simple_strtoul() has caveat and is obsolete, use kstrtoul() instead in mmcg.
Signed-off-by: Keren Sun <kerensun@google.com>
---
mm/memcontrol-v1.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
index 5e1854623824..260b356cea5a 100644
--- a/mm/memcontrol-v1.c
+++ b/mm/memcontrol-v1.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-or-later
+#include "linux/kstrtox.h"
#include <linux/memcontrol.h>
#include <linux/swap.h>
#include <linux/mm_inline.h>
@@ -1922,17 +1923,15 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
buf = strstrip(buf);
- efd = simple_strtoul(buf, &endp, 10);
- if (*endp != ' ')
+ kstrtoul(buf, 10, efd);
+ if (*buf != ' ')
return -EINVAL;
- buf = endp + 1;
+ buf++;
- cfd = simple_strtoul(buf, &endp, 10);
- if (*endp == '\0')
- buf = endp;
- else if (*endp == ' ')
- buf = endp + 1;
- else
+ kstrtoul(buf, 10, cfd);
+ if (*buf == ' ')
+ buf++;
+ else if (*buf != '\0')
return -EINVAL;
event = kzalloc(sizeof(*event), GFP_KERNEL);
--
2.47.0.163.g1226f6d8fa-googOn Mon, Nov 04, 2024 at 02:27:37PM -0800, Keren Sun wrote:
> simple_strtoul() has caveat and is obsolete, use kstrtoul() instead in mmcg.
^^^^
?
Btw, did you test this code? Shakeel was poiting out that kstrtoul() might not
work here, is it false?
Thanks!
On Mon, Nov 04, 2024 at 02:27:37PM -0800, Keren Sun wrote: > simple_strtoul() has caveat and is obsolete, use kstrtoul() instead in mmcg. Did you test this patch? I don't think kstrtoul() can be used here as it expects a string containing a single number. > > Signed-off-by: Keren Sun <kerensun@google.com> > --- > mm/memcontrol-v1.c | 17 ++++++++--------- > 1 file changed, 8 insertions(+), 9 deletions(-) > > diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c > index 5e1854623824..260b356cea5a 100644 > --- a/mm/memcontrol-v1.c > +++ b/mm/memcontrol-v1.c > @@ -1,5 +1,6 @@ > // SPDX-License-Identifier: GPL-2.0-or-later > > +#include "linux/kstrtox.h" > #include <linux/memcontrol.h> > #include <linux/swap.h> > #include <linux/mm_inline.h> > @@ -1922,17 +1923,15 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of, > > buf = strstrip(buf); > > - efd = simple_strtoul(buf, &endp, 10); > - if (*endp != ' ') > + kstrtoul(buf, 10, efd); > + if (*buf != ' ') > return -EINVAL; > - buf = endp + 1; > + buf++; > > - cfd = simple_strtoul(buf, &endp, 10); > - if (*endp == '\0') > - buf = endp; > - else if (*endp == ' ') > - buf = endp + 1; > - else > + kstrtoul(buf, 10, cfd); > + if (*buf == ' ') > + buf++; > + else if (*buf != '\0') > return -EINVAL; > > event = kzalloc(sizeof(*event), GFP_KERNEL); > -- > 2.47.0.163.g1226f6d8fa-goog >
Hi Keren,
kernel test robot noticed the following build errors:
[auto build test ERROR on v6.12-rc6]
[also build test ERROR on linus/master]
[cannot apply to akpm-mm/mm-everything next-20241104]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Keren-Sun/mm-fix-quoted-strings-spliting-across-lines/20241105-063007
base: v6.12-rc6
patch link: https://lore.kernel.org/r/20241104222737.298130-5-kerensun%40google.com
patch subject: [PATCH 4/4] mm: Replace simple_strtoul() with kstrtoul()
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241105/202411051411.1N0Ziqjh-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241105/202411051411.1N0Ziqjh-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411051411.1N0Ziqjh-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
In file included from mm/memcontrol-v1.c:4:
In file included from include/linux/memcontrol.h:21:
In file included from include/linux/mm.h:2213:
include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
505 | item];
| ~~~~
include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
512 | NR_VM_NUMA_EVENT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~~
include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
518 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
525 | NR_VM_NUMA_EVENT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~~
In file included from mm/memcontrol-v1.c:6:
include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
| ~~~~~~~~~~~ ^ ~~~
