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powerpc/mm: Add addr_limit to mm_context and use it to derive max slice index

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In the followup patch, we will increase the slice array size to handle
512TB range, but will limit the max addr to 128TB. Avoid doing
unnecessary computation and avoid doing slice mask related operation
above address limit.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2017-03-22 09:06:58 +05:30
committed by Michael Ellerman
parent f6eedbba7a
commit 957b778a16
6 changed files with 32 additions and 11 deletions
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9
arch/powerpc/kernel/setup-common.c
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@ -920,6 +920,15 @@ void __init setup_arch(char **cmdline_p)
init_mm.end_code = (unsigned long) _etext;
init_mm.end_data = (unsigned long) _edata;
init_mm.brk = klimit;
#ifdef CONFIG_PPC_MM_SLICES
#ifdef CONFIG_PPC64
init_mm.context.addr_limit = TASK_SIZE_USER64;
#else
#error "context.addr_limit not initialized."
#endif
#endif
#ifdef CONFIG_PPC_64K_PAGES
init_mm.context.pte_frag = NULL;
#endif