On 03/17/2015 05:43 PM, tip-bot for Ingo Molnar wrote: > Commit-ID: c38e503804b0402c510f82437069f7769fa0cea9 > Gitweb: http://git.kernel.org/tip/c38e503804b0402c510f82437069f7769fa0cea9 > Author: Ingo Molnar <[email protected]> > AuthorDate: Tue, 17 Mar 2015 14:42:59 +0100 > Committer: Ingo Molnar <[email protected]> > CommitDate: Tue, 17 Mar 2015 16:01:42 +0100 > > x86/asm/entry/64: Rename 'old_rsp' to 'rsp_scratch' > > Make clear that the usage of PER_CPU(old_rsp) is purely temporary, > by renaming it to 'rsp_scratch'. ... > @@ -657,7 +657,7 @@ common_interrupt: > ASM_CLAC > addq $-0x80,(%rsp) /* Adjust vector to [-256,-1] range */ > interrupt do_IRQ > - /* 0(%rsp): old_rsp */ > + /* 0(%rsp): rsp_scratch */ > ret_from_intr:
Here the "old_rsp" word in comment did not refer to old_rsp variable. Rather, it literally means "old %rsp register value (before we possibly switched to per-CPU interrupt stack)". The stack switch is hidden in "interrupt do_IRQ" macro invocation. I think here "old_rsp" needs to be replaced by "old rsp" or "old %rsp". -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
