For some arch, kexec shall map the reserved pages, then use them, when
we try to start the kdump service.
Now kexec will never unmap the reserved pages, once it fails to continue
starting the kdump service.
Make a pair of reserved pages in kdump starting path, whatever kexec
fails or not.
Signed-off-by: Minfei Huang <mnfhu...@gmail.com>
---
kernel/kexec.c | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 4589899..68f6dfb 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1291,35 +1291,37 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry,
unsigned long, nr_segments,
*/
kimage_free(xchg(&kexec_crash_image, NULL));
- result = kimage_alloc_init(&image, entry, nr_segments,
- segments, flags);
- crash_map_reserved_pages();
- } else {
- /* Loading another kernel to reboot into. */
-
- result = kimage_alloc_init(&image, entry, nr_segments,
- segments, flags);
}
+
+ result = kimage_alloc_init(&image, entry, nr_segments,
+ segments, flags);
if (result)
goto out;
+ if (flags & KEXEC_ON_CRASH)
+ crash_map_reserved_pages();
+
if (flags & KEXEC_PRESERVE_CONTEXT)
image->preserve_context = 1;
result = machine_kexec_prepare(image);
if (result)
- goto out;
+ goto failure;
for (i = 0; i < nr_segments; i++) {
result = kimage_load_segment(image, &image->segment[i]);
if (result)
- goto out;
+ goto failure;
}
kimage_terminate(image);
+
+failure:
if (flags & KEXEC_ON_CRASH)
crash_unmap_reserved_pages();
}
- /* Install the new kernel, and Uninstall the old */
- image = xchg(dest_image, image);
+
+ if (result == 0)
+ /* Install the new kernel, and Uninstall the old */
+ image = xchg(dest_image, image);
out:
mutex_unlock(&kexec_mutex);
--
2.2.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
