From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Qian Cai <cai@lca.pw>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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Subject: Re: [PATCH V7] mm/debug: Add tests validating architecture page table helpers
Date: Fri, 25 Oct 2019 12:05:18 +0530 [thread overview]
Message-ID: <5ce5a76c-ea89-c2a1-6665-7d75bce5fb87@arm.com> (raw)
In-Reply-To: <69256008-2235-4AF1-A3BA-0146C82CCB93@lca.pw>
On 10/25/2019 11:22 AM, Qian Cai wrote:
>
>
>> On Oct 24, 2019, at 11:45 PM, Anshuman Khandual <Anshuman.Khandual@arm.com> wrote:
>>
>> Nothing specific. But just tested this with x86 defconfig with relevant configs
>> which are required for this test. Not sure if it involved W=1.
>
> No, it will not. It needs to run like,
>
> make W=1 -j 64 2>/tmp/warns
Ahh, so we explicitly ask for it.
Unfortunately compiler still flags it as an warning. Just wondering why this
is still a problem if the second condition for an OR expression is always false.
Because evaluation still needs to be performed for the first condition anyways,
before arriving at the result.
DESCEND objtool
CALL scripts/atomic/check-atomics.sh
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
CC mm/debug_vm_pgtable.o
In file included from ./arch/x86/include/asm/bug.h:83:0,
from ./include/linux/bug.h:5,
from ./include/linux/mmdebug.h:5,
from ./include/linux/gfp.h:5,
from mm/debug_vm_pgtable.c:13:
mm/debug_vm_pgtable.c: In function ‘get_random_vaddr’:
mm/debug_vm_pgtable.c:314:17: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
(random_vaddr < FIRST_USER_ADDRESS));
^
./include/asm-generic/bug.h:113:25: note: in definition of macro ‘WARN_ON’
int __ret_warn_on = !!(condition); \
^~~~~~~~~
As you mentioned GCC is quite stubborn here. Anyways, lets keep it unchanged.
next prev parent reply other threads:[~2019-10-25 6:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 2:42 [PATCH V7] mm/debug: Add tests validating architecture page table helpers Anshuman Khandual
2019-10-21 2:42 ` Anshuman Khandual
2019-10-22 7:11 ` Christophe Leroy
2019-10-22 11:18 ` Anshuman Khandual
2019-10-24 16:51 ` Qian Cai
2019-10-25 3:46 ` Anshuman Khandual
2019-10-25 5:52 ` Qian Cai
2019-10-25 6:35 ` Anshuman Khandual [this message]
2019-10-25 7:11 ` Christophe Leroy
2019-10-25 8:24 ` Anshuman Khandual
2019-10-25 8:52 ` Christophe Leroy
2019-10-25 10:10 ` Anshuman Khandual
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