drm/i915 adds some extra cflags, namely -Wall, which causes instances of -Wformat-security to appear when building with clang, even though this warning is turned off kernel-wide in the main Makefile:
drivers/gpu/drm/i915/gt/intel_gt.c:983:2: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security] GEM_TRACE("ERROR\n"); ^~~~~~~~~~~~~~~~~~~~ ./drivers/gpu/drm/i915/i915_gem.h:76:24: note: expanded from macro 'GEM_TRACE' #define GEM_TRACE(...) trace_printk(__VA_ARGS__) ^~~~~~~~~~~~~~~~~~~~~~~~~ ./include/linux/kernel.h:369:3: note: expanded from macro 'trace_printk' do_trace_printk(fmt, ##__VA_ARGS__); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./include/linux/kernel.h:383:30: note: expanded from macro 'do_trace_printk' __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ ^~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/gt/intel_gt.c:983:2: note: treat the string as an argument to avoid this
This does not happen with GCC because it does not enable -Wformat-security with -Wall. Disable -Wformat-security within the i915 Makefile so that these warnings do not show up with clang.
Signed-off-by: Tong Zhang ztong0001@gmail.com ---
v2: revise commit message
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 1b62b9f65196..c04e05a3d39f 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -13,6 +13,7 @@ # will most likely get a sudden build breakage... Hopefully we will fix # new warnings before CI updates! subdir-ccflags-y := -Wall -Wextra +subdir-ccflags-y += -Wno-format-security subdir-ccflags-y += -Wno-unused-parameter subdir-ccflags-y += -Wno-type-limits subdir-ccflags-y += -Wno-missing-field-initializers