[PATCH 2/6] Revert "mm/cma: remove unsupported gfp_mask parameter from cma_alloc()"

[Gabriel Krisman Bertazi <krisman@collabora.com>]

This reverts commit 6518202970c1052148daaef9a8096711775e43a2.

Commit 6518202970c1 ("mm/cma: remove unsupported gfp_mask parameter from
cma_alloc()") attempts to make more clear that the CMA allocator doesn't
support all of the standard GFP flags by removing that parameter from
cma_alloc().  Unfortunately, this don't make things much more clear
about what CMA supports, as exemplified by the ARM DMA layer issue,
which simply masks away the GFP_NOIO flag when calling the CMA
allocator, letting it assume it is always the hardcoded GFP_KERNEL.

The removal of gfp_flags doesn't make any easier to eventually support
these flags in the CMA allocator, like the rest of this series attempt
to do.  Instead, this patch and the previous one restore that parameter.

CC: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
---
 arch/powerpc/kvm/book3s_hv_builtin.c       | 2 +-
 drivers/s390/char/vmcp.c                   | 2 +-
 drivers/staging/android/ion/ion_cma_heap.c | 2 +-
 include/linux/cma.h                        | 2 +-
 kernel/dma/contiguous.c                    | 3 +--
 mm/cma.c                                   | 8 ++++----
 mm/cma_debug.c                             | 2 +-
 7 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index a71e2fc00a4e..925e8f9fc10d 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -77,7 +77,7 @@ struct page *kvm_alloc_hpt_cma(unsigned long nr_pages)
 	VM_BUG_ON(order_base_2(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
 
 	return cma_alloc(kvm_cma, nr_pages, order_base_2(HPT_ALIGN_PAGES),
-			 false);
+			 GFP_KERNEL);
 }
 EXPORT_SYMBOL_GPL(kvm_alloc_hpt_cma);
 
diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 0fa1b6b1491a..948ce82a7725 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -68,7 +68,7 @@ static void vmcp_response_alloc(struct vmcp_session *session)
 	 * anymore the system won't work anyway.
 	 */
 	if (order > 2)
-		page = cma_alloc(vmcp_cma, nr_pages, 0, false);
+		page = cma_alloc(vmcp_cma, nr_pages, 0, GFP_KERNEL);
 	if (page) {
 		session->response = (char *)page_to_phys(page);
 		session->cma_alloc = 1;
diff --git a/drivers/staging/android/ion/ion_cma_heap.c b/drivers/staging/android/ion/ion_cma_heap.c
index 3fafd013d80a..49718c96bf9e 100644
--- a/drivers/staging/android/ion/ion_cma_heap.c
+++ b/drivers/staging/android/ion/ion_cma_heap.c
@@ -39,7 +39,7 @@ static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
 	if (align > CONFIG_CMA_ALIGNMENT)
 		align = CONFIG_CMA_ALIGNMENT;
 
-	pages = cma_alloc(cma_heap->cma, nr_pages, align, false);
+	pages = cma_alloc(cma_heap->cma, nr_pages, align, GFP_KERNEL);
 	if (!pages)
 		return -ENOMEM;
 
diff --git a/include/linux/cma.h b/include/linux/cma.h
index 190184b5ff32..bf90f0bb42bd 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -33,7 +33,7 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 					const char *name,
 					struct cma **res_cma);
 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
-			      bool no_warn);
+			      gfp_t gfp_mask);
 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
 
 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index b1c3109bbd26..54a33337680f 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -195,8 +195,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
 	if (align > CONFIG_CMA_ALIGNMENT)
 		align = CONFIG_CMA_ALIGNMENT;
 
-	return cma_alloc(dev_get_cma_area(dev), count, align,
-			 gfp_mask & __GFP_NOWARN);
+	return cma_alloc(dev_get_cma_area(dev), count, align, gfp_mask);
 }
 
 /**
diff --git a/mm/cma.c b/mm/cma.c
index c7b39dd3b4f6..fdad7ad0d9c4 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -395,13 +395,13 @@ static inline void cma_debug_show_areas(struct cma *cma) { }
  * @cma:   Contiguous memory region for which the allocation is performed.
  * @count: Requested number of pages.
  * @align: Requested alignment of pages (in PAGE_SIZE order).
- * @no_warn: Avoid printing message about failed allocation
+ * @gfp_mask:  GFP mask to use during compaction
  *
  * This function allocates part of contiguous memory on specific
  * contiguous memory area.
  */
 struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
-		       bool no_warn)
+		       gfp_t gfp_mask)
 {
 	unsigned long mask, offset;
 	unsigned long pfn = -1;
@@ -448,7 +448,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
 		pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
 		mutex_lock(&cma_mutex);
 		ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
-				     GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0));
+					 gfp_mask);
 		mutex_unlock(&cma_mutex);
 		if (ret == 0) {
 			page = pfn_to_page(pfn);
@@ -477,7 +477,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
 			page_kasan_tag_reset(page + i);
 	}
 
-	if (ret && !no_warn) {
+	if (ret && !(gfp_mask & __GFP_NOWARN)) {
 		pr_err("%s: alloc failed, req-size: %zu pages, ret: %d\n",
 			__func__, count, ret);
 		cma_debug_show_areas(cma);
diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index ad6723e9d110..f23467291cfb 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -139,7 +139,7 @@ static int cma_alloc_mem(struct cma *cma, int count)
 	if (!mem)
 		return -ENOMEM;
 
-	p = cma_alloc(cma, count, 0, false);
+	p = cma_alloc(cma, count, 0, GFP_KERNEL);
 	if (!p) {
 		kfree(mem);
 		return -ENOMEM;
-- 
2.20.1