diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2022-09-26 15:56:20 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-28 19:22:13 +1000 |
| commit | e1100cee059ad0bea6a668177e835baa087a0c65 (patch) | |
| tree | 30d137b21beef7499d9fcc7d27a4cc9199e33b84 /arch/powerpc/kernel/setup_64.c | |
| parent | 519b2e317e39ac99ce589a7c8480c47a17d62638 (diff) | |
powerpc/64s/interrupt: halt early boot interrupts if paca is not set up
Ensure r13 is zero from very early in boot until it gets set to the
boot paca pointer. This allows early program and mce handlers to halt
if there is no valid paca, rather than potentially run off into the
weeds. This preserves register and memory contents for low level
debugging tools.
Nothing could be printed to console at this point in any case because
even udbg is only set up after the boot paca is set, so this shouldn't
be missed.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926055620.2676869-6-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/setup_64.c')
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 6312a3fe8eff..a0dee7354fe6 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -364,6 +364,7 @@ void __init early_setup(unsigned long dt_ptr) */ initialise_paca(&boot_paca, 0); fixup_boot_paca(&boot_paca); + WARN_ON(local_paca != 0); setup_paca(&boot_paca); /* install the paca into registers */ /* -------- printk is now safe to use ------- */ |