From: Nathan Chancellor <natechancellor@gmail.com>
To: Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Nathan Chancellor <natechancellor@gmail.com>,
clang-built-linux@googlegroups.com,
intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH] drm/i915: Disable -Wtautological-constant-out-of-range-compare
Date: Mon, 10 Feb 2020 22:08:08 -0700 [thread overview]
Message-ID: <20200211050808.29463-1-natechancellor@gmail.com> (raw)
A recent commit in clang added -Wtautological-compare to -Wall, which is
enabled for i915 so we see the following warning:
../drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:1485:22: warning:
result of comparison of constant 576460752303423487 with expression of
type 'unsigned int' is always false
[-Wtautological-constant-out-of-range-compare]
if (unlikely(remain > N_RELOC(ULONG_MAX)))
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
This warning only happens on x86_64 but that check is relevant for
32-bit x86 so we cannot remove it. -Wtautological-compare on a whole has
good warnings but this one is not really relevant for the kernel because
of all of the different configurations that are used to build the
kernel. When -Wtautological-compare is enabled for the kernel, this
option will remain disabled so do that for i915 now.
Link: https://github.com/ClangBuiltLinux/linux/issues/778
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 38df01c23176..55dbcca179c7 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -21,6 +21,7 @@ subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable)
subdir-ccflags-y += $(call cc-disable-warning, sign-compare)
subdir-ccflags-y += $(call cc-disable-warning, sometimes-uninitialized)
subdir-ccflags-y += $(call cc-disable-warning, initializer-overrides)
+subdir-ccflags-y += $(call cc-disable-warning, tautological-constant-out-of-range-compare)
subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
# Fine grained warnings disable
--
2.25.0
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next reply other threads:[~2020-02-11 5:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 5:08 Nathan Chancellor [this message]
2020-02-11 5:29 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for drm/i915: Disable -Wtautological-constant-out-of-range-compare Patchwork
2020-02-11 6:13 ` [Intel-gfx] [PATCH v2] " Nathan Chancellor
2020-02-11 9:41 ` Michel Dänzer
2020-02-11 20:39 ` Nathan Chancellor
2020-02-12 8:52 ` Michel Dänzer
2020-02-12 17:07 ` Nathan Chancellor
2020-02-12 17:17 ` Michel Dänzer
2020-02-13 14:37 ` Jani Nikula
2020-02-13 21:48 ` Nathan Chancellor
2020-02-13 22:05 ` Jani Nikula
2020-02-13 22:43 ` Nick Desaulniers
2020-02-13 23:27 ` Nathan Chancellor
2020-02-11 6:58 ` [Intel-gfx] ✗ Fi.CI.BAT: failure for drm/i915: Disable -Wtautological-constant-out-of-range-compare (rev2) Patchwork
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200211050808.29463-1-natechancellor@gmail.com \
--to=natechancellor@gmail.com \
--cc=clang-built-linux@googlegroups.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=intel-gfx@lists.freedesktop.org \
--cc=jani.nikula@linux.intel.com \
--cc=joonas.lahtinen@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rodrigo.vivi@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).