On Thu, Jul 17, 2025 at 07:27:21PM +0500, Sabyrzhan Tasbolatov wrote: > Introduce CONFIG_ARCH_DEFER_KASAN to identify architectures that need > to defer KASAN initialization until shadow memory is properly set up. > > Some architectures (like PowerPC with radix MMU) need to set up their > shadow memory mappings before KASAN can be safely enabled, while others > (like s390, x86, arm) can enable KASAN much earlier or even from the > beginning. > > This option allows us to: > 1. Use static keys only where needed (avoiding overhead) > 2. Use compile-time constants for arch that don't need runtime checks > 3. Maintain optimal performance for both scenarios > > Architectures that need deferred KASAN should select this option. > Architectures that can enable KASAN early will get compile-time > optimizations instead of runtime checks. > > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049 > Signed-off-by: Sabyrzhan Tasbolatov <snovit...@gmail.com> > --- > Changes in v3: > - Introduced CONFIG_ARCH_DEFER_KASAN to control static key usage > --- > lib/Kconfig.kasan | 8 ++++++++ > 1 file changed, 8 insertions(+)
Acked-by: Alexander Gordeev <agord...@linux.ibm.com> # s390
