From 72a7fe3967dbf86cb34e24fbf1d957fe24d2f246 Mon Sep 17 00:00:00 2001 From: Bernhard Walle Date: Thu, 7 Feb 2008 00:15:17 -0800 Subject: Introduce flags for reserve_bootmem() This patchset adds a flags variable to reserve_bootmem() and uses the BOOTMEM_EXCLUSIVE flag in crashkernel reservation code to detect collisions between crashkernel area and already used memory. This patch: Change the reserve_bootmem() function to accept a new flag BOOTMEM_EXCLUSIVE. If that flag is set, the function returns with -EBUSY if the memory already has been reserved in the past. This is to avoid conflicts. Because that code runs before SMP initialisation, there's no race condition inside reserve_bootmem_core(). [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix powerpc build] Signed-off-by: Bernhard Walle Cc: Cc: "Eric W. Biederman" Cc: Vivek Goyal Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/arm/mm/mmu.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) (limited to 'arch/arm/mm/mmu.c') diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index e5d61ee3d4a..d41a75ed3dc 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -605,9 +605,11 @@ void __init reserve_node_zero(pg_data_t *pgdat) * Note that this can only be in node 0. */ #ifdef CONFIG_XIP_KERNEL - reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); + reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start, + BOOTMEM_DEFAULT); #else - reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); + reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext, + BOOTMEM_DEFAULT); #endif /* @@ -615,7 +617,7 @@ void __init reserve_node_zero(pg_data_t *pgdat) * and can only be in node 0. */ reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), - PTRS_PER_PGD * sizeof(pgd_t)); + PTRS_PER_PGD * sizeof(pgd_t), BOOTMEM_DEFAULT); /* * Hmm... This should go elsewhere, but we really really need to @@ -638,8 +640,10 @@ void __init reserve_node_zero(pg_data_t *pgdat) /* H1940 and RX3715 need to reserve this for suspend */ if (machine_is_h1940() || machine_is_rx3715()) { - reserve_bootmem_node(pgdat, 0x30003000, 0x1000); - reserve_bootmem_node(pgdat, 0x30081000, 0x1000); + reserve_bootmem_node(pgdat, 0x30003000, 0x1000, + BOOTMEM_DEFAULT); + reserve_bootmem_node(pgdat, 0x30081000, 0x1000, + BOOTMEM_DEFAULT); } #ifdef CONFIG_SA1111 @@ -650,7 +654,8 @@ void __init reserve_node_zero(pg_data_t *pgdat) res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; #endif if (res_size) - reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); + reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size, + BOOTMEM_DEFAULT); } /* -- cgit v1.2.3