scs: Move scs_overflow_check() out of architecture code

There is nothing architecture-specific about scs_overflow_check() as
it's just a trivial wrapper around scs_corrupted().

For parity with task_stack_end_corrupted(), rename scs_corrupted() to
task_scs_end_corrupted() and call it from schedule_debug() when
CONFIG_SCHED_STACK_END_CHECK_is enabled, which better reflects its
purpose as a debug feature to catch inadvertent overflow of the SCS.
Finally, remove the unused scs_overflow_check() function entirely.

This has absolutely no impact on architectures that do not support SCS
(currently arm64 only).

Tested-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 0 insertions, 18 deletions

diff --git a/arch/arm64/include/asm/scs.h b/arch/arm64/include/asm/scs.h
index d46efdd2060a..eaa2cd92e4c1 100644
--- a/arch/arm64/include/asm/scs.h
+++ b/arch/arm64/include/asm/scs.h
@@ -24,24 +24,6 @@
 	.endm
 #endif /* CONFIG_SHADOW_CALL_STACK */
 
-#else /* __ASSEMBLY__ */
-
-#include <linux/scs.h>
-
-#ifdef CONFIG_SHADOW_CALL_STACK
-
-static inline void scs_overflow_check(struct task_struct *tsk)
-{
-	if (unlikely(scs_corrupted(tsk)))
-		panic("corrupted shadow stack detected inside scheduler\n");
-}
-
-#else /* CONFIG_SHADOW_CALL_STACK */
-
-static inline void scs_overflow_check(struct task_struct *tsk) {}
-
-#endif /* CONFIG_SHADOW_CALL_STACK */
-
 #endif /* __ASSEMBLY __ */
 
 #endif /* _ASM_SCS_H */