linux-hardening - [RFC PATCH v2 09/19] x86/mm: Support GFP_ATOMIC in alloc_table

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Message-Id: <20210830235927.6443-10-rick.p.edgecombe@intel.com>
Date:   Mon, 30 Aug 2021 16:59:17 -0700
From:   Rick Edgecombe <rick.p.edgecombe@...el.com>
To:     dave.hansen@...el.com, luto@...nel.org, peterz@...radead.org,
        x86@...nel.org, akpm@...ux-foundation.org, keescook@...omium.org,
        shakeelb@...gle.com, vbabka@...e.cz, rppt@...nel.org
Cc:     Rick Edgecombe <rick.p.edgecombe@...el.com>, linux-mm@...ck.org,
        linux-hardening@...r.kernel.org,
        kernel-hardening@...ts.openwall.com, ira.weiny@...el.com,
        dan.j.williams@...el.com, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 09/19] x86/mm: Support GFP_ATOMIC in alloc_table_node()

For GFP_ATOMIC in alloc_table/_node(), use get_grouped_page_atomic().

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
 arch/x86/mm/pgtable.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index ef0b4ce95522..e65d69ad6e0c 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -52,7 +52,10 @@ struct page *alloc_table(gfp_t gfp)
 		return table;
 	}
 
-	table = get_grouped_page(numa_node_id(), &gpc_pks);
+	if (gfp & GFP_ATOMIC)
+		table = get_grouped_page_atomic(numa_node_id(), &gpc_pks);
+	else
+		table = get_grouped_page(numa_node_id(), &gpc_pks);
 	if (!table)
 		return NULL;
 	__SetPageTable(table);
-- 
2.17.1