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Message-Id: <201310111256.r9BCuepM006243@localhost.localdomain> Date: Fri, 11 Oct 2013 14:56:40 +0200 From: Christophe Leroy <christophe.leroy@....fr> To: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org> CC: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org Subject: [PATCH] powerpc 8xx: Fixing memory init issue with CONFIG_PIN_TLB 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@....fr> diff -ur linux-3.11.org/arch/powerpc/kernel/head_8xx.S linux-3.11/arch/powerpc/kernel/head_8xx.S --- linux-3.11.org/arch/powerpc/mm/init_32.c 2013-09-02 22:46:10.000000000 +0200 +++ linux-3.11/arch/powerpc/mm/init_32.c 2013-09-09 11:28:54.000000000 +0200 @@ -213,7 +213,12 @@ */ 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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