include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
49 | NR_ZONE_LRU_BASE + lru, nr_pages);
| ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/memcontrol-v1.c:1926:20: error: incompatible integer to pointer conversion passing 'unsigned int' to parameter of type 'unsigned long *' [-Wint-conversion]
1926 | kstrtoul(buf, 10, efd);
| ^~~
include/linux/kstrtox.h:30:90: note: passing argument to parameter 'res' here
30 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
| ^
>> mm/memcontrol-v1.c:1926:2: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
1926 | kstrtoul(buf, 10, efd);
| ^~~~~~~~ ~~~~~~~~~~~~
mm/memcontrol-v1.c:1931:20: error: incompatible integer to pointer conversion passing 'unsigned int' to parameter of type 'unsigned long *' [-Wint-conversion]
1931 | kstrtoul(buf, 10, cfd);
| ^~~
include/linux/kstrtox.h:30:90: note: passing argument to parameter 'res' here
30 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
| ^
mm/memcontrol-v1.c:1931:2: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
1931 | kstrtoul(buf, 10, cfd);
| ^~~~~~~~ ~~~~~~~~~~~~
mm/memcontrol-v1.c:1918:8: warning: unused variable 'endp' [-Wunused-variable]
1918 | char *endp;
| ^~~~
mm/memcontrol-v1.c:2606:48: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
2606 | nr += lruvec_page_state(lruvec, NR_LRU_BASE + lru);
| ~~~~~~~~~~~ ^ ~~~
mm/memcontrol-v1.c:2608:54: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
2608 | nr += lruvec_page_state_local(lruvec, NR_LRU_BASE + lru);
| ~~~~~~~~~~~ ^ ~~~
mm/memcontrol-v1.c:2624:46: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
2624 | nr += memcg_page_state(memcg, NR_LRU_BASE + lru);
| ~~~~~~~~~~~ ^ ~~~
mm/memcontrol-v1.c:2626:52: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
2626 | nr += memcg_page_state_local(memcg, NR_LRU_BASE + lru);
| ~~~~~~~~~~~ ^ ~~~
13 warnings and 2 errors generated.
vim +1926 mm/memcontrol-v1.c
1897
1898 /*
1899 * DO NOT USE IN NEW FILES.
1900 *
1901 * Parse input and register new cgroup event handler.
1902 *
1903 * Input must be in format '<event_fd> <control_fd> <args>'.
1904 * Interpretation of args is defined by control file implementation.
1905 */
1906 static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
1907 char *buf, size_t nbytes, loff_t off)
1908 {
1909 struct cgroup_subsys_state *css = of_css(of);
1910 struct mem_cgroup *memcg = mem_cgroup_from_css(css);
1911 struct mem_cgroup_event *event;
1912 struct cgroup_subsys_state *cfile_css;
1913 unsigned int efd, cfd;
1914 struct fd efile;
1915 struct fd cfile;
1916 struct dentry *cdentry;
1917 const char *name;
1918 char *endp;
1919 int ret;
1920
1921 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1922 return -EOPNOTSUPP;
1923
1924 buf = strstrip(buf);
1925
> 1926 kstrtoul(buf, 10, efd);
1927 if (*buf != ' ')
1928 return -EINVAL;
1929 buf++;
1930
1931 kstrtoul(buf, 10, cfd);
1932 if (*buf == ' ')
1933 buf++;
1934 else if (*buf != '\0')
1935 return -EINVAL;
1936
1937 event = kzalloc(sizeof(*event), GFP_KERNEL);
1938 if (!event)
1939 return -ENOMEM;
1940
1941 event->memcg = memcg;
1942 INIT_LIST_HEAD(&event->list);
1943 init_poll_funcptr(&event->pt, memcg_event_ptable_queue_proc);
1944 init_waitqueue_func_entry(&event->wait, memcg_event_wake);
1945 INIT_WORK(&event->remove, memcg_event_remove);
1946
1947 efile = fdget(efd);
1948 if (!fd_file(efile)) {
1949 ret = -EBADF;
1950 goto out_kfree;
1951 }
1952
1953 event->eventfd = eventfd_ctx_fileget(fd_file(efile));
1954 if (IS_ERR(event->eventfd)) {
1955 ret = PTR_ERR(event->eventfd);
1956 goto out_put_efile;
1957 }
1958
1959 cfile = fdget(cfd);
1960 if (!fd_file(cfile)) {
1961 ret = -EBADF;
1962 goto out_put_eventfd;
1963 }
1964
1965 /* the process need read permission on control file */
1966 /* AV: shouldn't we check that it's been opened for read instead? */
1967 ret = file_permission(fd_file(cfile), MAY_READ);
1968 if (ret < 0)
1969 goto out_put_cfile;
1970
1971 /*
1972 * The control file must be a regular cgroup1 file. As a regular cgroup
1973 * file can't be renamed, it's safe to access its name afterwards.
