[PATCH v14 00/39] arm64/sme: Initial support for the Scalable Matrix Extension

[Qian Cai]

On Tue, Apr 19, 2022 at 12:22:08PM +0100, Mark Brown wrote:
> This series provides initial support for the ARMv9 Scalable Matrix
> Extension (SME).  SME takes the approach used for vectors in SVE and
> extends this to provide architectural support for matrix operations.  A
> more detailed overview can be found in [1].

Set CONFIG_ARM64_SME=n fixed a warning while running libhugetlbfs tests.

        /*
         * There are several places where we assume that the order value is sane
         * so bail out early if the request is out of bound.
         */
        if (unlikely(order >= MAX_ORDER)) {
                WARN_ON_ONCE(!(gfp & __GFP_NOWARN));
                return NULL;
        }

 WARNING: CPU: 122 PID: 4025 at mm/page_alloc.c:5383 __alloc_pages
 CPU: 122 PID: 4025 Comm: brk_near_huge Not tainted 5.18.0-rc5-next-20220503 #79
 pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : __alloc_pages
 lr : alloc_pages
 sp : ffff8000505470f0
 x29: ffff8000505470f0 x28: ffff40028b3535c0 x27: 0000000000000000
 x26: 1ffff0000a0a8ea2 x25: ffff800050547510 x24: 0000000000000dc0
 x23: ffff921ddb818000 x22: 000000000000000e x21: 1ffff0000a0a8e28
 x20: 0000000000040dc0 x19: ffffae1848c61ae0 x18: ffffae18357e7d24
 x17: ffffae182fb75778 x16: 1fffe8005166a7d8 x15: 000000000000001a
 x14: 1fffe8005166a7cb x13: 0000000000000004 x12: ffff70000a0a8e03
 x11: 1ffff0000a0a8e02 x10: 00000000f204f1f1 x9 : 000000000000f204
 x8 : dfff800000000000 x7 : 00000000f3000000 x6 : 00000000f3f3f3f3
 x5 : ffff70000a0a8e28 x4 : ffff40028b3535c0 x3 : 0000000000000000
 x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000040dc0
 Call trace:
  __alloc_pages
  alloc_pages
  kmalloc_order
  kmalloc_order_trace
  __kmalloc
  __regset_get
  regset_get_alloc
  fill_thread_core_info
  fill_note_info
  elf_core_dump
  do_coredump
  get_signal
  do_signal
  do_notify_resume
  el0_svc
  el0t_64_sync_handler
  el0t_64_sync
 irq event stamp: 28066
 hardirqs last  enabled at (28065):  _raw_spin_unlock_irqrestore
 hardirqs last disabled at (28066):  el1_dbg
 softirqs last  enabled at (27438):  fpsimd_preserve_current_state
 softirqs last disabled at (27436):  fpsimd_preserve_current_state