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Roland Dreier a880e76233 powerpc: Avoid integer overflow in page_is_ram() ... Commit 8b150478 ("ppc: make phys_mem_access_prot() work with pfns instead of addresses") fixed page_is_ram() in arch/ppc to avoid overflow for addresses above 4G on 32-bit kernels. However arch/powerpc's page_is_ram() is missing the same fix -- it computes a physical address by doing pfn << PAGE_SHIFT, which overflows if pfn corresponds to a page above 4G. In particular this causes pages above 4G to be mapped with the wrong caching attribute; for example many ppc440-based SoCs have PCI space above 4G, and mmap()ing MMIO space may end up with a mapping that has caching enabled. Fix this by working with the pfn and avoiding the conversion to physical address that causes the overflow. This patch compares the pfn to max_pfn, which is a semantic change from the old code -- that code compared the physical address to high_memory, which corresponds to max_low_pfn. However, I think that was is another bug, since highmem pages are still RAM. Reported-by: vb <vb@vsbe.com> Signed-off-by: Roland Dreier <rolandd@cisco.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>		17 years ago
..
boot	Merge commit 'jwb/jwb-next'	17 years ago
configs	Merge commit 'jwb/jwb-next'	17 years ago
include/asm	Merge commit 'jwb/jwb-next'	17 years ago
kernel	powerpc: Ignore generated vmlinux.lds in git	17 years ago
kvm	KVM: ppc: fix invalidation of large guest pages	17 years ago
lib	powerpc: New copy_4K_page()	17 years ago
math-emu	powerpc/math-emu: Use kernel generic math-emu code	17 years ago
mm	powerpc: Avoid integer overflow in page_is_ram()	17 years ago
oprofile	powerpc: Expose PMCs & cache topology in sysfs on 32-bit	17 years ago
platforms	Merge commit 'jwb/jwb-next'	17 years ago
sysdev	Merge commit 'jwb/jwb-next'	17 years ago
xmon	Merge branch 'linux-2.6'	17 years ago
Kconfig	powerpc: Make the 64-bit kernel as a position-independent executable	17 years ago
Kconfig.debug	powerpc: Split-out common MSI bitmap logic into msi_bitmap.c	17 years ago
Makefile	powerpc: Enforce a non-spe kernel build even on broken compilers	17 years ago