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/frv/kernel/setup.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'arch/frv') diff --git a/arch/frv/kernel/setup.c b/arch/frv/kernel/setup.c index b38ae1fc15fd..6c01464db699 100644 --- a/arch/frv/kernel/setup.c +++ b/arch/frv/kernel/setup.c @@ -925,13 +925,15 @@ static void __init setup_linux_memory(void) #endif /* take back the memory occupied by the kernel image and the bootmem alloc map */ - reserve_bootmem(kstart, kend - kstart + bootmap_size); + reserve_bootmem(kstart, kend - kstart + bootmap_size, + BOOTMEM_DEFAULT); /* reserve the memory occupied by the initial ramdisk */ #ifdef CONFIG_BLK_DEV_INITRD if (LOADER_TYPE && INITRD_START) { if (INITRD_START + INITRD_SIZE <= (low_top_pfn << PAGE_SHIFT)) { - reserve_bootmem(INITRD_START, INITRD_SIZE); + reserve_bootmem(INITRD_START, INITRD_SIZE, + BOOTMEM_DEFAULT); initrd_start = INITRD_START + PAGE_OFFSET; initrd_end = initrd_start + INITRD_SIZE; } @@ -986,9 +988,10 @@ static void __init setup_uclinux_memory(void) /* now take back the bits the core kernel is occupying */ #ifndef CONFIG_PROTECT_KERNEL - reserve_bootmem(kend, bootmap_size); + reserve_bootmem(kend, bootmap_size, BOOTMEM_DEFAULT); reserve_bootmem((unsigned long) &__kernel_image_start, - kend - (unsigned long) &__kernel_image_start); + kend - (unsigned long) &__kernel_image_start, + BOOTMEM_DEFAULT); #else dampr = __get_DAMPR(0); @@ -996,14 +999,15 @@ static void __init setup_uclinux_memory(void) dampr = (dampr >> 4) + 17; dampr = 1 << dampr; - reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr); + reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr, BOOTMEM_DEFAULT); #endif /* reserve some memory to do uncached DMA through if requested */ #ifdef CONFIG_RESERVE_DMA_COHERENT if (dma_coherent_mem_start) reserve_bootmem(dma_coherent_mem_start, - dma_coherent_mem_end - dma_coherent_mem_start); + dma_coherent_mem_end - dma_coherent_mem_start, + BOOTMEM_DEFAULT); #endif } /* end setup_uclinux_memory() */ -- cgit v1.2.3