bcachefs: varint: Avoid left-shift of a negative value

Shifting a negative value left is undefined.

Signed-off-by: Tavian Barnes <tavianator@tavianator.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/varint.c b/fs/bcachefs/varint.c
index cb4f33ed9ab374fbd50bbf74419335564f55df9a..a9ebcd82c60254080c077d7fc4b907fb6634a424 100644 (file)
--- a/fs/bcachefs/varint.c
+++ b/fs/bcachefs/varint.c
@@ -85,7 +85,7 @@ int bch2_varint_encode_fast(u8 *out, u64 v)
 
        if (likely(bytes < 9)) {
                v <<= bytes;
-               v |= ~(~0 << (bytes - 1));
+               v |= ~(~0U << (bytes - 1));
        } else {
                *out++ = 255;
                bytes = 9;