From a5c492695b7967201f0988007e3bd8096b468049 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Mon, 10 May 2010 18:59:18 +0000 Subject: [PATCH] powerpc: Use more accurate limit for first segment memory allocations commit 095c7965f4dc870ed2b65143b1e2610de653416c upstream. Author: Milton Miller On large machines we are running out of room below 256MB. In some cases we only need to ensure the allocation is in the first segment, which may be 256MB or 1TB. Add slb0_limit and use it to specify the upper limit for the irqstack and emergency stacks. On a large ppc64 box, this fixes a panic at boot when the crashkernel= option is specified (previously we would run out of memory below 256MB). Signed-off-by: Milton Miller Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt Cc: Kamalesh Babulal Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kernel/setup_64.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 8b25f51f03bf..fc09bebe68a5 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -451,9 +451,18 @@ void __init setup_system(void) DBG(" <- setup_system()\n"); } +static u64 slb0_limit(void) +{ + if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) { + return 1UL << SID_SHIFT_1T; + } + return 1UL << SID_SHIFT; +} + #ifdef CONFIG_IRQSTACKS static void __init irqstack_early_init(void) { + u64 limit = slb0_limit(); unsigned int i; /* @@ -463,10 +472,10 @@ static void __init irqstack_early_init(void) for_each_possible_cpu(i) { softirq_ctx[i] = (struct thread_info *) __va(lmb_alloc_base(THREAD_SIZE, - THREAD_SIZE, 0x10000000)); + THREAD_SIZE, limit)); hardirq_ctx[i] = (struct thread_info *) __va(lmb_alloc_base(THREAD_SIZE, - THREAD_SIZE, 0x10000000)); + THREAD_SIZE, limit)); } } #else @@ -479,7 +488,7 @@ static void __init irqstack_early_init(void) */ static void __init emergency_stack_init(void) { - unsigned long limit; + u64 limit; unsigned int i; /* @@ -491,7 +500,7 @@ static void __init emergency_stack_init(void) * bringup, we need to get at them in real mode. This means they * must also be within the RMO region. */ - limit = min(0x10000000UL, lmb.rmo_size); + limit = min(slb0_limit(), lmb.rmo_size); for_each_possible_cpu(i) { unsigned long sp; -- 2.39.2