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authorGuilherme G. Piccoli <gpiccoli@igalia.com>2022-10-06 19:42:06 -0300
committerKees Cook <keescook@chromium.org>2022-10-17 13:14:10 -0700
commit8f5de3fd38b7e64112017bb1630f9df6e1b3331d (patch)
tree145e7c0c2d74de6b654996d7bc58d222366b4187 /fs/pstore
parentd85644dc5cf4023bf1a325f476d58a16bcc0798b (diff)
pstore: Expose kmsg_bytes as a module parameter
Currently this tuning is only exposed as a filesystem option, but most Linux distros automatically mount pstore, hence changing this setting requires remounting it. Also, if that mount option wasn't explicitly set it doesn't show up in mount information, so users cannot check what is the current value of kmsg_bytes. Let's then expose it as a module parameter, allowing both user visibility at all times (even if not manually set) and also the possibility of setting that as a boot/module parameter. Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20221006224212.569555-3-gpiccoli@igalia.com
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/platform.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c32957e4b256..be05090076ce 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -89,6 +89,11 @@ static char *compress =
module_param(compress, charp, 0444);
MODULE_PARM_DESC(compress, "compression to use");
+/* How much of the kernel log to snapshot */
+unsigned long kmsg_bytes = CONFIG_PSTORE_DEFAULT_KMSG_BYTES;
+module_param(kmsg_bytes, ulong, 0444);
+MODULE_PARM_DESC(kmsg_bytes, "amount of kernel log to snapshot (in bytes)");
+
/* Compression parameters */
static struct crypto_comp *tfm;
@@ -100,9 +105,6 @@ struct pstore_zbackend {
static char *big_oops_buf;
static size_t big_oops_buf_sz;
-/* How much of the console log to snapshot */
-unsigned long kmsg_bytes = CONFIG_PSTORE_DEFAULT_KMSG_BYTES;
-
void pstore_set_kmsg_bytes(int bytes)
{
kmsg_bytes = bytes;