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x86-32: Make sure we can map all of lowmem if we need to

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A relocatable kernel can be anywhere in lowmem -- and in the case of a
kdump kernel, is likely to be fairly high.  Since the early page
tables map everything from address zero up we need to make sure we
allocate enough brk that we can map all of lowmem if we need to.

Reported-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Tested-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4D0AD3ED.8070607@kernel.org>
This commit is contained in:
H. Peter Anvin
2010-12-16 19:11:09 -08:00
parent 7f99d946e7
commit 147dd5610c
2 changed files with 8 additions and 6 deletions
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2
arch/x86/boot/compressed/misc.c
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@@ -355,7 +355,7 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
if (heap > 0x3fffffffffffUL)
error("Destination address too large");
#else
if (heap > ((-__PAGE_OFFSET-(512<<20)-1) & 0x7fffffff))
if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
error("Destination address too large");
#endif
#ifndef CONFIG_RELOCATABLE