lkml.org 
[lkml]   [2021]   [Sep]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v1 6/6] bitfield: build kunit tests without structleak plugin
On Fri, Sep 17, 2021 at 12:22 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Fri, Sep 17, 2021 at 8:11 AM Brendan Higgins
> <brendanhiggins@google.com> wrote:
> >
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > The structleak plugin causes the stack frame size to grow immensely:
> >
> > lib/bitfield_kunit.c: In function 'test_bitfields_constants':
> > lib/bitfield_kunit.c:93:1: error: the frame size of 7440 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
> >
> > Turn it off in this file.
> >
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> > ---
> > lib/Makefile | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/lib/Makefile b/lib/Makefile
> > index 5efd1b435a37c..c93c4b59af969 100644
> > --- a/lib/Makefile
> > +++ b/lib/Makefile
> > @@ -351,7 +351,7 @@ obj-$(CONFIG_OBJAGG) += objagg.o
> > obj-$(CONFIG_PLDMFW) += pldmfw/
> >
> > # KUnit tests
> > -CFLAGS_bitfield_kunit.o := $(call cc-option,-Wframe-larger-than=10240)
> > +CFLAGS_bitfield_kunit.o := $(call cc-option,-Wframe-larger-than=10240) $(DISABLE_STRUCTLEAK_PLUGIN)
>
> I think the $(call cc-option,-Wframe-larger-than=10240) needs to be dropped
> here. This was not in my original patch and it is definitely broken on

Ah, someone else put that there, so I just left it, but I can drop it.

> all architectures
> with 8KB stack size or less if the function needs that much. What is the amount
> of actual stack usage you observe without this?

Well STRUCTLEAK claims 7440 bytes, but I don't entirely believe that.
Regardless, it is definitely less than 8KB.

> If we still get a warning, then
> I think this needs to be fixed in the code.
>
> Arnd

Cheers

\
 
 \ /
  Last update: 2021-09-29 23:05    [W:0.075 / U:1.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site