1974 */
1975 cdentry = fd_file(cfile)->f_path.dentry;
1976 if (cdentry->d_sb->s_type != &cgroup_fs_type || !d_is_reg(cdentry)) {
1977 ret = -EINVAL;
1978 goto out_put_cfile;
1979 }
1980
1981 /*
1982 * Determine the event callbacks and set them in @event. This used
1983 * to be done via struct cftype but cgroup core no longer knows
1984 * about these events. The following is crude but the whole thing
1985 * is for compatibility anyway.
1986 *
1987 * DO NOT ADD NEW FILES.
1988 */
1989 name = cdentry->d_name.name;
1990
1991 if (!strcmp(name, "memory.usage_in_bytes")) {
1992 event->register_event = mem_cgroup_usage_register_event;
1993 event->unregister_event = mem_cgroup_usage_unregister_event;
1994 } else if (!strcmp(name, "memory.oom_control")) {
1995 pr_warn_once("oom_control is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality.\n");
1996 event->register_event = mem_cgroup_oom_register_event;
1997 event->unregister_event = mem_cgroup_oom_unregister_event;
1998 } else if (!strcmp(name, "memory.pressure_level")) {
1999 pr_warn_once("pressure_level is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality.\n");
2000 event->register_event = vmpressure_register_event;
2001 event->unregister_event = vmpressure_unregister_event;
2002 } else if (!strcmp(name, "memory.memsw.usage_in_bytes")) {
2003 event->register_event = memsw_cgroup_usage_register_event;
2004 event->unregister_event = memsw_cgroup_usage_unregister_event;
2005 } else {
2006 ret = -EINVAL;
2007 goto out_put_cfile;
2008 }
2009
2010 /*
2011 * Verify @cfile should belong to @css. Also, remaining events are
2012 * automatically removed on cgroup destruction but the removal is
2013 * asynchronous, so take an extra ref on @css.
2014 */
2015 cfile_css = css_tryget_online_from_dir(cdentry->d_parent,
2016 &memory_cgrp_subsys);
2017 ret = -EINVAL;
2018 if (IS_ERR(cfile_css))
2019 goto out_put_cfile;
2020 if (cfile_css != css) {
2021 css_put(cfile_css);
2022 goto out_put_cfile;
2023 }
2024
2025 ret = event->register_event(memcg, event->eventfd, buf);
2026 if (ret)
2027 goto out_put_css;
2028
2029 vfs_poll(fd_file(efile), &event->pt);
2030
2031 spin_lock_irq(&memcg->event_list_lock);
2032 list_add(&event->list, &memcg->event_list);
2033 spin_unlock_irq(&memcg->event_list_lock);
2034
2035 fdput(cfile);
2036 fdput(efile);
2037
2038 return nbytes;
2039
2040 out_put_css:
2041 css_put(css);
2042 out_put_cfile:
2043 fdput(cfile);
2044 out_put_eventfd:
2045 eventfd_ctx_put(event->eventfd);
2046 out_put_efile:
2047 fdput(efile);
2048 out_kfree:
2049 kfree(event);
2050
2051 return ret;
2052 }
2053
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Keren,
kernel test robot noticed the following build errors:
[auto build test ERROR on v6.12-rc6]
[also build test ERROR on linus/master]
[cannot apply to akpm-mm/mm-everything next-20241104]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Keren-Sun/mm-fix-quoted-strings-spliting-across-lines/20241105-063007
base: v6.12-rc6
patch link: https://lore.kernel.org/r/20241104222737.298130-5-kerensun%40google.com
patch subject: [PATCH 4/4] mm: Replace simple_strtoul() with kstrtoul()
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20241105/202411051248.C33eJ43V-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241105/202411051248.C33eJ43V-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411051248.C33eJ43V-lkp@intel.com/
All errors (new ones prefixed by >>):
mm/memcontrol-v1.c: In function 'memcg_write_event_control':
