forked from Minki/linux
77e02cf57b
The boot-time allocation interface for memblock is a mess, with
'memblock_alloc()' returning a virtual pointer, but then you are
supposed to free it with 'memblock_free()' that takes a _physical_
address.
Not only is that all kinds of strange and illogical, but it actually
causes bugs, when people then use it like a normal allocation function,
and it fails spectacularly on a NULL pointer:
https://lore.kernel.org/all/20210912140820.GD25450@xsang-OptiPlex-9020/
or just random memory corruption if the debug checks don't catch it:
https://lore.kernel.org/all/61ab2d0c-3313-aaab-514c-e15b7aa054a0@suse.cz/
I really don't want to apply patches that treat the symptoms, when the
fundamental cause is this horribly confusing interface.
I started out looking at just automating a sane replacement sequence,
but because of this mix or virtual and physical addresses, and because
people have used the "__pa()" macro that can take either a regular
kernel pointer, or just the raw "unsigned long" address, it's all quite
messy.
So this just introduces a new saner interface for freeing a virtual
address that was allocated using 'memblock_alloc()', and that was kept
as a regular kernel pointer. And then it converts a couple of users
that are obvious and easy to test, including the 'xbc_nodes' case in
lib/bootconfig.c that caused problems.
Reported-by: kernel test robot <oliver.sang@intel.com>
Fixes:
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|---|---|---|
| .. | ||
| ams | ||
| adb-iop.c | ||
| adb.c | ||
| adbhid.c | ||
| ans-lcd.c | ||
| ans-lcd.h | ||
| apm_emu.c | ||
| Kconfig | ||
| mac_hid.c | ||
| macio_asic.c | ||
| macio_sysfs.c | ||
| macio-adb.c | ||
| Makefile | ||
| mediabay.c | ||
| rack-meter.c | ||
| smu.c | ||
| therm_adt746x.c | ||
| therm_windtunnel.c | ||
| via-cuda.c | ||
| via-macii.c | ||
| via-pmu-backlight.c | ||
| via-pmu-event.c | ||
| via-pmu-event.h | ||
| via-pmu-led.c | ||
| via-pmu.c | ||
| windfarm_ad7417_sensor.c | ||
| windfarm_core.c | ||
| windfarm_cpufreq_clamp.c | ||
| windfarm_fcu_controls.c | ||
| windfarm_lm75_sensor.c | ||
| windfarm_lm87_sensor.c | ||
| windfarm_max6690_sensor.c | ||
| windfarm_mpu.h | ||
| windfarm_pid.c | ||
| windfarm_pid.h | ||
| windfarm_pm72.c | ||
| windfarm_pm81.c | ||
| windfarm_pm91.c | ||
| windfarm_pm112.c | ||
| windfarm_pm121.c | ||
| windfarm_rm31.c | ||
| windfarm_smu_controls.c | ||
| windfarm_smu_sat.c | ||
| windfarm_smu_sensors.c | ||
| windfarm.h | ||