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Commit 93ee4b7d authored by Kees Cook's avatar Kees Cook
Browse files

pstore/ram: Avoid needless alloc during header write 



Since the header is a fixed small maximum size, just use a stack variable
to avoid memory allocation in the write path.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 47afd7ae

fs/pstore/ram.c

+3 −7
Original line number Diff line number Diff line
@@ -345,19 +345,15 @@ static ssize_t ramoops_pstore_read(struct pstore_record *record) 
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,

				     struct pstore_record *record)

{

	char *hdr;

	char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */

	size_t len;



	hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",

	len = scnprintf(hdr, sizeof(hdr),

		RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",

		(time64_t)record->time.tv_sec,

		record->time.tv_nsec / 1000,

		record->compressed ? 'C' : 'D');

	if (WARN_ON_ONCE(!hdr))

		return 0;



	len = strlen(hdr);

	persistent_ram_write(prz, hdr, len);

	kfree(hdr);



	return len;

}