• Bernhard Walle's avatar
    Introduce flags for reserve_bootmem() · 72a7fe39
    Bernhard Walle authored
    
    
    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: default avatarBernhard Walle <bwalle@suse.de>
    Cc: <linux-arch@vger.kernel.org>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Vivek Goyal <vgoyal@in.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    72a7fe39