From: Max Filippov <jcmvbkbc@gmail.com>
Date: Mon, 18 Apr 2022 07:14:00 +0000 (-0700)
Subject: xtensa: get rid of stack frame in coprocessor_flush
X-Git-Tag: v5.19-rc1~213^2~13
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=f29cab2906346fa93831376256e01f5a6629f979;p=tomoyo%2Ftomoyo-test1.git

xtensa: get rid of stack frame in coprocessor_flush

coprocessor_flush is an ordinary function, it can use all registers.
Don't reserve stack frame for it and use a7 to preserve a0 around the
context saving call.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---

diff --git a/arch/xtensa/kernel/coprocessor.S b/arch/xtensa/kernel/coprocessor.S
index af11ddaa8c5f..95412409c49e 100644
--- a/arch/xtensa/kernel/coprocessor.S
+++ b/arch/xtensa/kernel/coprocessor.S
@@ -216,10 +216,8 @@ ENDPROC(fast_coprocessor)
 
 ENTRY(coprocessor_flush)
 
-	/* reserve 4 bytes on stack to save a0 */
-	abi_entry(4)
+	abi_entry_default
 
-	s32i	a0, a1, 0
 	movi	a4, .Lcp_regs_jump_table
 	addx8	a4, a3, a4
 	addx4	a3, a3, a4
@@ -227,10 +225,11 @@ ENTRY(coprocessor_flush)
 	beqz	a4, 1f
 	l32i	a3, a3, CP_REGS_TAB_OFFSET
 	add	a2, a2, a3
+	mov	a7, a0
 	callx0	a4
-1:	l32i	a0, a1, 0
-
-	abi_ret(4)
+	mov	a0, a7
+1:
+	abi_ret_default
 
 ENDPROC(coprocessor_flush)