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powerpc/powernv: Increase memory block size to 1GB on radix
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Memory hot unplug on PowerNV radix hosts is broken. Our memory block
size is 256MB but since we map the linear region with very large
pages, each pte we tear down maps 1GB.

A hot unplug of one 256MB memory block results in 768MB of memory
getting unintentionally unmapped. At this point we are likely to oops.

Fix this by increasing our memory block size to 1GB on PowerNV radix
hosts.

Fixes: 4b5d62c ("powerpc/mm: add radix__remove_section_mapping()")
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Anton Blanchard authored and Michael Ellerman committed Oct 6, 2017
1 parent 7c6a4f3 commit 53ecde0
Showing 1 changed file with 9 additions and 1 deletion.
10 changes: 9 additions & 1 deletion arch/powerpc/platforms/powernv/setup.c
Original file line number Diff line number Diff line change
Expand Up @@ -272,7 +272,15 @@ static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
static unsigned long pnv_memory_block_size(void)
{
return 256UL * 1024 * 1024;
/*
* We map the kernel linear region with 1GB large pages on radix. For
* memory hot unplug to work our memory block size must be at least
* this size.
*/
if (radix_enabled())
return 1UL * 1024 * 1024 * 1024;
else
return 256UL * 1024 * 1024;
}
#endif

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