From 162573937679ff36c9acd54268c047199dab564e Mon Sep 17 00:00:00 2001 From: Mahesh Salgaonkar Date: Thu, 16 Feb 2012 01:15:00 +0000 Subject: [PATCH] fadump: Introduce cleanup routine to invalidate /proc/vmcore. With the firmware-assisted dump support we don't require a reboot when we are in second kernel after crash. The second kernel after crash is a normal kernel boot and has knowledge about entire system RAM with the page tables initialized for entire system RAM. Hence once the dump is saved to disk, we can just release the reserved memory area for general use and continue with second kernel as production kernel. Hence when we release the reserved memory that contains dump data, the '/proc/vmcore' will not be valid anymore. Hence this patch introduces a cleanup routine that invalidates and removes the /proc/vmcore file. This routine will be invoked before we release the reserved dump memory area. Signed-off-by: Mahesh Salgaonkar Signed-off-by: Benjamin Herrenschmidt --- fs/proc/vmcore.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index b0f450a2bb7c..0d5071d29985 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -700,3 +700,26 @@ static int __init vmcore_init(void) return 0; } module_init(vmcore_init) + +/* Cleanup function for vmcore module. */ +void vmcore_cleanup(void) +{ + struct list_head *pos, *next; + + if (proc_vmcore) { + remove_proc_entry(proc_vmcore->name, proc_vmcore->parent); + proc_vmcore = NULL; + } + + /* clear the vmcore list. */ + list_for_each_safe(pos, next, &vmcore_list) { + struct vmcore *m; + + m = list_entry(pos, struct vmcore, list); + list_del(&m->list); + kfree(m); + } + kfree(elfcorebuf); + elfcorebuf = NULL; +} +EXPORT_SYMBOL_GPL(vmcore_cleanup); -- 2.30.2