linux-kernel - [PATCH mm] mm/vmalloc: repair warn_alloc()s in __vmalloc_area

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Date:   Wed, 15 Sep 2021 14:43:10 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel@...nvz.org
Subject: [PATCH mm] mm/vmalloc: repair warn_alloc()s in __vmalloc_area_node()

Commit f255935b9767 ("mm: cleanup the gfp_mask handling in
__vmalloc_area_node") added __GFP_NOWARN to gfp_mask unconditionally
however it disabled all output inside warn_alloc() call.
This patch saves original gfp_mask and provides it to all warn_alloc() calls.

Fixes: f255935b9767 ("mm: cleanup the gfp_mask handling in __vmalloc_area_node")
Cc: Christoph Hellwig <hch@....de>

Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 mm/vmalloc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 551011399974..ff8538b1b28f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2888,6 +2888,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 				 int node)
 {
 	const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
+	const gfp_t orig_gfp_mask = gfp_mask;
 	unsigned long addr = (unsigned long)area->addr;
 	unsigned long size = get_vm_area_size(area);
 	unsigned long array_size;
@@ -2908,7 +2909,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	}
 
 	if (!area->pages) {
-		warn_alloc(gfp_mask, NULL,
+		warn_alloc(orig_gfp_mask, NULL,
 			"vmalloc error: size %lu, failed to allocated page array size %lu",
 			nr_small_pages * PAGE_SIZE, array_size);
 		free_vm_area(area);
@@ -2928,7 +2929,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	 * allocation request, free them via __vfree() if any.
 	 */
 	if (area->nr_pages != nr_small_pages) {
-		warn_alloc(gfp_mask, NULL,
+		warn_alloc(orig_gfp_mask, NULL,
 			"vmalloc error: size %lu, page order %u, failed to allocate pages",
 			area->nr_pages * PAGE_SIZE, page_order);
 		goto fail;
@@ -2936,7 +2937,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 
 	if (vmap_pages_range(addr, addr + size, prot, area->pages,
 			page_shift) < 0) {
-		warn_alloc(gfp_mask, NULL,
+		warn_alloc(orig_gfp_mask, NULL,
 			"vmalloc error: size %lu, failed to map pages",
 			area->nr_pages * PAGE_SIZE);
 		goto fail;
-- 
2.31.1