From: Aruna Balakrishnaiah Date: Fri, 16 Aug 2013 20:53:49 +0000 (-0700) Subject: powerpc/pseries: Read and write to the 'compressed' flag of pstore X-Git-Tag: next-20130822~118^2^2~3 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=40594264bd622e0865a981f14b98d9e09bc50b14;p=karo-tx-linux.git powerpc/pseries: Read and write to the 'compressed' flag of pstore If data returned from pstore is compressed, nvram's write callback will add a flag ERR_TYPE_KERNEL_PANIC_GZ indicating the data is compressed while writing to nvram. If the data read from nvram is compressed, nvram's read callback will set the flag 'compressed'. The patch adds backward compatibilty with old format oops header when reading from pstore. Signed-off-by: Aruna Balakrishnaiah Reviewed-by: Kees Cook Signed-off-by: Tony Luck --- diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c index 6c4dc52ac0b5..d276cd3edd8f 100644 --- a/arch/powerpc/platforms/pseries/nvram.c +++ b/arch/powerpc/platforms/pseries/nvram.c @@ -581,6 +581,9 @@ static int nvram_pstore_write(enum pstore_type_id type, oops_hdr->report_length = (u16) size; oops_hdr->timestamp = get_seconds(); + if (compressed) + err_type = ERR_TYPE_KERNEL_PANIC_GZ; + rc = nvram_write_os_partition(&oops_log_partition, oops_buf, (int) (sizeof(*oops_hdr) + size), err_type, count); @@ -687,6 +690,11 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type, return -ENOMEM; memcpy(*buf, buff + hdr_size, length); kfree(buff); + + if (err_type == ERR_TYPE_KERNEL_PANIC_GZ) + *compressed = true; + else + *compressed = false; return length; }