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author | Jim Keniston <jkenisto@linux.vnet.ibm.com> | 2011-02-09 12:43:13 +0000 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-03-04 18:19:04 +1100 |
commit | 0f4ac132365e56802cbe377313491aa84086371c (patch) | |
tree | 447b5da68f7c3160bbe9c9262f0ed337a2008d57 /arch/powerpc/kernel/nvram_64.c | |
parent | 6dd227002972be910c6191f38f8641e01796557f (diff) | |
download | linux-0f4ac132365e56802cbe377313491aa84086371c.tar.bz2 |
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.c | 31 |
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 */ |