>> mm/memcontrol-v1.c:1926:27: error: passing argument 3 of 'kstrtoul' makes pointer from integer without a cast [-Wint-conversion]
1926 | kstrtoul(buf, 10, efd);
| ^~~
| |
| unsigned int
In file included from mm/memcontrol-v1.c:3:
include/linux/kstrtox.h:30:90: note: expected 'long unsigned int *' but argument is of type 'unsigned int'
30 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
| ~~~~~~~~~~~~~~~^~~
mm/memcontrol-v1.c:1931:27: error: passing argument 3 of 'kstrtoul' makes pointer from integer without a cast [-Wint-conversion]
1931 | kstrtoul(buf, 10, cfd);
| ^~~
| |
| unsigned int
include/linux/kstrtox.h:30:90: note: expected 'long unsigned int *' but argument is of type 'unsigned int'
30 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
| ~~~~~~~~~~~~~~~^~~
mm/memcontrol-v1.c:1918:15: warning: unused variable 'endp' [-Wunused-variable]
1918 | char *endp;
| ^~~~
mm/memcontrol-v1.c:1926:9: warning: ignoring return value of 'kstrtoul' declared with attribute 'warn_unused_result' [-Wunused-result]
1926 | kstrtoul(buf, 10, efd);
| ^~~~~~~~~~~~~~~~~~~~~~
mm/memcontrol-v1.c:1931:9: warning: ignoring return value of 'kstrtoul' declared with attribute 'warn_unused_result' [-Wunused-result]
1931 | kstrtoul(buf, 10, cfd);
| ^~~~~~~~~~~~~~~~~~~~~~
vim +/kstrtoul +1926 mm/memcontrol-v1.c
1897
1898 /*
1899 * DO NOT USE IN NEW FILES.
1900 *
1901 * Parse input and register new cgroup event handler.
1902 *
1903 * Input must be in format '<event_fd> <control_fd> <args>'.
1904 * Interpretation of args is defined by control file implementation.
1905 */
1906 static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
1907 char *buf, size_t nbytes, loff_t off)
1908 {
1909 struct cgroup_subsys_state *css = of_css(of);
1910 struct mem_cgroup *memcg = mem_cgroup_from_css(css);
1911 struct mem_cgroup_event *event;
1912 struct cgroup_subsys_state *cfile_css;
1913 unsigned int efd, cfd;
1914 struct fd efile;
1915 struct fd cfile;
1916 struct dentry *cdentry;
1917 const char *name;
1918 char *endp;
1919 int ret;
1920
1921 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1922 return -EOPNOTSUPP;
1923
1924 buf = strstrip(buf);
1925
> 1926 kstrtoul(buf, 10, efd);
1927 if (*buf != ' ')
1928 return -EINVAL;
1929 buf++;
1930
1931 kstrtoul(buf, 10, cfd);
1932 if (*buf == ' ')
1933 buf++;
1934 else if (*buf != '\0')
1935 return -EINVAL;
1936
1937 event = kzalloc(sizeof(*event), GFP_KERNEL);
1938 if (!event)
1939 return -ENOMEM;
1940
1941 event->memcg = memcg;
1942 INIT_LIST_HEAD(&event->list);
1943 init_poll_funcptr(&event->pt, memcg_event_ptable_queue_proc);
1944 init_waitqueue_func_entry(&event->wait, memcg_event_wake);
1945 INIT_WORK(&event->remove, memcg_event_remove);
1946
1947 efile = fdget(efd);
1948 if (!fd_file(efile)) {
1949 ret = -EBADF;
1950 goto out_kfree;
1951 }
1952
1953 event->eventfd = eventfd_ctx_fileget(fd_file(efile));
1954 if (IS_ERR(event->eventfd)) {
1955 ret = PTR_ERR(event->eventfd);
1956 goto out_put_efile;
1957 }
1958
1959 cfile = fdget(cfd);
1960 if (!fd_file(cfile)) {
1961 ret = -EBADF;
1962 goto out_put_eventfd;
1963 }
1964
1965 /* the process need read permission on control file */
1966 /* AV: shouldn't we check that it's been opened for read instead? */
1967 ret = file_permission(fd_file(cfile), MAY_READ);
1968 if (ret < 0)
1969 goto out_put_cfile;
1970
1971 /*
1972 * The control file must be a regular cgroup1 file. As a regular cgroup
1973 * file can't be renamed, it's safe to access its name afterwards.
