arm64: mte: change PR_MTE_TCF_NONE back into an unsigned long

This constant was previously an unsigned long, but was changed
into an int in commit 433c38f40f6a ("arm64: mte: change ASYNC and
SYNC TCF settings into bitfields"). This ended up causing spurious
unsigned-signed comparison warnings in expressions such as:

(x & PR_MTE_TCF_MASK) != PR_MTE_TCF_NONE

Therefore, change it back into an unsigned long to silence these
warnings.

Link: https://linux-review.googlesource.com/id/I07a72310db30227a5b7d789d0b817d78b657c639
Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://lore.kernel.org/r/20211105230829.2254790-1-pcc@google.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h
index 43bd7f7..de45fcd 100644 (file)
--- a/include/uapi/linux/prctl.h
+++ b/include/uapi/linux/prctl.h
@@ -235,7 +235,7 @@ struct prctl_mm_map {
 #define PR_GET_TAGGED_ADDR_CTRL                56
 # define PR_TAGGED_ADDR_ENABLE         (1UL << 0)
 /* MTE tag check fault modes */
-# define PR_MTE_TCF_NONE               0
+# define PR_MTE_TCF_NONE               0UL
 # define PR_MTE_TCF_SYNC               (1UL << 1)
 # define PR_MTE_TCF_ASYNC              (1UL << 2)
 # define PR_MTE_TCF_MASK               (PR_MTE_TCF_SYNC | PR_MTE_TCF_ASYNC)

diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linux/prctl.h
index 43bd7f7..de45fcd 100644 (file)
--- a/tools/include/uapi/linux/prctl.h
+++ b/tools/include/uapi/linux/prctl.h
@@ -235,7 +235,7 @@ struct prctl_mm_map {
 #define PR_GET_TAGGED_ADDR_CTRL                56
 # define PR_TAGGED_ADDR_ENABLE         (1UL << 0)
 /* MTE tag check fault modes */
-# define PR_MTE_TCF_NONE               0
+# define PR_MTE_TCF_NONE               0UL
 # define PR_MTE_TCF_SYNC               (1UL << 1)
 # define PR_MTE_TCF_ASYNC              (1UL << 2)
 # define PR_MTE_TCF_MASK               (PR_MTE_TCF_SYNC | PR_MTE_TCF_ASYNC)