The changes to minmax.h that changed the type check to a signedness
check significantly increased the length of the expansion.
In some cases it has also significantly increased compile type.
This is particularly noticeable for nested expansions.
The fact that _Static_assert() only requires a compile time constant
not a constant expression allows a lot of simplification.
The other thing that complicates the expansion is the necessity of
returning a constant expression from constant arguments (for VLA).
I can only find a handful of places this is done.
Penalising most of the code for these few cases seems 'suboptimal'.
Instead I've added min_const() and max_const() for VLA and static
initialisers, these check the arguments are constant to avoid misuse.
Patch [9] is dependent on the earlier patches.
Patch [10] isn't dependant on them.
Patch [11] depends on both 9 and 10.
David Laight (11):
[1] minmax: Put all the clamp() definitions together
[2] minmax: Use _Static_assert() instead of static_assert()
[3] minmax: Simplify signedness check
[4] minmax: Replace multiple __UNIQUE_ID() by directly using __COUNTER__
[5] minmax: Move the signedness check out of __cmp_once() and
__clamp_once()
[6] minmax: Remove 'constexpr' check from __careful_clamp()
[7] minmax: minmax: Add __types_ok3() and optimise defines with 3
arguments
[8] minmax: Add min_const() and max_const()
[9] tree-wide: minmax: Replace all the uses of max() for array sizes with
max_const().
[10] block: Use a boolean expression instead of max() on booleans
[11] minmax: min() and max() don't need to return constant expressions
block/blk-settings.c | 2 +-
drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 2 +-
drivers/gpu/drm/drm_color_mgmt.c | 4 +-
drivers/input/touchscreen/cyttsp4_core.c | 2 +-
.../net/can/usb/etas_es58x/es58x_devlink.c | 2 +-
fs/btrfs/tree-checker.c | 2 +-
include/linux/minmax.h | 211 ++++++++++--------
lib/vsprintf.c | 4 +-
net/ipv4/proc.c | 2 +-
net/ipv6/proc.c | 2 +-
10 files changed, 127 insertions(+), 106 deletions(-)
--
2.17.1
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