1974 */
1975 cdentry = fd_file(cfile)->f_path.dentry;
1976 if (cdentry->d_sb->s_type != &cgroup_fs_type || !d_is_reg(cdentry)) {
1977 ret = -EINVAL;
1978 goto out_put_cfile;
1979 }
1980
1981 /*
1982 * Determine the event callbacks and set them in @event. This used
1983 * to be done via struct cftype but cgroup core no longer knows
1984 * about these events. The following is crude but the whole thing
1985 * is for compatibility anyway.
1986 *
1987 * DO NOT ADD NEW FILES.
1988 */
1989 name = cdentry->d_name.name;
1990
1991 if (!strcmp(name, "memory.usage_in_bytes")) {
1992 event->register_event = mem_cgroup_usage_register_event;
1993 event->unregister_event = mem_cgroup_usage_unregister_event;
1994 } else if (!strcmp(name, "memory.oom_control")) {
1995 pr_warn_once("oom_control is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality.\n");
1996 event->register_event = mem_cgroup_oom_register_event;
1997 event->unregister_event = mem_cgroup_oom_unregister_event;
1998 } else if (!strcmp(name, "memory.pressure_level")) {
1999 pr_warn_once("pressure_level is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality.\n");
2000 event->register_event = vmpressure_register_event;
2001 event->unregister_event = vmpressure_unregister_event;
2002 } else if (!strcmp(name, "memory.memsw.usage_in_bytes")) {
2003 event->register_event = memsw_cgroup_usage_register_event;
2004 event->unregister_event = memsw_cgroup_usage_unregister_event;
2005 } else {
2006 ret = -EINVAL;
2007 goto out_put_cfile;
2008 }
2009
2010 /*
2011 * Verify @cfile should belong to @css. Also, remaining events are
2012 * automatically removed on cgroup destruction but the removal is
2013 * asynchronous, so take an extra ref on @css.
2014 */
2015 cfile_css = css_tryget_online_from_dir(cdentry->d_parent,
2016 &memory_cgrp_subsys);
2017 ret = -EINVAL;
2018 if (IS_ERR(cfile_css))
2019 goto out_put_cfile;
2020 if (cfile_css != css) {
2021 css_put(cfile_css);
2022 goto out_put_cfile;
2023 }
2024
2025 ret = event->register_event(memcg, event->eventfd, buf);
2026 if (ret)
2027 goto out_put_css;
2028
2029 vfs_poll(fd_file(efile), &event->pt);
2030
2031 spin_lock_irq(&memcg->event_list_lock);
2032 list_add(&event->list, &memcg->event_list);
2033 spin_unlock_irq(&memcg->event_list_lock);
2034
2035 fdput(cfile);
2036 fdput(efile);
2037
2038 return nbytes;
2039
2040 out_put_css:
2041 css_put(css);
2042 out_put_cfile:
2043 fdput(cfile);
2044 out_put_eventfd:
2045 eventfd_ctx_put(event->eventfd);
2046 out_put_efile:
2047 fdput(efile);
2048 out_kfree:
2049 kfree(event);
2050
2051 return ret;
2052 }
2053
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Keren,
kernel test robot noticed the following build warnings:
[auto build test WARNING on v6.12-rc6]
[also build test WARNING on linus/master]
[cannot apply to akpm-mm/mm-everything next-20241104]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Keren-Sun/mm-fix-quoted-strings-spliting-across-lines/20241105-063007
base: v6.12-rc6
patch link: https://lore.kernel.org/r/20241104222737.298130-5-kerensun%40google.com
patch subject: [PATCH 4/4] mm: Replace simple_strtoul() with kstrtoul()
config: arc-randconfig-001-20241105 (https://download.01.org/0day-ci/archive/20241105/202411051219.uj1XBcp1-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241105/202411051219.uj1XBcp1-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411051219.uj1XBcp1-lkp@intel.com/
All warnings (new ones prefixed by >>):
mm/memcontrol-v1.c: In function 'memcg_write_event_control':
>> mm/memcontrol-v1.c:1926:27: warning: passing argument 3 of 'kstrtoul' makes pointer from integer without a cast [-Wint-conversion]
