linux-kernel - Re: [PATCH 0/5] Minor selftests improvements

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Date:   Tue, 7 Nov 2017 11:13:22 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     X86 ML <x86@...nel.org>, Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 0/5] Minor selftests improvements


* Andy Lutomirski <luto@...nel.org> wrote:

> This improves and robustifies the ldt_gdt test and fixes compiler warnings
> in the protection_keys test.
> 
> Andy Lutomirski (5):
>   selftests/x86/protection_keys: Fix syscall NR redefinition warnings
>   selftests/x86/ldt_gdt: Robustify against set_thread_area() and LAR
>     oddities
>   selftests/x86/ldt_gdt: Add infrastructure to test set_thread_area()
>   selftests/x86/ldt_gdt: Run most existing LDT test cases against the
>     GDT as well
>   selftests/x86/ldt_get: Add a few additional tests for limits
> 
>  tools/testing/selftests/x86/ldt_gdt.c         | 88 +++++++++++++++++++++------
>  tools/testing/selftests/x86/protection_keys.c | 24 ++++++--
>  2 files changed, 88 insertions(+), 24 deletions(-)

I'm still getting this build failure when typing 'make' in tools/testing/selftests/x86:

 gcc -m32 -o /home/mingo/tip/tools/testing/selftests/x86/protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall -no-pie  protection_keys.c -lrt -ldl -lm
 In file included from /usr/include/signal.h:57:0,
                  from protection_keys.c:33:
 protection_keys.c: In function ‘signal_handler’:
 protection_keys.c:253:6: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
   u64 si_pkey;
       ^
 protection_keys.c:253:6: error: expected expression before ‘.’ token

 ...
 Makefile:47: recipe for target '/home/mingo/tip/tools/testing/selftests/x86/protection_keys_32' failed

Plus I'm also getting these warnings even with all your fixes applied:

 gcc -m32 -o /home/mingo/tip/tools/testing/selftests/x86/mpx-mini-test_32 -O2 -g -std=gnu99 -pthread -Wall -no-pie  mpx-mini-test.c -lrt -ldl -lm
 mpx-mini-test.c: In function ‘insn_test_failed’:
 mpx-mini-test.c:1406:3: warning: array subscript is above array bounds [-Warray-bounds]
    printf("bte[1]: %lx\n", bte->contents[1]);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 mpx-mini-test.c:1407:3: warning: array subscript is above array bounds [-Warray-bounds]
    printf("bte[2]: %lx\n", bte->contents[2]);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 mpx-mini-test.c:1408:3: warning: array subscript is above array bounds [-Warray-bounds]
    printf("bte[3]: %lx\n", bte->contents[3]);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks,

	Ingo