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    • D
      [ARM] 2853/1: Make alloc_init_supersection() work with 36-bit mappings · 083bc6b3
      Deepak Saxena 提交于
      Patch from Deepak Saxena
      
      Working on adding support for 36-bit static mappings for ARMv6 and
      Intel's XSC3 core and noticed that alloc_init_supersection currently
      increments the phys addr by 1MB on each of the 16 iterations and then
      forces alignment to supersection size (16MB).  This is really uneeded
      b/c we have already forced the phys address to be 16MB aligned in
      create_mapping(). Furthermore, this breaks 36-bit addressing b/c bits
      [23:20] of the PMD contain bits [35:32] of the physical address and
      the masking causes us to loose those bits thus ending up with an
      incorrect virt -> phys translation.  The other option is to have an
      alloc_init_supersection36.
      Tested on Intel IXP2350 CPU with 36-bit static I/O mappings.
      Signed-off-by: NDeepak Saxena <dsaxena@plexity.net>
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      083bc6b3