From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Mon, 4 Jan 2021 19:28:48 +0000 (-0500)
Subject: arch/powerpc: Optimize cell spu task sync.
X-Git-Tag: howlett/maple_spf/20210104~38
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5147d8eff59c43d06c8ab805527fc31349f3442a;p=users%2Fjedix%2Flinux-maple.git

arch/powerpc: Optimize cell spu task sync.

Use the vma api to look up the spu reference instead of walking the linked list.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/arch/powerpc/oprofile/cell/spu_task_sync.c b/arch/powerpc/oprofile/cell/spu_task_sync.c
index 489f993100d5..47b4d4e9b628 100644
--- a/arch/powerpc/oprofile/cell/spu_task_sync.c
+++ b/arch/powerpc/oprofile/cell/spu_task_sync.c
@@ -333,19 +333,17 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
 	}
 
 	mmap_read_lock(mm);
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
-		if (vma->vm_start > spu_ref || vma->vm_end <= spu_ref)
-			continue;
-		my_offset = spu_ref - vma->vm_start;
-		if (!vma->vm_file)
-			goto fail_no_image_cookie;
-
-		pr_debug("Found spu ELF at %X(object-id:%lx) for file %pD\n",
-			 my_offset, spu_ref, vma->vm_file);
-		*offsetp = my_offset;
-		break;
-	}
+	vma = find_vma_intersection(mm, spu_ref, spu_ref + 1);
+	if (!vma)
+		goto fail_no_image_cookie;
+
+	my_offset = spu_ref - vma->vm_start;
+	if (!vma->vm_file)
+		goto fail_no_image_cookie;
 
+	pr_debug("Found spu ELF at %X(object-id:%lx) for file %pD\n",
+		 my_offset, spu_ref, vma->vm_file);
+	*offsetp = my_offset;
 	*spu_bin_dcookie = fast_get_dcookie(&vma->vm_file->f_path);
 	pr_debug("got dcookie for %pD\n", vma->vm_file);