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[209.85.220.65]) by mx.google.com with SMTPS id k16sor823042uao.8.2019.04.18.03.44.20 for (Google Transport Security); Thu, 18 Apr 2019 03:44:20 -0700 (PDT) Received-SPF: pass (google.com: domain of glider@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=GeETOI+n; spf=pass (google.com: domain of glider@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=glider@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=j/effP+5iohMRocuBbn+wU3ZjTEdFsXMtMXgMIyP5mQ=; b=GeETOI+nF6LsuhqqtpSuoChbWH/UskTP93w2FqBAJ8suHcg5eru1GG26pM34rRqRIv B8WSV1vIoO/1nGhFp6RzC7tRx+dg46QqHS/n6VfCLXfkss6Wl+7f6WCCoYzQtCpy+Av9 pK71SoS6mO5cCMQXP104i5sSYKE6Geh5ETamcgF6x60B8GK8filcjyPyvI1JHUkVFbsp MRDJlfZlESNOiFomQ0iE/paycPL/z00zxILDRgJ6z1hxx7TvFI07lkZ5PWG4KQ2p+24S lvWoZBjFQXQxvOE/FjegXCDh94aPaBSMmWJHMZZRUS76gPsOv6u8DX3QMmM3Wley22js 9giQ== X-Google-Smtp-Source: APXvYqwaHpp8DFAXY794irwZcMMDgalNDbI2Y+3MtD4mgFCui2zslWAkxHIQQmiBGvEI1Mqv5l7PN3Bzezpz5W4/g08= X-Received: by 2002:ab0:44e:: with SMTP id 72mr49531989uav.110.1555584260078; Thu, 18 Apr 2019 03:44:20 -0700 (PDT) MIME-Version: 1.0 References: <20190418084119.056416939@linutronix.de> <20190418084254.361284697@linutronix.de> In-Reply-To: <20190418084254.361284697@linutronix.de> From: Alexander Potapenko Date: Thu, 18 Apr 2019 12:44:08 +0200 Message-ID: Subject: Re: [patch V2 14/29] dm bufio: Simplify stack trace retrieval To: Thomas Gleixner Cc: LKML , Josh Poimboeuf , x86@kernel.org, Andy Lutomirski , Steven Rostedt , dm-devel@redhat.com, Mike Snitzer , Alasdair Kergon , Alexey Dobriyan , Andrew Morton , Pekka Enberg , Linux Memory Management List , David Rientjes , Christoph Lameter , Catalin Marinas , Dmitry Vyukov , Andrey Ryabinin , kasan-dev , Mike Rapoport , Akinobu Mita , iommu@lists.linux-foundation.org, Robin Murphy , Christoph Hellwig , Marek Szyprowski , Johannes Thumshirn , David Sterba , Chris Mason , Josef Bacik , linux-btrfs@vger.kernel.org, intel-gfx@lists.freedesktop.org, Joonas Lahtinen , Maarten Lankhorst , dri-devel@lists.freedesktop.org, David Airlie , Jani Nikula , Daniel Vetter , Rodrigo Vivi , linux-arch@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 18, 2019 at 11:06 AM Thomas Gleixner wrote= : > > Replace the indirection through struct stack_trace with an invocation of > the storage array based interface. > > Signed-off-by: Thomas Gleixner > Cc: dm-devel@redhat.com > Cc: Mike Snitzer > Cc: Alasdair Kergon > --- > drivers/md/dm-bufio.c | 15 ++++++--------- > 1 file changed, 6 insertions(+), 9 deletions(-) > > --- a/drivers/md/dm-bufio.c > +++ b/drivers/md/dm-bufio.c > @@ -150,7 +150,7 @@ struct dm_buffer { > void (*end_io)(struct dm_buffer *, blk_status_t); > #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING > #define MAX_STACK 10 > - struct stack_trace stack_trace; > + unsigned int stack_len; > unsigned long stack_entries[MAX_STACK]; > #endif > }; > @@ -232,11 +232,7 @@ static DEFINE_MUTEX(dm_bufio_clients_loc > #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING > static void buffer_record_stack(struct dm_buffer *b) > { > - b->stack_trace.nr_entries =3D 0; > - b->stack_trace.max_entries =3D MAX_STACK; > - b->stack_trace.entries =3D b->stack_entries; > - b->stack_trace.skip =3D 2; > - save_stack_trace(&b->stack_trace); > + b->stack_len =3D stack_trace_save(b->stack_entries, MAX_STACK, 2)= ; As noted in one of similar patches before, can we have an inline comment to indicate what does this "2" stand for? > } > #endif > > @@ -438,7 +434,7 @@ static struct dm_buffer *alloc_buffer(st > adjust_total_allocated(b->data_mode, (long)c->block_size); > > #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING > - memset(&b->stack_trace, 0, sizeof(b->stack_trace)); > + b->stack_len =3D 0; > #endif > return b; > } > @@ -1520,8 +1516,9 @@ static void drop_buffers(struct dm_bufio > DMERR("leaked buffer %llx, hold count %u, list %d= ", > (unsigned long long)b->block, b->hold_count= , i); > #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING > - print_stack_trace(&b->stack_trace, 1); > - b->hold_count =3D 0; /* mark unclaimed to avoid B= UG_ON below */ > + stack_trace_print(b->stack_entries, b->stack_len,= 1); > + /* mark unclaimed to avoid BUG_ON below */ > + b->hold_count =3D 0; > #endif > } > > > --=20 Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Stra=C3=9Fe, 33 80636 M=C3=BCnchen Gesch=C3=A4ftsf=C3=BChrer: Paul Manicle, Halimah DeLaine Prado Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg