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For book3s/32 it is assumed that TASK_SIZE is a multiple of 256 Mbytes, but Kconfig allows any value for TASK_SIZE. In all relevant calculations, align TASK_SIZE to the upper 256 Mbytes boundary. Also use ASM_CONST() in the definition of TASK_SIZE to ensure it is seen as an unsigned constant. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/8928d906079e156c59794c41e826a684eaaaebb4.1766574657.git.chleroy@kernel.org