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Re: [PATCH] xen/grant-table: scope gnttab suspend and resume helpers to hibernate callbacks
- To: Pengpeng Hou <pengpeng.hou@xxxxxxxxxxxxxxxx>, sstabellini@xxxxxxxxxx, oleksandr_tyshchenko@xxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Mon, 9 Mar 2026 09:46:38 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, 18291782795@xxxxxxx
- Delivery-date: Mon, 09 Mar 2026 08:46:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.03.26 09:36, Pengpeng Hou wrote:
From: pengpeng.hou@xxxxxxxxxxxxxxxx
In current linux.git (1954c4f01220), gnttab_suspend() and
gnttab_resume() are defined and declared unconditionally. However,
their only in-tree callers reside in drivers/xen/manage.c, which are
guarded by #ifdef CONFIG_HIBERNATE_CALLBACKS.
Match the helper scope to their callers by wrapping the definitions in
CONFIG_HIBERNATE_CALLBACKS and providing no-op stubs in the header. This
fixes the config-scope mismatch and reduces the code footprint when
hibernation callbacks are disabled.
Signed-off-by: pengpeng.hou@xxxxxxxxxxxxxxxx
---
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@
-int gnttab_resume(void)
+#ifdef CONFIG_HIBERNATE_CALLBACKS
+int gnttab_resume(void)
{
gnttab_request_version();
return gnttab_setup();
@@
if (xen_pv_domain())
gnttab_interface->unmap_frames();
return 0;
}
+#endif
static int gnttab_expand(unsigned int req_entries)
{
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@
int gnttab_init(void);
+#ifdef CONFIG_HIBERNATE_CALLBACKS
int gnttab_suspend(void);
int gnttab_resume(void);
+#else
+static inline int gnttab_suspend(void)
+{
+ return 0;
+}
+
+static inline int gnttab_resume(void)
+{
+ return 0;
+}
+#endif
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
int readonly);
I do agree on the purpose of the patch, but the patch itself is a little
bit strange. The hunks lack any information about line numbers and hunk
size, and the context is not consistent (0 - 4 lines of unmodified code
around the modified parts).
Please produce the patch with a proper tool, like "git format-patch".
Juergen
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