1926 | kstrtoul(buf, 10, efd);
| ^~~
| |
| unsigned int
In file included from mm/memcontrol-v1.c:3:
include/linux/kstrtox.h:30:90: note: expected 'long unsigned int *' but argument is of type 'unsigned int'
30 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
| ~~~~~~~~~~~~~~~^~~
mm/memcontrol-v1.c:1931:27: warning: passing argument 3 of 'kstrtoul' makes pointer from integer without a cast [-Wint-conversion]
1931 | kstrtoul(buf, 10, cfd);
| ^~~
| |
| unsigned int
include/linux/kstrtox.h:30:90: note: expected 'long unsigned int *' but argument is of type 'unsigned int'
30 | static inline int __must_check kstrtoul(const char *s, unsigned int base, unsigned long *res)
| ~~~~~~~~~~~~~~~^~~
>> mm/memcontrol-v1.c:1918:15: warning: unused variable 'endp' [-Wunused-variable]
1918 | char *endp;
| ^~~~
>> mm/memcontrol-v1.c:1926:9: warning: ignoring return value of 'kstrtoul' declared with attribute 'warn_unused_result' [-Wunused-result]
1926 | kstrtoul(buf, 10, efd);
| ^~~~~~~~~~~~~~~~~~~~~~
mm/memcontrol-v1.c:1931:9: warning: ignoring return value of 'kstrtoul' declared with attribute 'warn_unused_result' [-Wunused-result]
1931 | kstrtoul(buf, 10, cfd);
| ^~~~~~~~~~~~~~~~~~~~~~
>> mm/memcontrol-v1.c:1926:9: warning: 'efd' is used uninitialized [-Wuninitialized]
1926 | kstrtoul(buf, 10, efd);
| ^~~~~~~~~~~~~~~~~~~~~~
mm/memcontrol-v1.c:1913:22: note: 'efd' was declared here
1913 | unsigned int efd, cfd;
| ^~~
vim +/kstrtoul +1926 mm/memcontrol-v1.c
1897
1898 /*
1899 * DO NOT USE IN NEW FILES.
1900 *
1901 * Parse input and register new cgroup event handler.
1902 *
1903 * Input must be in format '<event_fd> <control_fd> <args>'.
1904 * Interpretation of args is defined by control file implementation.
1905 */
1906 static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
1907 char *buf, size_t nbytes, loff_t off)
1908 {
1909 struct cgroup_subsys_state *css = of_css(of);
1910 struct mem_cgroup *memcg = mem_cgroup_from_css(css);
1911 struct mem_cgroup_event *event;
1912 struct cgroup_subsys_state *cfile_css;
1913 unsigned int efd, cfd;
1914 struct fd efile;
1915 struct fd cfile;
1916 struct dentry *cdentry;
1917 const char *name;
> 1918 char *endp;
1919 int ret;
1920
1921 if (IS_ENABLED(CONFIG_PREEMPT_RT))
1922 return -EOPNOTSUPP;
1923
1924 buf = strstrip(buf);
1925
> 1926 kstrtoul(buf, 10, efd);
1927 if (*buf != ' ')
1928 return -EINVAL;
1929 buf++;
1930
> 1931 kstrtoul(buf, 10, cfd);
1932 if (*buf == ' ')
1933 buf++;
1934 else if (*buf != '\0')
1935 return -EINVAL;
1936
1937 event = kzalloc(sizeof(*event), GFP_KERNEL);
1938 if (!event)
1939 return -ENOMEM;
1940
1941 event->memcg = memcg;
1942 INIT_LIST_HEAD(&event->list);
1943 init_poll_funcptr(&event->pt, memcg_event_ptable_queue_proc);
1944 init_waitqueue_func_entry(&event->wait, memcg_event_wake);
1945 INIT_WORK(&event->remove, memcg_event_remove);
1946
1947 efile = fdget(efd);
1948 if (!fd_file(efile)) {
1949 ret = -EBADF;
1950 goto out_kfree;
1951 }
1952
1953 event->eventfd = eventfd_ctx_fileget(fd_file(efile));
1954 if (IS_ERR(event->eventfd)) {
1955 ret = PTR_ERR(event->eventfd);
1956 goto out_put_efile;
1957 }
1958
1959 cfile = fdget(cfd);
1960 if (!fd_file(cfile)) {
1961 ret = -EBADF;
1962 goto out_put_eventfd;
1963 }
1964
1965 /* the process need read permission on control file */
1966 /* AV: shouldn't we check that it's been opened for read instead? */
1967 ret = file_permission(fd_file(cfile), MAY_READ);
1968 if (ret < 0)
1969 goto out_put_cfile;
1970
1971 /*
1972 * The control file must be a regular cgroup1 file. As a regular cgroup
1973 * file can't be renamed, it's safe to access its name afterwards.
