* [ammarfaizi2-block:dhowells/linux-fs/fscache-next 36/39] fs/netfs/io.c:630:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is false
@ 2022-03-02 17:14 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-03-02 17:14 UTC (permalink / raw)
To: David Howells; +Cc: llvm, kbuild-all, GNU/Weeb Mailing List, linux-kernel
Hi David,
First bad commit (maybe != root cause):
tree: https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/fscache-next
head: 78e12b114b9c804d4b1eef16b6df1112cde6a960
commit: ad9e5adb388f358027a51032b3944913d98f7866 [36/39] netfs: Rename rename read_helper.c to io.c
config: hexagon-buildonly-randconfig-r006-20220302 (https://download.01.org/0day-ci/archive/20220303/[email protected]/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/ammarfaizi2/linux-block/commit/ad9e5adb388f358027a51032b3944913d98f7866
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/fscache-next
git checkout ad9e5adb388f358027a51032b3944913d98f7866
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash fs/netfs/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> fs/netfs/io.c:630:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
if (sync) {
^~~~~~~~~
include/linux/compiler.h:56:28: note: expanded from macro 'if'
#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var'
#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/netfs/io.c:655:9: note: uninitialized use occurs here
return ret;
^~~
fs/netfs/io.c:630:2: note: remove the 'if' if its condition is always true
if (sync) {
^~~~~~~~~~
include/linux/compiler.h:56:23: note: expanded from macro 'if'
#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
^
fs/netfs/io.c:604:9: note: initialize the variable 'ret' to silence this warning
int ret;
^
= 0
1 warning generated.
vim +630 fs/netfs/io.c
3d3c95046742e4 fs/netfs/read_helper.c David Howells 2020-05-13 595
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 596 /*
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 597 * Begin the process of reading in a chunk of data, where that data may be
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 598 * stitched together from multiple sources, including multiple servers and the
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 599 * local cache.
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 600 */
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 601 int netfs_begin_read(struct netfs_io_request *rreq, bool sync)
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 602 {
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 603 unsigned int debug_index = 0;
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 604 int ret;
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 605
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 606 _enter("R=%x %llx-%llx",
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 607 rreq->debug_id, rreq->start, rreq->start + rreq->len - 1);
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 608
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 609 if (rreq->len == 0) {
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 610 pr_err("Zero-sized read [R=%x]\n", rreq->debug_id);
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 611 netfs_put_request(rreq, false, netfs_rreq_trace_put_zero_len);
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 612 return -EIO;
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 613 }
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 614
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 615 rreq->work.func = netfs_rreq_work;
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 616
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 617 if (sync)
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 618 netfs_get_request(rreq, netfs_rreq_trace_get_hold);
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 619
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 620 /* Chop the read into slices according to what the cache and the netfs
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 621 * want and submit each one.
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 622 */
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 623 atomic_set(&rreq->nr_outstanding, 1);
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 624 do {
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 625 if (!netfs_rreq_submit_slice(rreq, &debug_index))
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 626 break;
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 627
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 628 } while (rreq->submitted < rreq->len);
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 629
c19a5d31b470e0 fs/netfs/read_helper.c David Howells 2022-03-02 @630 if (sync) {
:::::: The code at line 630 was first introduced by commit
:::::: c19a5d31b470e0a7dea07a71bb7b98a916b449e9 netfs: Add a function to consolidate beginning a read
:::::: TO: David Howells <[email protected]>
:::::: CC: David Howells <[email protected]>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
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2022-03-02 17:14 [ammarfaizi2-block:dhowells/linux-fs/fscache-next 36/39] fs/netfs/io.c:630:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is false kernel test robot
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