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Kasan is gving a warning for passing a u32 parameter into find_first_bit (casting to a unsigned long *, with appropriate length restrictions): [ 44.678262] BUG: KASAN: stack-out-of-bounds in find_first_bit+0x2e/0x50 [ 44.678295] Read of size 8 at addr ffff888233f4fc30 by task core_hotunplug/474 [ 44.678326] [ 44.678358] CPU: 0 PID: 474 Comm: core_hotunplug Not tainted 5.9.0+ #608 [ 44.678465] Hardware name: BESSTAR (HK) LIMITED GN41/Default string, BIOS BLT-BI-MINIPC-F4G-EX3R110-GA65A-101-D 10/12/2018 [ 44.678500] Call Trace: [ 44.678534] dump_stack+0x84/0xba [ 44.678569] print_address_description.constprop.0+0x21/0x220 [ 44.678605] ? kmsg_dump_rewind_nolock+0x5f/0x5f [ 44.678638] ? _raw_spin_lock_irqsave+0x6d/0xb0 [ 44.678669] ? _raw_write_lock_irqsave+0xb0/0xb0 [ 44.678702] ? set_task_cpu+0x1e0/0x1e0 [ 44.678733] ? find_first_bit+0x2e/0x50 [ 44.678763] kasan_report.cold+0x20/0x42 [ 44.678794] ? find_first_bit+0x2e/0x50 [ 44.678825] __asan_load8+0x69/0x90 [ 44.678856] find_first_bit+0x2e/0x50 [ 44.679027] __caps_show.isra.0+0x9e/0x1f0 [i915] Since we are only using the shorter type for our own convenience, accommodate kasan and use unsigned long. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201013110845.16127-1-chris@chris-wilson.co.uk
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.