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Date:   Mon, 29 Apr 2019 11:47:47 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, akinobu.mita@...il.com,
        joonas.lahtinen@...ux.intel.com, robin.murphy@....com,
        mbenes@...e.cz, jpoimboe@...hat.com, snitzer@...hat.com,
        clm@...com, luto@...nel.org, penberg@...nel.org,
        maarten.lankhorst@...ux.intel.com, jthumshirn@...e.de,
        glider@...gle.com, dvyukov@...gle.com, tom.zanussi@...ux.intel.com,
        hpa@...or.com, rodrigo.vivi@...el.com, rostedt@...dmis.org,
        rientjes@...gle.com, dsterba@...e.com, mingo@...nel.org,
        catalin.marinas@....com, hch@....de, agk@...hat.com,
        m.szyprowski@...sung.com, airlied@...ux.ie,
        aryabinin@...tuozzo.com, akpm@...ux-foundation.org, cl@...ux.com,
        linux-kernel@...r.kernel.org, daniel@...ll.ch, adobriyan@...il.com,
        rppt@...ux.vnet.ibm.com, josef@...icpanda.com,
        jani.nikula@...ux.intel.com
Subject: [tip:core/stacktrace] livepatch: Simplify stack trace retrieval

Commit-ID:  25e39e32b0a3f99b9db320605f20f91d425b6a65
Gitweb:     https://git.kernel.org/tip/25e39e32b0a3f99b9db320605f20f91d425b6a65
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 25 Apr 2019 11:45:18 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 29 Apr 2019 12:37:56 +0200

livepatch: Simplify stack trace retrieval

Replace the indirection through struct stack_trace by using the storage
array based interfaces.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@...hat.com>
Acked-by: Miroslav Benes <mbenes@...e.cz>
Cc: Andy Lutomirski <luto@...nel.org>
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: Christoph Hellwig <hch@....de>
Cc: iommu@...ts.linux-foundation.org
Cc: Robin Murphy <robin.murphy@....com>
Cc: Marek Szyprowski <m.szyprowski@...sung.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: linux-arch@...r.kernel.org
Link: https://lkml.kernel.org/r/20190425094803.437950229@linutronix.de

---
 kernel/livepatch/transition.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 9c89ae8b337a..c53370d596be 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -202,15 +202,15 @@ void klp_update_patch_state(struct task_struct *task)
  * Determine whether the given stack trace includes any references to a
  * to-be-patched or to-be-unpatched function.
  */
-static int klp_check_stack_func(struct klp_func *func,
-				struct stack_trace *trace)
+static int klp_check_stack_func(struct klp_func *func, unsigned long *entries,
+				unsigned int nr_entries)
 {
 	unsigned long func_addr, func_size, address;
 	struct klp_ops *ops;
 	int i;
 
-	for (i = 0; i < trace->nr_entries; i++) {
-		address = trace->entries[i];
+	for (i = 0; i < nr_entries; i++) {
+		address = entries[i];
 
 		if (klp_target_state == KLP_UNPATCHED) {
 			 /*
@@ -254,29 +254,25 @@ static int klp_check_stack_func(struct klp_func *func,
 static int klp_check_stack(struct task_struct *task, char *err_buf)
 {
 	static unsigned long entries[MAX_STACK_ENTRIES];
-	struct stack_trace trace;
 	struct klp_object *obj;
 	struct klp_func *func;
-	int ret;
+	int ret, nr_entries;
 
-	trace.skip = 0;
-	trace.nr_entries = 0;
-	trace.max_entries = MAX_STACK_ENTRIES;
-	trace.entries = entries;
-	ret = save_stack_trace_tsk_reliable(task, &trace);
+	ret = stack_trace_save_tsk_reliable(task, entries, ARRAY_SIZE(entries));
 	WARN_ON_ONCE(ret == -ENOSYS);
-	if (ret) {
+	if (ret < 0) {
 		snprintf(err_buf, STACK_ERR_BUF_SIZE,
 			 "%s: %s:%d has an unreliable stack\n",
 			 __func__, task->comm, task->pid);
 		return ret;
 	}
+	nr_entries = ret;
 
 	klp_for_each_object(klp_transition_patch, obj) {
 		if (!obj->patched)
 			continue;
 		klp_for_each_func(obj, func) {
-			ret = klp_check_stack_func(func, &trace);
+			ret = klp_check_stack_func(func, entries, nr_entries);
 			if (ret) {
 				snprintf(err_buf, STACK_ERR_BUF_SIZE,
 					 "%s: %s:%d is sleeping on function %s\n",

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