[PATCH 5.14 411/849] crypto: ccree - avoid out-of-range warnings from clang

Greg Kroah-Hartman
2021-11-16T01:37:23Z

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit cfd6fb45cfaf46fa9547421d8da387dc9c7997d4 ]

clang points out inconsistencies in the FIELD_PREP() invocation in
this driver that result from the 'mask' being a 32-bit value:

drivers/crypto/ccree/cc_driver.c:117:18: error: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
cache_params |= FIELD_PREP(mask, val);
^~~~~~~~~~~~~~~~~~~~~
include/linux/bitfield.h:94:3: note: expanded from macro 'FIELD_PREP'
__BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/bitfield.h:52:28: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This does not happen in other places that just pass a constant here.

Work around the warnings by widening the type of the temporary variable.

Fixes: 05c2a705917b ("crypto: ccree - rework cache parameters handling")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Gilad ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/crypto/ccree/cc_driver.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccree/cc_driver.c b/drivers/crypto/ccree/cc_driver.c
index e599ac6dc162a..790fa9058a36d 100644
--- a/drivers/crypto/ccree/cc_driver.c
+++ b/drivers/crypto/ccree/cc_driver.c
@@ -103,7 +103,8 @@ MODULE_DEVICE_TABLE(of, arm_ccree_dev_of_match);
static void init_cc_cache_params(struct cc_drvdata *drvdata)
{
struct device *dev = drvdata_to_dev(drvdata);
- u32 cache_params, ace_const, val, mask;
+ u32 cache_params, ace_const, val;
+ u64 mask;

/* compute CC_AXIM_CACHE_PARAMS */
cache_params = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS));
--
2.33.0