gpu: nvgpu: remove use of multichar constants

In gk20a.h, we use these multichar constants
'DONE', '0R32', '0W32'

But these constants fail compilation on some cross-os compilers
Hence remove them by creating a specific MULTICHAR_TAG()

All the User space components also form these constants in similar
fashion

Jira NVGPU-259

Change-Id: Ibe83617a8d15b657e450fdd59dbc171b3d822842
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1576933
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index bf10055a..cf13999a 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -1295,11 +1295,12 @@ static inline unsigned long gk20a_get_gr_idle_timeout(struct gk20a *g)
                 g->gr_idle_timeout_default : ULONG_MAX;
 }
 
+#define MULTICHAR_TAG(a, b, c, d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
 enum BAR0_DEBUG_OPERATION {
         BARO_ZERO_NOP = 0,
-        OP_END = 'DONE',
-        BAR0_READ32 = '0R32',
-        BAR0_WRITE32 = '0W32',
+        OP_END = MULTICHAR_TAG('D', 'O', 'N', 'E'),
+        BAR0_READ32 = MULTICHAR_TAG('0', 'R', '3', '2'),
+        BAR0_WRITE32 = MULTICHAR_TAG('0', 'W', '3', '2'),
 };
 
 struct share_buffer_head {