linux-kernel - [PATCH 1/5] xtensa: drop dead code from entry.S

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Date:   Mon, 18 Apr 2022 10:12:01 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH 1/5] xtensa: drop dead code from entry.S

KERNEL_STACK_OVERFLOW_CHECK is incomplete and have never been enabled.
Remove it.

Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 arch/xtensa/kernel/entry.S | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 6b6eff658795..3c0b1aac7aba 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -28,15 +28,6 @@
 #include <asm/tlbflush.h>
 #include <variant/tie-asm.h>
 
-/* Unimplemented features. */
-
-#undef KERNEL_STACK_OVERFLOW_CHECK
-
-/* Not well tested.
- *
- * - fast_coprocessor
- */
-
 /*
  * Macro to find first bit set in WINDOWBASE from the left + 1
  *
@@ -350,15 +341,6 @@ KABI_W	_bbsi.l	a2, 3, 1f
 	l32i	a0, a1, PT_AREG0	# restore saved a0
 	wsr	a0, depc
 
-#ifdef KERNEL_STACK_OVERFLOW_CHECK
-
-	/*  Stack overflow check, for debugging  */
-	extui	a2, a1, TASK_SIZE_BITS,XX
-	movi	a3, SIZE??
-	_bge	a2, a3, out_of_stack_panic
-
-#endif
-
 /*
  * This is the common exception handler.
  * We get here from the user exception handler or simply by falling through
-- 
2.30.2