path: root/fs
diff options
authorArnd Bergmann <>2018-05-30 17:24:52 +0200
committerArnd Bergmann <>2018-06-14 14:57:24 +0200
commite264abeaf9daa3cde9aed8013a6f82b0370425e5 (patch)
treee11ce1df54e768acc17b5d20e0812cde0fc4e5b7 /fs
parent15eefe2a99b2b208f512047e7bc404c3efcf0a44 (diff)
pstore: Remove bogus format string definition
The pstore conversion to timespec64 introduces its own method of passing seconds into sscanf() and sprintf() type functions to work around the timespec64 definition on 64-bit systems that redefine it to 'timespec'. That hack is now finally getting removed, but that means we get a (harmless) warning once both patches are merged: fs/pstore/ram.c: In function 'ramoops_read_kmsg_hdr': fs/pstore/ram.c:39:29: error: format '%ld' expects argument of type 'long int *', but argument 3 has type 'time64_t *' {aka 'long long int *'} [-Werror=format=] #define RAMOOPS_KERNMSG_HDR "====" ^~~~~~ fs/pstore/ram.c:167:21: note: in expansion of macro 'RAMOOPS_KERNMSG_HDR' This removes the pstore specific workaround and uses the same method that we have in place for all other functions that print a timespec64. Related to this, I found that the kasprintf() output contains an incorrect nanosecond values for any number starting with zeroes, and I adapt the format string accordingly. Link: Link: Fixes: 0f0d83b99ef7 ("pstore: Convert internal records to timespec64") Acked-by: Kees Cook <> Signed-off-by: Arnd Bergmann <>
Diffstat (limited to 'fs')
1 files changed, 6 insertions, 11 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 69e893076ab7..bbd1e357c23d 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -38,11 +38,6 @@
#define RAMOOPS_KERNMSG_HDR "===="
#define MIN_MEM_SIZE 4096UL
-#if __BITS_PER_LONG == 64
-# define TVSEC_FMT "%ld"
-# define TVSEC_FMT "%lld"
static ulong record_size = MIN_MEM_SIZE;
module_param(record_size, ulong, 0400);
@@ -164,15 +159,15 @@ static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time,
char data_type;
int header_length = 0;
- if (sscanf(buffer, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu-%c\n%n",
- &time->tv_sec, &time->tv_nsec, &data_type,
+ if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n",
+ (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type,
&header_length) == 3) {
if (data_type == 'C')
*compressed = true;
*compressed = false;
- } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu\n%n",
- &time->tv_sec, &time->tv_nsec,
+ } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n",
+ (time64_t *)&time->tv_sec, &time->tv_nsec,
&header_length) == 2) {
*compressed = false;
} else {
@@ -367,8 +362,8 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
char *hdr;
size_t len;
- hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu-%c\n",
- record->time.tv_sec,
+ hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",
+ (time64_t)record->time.tv_sec,
record->time.tv_nsec / 1000,
record->compressed ? 'C' : 'D');