[PATCH] x86/kexec: Simplify the logic of mem_region_callback()

[Yuntao Wang]

The expression `mstart + resource_size(res) - 1` is actually equivalent to
`res->end`, simplify the logic of this function to improve readability.

Signed-off-by: Yuntao Wang <ytcoode@xxxxxxxxx>
---
 arch/x86/kernel/machine_kexec_64.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 1a3e2c05a8a5..6f8df998890e 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -42,12 +42,9 @@ struct init_pgtable_data {
 static int mem_region_callback(struct resource *res, void *arg)
 {
 	struct init_pgtable_data *data = arg;
-	unsigned long mstart, mend;
-
-	mstart = res->start;
-	mend = mstart + resource_size(res) - 1;
 
-	return kernel_ident_mapping_init(data->info, data->level4p, mstart, mend);
+	return kernel_ident_mapping_init(data->info, data->level4p,
+					 res->start, res->end);
 }
 
 static int
-- 
2.43.0