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powerpc/8xx: Fixing memory init issue with CONFIG_PIN_TLB

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Activating CONFIG_PIN_TLB allows access to the 24 first Mbytes of
memory at bootup instead of 8.  It is needed for "big" kernels for
instance when activating CONFIG_LOCKDEP_SUPPORT.  This needs to be
taken into account in init_32 too, otherwise memory allocation soon
fails after startup.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
LEROY Christophe 2013-10-11 14:56:40 +02:00 committed by Scott Wood
parent 4e591f3c0a
commit 5f2da0f1e8
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/mm/init_32.c
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@ -213,7 +213,12 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
*/
BUG_ON(first_memblock_base != 0);
#ifdef CONFIG_PIN_TLB
/* 8xx can only access 24MB at the moment */
memblock_set_current_limit(min_t(u64, first_memblock_size, 0x01800000));
#else
/* 8xx can only access 8MB at the moment */
memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000));
#endif
}
#endif /* CONFIG_8xx */