1974 */
1975 cdentry = fd_file(cfile)->f_path.dentry;
1976 if (cdentry->d_sb->s_type != &cgroup_fs_type || !d_is_reg(cdentry)) {
1977 ret = -EINVAL;
1978 goto out_put_cfile;
1979 }
1980
1981 /*
1982 * Determine the event callbacks and set them in @event. This used
1983 * to be done via struct cftype but cgroup core no longer knows
1984 * about these events. The following is crude but the whole thing
1985 * is for compatibility anyway.
1986 *
1987 * DO NOT ADD NEW FILES.
1988 */
1989 name = cdentry->d_name.name;
1990
1991 if (!strcmp(name, "memory.usage_in_bytes")) {
1992 event->register_event = mem_cgroup_usage_register_event;
1993 event->unregister_event = mem_cgroup_usage_unregister_event;
1994 } else if (!strcmp(name, "memory.oom_control")) {
1995 pr_warn_once("oom_control is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality.\n");
1996 event->register_event = mem_cgroup_oom_register_event;
1997 event->unregister_event = mem_cgroup_oom_unregister_event;
1998 } else if (!strcmp(name, "memory.pressure_level")) {
1999 pr_warn_once("pressure_level is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality.\n");
2000 event->register_event = vmpressure_register_event;
2001 event->unregister_event = vmpressure_unregister_event;
2002 } else if (!strcmp(name, "memory.memsw.usage_in_bytes")) {
2003 event->register_event = memsw_cgroup_usage_register_event;
2004 event->unregister_event = memsw_cgroup_usage_unregister_event;
2005 } else {
2006 ret = -EINVAL;
2007 goto out_put_cfile;
2008 }
2009
2010 /*
2011 * Verify @cfile should belong to @css. Also, remaining events are
2012 * automatically removed on cgroup destruction but the removal is
2013 * asynchronous, so take an extra ref on @css.
2014 */
2015 cfile_css = css_tryget_online_from_dir(cdentry->d_parent,
2016 &memory_cgrp_subsys);
2017 ret = -EINVAL;
2018 if (IS_ERR(cfile_css))
2019 goto out_put_cfile;
2020 if (cfile_css != css) {
2021 css_put(cfile_css);
2022 goto out_put_cfile;
2023 }
2024
2025 ret = event->register_event(memcg, event->eventfd, buf);
2026 if (ret)
2027 goto out_put_css;
2028
2029 vfs_poll(fd_file(efile), &event->pt);
2030
2031 spin_lock_irq(&memcg->event_list_lock);
2032 list_add(&event->list, &memcg->event_list);
2033 spin_unlock_irq(&memcg->event_list_lock);
2034
2035 fdput(cfile);
2036 fdput(efile);
2037
2038 return nbytes;
2039
2040 out_put_css:
2041 css_put(css);
2042 out_put_cfile:
2043 fdput(cfile);
2044 out_put_eventfd:
2045 eventfd_ctx_put(event->eventfd);
2046 out_put_efile:
2047 fdput(efile);
2048 out_kfree:
2049 kfree(event);
2050
2051 return ret;
2052 }
2053
--
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