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printk changes for 5.12

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Merge tag 'printk-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - New "no_hash_pointers" kernel parameter causes that %p shows raw
   pointer values instead of hashed ones. It is intended only for
   debugging purposes. Misuse is prevented by a fat warning message that
   is inspired by trace_printk().

 - Prevent a possible deadlock when flushing printk_safe buffers during
   panic().

 - Fix performance regression caused by the lockless printk ringbuffer.
   It was visible with huge log buffer and long messages.

 - Documentation fix-up.

* tag 'printk-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  lib/vsprintf: no_hash_pointers prints all addresses as unhashed
  kselftest: add support for skipped tests
  lib: use KSTM_MODULE_GLOBALS macro in kselftest drivers
  printk: avoid prb_first_valid_seq() where possible
  printk: fix deadlock when kernel panic
  printk: rectify kernel-doc for prb_rec_init_wr()
This commit is contained in:
Linus Torvalds 2021-02-22 11:04:36 -08:00
commit b2bec7d8a4
8 changed files with 103 additions and 27 deletions
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12
lib/test_printf.c
View file

@ -30,11 +30,13 @@
#define PAD_SIZE 16
#define FILL_CHAR '$'
static unsigned total_tests __initdata;
static unsigned failed_tests __initdata;
KSTM_MODULE_GLOBALS();
static char *test_buffer __initdata;
static char *alloced_buffer __initdata;
extern bool no_hash_pointers;
static int __printf(4, 0) __init
do_test(int bufsize, const char *expect, int elen,
const char *fmt, va_list ap)
@ -301,6 +303,12 @@ plain(void)
{
int err;
if (no_hash_pointers) {
pr_warn("skipping plain 'p' tests");
skipped_tests += 2;
return;
}
err = plain_hash();
if (err) {
pr_warn("plain 'p' does not appear to be hashed\n");