linux-kernel - [PATCH v2 8/8] ufs/util.h: Apply new find_last_zero

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Date:   Sun, 6 Dec 2020 15:50:40 +0900
From:   Levi Yun <ppbuk5246@...il.com>
To:     akpm@...ux-foundation.org, yury.norov@...il.com,
        andriy.shevchenko@...ux.intel.com,
        richard.weiyang@...ux.alibaba.com, christian.brauner@...ntu.com,
        arnd@...db.de, jpoimboe@...hat.com, changbin.du@...el.com,
        rdunlap@...radead.org, masahiroy@...nel.org,
        gregkh@...uxfoundation.org, peterz@...radead.org,
        peter.enderborg@...y.com, krzk@...nel.org,
        brendanhiggins@...gle.com, keescook@...omium.org,
        broonie@...nel.org, matti.vaittinen@...rohmeurope.com,
        mhiramat@...nel.org, jpa@....mail.kapsi.fi, nivedita@...m.mit.edu,
        glider@...gle.com, orson.zhai@...soc.com,
        takahiro.akashi@...aro.org, clm@...com, josef@...icpanda.com,
        dsterba@...e.com, dushistov@...l.ru
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-btrfs@...r.kernel.org
Subject: [PATCH v2 8/8] ufs/util.h: Apply new find_last_zero_bit.

Former find_last_zero_bit in ufs makes complie error when we add
find_last_zero_bit in lib/find_bit.c
We remove former find_last_zero_bit in ufs which iterates per char,
And apply new find_last_zero_bit in lib.

Signed-off-by: Levi Yun <ppbuk5246@...il.com>
---
 fs/ufs/util.h | 30 +++---------------------------
 1 file changed, 3 insertions(+), 27 deletions(-)

diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 4931bec1a01c..3024f2076feb 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -413,29 +413,6 @@ static inline unsigned _ubh_find_next_zero_bit_(
 	return (base << uspi->s_bpfshift) + pos - begin;
 } 	
 
-static inline unsigned find_last_zero_bit (unsigned char * bitmap,
-	unsigned size, unsigned offset)
-{
-	unsigned bit, i;
-	unsigned char * mapp;
-	unsigned char map;
-
-	mapp = bitmap + (size >> 3);
-	map = *mapp--;
-	bit = 1 << (size & 7);
-	for (i = size; i > offset; i--) {
-		if ((map & bit) == 0)
-			break;
-		if ((i & 7) != 0) {
-			bit >>= 1;
-		} else {
-			map = *mapp--;
-			bit = 1 << 7;
-		}
-	}
-	return i;
-}
-
 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
 static inline unsigned _ubh_find_last_zero_bit_(
 	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
@@ -453,15 +430,14 @@ static inline unsigned _ubh_find_last_zero_bit_(
 			    size + (uspi->s_bpf - start), uspi->s_bpf)
 			- (uspi->s_bpf - start);
 		size -= count;
-		pos = find_last_zero_bit (ubh->bh[base]->b_data,
-			start, start - count);
-		if (pos > start - count || !size)
+		pos = find_last_zero_bit_le(ubh->bh[base]->b_data, start + 1);
+		if ((pos < start + 1 && pos > start - count) || !size)
 			break;
 		base--;
 		start = uspi->s_bpf;
 	}
 	return (base << uspi->s_bpfshift) + pos - begin;
-} 	
+}
 
 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
 
-- 
2.27.0