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| author | Noam Camus <noamc@ezchip.com> | 2014-09-07 21:52:33 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-05-09 06:02:32 +0200 |
| commit | 15ca68a993d10767c37793e6a0a780b0a7e395dd (patch) | |
| tree | 42d9bb23a922629405b2ad49bb1304f421f31ab0 /arch/arc/mm/tlb.c | |
| parent | ARC: clean out UAPI byteorder.h clean off Kconfig symbol (diff) | |
| download | linux-15ca68a993d10767c37793e6a0a780b0a7e395dd.tar.xz linux-15ca68a993d10767c37793e6a0a780b0a7e395dd.zip | |
ARC: Make vmalloc size configurable
On ARC, lower 2G of address space is translated and used for
- user vaddr space (region 0 to 5)
- unused kernel-user gutter (region 6)
- kernel vaddr space (region 7)
where each region simply represents 256MB of address space.
The kernel vaddr space of 256MB is used to implement vmalloc, modules
So far this was enough, but not on EZChip system with 4K CPUs (given
that per cpu mechanism uses vmalloc for allocating chunks)
So allow VMALLOC_SIZE to be configurable by expanding down into the unused
kernel-user gutter region which at default 256M was excessive anyways.
Also use _BITUL() to fix a build error since PGDIR_SIZE cannot use "1UL"
as called from assembly code in mm/tlbex.S
Signed-off-by: Noam Camus <noamc@ezchip.com>
[vgupta: rewrote changelog, debugged bootup crash due to int vs. hex]
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm/tlb.c')
| -rw-r--r-- | arch/arc/mm/tlb.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c index 7046c12c58ed..745a9aeb2d96 100644 --- a/arch/arc/mm/tlb.c +++ b/arch/arc/mm/tlb.c @@ -814,6 +814,11 @@ void arc_mmu_init(void) printk(arc_mmu_mumbojumbo(0, str, sizeof(str))); + /* + * Can't be done in processor.h due to header include depenedencies + */ + BUILD_BUG_ON(!IS_ALIGNED((CONFIG_ARC_KVADDR_SIZE << 20), PMD_SIZE)); + /* For efficiency sake, kernel is compile time built for a MMU ver * This must match the hardware it is running on. * Linux built for MMU V2, if run on MMU V1 will break down because V1 |