linux-kernel - [tip:core/stacktrace] dma/debug: Simplify stracktrace retrieval

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Message-ID: <tip-746017ed8d4d3c2070bb03aee9536f24da43c778@git.kernel.org>
Date:   Mon, 29 Apr 2019 11:39:02 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     maarten.lankhorst@...ux.intel.com, robin.murphy@....com,
        mingo@...nel.org, snitzer@...hat.com, catalin.marinas@....com,
        luto@...nel.org, linux-kernel@...r.kernel.org,
        tom.zanussi@...ux.intel.com, jani.nikula@...ux.intel.com,
        akinobu.mita@...il.com, cl@...ux.com, penberg@...nel.org,
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        mbenes@...e.cz, dvyukov@...gle.com
Subject: [tip:core/stacktrace] dma/debug: Simplify stracktrace retrieval

Commit-ID:  746017ed8d4d3c2070bb03aee9536f24da43c778
Gitweb:     https://git.kernel.org/tip/746017ed8d4d3c2070bb03aee9536f24da43c778
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 25 Apr 2019 11:45:05 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 29 Apr 2019 12:37:50 +0200

dma/debug: Simplify stracktrace retrieval

Replace the indirection through struct stack_trace with an invocation of
the storage array based interface.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: iommu@...ts.linux-foundation.org
Cc: Robin Murphy <robin.murphy@....com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: linux-mm@...ck.org
Cc: David Rientjes <rientjes@...gle.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: kasan-dev@...glegroups.com
Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc: Akinobu Mita <akinobu.mita@...il.com>
Cc: Johannes Thumshirn <jthumshirn@...e.de>
Cc: David Sterba <dsterba@...e.com>
Cc: Chris Mason <clm@...com>
Cc: Josef Bacik <josef@...icpanda.com>
Cc: linux-btrfs@...r.kernel.org
Cc: dm-devel@...hat.com
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: Alasdair Kergon <agk@...hat.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: intel-gfx@...ts.freedesktop.org
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: David Airlie <airlied@...ux.ie>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc: Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc: Miroslav Benes <mbenes@...e.cz>
Cc: linux-arch@...r.kernel.org
Link: https://lkml.kernel.org/r/20190425094802.248658135@linutronix.de

---
 kernel/dma/debug.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index a218e43cc382..badd77670d00 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -89,8 +89,8 @@ struct dma_debug_entry {
 	int		 sg_mapped_ents;
 	enum map_err_types  map_err_type;
 #ifdef CONFIG_STACKTRACE
-	struct		 stack_trace stacktrace;
-	unsigned long	 st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
+	unsigned int	stack_len;
+	unsigned long	stack_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
 #endif
 };
 
@@ -174,7 +174,7 @@ static inline void dump_entry_trace(struct dma_debug_entry *entry)
 #ifdef CONFIG_STACKTRACE
 	if (entry) {
 		pr_warning("Mapped at:\n");
-		print_stack_trace(&entry->stacktrace, 0);
+		stack_trace_print(entry->stack_entries, entry->stack_len, 0);
 	}
 #endif
 }
@@ -704,12 +704,10 @@ static struct dma_debug_entry *dma_entry_alloc(void)
 	spin_unlock_irqrestore(&free_entries_lock, flags);
 
 #ifdef CONFIG_STACKTRACE
-	entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
-	entry->stacktrace.entries = entry->st_entries;
-	entry->stacktrace.skip = 1;
-	save_stack_trace(&entry->stacktrace);
+	entry->stack_len = stack_trace_save(entry->stack_entries,
+					    ARRAY_SIZE(entry->stack_entries),
+					    1);
 #endif
-
 	return entry;
 }