[PATCH v3 21/75] x86/boot/compressed/64: Check return value of kernel_ident_mapping_init()

Joerg Roedel
2020-04-28T15:16:31Z

From: Joerg Roedel <jroedel@suse.de>

The function can fail to create an identity mapping, check for that
and bail out if it happens.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/boot/compressed/ident_map_64.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c
index 6ee089fdc65a..5d8b0bffe421 100644
--- a/arch/x86/boot/compressed/ident_map_64.c
+++ b/arch/x86/boot/compressed/ident_map_64.c
@@ -93,6 +93,8 @@ static struct x86_mapping_info mapping_info;
*/
static void add_identity_map(unsigned long start, unsigned long end)
{
+ int ret;
+
/* Align boundary to 2M. */
start = round_down(start, PMD_SIZE);
end = round_up(end, PMD_SIZE);
@@ -100,8 +102,9 @@ static void add_identity_map(unsigned long start, unsigned long end)
return;

/* Build the mapping. */
- kernel_ident_mapping_init(&mapping_info, (pgd_t *)top_level_pgt,
- start, end);
+ ret = kernel_ident_mapping_init(&mapping_info, (pgd_t *)top_level_pgt, start, end);
+ if (ret)
+ error("Error: kernel_ident_mapping_init() failed\n");
}

/* Locates and clears a region for a new top level page table. */
--
2.17.1