linux-kernel - [PATCH AUTOSEL 4.4 35/48] proc/vmcore: Fix i386 build error of missing copy_oldmem_page

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Message-Id: <20191113020131.13356-35-sashal@kernel.org>
Date:   Tue, 12 Nov 2019 21:01:18 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Borislav Petkov <bp@...e.de>, Lianbo Jiang <lijiang@...hat.com>,
        x86@...nel.org, Sasha Levin <sashal@...nel.org>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 35/48] proc/vmcore: Fix i386 build error of missing copy_oldmem_page_encrypted()

From: Borislav Petkov <bp@...e.de>

[ Upstream commit cf089611f4c446285046fcd426d90c18f37d2905 ]

Lianbo reported a build error with a particular 32-bit config, see Link
below for details.

Provide a weak copy_oldmem_page_encrypted() function which architectures
can override, in the same manner other functionality in that file is
supplied.

Reported-by: Lianbo Jiang <lijiang@...hat.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
CC: x86@...nel.org
Link: http://lkml.kernel.org/r/710b9d95-2f70-eadf-c4a1-c3dc80ee4ebb@redhat.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/proc/vmcore.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 4e61388ec03d2..08143139b65a7 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -164,6 +164,16 @@ int __weak remap_oldmem_pfn_range(struct vm_area_struct *vma,
 	return remap_pfn_range(vma, from, pfn, size, prot);
 }
 
+/*
+ * Architectures which support memory encryption override this.
+ */
+ssize_t __weak
+copy_oldmem_page_encrypted(unsigned long pfn, char *buf, size_t csize,
+			   unsigned long offset, int userbuf)
+{
+	return copy_oldmem_page(pfn, buf, csize, offset, userbuf);
+}
+
 /*
  * Copy to either kernel or user space
  */
-- 
2.20.1