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There is currently a hardcoded limit of 64KB for the DTB to live in and
be extended with ATAG info. Some DTBs have outgrown that limit:
$ du -b arch/arm/boot/dts/omap3-n900.dtb
70212 arch/arm/boot/dts/omap3-n900.dtb
Furthermore, the actual size passed to atags_to_fdt() included the stack
size which is obviously wrong.
The initial DTB size is known, so use it to size the allocated workspace
with a 50% growth assumption and relocate the temporary stack above that.
This is also clamped to 32KB min / 1MB max for robustness against bad
DTB data.
Reported-by: Pali Rohár <pali.rohar@gmail.com>
Tested-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
c2607f74aa