From: Heiko Carstens <hca@linux.ibm.com>
Date: Mon, 24 Feb 2025 14:59:08 +0000 (+0100)
Subject: s390/boot: Convert tprot() to extable
X-Git-Tag: v6.15-rc1~113^2~27
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7063bb2900c4de261536f305ffde41732131072a;p=thirdparty%2Fkernel%2Flinux.git

s390/boot: Convert tprot() to extable

Shorten tprot() and use regular EX_TABLE program check handling.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/boot/physmem_info.c b/arch/s390/boot/physmem_info.c
index 72be6453d08c2..99f17efbf7d3e 100644
--- a/arch/s390/boot/physmem_info.c
+++ b/arch/s390/boot/physmem_info.c
@@ -137,31 +137,17 @@ static int diag500_storage_limit(unsigned long *max_physmem_end)
 
 static int tprot(unsigned long addr)
 {
-	unsigned long reg1, reg2;
 	int cc, exception;
-	psw_t old;
 
 	exception = 1;
 	asm volatile(
-		"	mvc	0(16,%[psw_old]),0(%[psw_pgm])\n"
-		"	epsw	%[reg1],%[reg2]\n"
-		"	st	%[reg1],0(%[psw_pgm])\n"
-		"	st	%[reg2],4(%[psw_pgm])\n"
-		"	larl	%[reg1],1f\n"
-		"	stg	%[reg1],8(%[psw_pgm])\n"
 		"	tprot	0(%[addr]),0\n"
-		"	lhi	%[exc],0\n"
-		"1:	mvc	0(16,%[psw_pgm]),0(%[psw_old])\n"
+		"0:	lhi	%[exc],0\n"
+		"1:\n"
 		CC_IPM(cc)
-		: CC_OUT(cc, cc),
-		  [exc] "+d" (exception),
-		  [reg1] "=&d" (reg1),
-		  [reg2] "=&a" (reg2),
-		  "=Q" (get_lowcore()->program_new_psw.addr),
-		  "=Q" (old)
-		: [psw_old] "a" (&old),
-		  [psw_pgm] "a" (&get_lowcore()->program_new_psw),
-		  [addr] "a" (addr)
+		EX_TABLE(0b, 1b)
+		: CC_OUT(cc, cc), [exc] "+d" (exception)
+		: [addr] "a" (addr)
 		: CC_CLOBBER_LIST("memory"));
 	cc = exception ? -EFAULT : CC_TRANSFORM(cc);
 	return cc;