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authorJim Keniston <jkenisto@linux.vnet.ibm.com>2011-02-09 12:43:13 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-03-04 18:19:04 +1100
commit0f4ac132365e56802cbe377313491aa84086371c (patch)
tree447b5da68f7c3160bbe9c9262f0ed337a2008d57 /arch/powerpc/kernel/nvram_64.c
parent6dd227002972be910c6191f38f8641e01796557f (diff)
powerpc/nvram: Generalize code for OS partitions in NVRAM
Adapt the functions used to create and write to the RTAS-log partition to work with any OS-type partition. Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/nvram_64.c')
-rw-r--r--arch/powerpc/kernel/nvram_64.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index bb12b3248f13..bec1e930ed73 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -237,22 +237,45 @@ static unsigned char __init nvram_checksum(struct nvram_header *p)
return c_sum;
}
+/*
+ * Per the criteria passed via nvram_remove_partition(), should this
+ * partition be removed? 1=remove, 0=keep
+ */
+static int nvram_can_remove_partition(struct nvram_partition *part,
+ const char *name, int sig, const char *exceptions[])
+{
+ if (part->header.signature != sig)
+ return 0;
+ if (name) {
+ if (strncmp(name, part->header.name, 12))
+ return 0;
+ } else if (exceptions) {
+ const char **except;
+ for (except = exceptions; *except; except++) {
+ if (!strncmp(*except, part->header.name, 12))
+ return 0;
+ }
+ }
+ return 1;
+}
+
/**
* nvram_remove_partition - Remove one or more partitions in nvram
* @name: name of the partition to remove, or NULL for a
* signature only match
* @sig: signature of the partition(s) to remove
+ * @exceptions: When removing all partitions with a matching signature,
+ * leave these alone.
*/
-int __init nvram_remove_partition(const char *name, int sig)
+int __init nvram_remove_partition(const char *name, int sig,
+ const char *exceptions[])
{
struct nvram_partition *part, *prev, *tmp;
int rc;
list_for_each_entry(part, &nvram_partitions, partition) {
- if (part->header.signature != sig)
- continue;
- if (name && strncmp(name, part->header.name, 12))
+ if (!nvram_can_remove_partition(part, name, sig, exceptions))
continue;
/* Make partition a free partition */