linux-kernel - [PATCH 025/115] gpu: ion: Switch to using kmalloc rather than kmap during allocation

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Message-Id: <1386973529-4884-26-git-send-email-john.stultz@linaro.org>
Date:	Fri, 13 Dec 2013 14:23:59 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Jesse Barker <jesse.barker@....com>,
	Colin Cross <ccross@...roid.com>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 025/115] gpu: ion: Switch to using kmalloc rather than kmap during allocation

From: Rebecca Schultz Zavin <rebecca@...roid.com>

Previously, metadata was stored in the allocated pages themselves
during allocation.  However the system can only have a limited
number of kmapped pages.  A very large allocation might exceed
this limit.

Signed-off-by: Rebecca Schultz Zavin <rebecca@...roid.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/staging/android/ion/ion_system_heap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index 7397bc4..2fb9a64 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -46,7 +46,7 @@ static struct page_info *alloc_largest_available(unsigned long size)
 		if (!page)
 			continue;
 		split_page(page, orders[i]);
-		info = kmap(page);
+		info = kmalloc(sizeof(struct page_info *), GFP_KERNEL);
 		info->page = page;
 		info->order = orders[i];
 		return info;
@@ -93,7 +93,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
 		}
 		list_del(&info->list);
 		memset(info, 0, sizeof(struct page_info));
-		kunmap(page);
+		kfree(info);
 	}
 
 	dma_sync_sg_for_device(NULL, table->sgl, table->nents,
@@ -107,7 +107,7 @@ err:
 	list_for_each_entry(info, &pages, list) {
 		for (i = 0; i < (1 << info->order); i++)
 			__free_page(info->page + i);
-		kunmap(info->page);
+		kfree(info);
 	}
 	return -ENOMEM;
 }
-- 
1.8.3.2

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