENCE.VMA specifies an ordering constraint, not a
07037db5d479f9 Palmer Dabbelt 2017-07-10 485 * cache flush; it is necessary even after writing invalid entries.
07037db5d479f9 Palmer Dabbelt 2017-07-10 486 * Relying on flush_tlb_fix_spurious_fault would suffice, but
07037db5d479f9 Palmer Dabbelt 2017-07-10 487 * the extra traps reduce performance. So, eagerly SFENCE.VMA.
07037db5d479f9 Palmer Dabbelt 2017-07-10 488 */
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 489) while (nr--)
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 490) local_flush_tlb_page(address + nr * PAGE_SIZE);
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 491
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 492 svvptc:
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 493 /*
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 494 * Svvptc guarantees that the new valid pte will be visible within
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 495 * a bounded timeframe, so when the uarch does not cache invalid
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 496 * entries, we don't have to do anything.
b5bdff9ee1fdca Alexandre Ghiti 2024-07-02 497 */
07037db5d479f9 Palmer Dabbelt 2017-07-10 @498 }
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 499) #define update_mmu_cache(vma, addr, ptep) \
864609c6a0b5f0 Matthew Wilcox (Oracle 2023-08-02 500) update_mmu_cache_range(NULL, vma, addr, ptep, 1)
07037db5d479f9 Palmer Dabbelt 2017-07-10 501

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