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[2a01:7a0:2:106d:700::1]) by mx.google.com with ESMTPS id g62si1085979wmf.93.2019.04.18.02.06.37 for (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 18 Apr 2019 02:06:37 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of tglx@linutronix.de designates 2a01:7a0:2:106d:700::1 as permitted sender) client-ip=2a01:7a0:2:106d:700::1; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of tglx@linutronix.de designates 2a01:7a0:2:106d:700::1 as permitted sender) smtp.mailfrom=tglx@linutronix.de Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1hH303-0001rK-1g; Thu, 18 Apr 2019 11:06:31 +0200 Message-Id: <20190418084254.459090858@linutronix.de> User-Agent: quilt/0.65 Date: Thu, 18 Apr 2019 10:41:34 +0200 From: Thomas Gleixner To: LKML Cc: Josh Poimboeuf , x86@kernel.org, Andy Lutomirski , Steven Rostedt , Alexander Potapenko , dm-devel@redhat.com, Mike Snitzer , Alasdair Kergon , Alexey Dobriyan , Andrew Morton , Pekka Enberg , linux-mm@kvack.org, David Rientjes , Christoph Lameter , Catalin Marinas , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, 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 Subject: [patch V2 15/29] dm persistent data: Simplify stack trace handling References: <20190418084119.056416939@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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: Replace the indirection through struct stack_trace with an invocation of the storage array based interface. This results in less storage space and indirection. Signed-off-by: Thomas Gleixner Cc: dm-devel@redhat.com Cc: Mike Snitzer Cc: Alasdair Kergon --- drivers/md/persistent-data/dm-block-manager.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) --- a/drivers/md/persistent-data/dm-block-manager.c +++ b/drivers/md/persistent-data/dm-block-manager.c @@ -35,7 +35,10 @@ #define MAX_HOLDERS 4 #define MAX_STACK 10 -typedef unsigned long stack_entries[MAX_STACK]; +struct stack_store { + unsigned int nr_entries; + unsigned long entries[MAX_STACK]; +}; struct block_lock { spinlock_t lock; @@ -44,8 +47,7 @@ struct block_lock { struct task_struct *holders[MAX_HOLDERS]; #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING - struct stack_trace traces[MAX_HOLDERS]; - stack_entries entries[MAX_HOLDERS]; + struct stack_store traces[MAX_HOLDERS]; #endif }; @@ -73,7 +75,7 @@ static void __add_holder(struct block_lo { unsigned h = __find_holder(lock, NULL); #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING - struct stack_trace *t; + struct stack_store *t; #endif get_task_struct(task); @@ -81,11 +83,7 @@ static void __add_holder(struct block_lo #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING t = lock->traces + h; - t->nr_entries = 0; - t->max_entries = MAX_STACK; - t->entries = lock->entries[h]; - t->skip = 2; - save_stack_trace(t); + t->nr_entries = stack_trace_save(t->entries, MAX_STACK, 2); #endif } @@ -106,7 +104,8 @@ static int __check_holder(struct block_l DMERR("recursive lock detected in metadata"); #ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING DMERR("previously held here:"); - print_stack_trace(lock->traces + i, 4); + stack_trace_print(lock->traces[i].entries, + lock->traces[i].nr_entries, 4); DMERR("subsequent acquisition attempted here:"); dump_stack();