[PATCH v5 06/15] arch/arm: don't initialize kasan if it's disabled

[Baoquan He]

Here, kasan is disabled if specified 'kasan=off' in kernel cmdline.

And also call jump_label_init() early in setup_arch() so that later
kasan_init() can enable static key kasan_flag_enabled. Put
jump_label_init() beofre parse_early_param() as other architectures
do.

Signed-off-by: Baoquan He <bhe at redhat.com>
Cc: linux-arm-kernel at lists.infradead.org
---
 arch/arm/kernel/setup.c  | 6 ++++++
 arch/arm/mm/kasan_init.c | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 0bfd66c7ada0..453a47a4c715 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1135,6 +1135,12 @@ void __init setup_arch(char **cmdline_p)
 	early_fixmap_init();
 	early_ioremap_init();
 
+	/*
+	 * Initialise the static keys early as they may be enabled by the
+	 * kasan_init() or early parameters.
+	 */
+	jump_label_init();
+
 	parse_early_param();
 
 #ifdef CONFIG_MMU
diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index c6625e808bf8..82ec043c891f 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -212,6 +212,9 @@ void __init kasan_init(void)
 	phys_addr_t pa_start, pa_end;
 	u64 i;
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
 	/*
 	 * We are going to perform proper setup of shadow memory.
 	 *
-- 
2.52.0