diff options
| author | Kees Cook <keescook@chromium.org> | 2019-02-12 13:09:36 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2019-02-12 13:45:53 -0800 |
| commit | 93ee4b7d9f0632690713aee604c49e298e634094 (patch) | |
| tree | b59d6703ee660577abbb1f3de464f2482a6962da /fs/pstore | |
| parent | 47afd7ae65c737bfef67e9eb1424723d13b06787 (diff) | |
| download | lwn-93ee4b7d9f0632690713aee604c49e298e634094.tar.gz lwn-93ee4b7d9f0632690713aee604c49e298e634094.zip | |
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: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore')
| -rw-r--r-- | fs/pstore/ram.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index ec0e1da0596a..c5c685589e36 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -345,19 +345,15 @@ out: 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; } |