Re: [PATCH v2 Linux-6.12.y Linux-6.13.y 1/1] selftests/mm: build with -O2

[Greg KH <greg@kroah.com>]

On Tue, Feb 04, 2025 at 01:47:23PM -0800, Yifei Liu wrote:
> From: Kevin Brodsky <kevin.brodsky@arm.com>
> 
> [ Upstream commit 46036188ea1f5266df23a6149dea0df1c77cd1c7 ]
> 
> The mm kselftests are currently built with no optimisation (-O0).  It's
> unclear why, and besides being obviously suboptimal, this also prevents
> the pkeys tests from working as intended.  Let's build all the tests with
> -O2.
> 
> [kevin.brodsky@arm.com: silence unused-result warnings]
>   Link: https://lkml.kernel.org/r/20250107170110.2819685-1-kevin.brodsky@arm.com
> Link: https://lkml.kernel.org/r/20241209095019.1732120-6-kevin.brodsky@arm.com
> Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
> Cc: Aruna Ramakrishna <aruna.ramakrishna@oracle.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Joey Gouly <joey.gouly@arm.com>
> Cc: Keith Lucas <keith.lucas@oracle.com>
> Cc: Ryan Roberts <ryan.roberts@arm.com>
> Cc: Shuah Khan <shuah@kernel.org>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> (cherry picked from commit 46036188ea1f5266df23a6149dea0df1c77cd1c7)
> [Yifei: This commit also fix the failure of pkey_sighandler_tests_64,
> which is also in linux-6.12.y and linux-6.13.y, thus backport this commit]
> Signed-off-by: Yifei Liu <yifei.l.liu@oracle.com>
> ---
>  tools/testing/selftests/mm/Makefile | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
> index 02e1204971b0..c0138cb19705 100644
> --- a/tools/testing/selftests/mm/Makefile
> +++ b/tools/testing/selftests/mm/Makefile
> @@ -33,9 +33,16 @@ endif
>  # LDLIBS.
>  MAKEFLAGS += --no-builtin-rules
>  
> -CFLAGS = -Wall -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES) $(TOOLS_INCLUDES)
> +CFLAGS = -Wall -O2 -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES) $(TOOLS_INCLUDES)
>  LDLIBS = -lrt -lpthread -lm
>  
> +# Some distributions (such as Ubuntu) configure GCC so that _FORTIFY_SOURCE is
> +# automatically enabled at -O1 or above. This triggers various unused-result
> +# warnings where functions such as read() or write() are called and their
> +# return value is not checked. Disable _FORTIFY_SOURCE to silence those
> +# warnings.
> +CFLAGS += -U_FORTIFY_SOURCE
> +
>  TEST_GEN_FILES = cow
>  TEST_GEN_FILES += compaction_test
>  TEST_GEN_FILES += gup_longterm

This does not apply to 6.13 :(