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f20c1dbe82
The API for apm_get_power_status is "call it if it isn't NULL",
except it's also initialised with a no-op __apm_get_power_status.
This was added alongside apm_get_power_status in 2007.
The apm_get_power_status symbol is used in these files:
arch/arm/mach-pxa/sharpsl_pm.c:extern void (*apm_get_power_status)(struct apm_power_info *);
arch/arm/mach-pxa/sharpsl_pm.c: apm_get_power_status = sharpsl_apm_get_power_status;
arch/sh/boards/mach-hp6xx/hp6xx_apm.c: apm_get_power_status = hp6x0_apm_get_power_status;
drivers/char/apm-emulation.c:void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status;
drivers/char/apm-emulation.c:EXPORT_SYMBOL(apm_get_power_status);
drivers/char/apm-emulation.c: if (apm_get_power_status)
drivers/char/apm-emulation.c: apm_get_power_status(&info);
drivers/macintosh/apm_emu.c: apm_get_power_status = pmu_apm_get_power_status;
drivers/macintosh/apm_emu.c: if (apm_get_power_status == pmu_apm_get_power_status)
drivers/macintosh/apm_emu.c: apm_get_power_status = NULL;
drivers/power/supply/apm_power.c: apm_get_power_status = apm_battery_apm_get_power_status;
drivers/power/supply/apm_power.c: apm_get_power_status = NULL;
include/linux/apm-emulation.h:extern void (*apm_get_power_status)(struct apm_power_info *);
All of them are compatible with the API (post-remove UAFs notwithstanding)
and don't even read it except to compare with their own values;
on a cursory glance this doesn't seem to have ever not been the case.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.