[PATCH v3 1/4] mm: cma: introduce gfp flag in cma_alloc instead of no_warn

Minchan Kim
2021-01-13T01:21:59Z

The upcoming patch will introduce __GFP_NORETRY semantic
in alloc_contig_range which is a failfast mode of the API.
Instead of adding a additional parameter for gfp, replace
no_warn with gfp flag.

To keep old behaviors, it follows the rule below.

no_warn gfp_flags

false GFP_KERNEL
true GFP_KERNEL|__GFP_NOWARN
gfp & __GFP_NOWARN GFP_KERNEL | (gfp & __GFP_NOWARN)

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
drivers/dma-buf/heaps/cma_heap.c | 2 +-
drivers/s390/char/vmcp.c | 2 +-
include/linux/cma.h | 2 +-
kernel/dma/contiguous.c | 3 ++-
mm/cma.c | 12 ++++++------
mm/cma_debug.c | 2 +-
mm/hugetlb.c | 6 ++++--
mm/secretmem.c | 3 ++-
8 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
index 364fc2f3e499..0afc1907887a 100644
--- a/drivers/dma-buf/heaps/cma_heap.c
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -298,7 +298,7 @@ static int cma_heap_allocate(struct dma_heap *heap,
if (align > CONFIG_CMA_ALIGNMENT)
align = CONFIG_CMA_ALIGNMENT;

- cma_pages = cma_alloc(cma_heap->cma, pagecount, align, false);
+ cma_pages = cma_alloc(cma_heap->cma, pagecount, align, GFP_KERNEL);
if (!cma_pages)
goto free_buffer;

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 9e066281e2d0..78f9adf56456 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -70,7 +70,7 @@ 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/include/linux/cma.h b/include/linux/cma.h
index 217999c8a762..d6c02d08ddbc 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -45,7 +45,7 @@ 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 3d63d91cba5c..552ed531c018 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -260,7 +260,8 @@ 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, no_warn);
+ return cma_alloc(dev_get_cma_area(dev), count, align, GFP_KERNEL |
+ (no_warn ? __GFP_NOWARN : 0));
}

/**
diff --git a/mm/cma.c b/mm/cma.c
index 0ba69cd16aeb..35053b82aedc 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -419,13 +419,13 @@ 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 during the cma allocation.
*
* 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;
@@ -438,8 +438,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
if (!cma || !cma->count || !cma->bitmap)
return NULL;

- pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
- count, align);
+ pr_debug("%s(cma %p, count %zu, align %d gfp_mask 0x%x)\n", __func__,
+ (void *)cma, count, align, gfp_mask);

if (!count)
return NULL;
@@ -471,7 +471,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,

pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
- GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0));
+ gfp_mask);

if (ret == 0) {
page = pfn_to_page(pfn);
@@ -500,7 +500,7 @@ 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 d5bf8aa34fdc..00170c41cf81 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -137,7 +137,7 @@ 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;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 737b2dce19e6..695af33aa66c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1266,7 +1266,8 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,

if (hugetlb_cma[nid]) {
page = cma_alloc(hugetlb_cma[nid], nr_pages,
- huge_page_order(h), true);
+ huge_page_order(h),
+ GFP_KERNEL | __GFP_NOWARN);
if (page)
return page;
}
@@ -1277,7 +1278,8 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
continue;

page = cma_alloc(hugetlb_cma[node], nr_pages,
- huge_page_order(h), true);
+ huge_page_order(h),
+ GFP_KERNEL | __GFP_NOWARN);
if (page)
return page;
}
diff --git a/mm/secretmem.c b/mm/secretmem.c
index b8a32954ac68..585d55b9f9d8 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -86,7 +86,8 @@ static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
struct page *page;
int err;

- page = cma_alloc(secretmem_cma, nr_pages, PMD_SIZE, gfp & __GFP_NOWARN);
+ page = cma_alloc(secretmem_cma, nr_pages, PMD_SIZE,
+ GFP_KERNEL | (gfp & __GFP_NOWARN));
if (!page)
return -ENOMEM;

--
2.30.0.284.gd98b1dd5eaa7-goog