Hello,
Commit a6335fa11 (MIPS: bootmem: Don't use memory holes for page bitmap)
crashes kernel with a initramfs unpacking error when initrd is enabled.
---- error message ----
Unpacking initramfs...
Initramfs unpacking failed: junk in compressed archive
BUG: Bad page state in process swapper pfn:00261
page:81004c20 count:0 mapcount:-127 mapping: (null) index:0x2
flags: 0x0()
page dumped because: nonzero mapcount
CPU: 0 PID: 1 Comm: swapper Not tainted 4.2.0+ #1782
-----------------------
The modified logic in bootmem_init does not guarantee mapstart to be placed
after initrd_end. mapstart is set to the maximum of reserved_end and
start. In case initrd_end is greater than reserved_end, mapstart is placed
before initrd_end, and causes initramfs unpacking error.
----- bootmem_init ---
if (end <= reserved_end)
continue;
+#ifdef CONFIG_BLK_DEV_INITRD
+ /* mapstart should be after initrd_end */
+ if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
+ continue;
+#endif
if (start >= mapstart)
continue;
mapstart = max(reserved_end, start);
-----------------------
Thanks,
Tony
