linux-kernel - [PATCH v3 4/4] perf/core: use vma_is_initial_stack() and vma_is_initial

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Message-ID: <20230728050043.59880-5-wangkefeng.wang@huawei.com>
Date:   Fri, 28 Jul 2023 13:00:43 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-perf-users@...r.kernel.org>,
        <selinux@...r.kernel.org>,
        Christian Göttsche <cgzones@...glemail.com>,
        David Hildenbrand <david@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        <christian.koenig@....com>, <Xinhui.Pan@....com>,
        <airlied@...il.com>, <daniel@...ll.ch>, <paul@...l-moore.com>,
        <stephen.smalley.work@...il.com>, <eparis@...isplace.org>,
        <peterz@...radead.org>, <acme@...nel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v3 4/4] perf/core: use vma_is_initial_stack() and vma_is_initial_heap()

Use the helpers to simplify code, also kill unneeded goto cpy_name.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Reviewed-by: David Hildenbrand <david@...hat.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 kernel/events/core.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index f84e2640ea2f..b36d0823ff33 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8631,7 +8631,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
 	unsigned int size;
 	char tmp[16];
 	char *buf = NULL;
-	char *name;
+	char *name = NULL;
 
 	if (vma->vm_flags & VM_READ)
 		prot |= PROT_READ;
@@ -8678,29 +8678,18 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
 
 		goto got_name;
 	} else {
-		if (vma->vm_ops && vma->vm_ops->name) {
+		if (vma->vm_ops && vma->vm_ops->name)
 			name = (char *) vma->vm_ops->name(vma);
-			if (name)
-				goto cpy_name;
+		if (!name)
+			name = (char *)arch_vma_name(vma);
+		if (!name) {
+			if (vma_is_initial_heap(vma))
+				name = "[heap]";
+			else if (vma_is_initial_stack(vma))
+				name = "[stack]";
+			else
+				name = "//anon";
 		}
-
-		name = (char *)arch_vma_name(vma);
-		if (name)
-			goto cpy_name;
-
-		if (vma->vm_start <= vma->vm_mm->start_brk &&
-				vma->vm_end >= vma->vm_mm->brk) {
-			name = "[heap]";
-			goto cpy_name;
-		}
-		if (vma->vm_start <= vma->vm_mm->start_stack &&
-				vma->vm_end >= vma->vm_mm->start_stack) {
-			name = "[stack]";
-			goto cpy_name;
-		}
-
-		name = "//anon";
-		goto cpy_name;
 	}
 
 cpy_name:
-- 
2.41.0