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Code Issues Releases Wiki Activity

kallsyms: Fix scheduling with interrupts disabled in self-test 

kallsyms_on_each* may schedule so must not be called with interrupts
disabled. The iteration function could disable interrupts, but this
also changes lookup_symbol() to match the change to the other timing
code.

Reported-by: Erhard F. <erhard_f@mailbox.org>
Link: https://lore.kernel.org/all/bug-216902-206035@https.bugzilla.kernel.org%2F/
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/oe-lkp/202212251728.8d0872ff-oliver.sang@intel.com
Fixes: 30f3bb0977 ("kallsyms: Add self-test facility")
Tested-by: "Erhard F." <erhard_f@mailbox.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Nicholas Piggin 2023-01-12 20:54:26 +10:00 committed by Luis Chamberlain
parent 88603b6dc4
commit da35048f26
1 changed files with 6 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
kernel/kallsyms_selftest.c
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@ -157,14 +157,11 @@ static void test_kallsyms_compression_ratio(void)
static int lookup_name(void *data, const char *name, struct module *mod, unsigned long addr)
{
u64 t0, t1, t;
unsigned long flags;
struct test_stat *stat = (struct test_stat *)data;
local_irq_save(flags);
t0 = sched_clock();
t0 = ktime_get_ns();
(void)kallsyms_lookup_name(name);
t1 = sched_clock();
local_irq_restore(flags);
t1 = ktime_get_ns();
t = t1 - t0;
if (t < stat->min)
@ -234,18 +231,15 @@ static int find_symbol(void *data, const char *name, struct module *mod, unsigne
static void test_perf_kallsyms_on_each_symbol(void)
{
u64 t0, t1;
unsigned long flags;
struct test_stat stat;
memset(&stat, 0, sizeof(stat));
stat.max = INT_MAX;
stat.name = stub_name;
stat.perf = 1;
local_irq_save(flags);
t0 = sched_clock();
t0 = ktime_get_ns();
kallsyms_on_each_symbol(find_symbol, &stat);
t1 = sched_clock();
local_irq_restore(flags);
t1 = ktime_get_ns();
pr_info("kallsyms_on_each_symbol() traverse all: %lld ns\n", t1 - t0);
}
@ -270,17 +264,14 @@ static int match_symbol(void *data, unsigned long addr)
static void test_perf_kallsyms_on_each_match_symbol(void)
{
u64 t0, t1;
unsigned long flags;
struct test_stat stat;
memset(&stat, 0, sizeof(stat));
stat.max = INT_MAX;
stat.name = stub_name;
local_irq_save(flags);
t0 = sched_clock();
t0 = ktime_get_ns();
kallsyms_on_each_match_symbol(match_symbol, stat.name, &stat);
t1 = sched_clock();
local_irq_restore(flags);
t1 = ktime_get_ns();
pr_info("kallsyms_on_each_match_symbol() traverse all: %lld ns\n", t1 - t0);
}