Re: Build error due to commit 458aa76d132dc ("mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range")
From: Aneesh Kumar K.V
Date: Tue Mar 22 2016 - 01:15:38 EST
Guenter Roeck <linux@xxxxxxxxxxxx> writes:
> [ text/plain ]
> Your commit 458aa76d132dc1 ("mm/thp/migration: switch from flush_tlb_range
> to flush_pmd_tlb_range") causes a build error when building
> include/asm-generic/pgtable.h:799:45: note: in expansion of macro âBUILD_BUGâ
> #define flush_pmd_tlb_range(vma, addr, end) BUILD_BUG()
> ./arch/arc/include/asm/tlbflush.h:37:13: note:
> in expansion of macro âflush_pmd_tlb_rangeâ
> The build triggers the newly introduced BUILD_BUG().
> When building the image without the BUILD_BUG(), ie with no definition
> of flush_pmd_tlb_range(), the problem is gone. This suggests that the
> function is not needed for this build.
> I could submit a patch to remove the BUILD_BUG(), but maybe you had a reason
> for introducing it. Can you elaborate why you introduced the BUILD_BUG() ?
Isn't this going to be fixed by an update to ARC tree ?
I also don't understand why we would hit that BUILD_BUG, if we are not