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Message-ID: <bb057cd21003181038j56992f68p6d72d0058d72f82f@mail.gmail.com> Date: Thu, 18 Mar 2010 10:38:44 -0700 From: Yang <teddyyyy123@...il.com> To: linux-kernel@...r.kernel.org Subject: should we use $(__USER_DS) or $(__KERNEL_DS) when entering interrupt handlers? in handling an interrupt, kernel first saves all the register contents , in the SAVE_ALL macro, in the last part of this macro, it adjusts the data segment selectors for kernel mode. in kernel 2.4, the __KERNEL_DS segment is loaded into %ds and %es, at line 98 of: http://lxr.linux.no/#linux-old+v2.4.31/arch/i386/kernel/entry.S but in kernel 2.6, __USER_DS segment is loaded into %ds and %es, at line 227 of : http://lxr.linux.no/#linux+v2.6.33/arch/x86/kernel/entry_32.S I understand that on x86, all the data segment selector contents are basically the same, but semantically it's better to use the KERNEL_DS because we are working in kernel mode? Thanks! Yang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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