From 873553b3d6b3b19f187a5630300ece20bbf74afd Mon Sep 17 00:00:00 2001 From: Dale Farnsworth Date: Wed, 3 Oct 2007 12:01:40 -0700 Subject: [PATCH] [POWERPC] 85xx: Failure with odd memory sizes and CONFIG_HIGHMEM The CONFIG_FSL_BOOKE mmu setup code fails when CONFIG_HIGHMEM=y and the 3 fixed TLB entries cannot exactly map the lowmem size. Each TLB entry can map 4MB, 16MB, 64MB or 256MB, so the failure is observed when the kernel lowmem size is not equal to the sum of up to 3 of those values. Normally, memory is sized in nice numbers, but I observed this problem while testing a crash dump kernel. The failure can also be observed by artificially reducing the kernel's main memory via the mem= kernel command line parameter. This commit fixes the problem by setting __initial_memory_limit in adjust_total_lowmem(). Signed-off-by: Dale Farnsworth Signed-off-by: Kumar Gala --- arch/powerpc/mm/fsl_booke_mmu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c index afab247d472f..17139daeaff4 100644 --- a/arch/powerpc/mm/fsl_booke_mmu.c +++ b/arch/powerpc/mm/fsl_booke_mmu.c @@ -59,6 +59,7 @@ unsigned int num_tlbcam_entries; static unsigned long __cam0, __cam1, __cam2; extern unsigned long total_lowmem; extern unsigned long __max_low_memory; +extern unsigned long __initial_memory_limit; #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE #define NUM_TLBCAMS (16) @@ -232,4 +233,5 @@ adjust_total_lowmem(void) __cam0 >> 20, __cam1 >> 20, __cam2 >> 20, (total_lowmem - __cam0 - __cam1 - __cam2) >> 20); __max_low_memory = max_low_mem = __cam0 + __cam1 + __cam2; + __initial_memory_limit = __max_low_memory; } -- 2.30.2