From: Xueqin Luo Date: Fri, 11 Nov 2022 05:19:49 +0000 (+0800) Subject: PM: hibernate: Complain about memory map mismatches during resume X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3363e0adb3931e987caa6404327b35ea2db231d8;p=linux.git PM: hibernate: Complain about memory map mismatches during resume The system memory map can change over a hibernation-restore cycle due to a defect in the platform firmware, and some of the page frames used by the kernel before hibernation may not be available any more during the subsequent restore which leads to the error below. [ T357] PM: Image loading progress: 0% [ T357] PM: Read 2681596 kbytes in 0.03 seconds (89386.53 MB/s) [ T357] PM: Error -14 resuming [ T357] PM: Failed to load hibernation image, recovering. [ T357] PM: Basic memory bitmaps freed [ T357] OOM killer enabled. [ T357] Restarting tasks ... done. [ T357] PM: resume from hibernation failed (-14) [ T357] PM: Hibernation image not present or could not be loaded. Add an error message to the unpack() function to allow problematic page frames to be identified and the source of the problem to be diagnosed more easily. This can save developers quite a bit of debugging time. Signed-off-by: Xueqin Luo [ rjw: New subject, edited changelog ] Signed-off-by: Rafael J. Wysocki --- diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index c20ca5fb9adc8..cd8b7b35f1e8b 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -2259,10 +2259,14 @@ static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm) if (unlikely(buf[j] == BM_END_OF_MAP)) break; - if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j])) + if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j])) { memory_bm_set_bit(bm, buf[j]); - else + } else { + if (!pfn_valid(buf[j])) + pr_err(FW_BUG "Memory map mismatch at 0x%llx after hibernation\n", + (unsigned long long)PFN_PHYS(buf[j])); return -EFAULT; + } } return 0;