Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a22fb7ff authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[S390] find bit corner case. 



Fix [ext2_]find_first_[zero_]bit for the corner case of an all clear
or all set bit field by always handling that last word of the bit field
with __ffz_word/__ffs_word.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 03513bcc

include/asm-s390/bitops.h

+12 −8
Original line number Diff line number Diff line
@@ -456,16 +456,18 @@ static inline unsigned long __ffz_word_loop(const unsigned long *addr, 


	asm volatile(

#ifndef __s390x__

		"	ahi	%1,31\n"

		"	srl	%1,5\n"

		"	ahi	%1,-1\n"

		"	sra	%1,5\n"

		"	jz	1f\n"

		"0:	c	%2,0(%0,%3)\n"

		"	jne	1f\n"

		"	la	%0,4(%0)\n"

		"	brct	%1,0b\n"

		"1:\n"

#else

		"	aghi	%1,63\n"

		"	srlg	%1,%1,6\n"

		"	aghi	%1,-1\n"

		"	srag	%1,%1,6\n"

		"	jz	1f\n"

		"0:	cg	%2,0(%0,%3)\n"

		"	jne	1f\n"

		"	la	%0,8(%0)\n"
@@ -491,16 +493,18 @@ static inline unsigned long __ffs_word_loop(const unsigned long *addr, 


	asm volatile(

#ifndef __s390x__

		"	ahi	%1,31\n"

		"	srl	%1,5\n"

		"	ahi	%1,-1\n"

		"	sra	%1,5\n"

		"	jz	1f\n"

		"0:	c	%2,0(%0,%3)\n"

		"	jne	1f\n"

		"	la	%0,4(%0)\n"

		"	brct	%1,0b\n"

		"1:\n"

#else

		"	aghi	%1,63\n"

		"	srlg	%1,%1,6\n"

		"	aghi	%1,-1\n"

		"	srag	%1,%1,6\n"

		"	jz	1f\n"

		"0:	cg	%2,0(%0,%3)\n"

		"	jne	1f\n"

		"	la	%0,8(%0)\n"