1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/common/posix/bitmap.c b/drivers/gpu/nvgpu/common/posix/bitmap.c
index b45838df..f25f6e64 100644
--- a/drivers/gpu/nvgpu/common/posix/bitmap.c
+++ b/drivers/gpu/nvgpu/common/posix/bitmap.c
@@ -29,14 +29,15 @@
 #define BIT_MASK(nr)    (1UL << ((nr) % BITS_PER_LONG))
 #define BIT_WORD(nr)    ((nr) / BITS_PER_LONG)
 
-unsigned long __nvgpu_posix_fls(unsigned long word)
+unsigned long __nvgpu_posix_ffs(unsigned long word)
 {
-        return __builtin_clzl(word);
+        return (__builtin_ffsl(word) - 1) &
+                ((sizeof(unsigned long) * 8UL) - 1UL);
 }
 
-unsigned long __nvgpu_posix_ffs(unsigned long word)
+unsigned long __nvgpu_posix_fls(unsigned long word)
 {
-        return __builtin_ffsl(word);
+        return ((sizeof(unsigned long) * 8UL) - 1UL) - __builtin_clzl(word);
 }
 
 static unsigned long __find_next_bit(const unsigned long *addr,