tools: sync find_next_bit implementation

Sync the implementation with recent kernel changes.

Link: https://lkml.kernel.org/r/20210401003153.97325-9-yury.norov@gmail.com
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Alexey Klimov <aklimov@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Sterba <dsterba@suse.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jianpeng Ma <jianpeng.ma@intel.com>
Cc: Joe Perches <joe@perches.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Stefano Brivio <sbrivio@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: Yoshinori Sato <ysato@users.osdn.me>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/tools/include/asm-generic/bitops/find.h b/tools/include/asm-generic/bitops/find.h
index 16ed198..9fe62d1 100644 (file)
--- a/tools/include/asm-generic/bitops/find.h
+++ b/tools/include/asm-generic/bitops/find.h
@@ -2,6 +2,10 @@
 #ifndef _TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_
 #define _TOOLS_LINUX_ASM_GENERIC_BITOPS_FIND_H_
 
+extern unsigned long _find_next_bit(const unsigned long *addr1,
+               const unsigned long *addr2, unsigned long nbits,
+               unsigned long start, unsigned long invert, unsigned long le);
+
 #ifndef find_next_bit
 /**
  * find_next_bit - find the next set bit in a memory region
@@ -12,8 +16,12 @@
  * Returns the bit number for the next set bit
  * If no bits are set, returns @size.
  */
-extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
-               size, unsigned long offset);
+static inline
+unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
+                           unsigned long offset)
+{
+       return _find_next_bit(addr, NULL, size, offset, 0UL, 0);
+}
 #endif
 
 #ifndef find_next_and_bit
@@ -27,13 +35,16 @@ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
  * Returns the bit number for the next set bit
  * If no bits are set, returns @size.
  */
-extern unsigned long find_next_and_bit(const unsigned long *addr1,
+static inline
+unsigned long find_next_and_bit(const unsigned long *addr1,
                const unsigned long *addr2, unsigned long size,
-               unsigned long offset);
+               unsigned long offset)
+{
+       return _find_next_bit(addr1, addr2, size, offset, 0UL, 0);
+}
 #endif
 
 #ifndef find_next_zero_bit
-
 /**
  * find_next_zero_bit - find the next cleared bit in a memory region
  * @addr: The address to base the search on
@@ -43,8 +54,12 @@ extern unsigned long find_next_and_bit(const unsigned long *addr1,
  * Returns the bit number of the next zero bit
  * If no bits are zero, returns @size.
  */
+static inline
 unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
-                                unsigned long offset);
+                                unsigned long offset)
+{
+       return _find_next_bit(addr, NULL, size, offset, ~0UL, 0);
+}
 #endif
 
 #ifndef find_first_bit

diff --git a/tools/lib/find_bit.c b/tools/lib/find_bit.c
index ac37022..589fd2f 100644 (file)
--- a/tools/lib/find_bit.c
+++ b/tools/lib/find_bit.c
@@ -28,11 +28,12 @@
  *    searching it for one bits.
  *  - The optional "addr2", which is anded with "addr1" if present.
  */
-static inline unsigned long _find_next_bit(const unsigned long *addr1,
+unsigned long _find_next_bit(const unsigned long *addr1,
                const unsigned long *addr2, unsigned long nbits,
-               unsigned long start, unsigned long invert)
+               unsigned long start, unsigned long invert, unsigned long le)
 {
-       unsigned long tmp;
+       unsigned long tmp, mask;
+       (void) le;
 
        if (unlikely(start >= nbits))
                return nbits;
@@ -43,7 +44,19 @@ static inline unsigned long _find_next_bit(const unsigned long *addr1,
        tmp ^= invert;
 
        /* Handle 1st word. */
-       tmp &= BITMAP_FIRST_WORD_MASK(start);
+       mask = BITMAP_FIRST_WORD_MASK(start);
+
+       /*
+        * Due to the lack of swab() in tools, and the fact that it doesn't
+        * need little-endian support, just comment it out
+        */
+#if (0)
+       if (le)
+               mask = swab(mask);
+#endif
+
+       tmp &= mask;
+
        start = round_down(start, BITS_PER_LONG);
 
        while (!tmp) {
@@ -57,18 +70,12 @@ static inline unsigned long _find_next_bit(const unsigned long *addr1,
                tmp ^= invert;
        }
 
-       return min(start + __ffs(tmp), nbits);
-}
+#if (0)
+       if (le)
+               tmp = swab(tmp);
 #endif
 
-#ifndef find_next_bit
-/*
- * Find the next set bit in a memory region.
- */
-unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
-                           unsigned long offset)
-{
-       return _find_next_bit(addr, NULL, size, offset, 0UL);
+       return min(start + __ffs(tmp), nbits);
 }
 #endif
 
@@ -105,20 +112,3 @@ unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
        return size;
 }
 #endif
-
-#ifndef find_next_zero_bit
-unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
-                                unsigned long offset)
-{
-       return _find_next_bit(addr, NULL, size, offset, ~0UL);
-}
-#endif
-
-#ifndef find_next_and_bit
-unsigned long find_next_and_bit(const unsigned long *addr1,
-               const unsigned long *addr2, unsigned long size,
-               unsigned long offset)
-{
-       return _find_next_bit(addr1, addr2, size, offset, 0UL);
-}
-#endif