[coreboot-gerrit] Change in coreboot[master]: temporarily silent GCC overflow warning on MCHBARx_AND_OR macro

[HAOUAS Elyes (Code Review)]

Hello build bot (Jenkins), Nico Huber, Patrick Georgi, Martin Roth, Patrick Rudolph,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/42448

to look at the new patch set (#17).

Change subject: temporarily silent GCC overflow warning on MCHBARx_AND_OR macro
......................................................................

temporarily silent GCC overflow warning on MCHBARx_AND_OR macro

GCC-10 highlighted a none reliable MCHBARx_AND_OR macro:

x4x:
src/northbridge/intel/x4x/x4x.h:79:16: error: overflow in conversion from 'int' to 'u8' {aka 'volatile unsigned char'} changes value from '(int)*(volatile u8 *)((unsigned int)((int)i * 1024) + 4275126888) & -256 | 74' to '74' [-Werror=overflow]
   79 |  (MCHBAR8(x) = (MCHBAR8(x) & (and)) | (or))
      |                ^
src/northbridge/intel/x4x/raminit_ddr23.c:627:3: note: in expansion of macro 'MCHBAR8_AND_OR'
  627 |   MCHBAR8_AND_OR(0x400*i + 0x268, ~0xff, 0x4a);
      |   ^~~~~~~~~~~~~~
src/northbridge/intel/x4x/raminit_ddr23.c: In function 'prog_rcomp':
src/northbridge/intel/x4x/x4x.h:83:17: error: overflow in conversion from 'int' to 'u16' {aka 'volatile short unsigned int'} changes value from '(int)*(volatile u16 *)((unsigned int)((int)i * 1024) + 4275127072) & -65536 | 26214' to '26214' [-Werror=overflow]
   83 |  (MCHBAR16(x) = (MCHBAR16(x) & (and)) | (or))
      |                 ^

and for pineview:
src/northbridge/intel/pineview/raminit.c: In function 'sdram_timings':
src/northbridge/intel/pineview/pineview.h:98:52: error: overflow in conversion from 'int' to 'u8' {aka 'volatile unsigned char'} changes value from '(int)*4275126567 & -256 | 64' to '64' [-Werror=overflow]
   98 | #define MCHBAR8_AND_OR(x,  and, or) (MCHBAR8(x)  = (MCHBAR8(x)  & (and)) | (or))
      |                                                    ^
src/northbridge/intel/pineview/raminit.c:793:2: note: in expansion of macro 'MCHBAR8_AND_OR'
  793 |  MCHBAR8_AND_OR(SHPAGECTRL,     ~0xff, 0x40);
      |  ^~~~~~~~~~~~~~

Change-Id: I07c1b3bd00de27c115994233086d32497b4c0925
Signed-off-by: Elyes HAOUAS 
---
M Makefile.inc
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/48/42448/17