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From:   Tian Tao <tiantao6@hisilicon.com>
To:     <akpm@linux-foundation.org>, <linux-mm@kvack.org>,
        <linux-kernel@vger.kernel.org>
CC:     <linuxarm@huawei.com>
Subject: [PATCH v3] vmalloc: Add the right hint when vmalloc failed
Date:   Fri, 10 Jul 2020 20:17:52 +0800
Message-ID: <1594383472-52983-1-git-send-email-tiantao6@hisilicon.com>
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Sender: linux-kernel-owner@vger.kernel.org
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In fact "vmalloc=<size>" cmdline option is not available on many
platforms.When the user encounters this error, add the correct
hint to prevent misleading.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>

v2:
Add appropriate hints and let users decide if they can increase
the size of the vmalloc by vmalloc=<size> depending on their platform

v3:
change the patch name and commit messages.
---
 mm/vmalloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 89e83d3..c6ae7e6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1238,8 +1238,8 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
 	}
 
 	if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit())
-		pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size\n",
-			size);
+		pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size,
+			if your ARCH supports it\n", size);
 
 	kmem_cache_free(vmap_area_cachep, va);
 	return ERR_PTR(-EBUSY);
-- 
2.7.4