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kgdb patches for 6.7

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Just two patches for you this time!
 
  * During a panic, flush the console before entering kgdb. This makes
    things a little easier to comprehend, especially if an NMI backtrace
    was triggered on all CPUs just before we enter the panic routines.
  * Correcting a couple of misleading (a.k.a. plain wrong) comments.
 
 Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
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Merge tag 'kgdb-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux

Pull kgdb updates from Daniel Thompson:
 "Just two patches for you this time!

   - During a panic, flush the console before entering kgdb.

     This makes things a little easier to comprehend, especially if an
     NMI backtrace was triggered on all CPUs just before we enter the
     panic routines

   - Correcting a couple of misleading (a.k.a. plain wrong) comments"

* tag 'kgdb-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux:
  kdb: Corrects comment for kdballocenv
  kgdb: Flush console before entering kgdb on panic
This commit is contained in:
Linus Torvalds 2023-11-08 09:28:38 -08:00
commit c1ef4df14e
2 changed files with 6 additions and 4 deletions
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3
kernel/debug/debug_core.c
View file

@ -1006,6 +1006,9 @@ void kgdb_panic(const char *msg)
if (panic_timeout)
return;
debug_locks_off();
console_flush_on_panic(CONSOLE_FLUSH_PENDING);
if (dbg_kdb_mode)
kdb_printf("PANIC: %s\n", msg);

7
kernel/debug/kdb/kdb_main.c
View file

@ -272,11 +272,10 @@ char *kdbgetenv(const char *match)
* kdballocenv - This function is used to allocate bytes for
* environment entries.
* Parameters:
* match A character string representing a numeric value
* Outputs:
* *value the unsigned long representation of the env variable 'match'
* bytes The number of bytes to allocate in the static buffer.
* Returns:
* Zero on success, a kdb diagnostic on failure.
* A pointer to the allocated space in the buffer on success.
* NULL if bytes > size available in the envbuffer.
* Remarks:
* We use a static environment buffer (envbuffer) to hold the values
* of dynamically generated environment variables (see kdb_set). Buffer