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Subject[PATCH 4/7] [elf-fdpic] coredump: don't bother with cyclic list for per-thread objects
Date
From: Al Viro <viro@zeniv.linux.org.uk>

plain single-linked list is just fine here...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index a6ee92137529..bcbf756fba39 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1453,7 +1453,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
/* Here is the structure in which status of each thread is captured. */
struct elf_thread_status
{
- struct list_head list;
+ struct elf_thread_status *next;
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
@@ -1578,8 +1578,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
struct memelfnote *notes = NULL;
struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
- LIST_HEAD(thread_list);
- struct list_head *t;
+ struct elf_thread_status *thread_list = NULL;
elf_fpregset_t *fpu = NULL;
int thread_status_size = 0;
elf_addr_t *auxv;
@@ -1627,15 +1626,12 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;

tmp->thread = ct->task;
- list_add(&tmp->list, &thread_list);
+ tmp->next = thread_list;
+ thread_list = tmp;
}

- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp;
- int sz;
-
- tmp = list_entry(t, struct elf_thread_status, list);
- sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
+ for (tmp = thread_list; tmp; tmp = tmp->next) {
+ int sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
thread_status_size += sz;
}

@@ -1760,10 +1756,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;

/* write out the thread status notes section */
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp =
- list_entry(t, struct elf_thread_status, list);
-
+ for (tmp = thread_list; tmp; tmp = tmp->next) {
for (i = 0; i < tmp->num_notes; i++)
if (!writenote(&tmp->notes[i], cprm))
goto end_coredump;
@@ -1791,10 +1784,10 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
}

end_coredump:
- while (!list_empty(&thread_list)) {
- struct list_head *tmp = thread_list.next;
- list_del(tmp);
- kfree(list_entry(tmp, struct elf_thread_status, list));
+ while (thread_list) {
+ tmp = thread_list;
+ thread_list = thread_list->next;
+ kfree(tmp);
}
kfree(phdr4note);
kfree(elf);
--
2.11.0
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