Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS
From: Marco Elver <elver@google.com>
Date: 2021-12-21 12:12:05
Also in:
linux-arm-kernel, lkml
On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@linux.dev wrote:
From: Andrey Konovalov <redacted>
[...]
+static inline bool should_skip_init(gfp_t flags)
+{
+ /* Don't skip if a software KASAN mode is enabled. */
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC) ||
+ IS_ENABLED(CONFIG_KASAN_SW_TAGS))
+ return false;
+
+ /* Don't skip, if hardware tag-based KASAN is not enabled. */
+ if (!kasan_hw_tags_enabled())
+ return false;
Why is the IS_ENABLED(CONFIG_KASAN_{GENERIC,SW_TAGS}) check above
required? Isn't kasan_hw_tags_enabled() always false if one of those is
configured?