1. 21 11月, 2007 1 次提交
  2. 18 11月, 2007 2 次提交
  3. 17 11月, 2007 1 次提交
  4. 18 11月, 2007 1 次提交
  5. 17 11月, 2007 1 次提交
    • M
      Blackfin arch: Add assembly function insl_16 · 5c91fb90
      Michael Hennerich 提交于
      /*
       * CPUs often take a performance hit when accessing unaligned memory
       * locations. The actual performance hit varies, it can be small if the
       * hardware handles it or large if we have to take an exception and fix
       * it
       * in software.
       *
       * Since an ethernet header is 14 bytes network drivers often end up
       * with
       * the IP header at an unaligned offset. The IP header can be aligned by
       * shifting the start of the packet by 2 bytes. Drivers should do this
       * with:
       *
       * skb_reserve(NET_IP_ALIGN);
       *
       * The downside to this alignment of the IP header is that the DMA is
       * now
       * unaligned. On some architectures the cost of an unaligned DMA is high
       * and this cost outweighs the gains made by aligning the IP header.
       *
       * Since this trade off varies between architectures, we allow
       * NET_IP_ALIGN
       * to be overridden.
       */
      
      This new function insl_16 allows to read form 32-bit IO and writes to
      16-bit aligned memory. This is useful in above described scenario -
      In particular with the AXIS AX88180 Gigabit Ethernet MAC.
      Once the device is in 32-bit mode, reads from the RX FIFO always
      decrements 4bytes.
      While on the other side the destination address in SDRAM is always
      16-bit aligned.
      If we use skb_reserve(0) the receive buffer is 32-bit aligned but later
      we hit a unaligned exception in the IP code.
      Signed-off-by: NMichael Hennerich <michael.hennerich@analog.com>
      Signed-off-by: NBryan Wu <bryan.wu@analog.com>
      5c91fb90
  6. 23 11月, 2007 1 次提交
  7. 17 11月, 2007 2 次提交
  8. 18 11月, 2007 1 次提交
  9. 17 11月, 2007 1 次提交
  10. 15 11月, 2007 5 次提交
  11. 22 11月, 2007 1 次提交
  12. 15 11月, 2007 4 次提交
  13. 21 11月, 2007 1 次提交
  14. 23 11月, 2007 1 次提交
  15. 15 11月, 2007 6 次提交
  16. 13 11月, 2007 1 次提交
  17. 12 11月, 2007 3 次提交
  18. 18 11月, 2007 2 次提交
    • S
      x86: simplify "make ARCH=x86" and fix kconfig all.config · 6840999b
      Sam Ravnborg 提交于
      Simplify "make ARCH=x86" and fix kconfig so we again can set 64BIT in
      all.config.
      
      For a fix the diffstat is nice:
       6 files changed, 3 insertions(+), 36 deletions(-)
      
      The patch reverts these commits:
       - 0f855aa6 ("kconfig: add helper to set
         config symbol from environment variable")
       - 2a113281 ("kconfig: use $K64BIT to
         set 64BIT with all*config targets")
      
      Roman Zippel pointed out that kconfig supported string compares so
      the additional complexity introduced by the above two patches were
      not needed.
      
      With this patch we have following behaviour:
      
        # make {allno,allyes,allmod,rand}config [ARCH=...]
        option \ host arch      | 32bit         | 64bit
        =====================================================
        ./.                     | 32bit         | 64bit
        ARCH=x86                | 32bit         | 32bit
        ARCH=i386               | 32bit         | 32bit
        ARCH=x86_64             | 64bit         | 64bit
      
      The general rule are that ARCH= and native architecture takes
      precedence over the configuration.
      
      So make ARCH=i386 [whatever] will always build a 32-bit kernel
      no matter what the configuration says.  The configuration will
      be updated to 32-bit if it was configured to 64-bit and the
      other way around.
      
      This behaviour is consistent with previous behaviour so no
      suprises here.
      
      make ARCH=x86 will per default result in a 32-bit kernel but as
      the only ARCH= value x86 allow the user to select between 32-bit
      and 64-bit using menuconfig.
      Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Andreas Herrmann <aherrman@arcor.de>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      6840999b
    • S
      x86: simplify "make ARCH=x86" and fix kconfig all.config · 80ef88d6
      Sam Ravnborg 提交于
      Simplify "make ARCH=x86" and fix kconfig so we again
      can set 64BIT in all.config.
      
      For a fix the diffstat is nice:
       6 files changed, 3 insertions(+), 36 deletions(-)
      
      The patch reverts these commits:
      0f855aa6
      -> kconfig: add helper to set config symbol from environment variable
      
      2a113281
      -> kconfig: use $K64BIT to set 64BIT with all*config targets
      
      Roman Zippel pointed out that kconfig supported string
      compares so the additional complexity introduced by the
      above two patches were not needed.
      
      With this patch we have following behaviour:
      
      # make {allno,allyes,allmod,rand}config [ARCH=...]
      option \ host arch      | 32bit         | 64bit
      =====================================================
      ./.                     | 32bit         | 64bit
      ARCH=x86                | 32bit         | 32bit
      ARCH=i386               | 32bit         | 32bit
      ARCH=x86_64             | 64bit         | 64bit
      
      The general rule are that ARCH= and native architecture
      takes precedence over the configuration.
      So make ARCH=i386 [whatever] will always build a 32-bit
      kernel no matter what the configuration says.
      The configuration will be updated to 32-bit if it was
      configured to 64-bit and the other way around.
      
      This behaviour is consistent with previous behaviour so
      no suprises here.
      
      make ARCH=x86 will per default result in a 32-bit kernel
      but as the only ARCH= value x86 allow the user to select
      between 32-bit and 64-bit using menuconfig. 
      Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Andreas Herrmann <aherrman@arcor.de>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      80ef88d6
  19. 17 11月, 2007 5 次提交