[PATCH 4/5] powerpc: kcsan: Prevent recursive instrumentation with IRQ save/restores

[Rohan McLure]

Instrumented memory accesses provided by KCSAN will access core-local
memories (which will save and restore IRQs) as well as restoring IRQs
directly. Avoid recursive instrumentation by applying __no_kcsan
annotation to IRQ restore routines.

Signed-off-by: Rohan McLure <rmclure at linux.ibm.com>
---
 arch/powerpc/kernel/irq_64.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/irq_64.c b/arch/powerpc/kernel/irq_64.c
index eb2b380e52a0..3a1e0bffe9e0 100644
--- a/arch/powerpc/kernel/irq_64.c
+++ b/arch/powerpc/kernel/irq_64.c
@@ -97,7 +97,7 @@ static inline bool irq_happened_test_and_clear(u8 irq)
 	return false;
 }
 
-void replay_soft_interrupts(void)
+__no_kcsan void replay_soft_interrupts(void)
 {
 	struct pt_regs regs;
 
@@ -185,7 +185,7 @@ void replay_soft_interrupts(void)
 }
 
 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_KUAP)
-static inline void replay_soft_interrupts_irqrestore(void)
+__no_kcsan static inline void replay_soft_interrupts_irqrestore(void)
 {
 	unsigned long kuap_state = get_kuap();
 
@@ -209,7 +209,7 @@ static inline void replay_soft_interrupts_irqrestore(void)
 #define replay_soft_interrupts_irqrestore() replay_soft_interrupts()
 #endif
 
-notrace void arch_local_irq_restore(unsigned long mask)
+notrace __no_kcsan void arch_local_irq_restore(unsigned long mask)
 {
 	unsigned char irq_happened;
 
-- 
2.37.2