On 07/24/2013 10:00 PM, James Bottomley wrote: > > On Wed, 2013-07-24 at 16:12 +0800, Chen Gang wrote: >> For server, 64-bit kernel is widely used and '64BIT' have been already >> as the default option of a server. >> >> So better to use 64-bit kernel as default choise instead of 32-bit >> kernel. > > I think this is irrelevant since we have defconfig for this. You > apparent request doesn't match the code below. > Hmm... but I still suggest when use 'allmodconfig' let 64-bit as the default choice (normally 64-bit is the default choice for servers). >> Or when use cross-compiler 'hppa64-linux-gnu-gcc' with allmodconfig, it >> will report BUILD_BUG_ON: >> >> arch/parisc/mm/init.c: In function ‘mem_init’: >> arch/parisc/mm/init.c:581:2: error: call to ‘__compiletime_assert_581’ declared with attribute error: BUILD_BUG_ON failed: PTE_ENTRY_SIZE != sizeof(pte_t) > > This shows you're using a buggy compiler. PTE_OFFSET_SIZE is generated > as part of the build process, so you need a correct compiler. > Hmm... It means the compiler assumes to build 64-bit code (hppa64), but our configuration is for 32-bit, they are mismatch. Maybe we can say hppa64-linux-gnu-gcc can not build the 32-bit parisc code (although it is not precise), but at least, it is not a real bug. This contents wants to say: when use 'allmodconfig' for a server, we do not build a 64-bit server. >> Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx> >> --- >> arch/parisc/Kconfig | 2 +- >> 1 files changed, 1 insertions(+), 1 deletions(-) >> >> diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig >> index aa399a5..37bdecf 100644 >> --- a/arch/parisc/Kconfig >> +++ b/arch/parisc/Kconfig >> @@ -111,7 +111,7 @@ menu "Processor type and features" >> >> choice >> prompt "Processor type" >> - default PA7000 >> + default PA8X00 > > This doesn't require 64 bit: PA8xxx processors can operate happily in 32 > bit mode it does make the question appear, since PA7xxx are 32 bit only. > Yeah, 'PA8X00' can compitable with 32-bit, but it likes 64-bit, the following config files are for 'PA8X00': a500_defconfig: for 64-bit c3000_defconfig: for 32-bit c8000_defconfig: for 64-bit generic-64bit_defconfig: for 64-bit At least, we can say PA8xxx is a 64-bit processor for parisc, is it correct ? And for 'allmodconfig', if let 'PA8X00' as default choice, it will build 64-bit kernel. Thanks. -- Chen Gang -- Chen Gang -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
