[PATCH 12/20] linearize: Use bits_mask() in linearize_bitfield_insert()

[Bart Van Assche <bvanassche@acm.org>]

Replace the open-coded ((1ULL << size) - 1) bitmask expression in
linearize_bitfield_insert() with bits_mask(size).

Avoid undefined 64-bit shift behavior when inserting into a 64-bit
bitfield (size == 64), matching the existing bits_mask(btype->bit_size)
call in the same function.

Fixes: ff5cc9636a30 ("Add a semblance of sanity to structure member accesses.")
Fixes: a8e1df57346c ("bitfield: extract linearize_bitfield_insert()")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 linearize.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linearize.c b/linearize.c
index 1db2d505a7d4..5bdd6119260f 100644
--- a/linearize.c
+++ b/linearize.c
@@ -1003,7 +1003,7 @@ static pseudo_t linearize_bitfield_insert(struct entrypoint *ep,
 {
 	unsigned int shift = ctype->bit_offset;
 	unsigned int size = ctype->bit_size;
-	unsigned long long mask = ((1ULL << size) - 1);
+	unsigned long long mask = bits_mask(size);
 	unsigned long long smask= bits_mask(btype->bit_size);
 
 	val = add_cast(ep, btype, ctype, OP_ZEXT, val);