From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 6 Dec 2005 03:52:22 +0000 (-0500)
Subject: [PATCH] spufs: fix local store page refcounting
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d88cfffac0002c56c1a7a813cb885fa6b5fdcd0e;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] spufs: fix local store page refcounting

With the new rules for reserved pages, the spufs now
needs working page reference counting.

I should probably look into converting to vm_insert_page,
but for now this patch makes spufs work again.

Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index 56273e56cbfb..c41a6e2e2c30 100644
--- a/arch/powerpc/platforms/cell/setup.c
+++ b/arch/powerpc/platforms/cell/setup.c
@@ -114,7 +114,7 @@ static void __init cell_spuprop_present(struct device_node *spe,
 		for (pfn = start_pfn; pfn < end_pfn; pfn++) {
 			struct page *page = pfn_to_page(pfn);
 			set_page_links(page, ZONE_DMA, node_id, pfn);
-			set_page_count(page, 0);
+			set_page_count(page, 1);
 			reset_page_mapcount(page);
 			SetPageReserved(page);
 			INIT_LIST_HEAD(&page->lru);
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 786fdb1a1cc1..0fe1feccc02d 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -23,6 +23,7 @@
 #include <linux/fs.h>
 #include <linux/ioctl.h>
 #include <linux/module.h>
+#include <linux/pagemap.h>
 #include <linux/poll.h>
 
 #include <asm/io.h>
@@ -106,6 +107,7 @@ spufs_mem_mmap_nopage(struct vm_area_struct *vma,
 	if (type)
 		*type = VM_FAULT_MINOR;
 
+	page_cache_get(page);
 	return page;
 }
 
@@ -120,7 +122,6 @@ spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
 		return -EINVAL;
 
 	/* FIXME: */
-	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
 				     | _PAGE_NO_CACHE);