netdev - [PATCH bpf-next] mm: implement no-MMU variant of vmalloc_user_node

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Message-ID: <20191123220835.1237773-1-andriin@fb.com>
Date:   Sat, 23 Nov 2019 14:08:35 -0800
From:   Andrii Nakryiko <andriin@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH bpf-next] mm: implement no-MMU variant of vmalloc_user_node_flags

To fix build with !CONFIG_MMU, implement it for no-MMU configurations as well.

Cc: Johannes Weiner <hannes@...xchg.org>
Fixes: fc9702273e2e ("bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY")
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Andrii Nakryiko <andriin@...com>
---
 mm/nommu.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 99b7ec318824..7de592058ab4 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -155,11 +155,11 @@ void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags)
 	return __vmalloc(size, flags, PAGE_KERNEL);
 }
 
-void *vmalloc_user(unsigned long size)
+static void *__vmalloc_user_flags(unsigned long size, gfp_t flags)
 {
 	void *ret;
 
-	ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
+	ret = __vmalloc(size, flags, PAGE_KERNEL);
 	if (ret) {
 		struct vm_area_struct *vma;
 
@@ -172,8 +172,19 @@ void *vmalloc_user(unsigned long size)
 
 	return ret;
 }
+
+void *vmalloc_user(unsigned long size)
+{
+	return __vmalloc_user_flags(size, GFP_KERNEL | __GFP_ZERO);
+}
 EXPORT_SYMBOL(vmalloc_user);
 
+void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags)
+{
+	return __vmalloc_user_flags(size, flags | __GFP_ZERO);
+}
+EXPORT_SYMBOL(vmalloc_user_node_flags);
+
 struct page *vmalloc_to_page(const void *addr)
 {
 	return virt_to_page(addr);
-- 
2.17.1